bluuebunny/crossref_metadata_2025 huggingface dataset:
Mutagenic activity of airborne particulate matter from the urban area of Porto Alegre, Brazil
Authors: Vargas Vera Maria Ferrão , Horn Rubem Cesar , Guidobono Régis Rolim , Mittelstaedt Ana Beatriz , Azevedo Irascema Girardi de
Published: December 2006

The mutagenic activity of airborne particulate matter collected from three different sites within the urban area of Porto Alegre, Brazil, was investigated using a Salmonella/microsome assay. Samples were extracted by sonication, sequentially, with cyclohexane (CX), and dichloromethane (DCM), for a rough fractionation by polarity. The different fractions were tested for mutagenicity using Salmonella typhimurium strains TA98, with and without metabolic activation (S9 mix fraction), and TA98NR and TA98/1,8-DNP6, without metabolic activation. Mutagenic response was observed for frameshift strain TA98 in assays with and without metabolization for two sites (sites 2 and 3), which had considerable risk of environmental contamination by nonpolar (CX) and/or moderately polar (DCM) compounds. However, the values of revertants/m3 (rev/m3) were highest on the site subject to automobile exhaust (site 3) in assays without (9.56 rev/m3) and with metabolization (5.08 rev/m3). Maximum mutagenic activity was detected in the moderately polar fraction, decreasing after metabolization. Nevertheless, the nonpolar fractions (CX) gave higher mutagenic activity in the presence of metabolization than in the absence of the S9 mix fraction. The responses observed for TA98NR and TA98/1,8-DNP6 strains suggest the activity of nitrocompounds.
Cytogenetic study of women with premature ovarian failure
Authors: Pagni Denise , Melaragno Maria Isabel
Published: December 2006

Etiology of premature ovarian failure (POF) is unclear in most patients. Since some cases are related to X-chromosome abnormalities, cytogenetical studies were conducted in patients with POF. Lymphocyte cultures from eleven patients were compared to cultures from age-matched controls. All individuals presented normal karyotypes. Frequencies of aneuploid and structural chromosome aberrations did not differ between the groups. The X chromosome was more frequently involved in aneuploidy and in premature centromere division in both groups.
Influência do aparelho propulsor Twin Block no crescimento mandibular: revisão sistemática da literatura
Authors: Olibone Vivian Lys L. , Guimarães Antônio Sérgio , Atta Joao Yates
Published: December 2006

OBJETIVO: avaliar a eficácia do aparelho ortopédico propulsor mandibular Twin Block quanto ao crescimento mandibular. METODOLOGIA: revisão sistemática da literatura a partir de 1970. RESULTADOS E CONCLUSÕES: a maioria dos autores afirmou que houve uma diminuição significativa do ângulo SNA com retroinclinação dos incisivos superiores, o ângulo SNB sofreu aumento com vestibularização dos incisivos inferiores, houve uma resposta tissular positiva nas estruturas da ATM durante o uso do propulsor. As alterações que ocorreram são uma combinação de modificações do côndilo, da fossa mandibular, do osso basal, além de alterações alvéolo-dentárias. Cada modificação estrutural dependeu de uma multiplicidade de fatores em cada indivíduo, como o padrão morfogenético, a idade, o gênero, o padrão funcional, o controle do aparelho e os hábitos orofaciais, entre outros.
Avaliação da prevalência das seis chaves de oclusão de Andrews, em jovens brasileiros com oclusão normal natural
Authors: Maltagliati Liliana Ávila , Montes Luciana Andrade do Prado , Bastia Fernanda Marcondes Machado , Bommarito Silvana
Published: December 2006

OBJETIVOS: diante da larga utilização e difusão dos conceitos das seis chaves de oclusão de Andrews como instrumento de diagnóstico e planificação de tratamento, realizamos este trabalho com o objetivo de avaliar a prevalência destas características numa amostra de oclusão normal brasileira. METODOLOGIA: 61 modelos de estudo de indivíduos brasileiros, leucodermas e com oclusão normal natural foram estudados. Foi observada a freqüência com que as seis chaves foram encontradas em cada indivíduo, bem como quais as chaves de maior e menor freqüência. RESULTADOS E CONCLUSÕES: os resultados demonstraram que a grande maioria dos indivíduos apresentou de uma a três chaves de oclusão e nenhum dos modelos apresentou as seis chaves de oclusão. As características observadas com maior freqüência foram a presença da curva de Spee suave (100%), contatos interproximais justos (42,6%) e inclinações corretas (34,4%). A baixa prevalência de oclusões normais naturais na população, que preencham os requisitos propostos por Andrews, leva-nos a refletir sobre a busca desenfreada por padrões tão rígidos.
Desempenho cognitivo de pacientes com epilepsia do lobo temporal e epilepsia mioclônica juvenil: avaliação por meio da Escala WAIS-III
Authors: Noffs Maria Helena da Silva , Yazigi Latife , Pascalicchio Tatiana Frascareli , Caboclo Luís Otávio Sales Ferreira , Yacubian Elza Márcia Targas
Published: December 2006

OBJETIVOS: Comparar os resultados em uma prova cognitiva de pacientes com epilepsia com dois parâmetros: um fornecido pelas normas brasileiras e outro pelas norte-americanas, tendo em vista as diferenças culturais. MÉTODO: Quarenta e cinco pacientes adultos com diagnóstico de epilepsia foram submetidos à avaliação de nível intelectual por meio da Escala Wechsler de Inteligência, WAIS-III nos seguintes itens: Quociente de Inteligência Verbal (QI V), Quociente de Inteligência de Execução (QI E) e Quociente de Inteligência Total (QI T). As correções dos protocolos seguiram as normas brasileiras e as norte-americanas. RESULTADOS: Dos 45 pacientes, 30 tinham o diagnóstico de epilepsia do lobo temporal (ELT) por esclerose mesial temporal (EMT), 15 no hemisfério esquerdo e 15 no direito, e 15 de epilepsia mioclônica juvenil (EMJ). Em todos os 45 protocolos do WAIS-III os resultados de QI V, QI E e QI T foram maiores quando empregados os parâmetros brasileiros. Assim, 18 pacientes que alcançaram QI T nas faixas "Média" e "Média Inferior", segundo as normas brasileiras, obtiveram níveis inferiores quando corrigidos pelas normas norte-americanas, ou seja, o QI T destes mesmos pacientes caiu para as faixas "Limítrofe" e "Muito Rebaixado" respectivamente. Nos pacientes com ELT, as diferenças de pontos entre os QI V e QI E não foram concordantes quando cotejados por normas diferentes e em cinco deles o desempenho verbal foi maior do que o motor quando corrigidos pelas normas norte-americanas. Nos pacientes com EMJ, os valores do QI V e QI E foram maiores quando empregadas normas brasileiras. CONCLUSÃO: Os resultados da avaliação cognitiva pelo WAIS-III de pacientes com epilepsia mostram que a interpretação do nível intelectual é muito distinta quando corrigida segundo normas brasileiras ou norte-americanas. Há também diferença na análise qualitativa do desempenho intelectual, uma vez que o estudo das discrepâncias internas variou conforme a norma populacional utilizada.
Epilepsia do lobo temporal mesial associada à esclerose hipocampal
Authors: Andrade-Valença Luciana P. A. , Valença Marcelo Moraes , Velasco Tonicarlo Rodrigues , Leite João Pereira
Published: December 2006

INTRODUÇÃO: A importância clínica da epilepsia do lobo temporal mesial (ELTM) decorre de sua alta prevalência e elevada proporção de pacientes com crises epilépticas refratárias ao tratamento medicamentos; sendo a esclerose mesial a etiologia encontrada em 50-70% dos pacientes com ELTM refratária ao tratamento clínico. OBJETIVO: Revisão, atualização e discussão dos aspectos clínicos, de histologia e fisiopatogenia da ELTM associada à esclerose hipocampal. RESULTADOS: Apesar da relação entre esclerose hippocampal e ELTM já estar bem estabelecida na literatura, o mecanismo exato pelo qual a esclerose hipocampal participa da gênese das crises epilépticas ainda não foi completamente desvendado. CONCLUSÕES: Estudos retrospectivos de centros de cirurgia de epilepsia enfatizam a associação entre esclerose hipocampal e história de injúria precipitante inicial, tais como crises epilépticas, ocorrendo em fase precoce do desenvolvimento cerebral. Apenas recentemente fatores genéticos foram implicados na gênese da esclerose hipocampal.
Clinical features of Psychogenic Nonepileptic Seizures (PNES): analysis of a Brazilian series
Authors: De Paola Luciano , Silvado Carlos , Mäder Maria Joana , Minhoto Gisele R. , Werneck Lineu C.
Published: December 2006

RATIONALE: An estimate of 3 million people present with the diagnosis of epilepsy in Brazil. Psychogenic Nonepileptic Seizures (PNES) are likely to occur in up to 2-33/100.000 people. Paradoxically, very few papers address this significant condition in the Brazilian literature. We describe a Brazilian PNES population and provide a review of the literature. METHODS: we reviewed the clinical history, vídeo-electroencephalographic (VEEG) data, psychiatric diagnosis and prognosis in a series of 45 PNES patients, with emphasis on the demographics, as well as, PNES major clinical presentations and classification. RESULTS: PNES represent 5.2% of the patients referred to the VEEG monitoring at our institution; patients were mostly young with a mean age of 27y/o and a clear predominance of the female gender (78%); the majority of PNES last between 1-5 minutes, but duration was highly variable; 28/45 patients were referred due to "intractable epilepsy" and 14/28 had MR defined mesial temporal sclerosis; about a third of the patients present with the classically described PNES clinical presentation; conversive and dissociative seizures prevail on PNES classification (80%). CONCLUSIONS: clinical and VEEG data on this Brazilian population matches descriptions coming from other series, suggesting potential cross-cultural similarities in the clinical expression of this condition.
Tradução e adaptação cultural da Seizure Severity Questionnaire: resultados preliminares
Authors: Silva Tatiana Indelicato da , Alonso Neide Barreira , Azevedo Auro Mauro , Westphal-Guitti Ana Carolina , Migliorini Rosa Cristina Vaz Pedroso , Marques Carolina Mattos , Caboclo Luís Otavio Sales Ferreira , Sakamoto Américo Ceiki , Yacubian Elza Márcia Targas
Published: December 2006

INTRODUÇÃO: O tratamento medicamentoso tem como meta principal a redução da freqüência de crises ou seu controle completo. No Brasil não dispomos de informação sobre tradução, adaptação cultural e validação de escalas que medem a gravidade de crises. OBJETIVO: Tradução e adaptação cultural da Escala de Gravidade de Crises (EGC) (Seizure Severity Questionnaire) com objetivo de avaliar o impacto da freqüência de crises. CASUÍSTICA E METODOLOGIA: A autora da escala concedeu a versão original em inglês para a tradução. Dois professores de inglês nativos realizaram a retrotradução. As versões em português e a retrotraduzida foram comparadas à original e após consenso foi obtida a versão final. Trinta pacientes em tratamento regular com diagnóstico de epilepsia do lobo temporal relacionada a esclerose mesial temporal responderam ao questionário. RESULTADOS: Vinte e dois pacientes (73%) eram do sexo masculino, com média de idade de 37 anos. Na Escala de Gravidade de Crises, 10 (33%) tiveram apenas auras; 18 (62%) apresentaram Movimentos ou atitudes durante a crise. Dois (6%) apresentaram Perda dos sentidos, 13 (43%) revelaram demora na recuperação após a crise com Efeitos mentais e corpóreos e 12 (40%) tiveram Efeitos emocionais. Vinte e oito (94%) responderam terem sido as crises extremamente graves e para 23 (77%) a recuperação após as crises foi o que mais incomodou. Observou-se uma correlação estatisticamente significante entre a freqüência de crises e os domínios do Nottingham Health Profile: Reações Emocionais (p = 0,046), Dor (p = 0,015) e Alterações do sono (p = 0,003). CONCLUSÃO: Foi realizada a adaptação cultural da EGC, avaliando seus resultados preliminares, e a relação entre freqüência de crises e QV. O impacto das crises tradicionalmente estudado em termos da freqüência e tipo de evento pode ser melhor compreendido se analisado sob a ótica do paciente.
Microscopic analysis of dog dental pulp after pulpotomy and pulp protection with mineral trioxide aggregate and white Portland cement
Authors: Menezes Renato , Bramante Clóvis Monteiro , Garcia Roberto Brandão , Letra Ariadne , Carvalho Vanessa Graciela Gomes , Carneiro Everdan , Brunini Sérgio , Oliveira Rodrigo Cardoso , Canova Giovana Calichio , Moraes Fernanda Gomes de
Published: December 2006

Considering previous studies on the similarity between the chemical composition of the mineral trioxide aggregate and the Portland cement, the purpose of this study was to investigate the pulp response of dog's teeth after pulpotomy and direct pulp protection with MTA Angelus and white Portland cement. Thirty eight pulp remnants were protected with these materials. One hundred and twenty days after treatment, the animals were sacrificed and the specimens removed and prepared for histological analysis. Both materials demonstrated the same results when used as pulp capping materials, inducing hard tissue bridge formation and maintaining pulp vitality in all specimens. The MTA Angelus and the white Portland cement showed to be effective as pulp protection materials following pulpotomy.
Effect of a metal primer on the bond strength of the resin-metal interface
Authors: Freitas Anderson Pinheiro de , Francisconi Paulo Afonso Silveira
Published: December 2006

To evaluate the effect of different surface treatments on shear bond strength between a metallic alloy (Co-Cr-Mo - Remanium CD) and a resin cement (Rely X TM) and to evaluate the mode of fracture after testing, forty couples of metallic-alloy disks were melted, regularized, polished, submitted to four thermal cycles (Vacuum, 960ºC, 8 minutes) and randomly separated into four groups. Each group received a different type of treatment: Group PSP: Polished with sandpaper 600; Group PCP: Polished with sandpaper 600 and application of the metal primer Alloy Primer (Kuraray); Group JSP: Sandblasted with 100µm aluminum oxide; Group JCP: Sandblasted with 100mm aluminum oxide and treated with a metal Primer. The groups were cemented and stored in distilled water at 37ºC for 36 hours and submitted to the shear bond strength test. The mean and standard deviation (in Kgf/cm²) obtained for each group was: PSP 4.0/0.4; PCP 88.9/33.6; JSP 163.2/27.6; JCP 144.5/54.0. After the statistical analysis the authors concluded that: the highest values were obtained for the sandblasted groups (JSP, JCP), regardless of the primer application; the Alloy Primer increased the retention between the Rely X cement and the polished surface of the Co-Cr-Mo alloy, yet its bond strength was not greater than that obtained with sandblasting; all specimens showed adhesive failures in the tested interface.
Clinical evaluation of the effects of low-intensity laser (GaAlAs) on wound healing after gingivoplasty in humans
Authors: Damante Carla Andreotti , Greghi Sebastião Luiz Aguiar , Sant'Ana Adriana Campos Passanezi , Passanezi Euloir
Published: December 2006

Low-intensity laser therapy aims at pain suppression, edema reduction and acceleration of wound healing. The main goal of this study was to clinically evaluate the effects of Aluminum Gallium Arsenate laser - 670nm in wound healing after gingivoplasty in 11 patients. Surgery was performed in anterior superior and/or inferior regions. The right side of the patient (test group) received a laser energy density of 4J/cm², in a 48-hour interval, during one week, totalizing four sessions. The irradiation was punctual in a contact mode in three points. The left side did not receive irradiation (control group). Clinical evaluation was performed by five specialists in periodontology through photography of the treated areas at post-surgical periods of 7, 15, 21,30,60 days. The observers pointed the best healed side. The Sign test was used for statistical analysis with a confidence level of 5% (P<0.05). The examiners found a better pattern of healing sometimes in the test and sometimes in the control group until 21 days after surgery. After this period there was no apparent difference between them. There was no statistical difference between the sides (p>0.05). These results have shown that low-intensity laser therapy did not accelerate oral mucosa healing after gingivoplasty.
Effects of desensitizing agents on dentinal tubule occlusion
Authors: Arrais César Augusto Galvão , Chan Daniel Chi Ngai , Giannini Marcelo
Published: December 2006

The aim of this study was to evaluate the features of dentinal tubules occlusion following application of three commercially available desensitizing agents: potassium oxalate-based / Oxa-Gel (OX), HEMA and glutaraldehyde-based / Gluma Desensitizer (GD) and acidulated phosphate fluoride-based / Nupro Gel (AF). Buccal cervical areas of twenty-four extracted human third molars were smoothed and wet-polished with SiC papers and diamond pastes, in order to simulate the clinical aspect of hypersensitive dentin cervical surfaces. The teeth were randomly divided into four groups (n=6), according to the dentin surface treatments: G1: untreated; G2: OX; G3: GD; G4: AF. Specimens were fractured in the lingual-buccal direction and prepared for SEM analysis. OX promoted tubule occlusion by crystal-like deposits in the lumen of the tubules. While GL created a thin layer over the dentin surface, AF application produced precipitates that occluded the tubules. According to the SEM analysis, all desensitizing agents were able to occlude the dentinal tubules.
Pediatric dentistry during rooming-in care: evaluation of an innovative project for promoting oral health
Authors: Rezende Giovanna Pires da Silva Ribeiro de , Costa Luciane Ribeiro de Rezende Sucasas da , Cardoso Regina Aparecida
Published: December 2006

According to the current paradigm for promoting health, dental care should be a consideration from the first months of life, or even before birth. The aim of this paper is to evaluate mothers' knowledge of and attitude toward their babies' oral health after receiving guidance during the neonatal period. Forty-six mothers were contacted and asked about the advice they had received and how they felt about the information provided. The mothers recruited for the study were divided into two groups, A (n=25) and B (n=21), according to the time elapsed since their participation in the project, that is, less than or equal to three months and more than three months, respectively. A Wilcoxom rank sum test did not show any statistically significant difference between the two groups (p>0.05). Guidance on the baby's oral hygiene, breastfeeding the baby exclusively until the sixth month, as well as the restrictions imposed on sugar intake were what the mothers remembered most. Recommendations concerning good arch development and the use of bottles were what mothers remembered least. Regarding infant oral health, it would be advisable to schedule prenatal and neonatal visits, with the second post-natal consultation no later than four months after childbirth.
Influence of orthopedic treatment on hard and soft facial structures of individuals presenting with Class II, Division 1 malocclusion: a comparative study
Authors: Maltagliati Liliana Ávila , Henriques José Fernando Castanha , Janson Guilherme , Almeida Renato Rodrigues de , Freitas Marcos Roberto de
Published: December 2006

The purpose of this investigation was to comparatively evaluate the cephalometric changes in soft and hard tissues related to treatment of Class II, division 1 malocclusion with activator-headgear and Bionator appliances. Twenty-four individuals formed the activator-headgear group and twenty-five comprised the Bionator group, while other twenty-four presenting the same malocclusion did not receive any intervention and served as controls. Lateral headfilms were taken at the beginning and at the end of the observation period and were digitized with computerized cephalometrics; cephalometric analysis was performed and the results were submitted to statistical test. According to the methodology employed, our findings suggested that both appliances do not significantly alter the growth path, and also they were not able to modify the posterior inferior height and the sagittal and vertical position of the upper lip. The lower lip and the soft menton were only slightly modified by the orthopedic appliances, but the mentolabial sulcus showed a significant decrease in deepness compared to the control group. Of statistical significance, only the anterior inferior hard and soft facial heights and the lower lip height increased more in the treated groups.
Perceptions of dentists, dentistry undergraduate students, and the lay public about dental sedation
Authors: Costa Luciane Ribeiro de Rezende Sucasas da , Dias Andréia Diniz , Pinheiro Luciana Silva , Chaves Maria Edwiges Pinheiro de Souza , Ferreira Raíssa de Aquino Rodrigues , Almeida Roberta Barros de , Lima Alessandra Rodrigues de Almeida
Published: December 2006

Sedation is an option for controlling fear and anxiety related to a visit to the dentist. The goal of this study was to capture, by means of a questionnaire, the perceptions of twenty dentists, twenty dental students and twenty lay people concerning the use of sedatives in a dental environment. The responses were evaluated using the quantitative-interpretative method. Dentists: 75% had knowledge of sedatives in a dental setting, but their actual use was mentioned by only three. As far as the use of sedatives by dentists is concerned, one considered it "risky" and 19 were favorable. Two affirmed that sedation does not present risks. Eighteen said they would be able to react to a medical emergency. Dental students: 60% said they were aware of the topic, in theory. Nineteen expressed interest in the topic. Fifteen claimed there were risks associated with the technique. Twelve (60%) have the theoretical knowledge to deal with a medical emergency in the dental office. Lay public: Seven (35%) responded that they felt some discomfort during dental treatment, because of fear (n=6) and equipment noise (n=2). Five said they would go to the dentist more often if there was a way to reduce the discomfort. Half of those interviewed indicated that they knew what sedation was. Sixteen favored using it for dental treatment. Seven thought that there were no risks when sedation is carried out. It was concluded that few participants in any of the three categories felt confident about the topic, though they demonstrated interest. The population in general felt optimistic, while practicing dentists and dental students complained of a lack of exposure to the subject at dental school.
Effect of saliva contamination and re-etching time on the shear bond strength of a pit and fissure sealant
Authors: Correr Gisele Maria , Caldo-Teixeira Angela S. , Alonso Roberta Caroline Bruschi , Puppin-Rontani Regina Maria , Sinhoreti Mário Alexandre Coelho , Correr-Sobrinho Lourenço
Published: December 2006

The aim of this study was to evaluate the effect of saliva contamination (SCT) and re-etching time (RET) on the shear bond strength (SBS) of the Fluroshield sealant. Forty-five extracted third molars were sectioned and flattened until reach an enamel surface area. Then, all samples were etched for 30 sec with 35% phosphoric acid and then they were distributed into 9 groups (n=10) according to SCT and RET (seconds), respectively: G1- control (no SCT and no RET); G2- 30s and 0s; G3- 60s and 0s; G4-30s and 2s; G5- 30s and 5s; G6- 30s and 15s; G7-60s and 2s; G8- 60s and 5s; G9- 60s and 15s. The sealant was applied according to the manufacturer's instructions. The samples were stored in distilled water at 37ºC for 72h and subjected to the SBS test. The results indicated that there was no statistically significant difference between the groups (p>0.05). However, it could be noticed that: 1- the longer the SCT, the lower the SBS values; 2 - the longer the RET, the higher the SBS values. It could be concluded that there was a tendency to the shortest SCT (30s) associated to the longest RET (5 and 15s) to reach similar SBS values for the control group.
Retention of provisional crowns cemented with eight temporary cements: comparative study
Authors: Rego Mariana Ribeiro de Moraes , Santiago Luiz Carlos
Published: December 2006

Many temporary cements are commercially available; therefore, it is necessary to indicate them for each clinical requirement with regard to the tensile strength of prosthetic retainers. Thus, the purpose of this study was to compare the retention of provisional crowns cemented with eight temporary cements, over full crown preparations with standardized mechanical principles as height, taper, and length. For that purpose, eighty human first premolars received full crown preparation with standardized height and taper. Provisional crowns were fabricated and luted with eight brands of temporary cements. Twenty four hours after cementation, the restorations were submitted to tensile strength test in a universal testing machine and the data submitted to ANOVA and Bonferroni tests. Mean tensile strength values ranged from 20.1N for Nogenol cement to 67.5N for Hydro C cement. Statistically significant difference (p<0.05) was found between Hydro C and the other groups, except for Temp Bond and Rely X Temp, which presented statistically significant difference when compared to Freegenol and Nogenol temporary cements. The crowns cemented with Hydro C cement were more retentive that than those cemented with the other cements, except for Rely X Temp and Temp Bond. The less retentive crowns were those cemented with Nogenol and Freegenol temporary cements.
Multiple-unit implant frames: one-piece casting vs. laser welding and brazing
Authors: Costa Elza Maria Valadares da , Neisser Maximiliano Piero , Bottino Marco Antônio
Published: December 2006

The linear distortion of prostheses over implants, one-piece casting and cast in sections followed by laser welding by laser and brazing was evaluated in an edentulous mandibular model with five parallel abutments, with a distance of 10mm from center to center. Seventy five gold cylinders were tightened with screws on the abutments with 10Ncm torque. The cylinder/analogue assemblies were measured by microscopic examination (0.001mm accuracy) and the obtained results were compared with the GC (control group). Fifteen metal frames were waxed and cast in a gold alloy (Stabilor, Degussa Hulls, Brazil) and divided into three groups with five elements each, as followed: GM (one-piece casting), GB (section and brazing) and GL (section and laser welding). In all groups, measurements were taken at the right, left, buccal and lingual sides of the cylinder/analogue interface and the results were submitted to analysis of variance (ANOVA) and to the Tukey test (5%). The smallest amount of distortion was seen in the laser group (GL with a mean value of 13.58), followed by the brazing group (GB with a mean value of 24.33) and one-piece (GM with a mean value of 40.00). The greatest distortion was found in the one-piece group (GM).
Pattern of disocclusion in patients with complete cleft lip and palate
Authors: Matos Daniella Andaluza Dias , Teixeira Marcelo Lucchesi , Pinto João Henrique Nogueira , Lopes José Fernando Scarelli , Dalben Gisele da Silva
Published: December 2006

OBJECTIVE: to analyze the pattern of disocclusion during excursive mandibular movements and presence or absence of occlusal interferences and occlusal pathologies (gingival recession and abfraction). METHOD: examination of 120 individuals divided into two groups, as follows: Group 1 - 90 patients with complete cleft lip and palate (study group), subdivided into 30 patients with complete left unilateral cleft lip and palate, 30 patients with complete right unilateral cleft lip and palate and 30 patients with complete bilateral cleft lip and palate; Group 2 - 30 individuals without clefts (control group). RESULTS: 58.8% of patients in Group 1 presented unilateral or bilateral canine guidance, 26.6% presented unilateral or bilateral group function and 54.4% presented lateral movements through the posterior teeth. Regarding protrusive movements, 80% presented anterior guidance and 20% presented posterior guidance. In Group 2, 69.6% of individuals presented unilateral or bilateral canine guidance, 43.2% presented unilateral or bilateral group function and only 13.3% presented lateral movements through the posterior teeth; 3.4% presented protrusion through the posterior teeth. CONCLUSIONS: there was no difference in the pattern of disocclusion between subgroups of patients with clefts. Group 2 presented predominance of bilateral group function, whereas Group 1 presented a higher prevalence of posterior guidance during lateral movements. Protrusion occurred primarily through anterior guidance in Group 2 and through the posterior teeth in Group 1. There was high prevalence of occlusal interferences at the molar area for both groups, yet with no correlation with occlusal pathologies (recession and abfraction).
Evaluation of the surface hardness of composite resins before and after polishing at different times
Authors: Chinelatti Michelle Alexandra , Chimello Daniela Thomazatti , Ramos Renata Pereira , Palma-Dibb Regina Guenka
Published: December 2006

PURPOSE: The aim of this study was to evaluate the surface hardness of six composite resins: Revolution, Natural Flow, Fill Magic Flow, Flow-it! (flowables), Silux Plus (microfilled) and Z100 (minifilled) before and after polishing at different times. MATERIALS AND METHODS: For this purpose, 240 specimens (5mm diameter, 1.4mm high) were prepared. Vickers hardness was determined before and after polishing at different times: immediately, 24h, 7 and 21 days after preparation of the samples. Statistical analysis was performed by ANOVA and Tukey test. RESULTS: There was no difference in the hardness of flowable resins, which had lower hardness than the minifilled resin. The minifilled resin showed the highest surface hardness as compared to the other materials (p<0.01). All materials exhibited higher hardness after polishing, being more evident after 7 days. CONCLUSION: It may be concluded that, regardless of the composite resin, surface hardness was considerably increased when polishing was delayed and performed 1 week after preparation of the samples.
Airpolishing effect on bovine enamel and the posterior remineralizing effect of saliva: estudo in vitro
Authors: Ribeiro Helena Zaramella Vono , Lima José Eduardo de Oliveira , Vono Bernardo Gonzalez , Machado Maria Aparcida de Andrade Moreira , Silva Salete Moura Bonifácio da
Published: December 2006

PURPOSE: The aim of the present study was to evaluate the alterations of surface microhardness and wear caused by the sodium bicarbonate jet on bovine enamel and the further remineralizing effect of artificial saliva. METHODS: Fifteen enamel samples (4,0mm x 4,0mm) were used, which constituted the groups: no treatment (MI); treatment with sodium bicarbonate jet (MII and DI); treatment with sodium bicarbonate jet and immersion in saliva for one hour (MIII and DII), 24 hours (MIV and DIII) and 7 days (MV and DIV). Microhardness tests were carried out using a microdurometer in groups M and wear tests by a rugosimeter in groups D. The data were assessed by the one criterion variance analysis and Tukey test. RESULTS: The mean value of microhardness, in KHN, in groups MI, MII, MIII, MIV and MV were 359,80; 335,46; 369,20; 377,73 and 341,86, respectively, whereas the mean values in µm, of wear for group DI, DII, DIII and DIV were 0,564; 0,519; 0,441 and 0,428, respectively. CONCLUSIONS: The sodium bicarbonate jet caused a wear and a reduction in microhardness on the enamel surface; saliva promoted the recovery of initial condition surface microhardness and reduced the wear; the repairing effect of saliva on the surface microhardness alterations occurred within one hour of treatment, having no significant statistical difference from the effect obtained in 24 hours; the best saliva repairing effect on the wear occurred with treatment of 24 hours.
Histomorphometric analysis of pure titanium implants with porous surface versus rough surface
Authors: Brentel Aline Scalone , Vasconcellos Luana Marotta Reis de , Oliveira Marize Varella , Graça Mário Lima de Alencastro , Vasconcellos Luis Gustavo Oliveira de , Cairo Carlos Alberto Alves , Carvalho Yasmin Rodarte
Published: December 2006

The purpose of this study was to analyze the bone repair around commercially pure titanium implants with rough and porous surface, fabricated using powder metallurgy technique, after their insertion in tibiae of rabbits. Seven male rabbits were used. Each animal received 3 porous-surface implants in the left tibia and 3 rough-surface implants in the right tibia. The rabbits were sacrificed 4 weeks after surgery and fragments of the tibiae containing the implants were submitted to histological and histomorphometric analyses to evaluate new bone formation at the implant-bone interface. Means (%) of bone neoformation obtained in the histomorphometric analysis were compared by Student's t-test for paired samples at 5% significance level.. The results of the histological analysis showed that osseointegration occurred for both types of implants with similar quality of bone tissue. The histomorphometric analysis revealed means of new bone formation at implant-bone interface of 79.69 ± 1.00% and 65.05 ± 1.23% for the porous- and rough-surface implants, respectively. Statistically significant difference was observed between the two types of implants with respect to the amount new bone formation (p<0.05). In conclusion, the porous-surface implants contributed to the osseointegration because they provide a larger contact area at implant-bone interface.
Influence of calcium hydroxide points on the quality of intracanal dressing filling
Authors: Rahde Nicole de Mello , Figueiredo José Antonio Poli , Oliveira Elias Pandonor Motcy
Published: December 2006

PURPOSE: The aim of this study was to evaluate, in vitro, the quality of calcium hydroxide [Ca(OH)2] paste filling (Ultracal, Ultradent) associated or not with Ca(OH)2-containing gutta-percha points (Calcium Hydroxide Plus PointsTM, Roeko) in curved root canals. MATERIAL AND METHODS: One hundred and twenty roots of extracted human teeth, randomly divided into three curvature ranges (mild - 0 to 14º; moderate - 15º to 29º; severe - >30º) were used. After chemomechanical preparation, the roots were assigned to 4 groups (n=30), according to the technique of intracanal dressing placement: group 1 - Ca(OH)2 paste was applied with a lentulo spiral; group 2 - Ca(OH)2 paste was applied with a lentulo spiral and a Ca(OH)2 point was inserted into the canal; group 3 - Ca(OH)2 paste was applied with a NavitipTM tip (supplied with Ultracal system); group 4 - Ca(OH)2 paste was applied with a NavitipTM tip and a Ca(OH)2 point was inserted into the canal. The roots were cleared and the quality of apical third filling was assessed by a calibrated experienced examiner. The specimens were examined under stereomicroscopy and scored 1 to 4 (i.e., from inadequate to complete root canal filling). The results were analyzed statistically by ANOVA and Duncan's post hoc test at 5% significance level. RESULTS: There were no statistically significant differences (p>0.05) among the curvature degrees in groups 1, 3 and 4. Severely curved roots in group 2 presented bordering significance (p=0.05). The groups that associated the use of Ca(OH)2 paste and points (2 and 4) showed better apical filling than the other groups, but this difference was statistically significant (p<0.001) only for roots with severe curvature. CONCLUSION: According to the results of this study, the curvature degree did not influence the quality of filling. The techniques that used Ca(OH)2-containing gutta-percha points yielded better filling of the apical third in roots with severe curvature.
Healing of root perforations treated with Mineral Trioxide Aggregate (MTA) and Portland cement
Authors: Juárez Broon Norberto , Bramante Clovis Monteiro , Assis Gerson Francisco de , Bortoluzzi Eduardo Antunes , Bernardineli Norberti , Moraes Ivaldo Gomes de , Garcia Roberto Brandão
Published: December 2006

Fourteen root perforations were performed for microscopic evaluation of the repair of interradicular tissue in dogs' teeth. These perforations were accomplished at low-speed with a STP 58 bur at the cervical third of the mesial root toward the furcation under irrigation with saline solution, followed by immediate sealing with ProRoot MTA, MTA-Angelus and white Portland cement. The dogs were killed after 90 days, revealing good results. The Kruskal-Wallis test did not demonstrate any statistically significant difference. It was concluded that the three materials showed good sealing in mineralized tissue, with complete closure, and they were free of inflammation in most teeth.
Performance of Brazilian and imported glass ionomer cements used in Atraumatic Restorative Treatment (ART) regarding microleakage in primary molars
Authors: Ferreira Fernanda de Morais , Vale Miriam Pimenta Parreira do , Jansen Wellington Corrêa , Paiva Saul Martins , Pordeus Isabela Almeida
Published: December 2006

With the aim of assessing the performance of Brazilian and imported glass ionomer cements (GIC) with regard to microleakage, 40 primary molars received two standard class II cavity preparations with margins in enamel. Twenty cavities were filled with Brazilian materials (Vidrion® R and Vidrion® R Caps) and the other 20 cavities were filled with imported materials (Fuji® IX and Fuji® IX GPFast capsule). All fillings were performed by a single operator according to the manufacturer's instructions. Teeth were immersed in 0.5% methylene blue and half-sectioned. Three independent calibrated examiners assessed microleakage using scores (0-3). Data were submitted to the Kruskal-Wallis statistical test and Wilcoxon analysis. High microleakage indexes were verified for all ionomer cements: 59.5% of the samples restored with Vidrion® R or Vidrion® R Caps and 83.4% of the samples restored with Fuji® IX or Fuji® IX GPFast capsule obtained the maximum score (3). The Brazilian ionomer cements presented less microleakage than imported cements, although this difference was only significant (p=0.003) among the encapsulated materials.
Effect of betamethasone and diclofenac sodium on serum and tissue concentration of amoxicillin: in vivo study in rats
Authors: Mattos Filho Thales Rocha , Junqueira Marcelo de Souza , Groppo Francisco Carlos , Motta Rogério Heládio Lopes , Perazzo Fábio Ferreira
Published: December 2006

OBJECTIVE: Antimicrobial agents in combination with anti-inflammatory drugs have been usually prescribed in both Medicine and Dentistry. However, few scientific reports support this clinical practice. The aim of this study was to evaluate the effect of betamethasone and diclofenac sodium on serum and tissue concentration of amoxicillin in rats. METHODS: Four polyurethane sponges were implanted in the back skin of 48 rats. After seven days the animals were divided into 6 groups (n=8). Group 1: amoxicillin (25 mg/kg); G2: diclofenac sodium (2.5 mg/kg); G3: betamethasone (0.1 mg/kg); G4: diclofenac sodium and amoxicillin; G5: betamethasone and amoxicillin; and G6: 0.9% sodium chloride solution (1.0 mL - control group). All drugs were administered in a single dose. After 90 minutes, the granulomatous tissues of each animal were surgically removed and weighed. Blood was collected from cervical plexus, centrifuged and 10µL of serum was placed on paper discs. In order to estimate amoxicillin concentration, serum and granulomatous tissues were separately submitted to microbiological assay, which used 10(8)cfu/mL of Staphylococcus aureus ATCC 25923 (penicillin-susceptible strain). After incubation (18 hours, 37ºC) the inhibition zones were measured and compared to a regression curve. RESULTS: No inhibition zones were observed for groups 2, 3 and 6. Tissue and serum concentrations of both G1 (4.14µg/g and 2.06µg/mL, respectively) and G5 (3.87µg/g and 1.70µg/mL, respectively) showed statistically significant differences (Kruskal-Wallis, p<0.05) in comparison to G4 (1.45µg/g and 0.41µg/mL, respectively). G1 and G5 did not differ significantly (p>0.05). CONCLUSION: Considering single doses, betamethasone did not interfere with amoxicillin levels but diclofenac sodium reduced both tissue and serum levels of amoxicillin in rats.
Retrospective analysis of orthodontic treatment outcomes and its relation to postretention stability
Authors: Freitas Karina Maria Salvatore de , Freitas Marcos Roberto de , Janson Guilherme , Pinzan Arnaldo , Henriques José Fernando Castanha
Published: December 2006

OBJECTIVE: The present study was designed to retrospectively evaluate Class I malocclusion cases treated with extraction of the four first premolars, aiming to establish the relationship between the quality of orthodontic treatment outcomes and the long-term occlusal stability. MATERIAL AND METHODS: The sample comprised 94 patients of both genders, presenting Class I malocclusion, treated with extractions of the four first premolars and Edgewise mechanics. All the patients selected were whites, being 50 males and 44 females. The mean pretreatment age was 13.46 years (s.d. 1.8). The mean treatment time was 2.09 years (s.d. 0.58), the mean retention time was 1.63 years (s.d. 0.73) and the mean time of postretention evaluation was 5.31 years (s.d. 1.61). The dental casts were measured at pretreatment (T1), posttreatment (T2) and postretention (T3), by the PAR index and by the Little irregularity index, and the correction due to treatment (T1-2) and the change at the postretention period (T3-2) were calculated. The descriptive statistics was performed and the Pearson correlation coefficient was applied for the PAR and the Little indices in the total sample, among the times evaluated. RESULTS: The mean PAR reduction due to treatment was 78.54%, and 66.6%, at the postretention stage related to pretreatment stage. Significant correlations were found for the PAR index at the times evaluated, except between T1 and T2 and between T1-2 and T3. In other words, the higher the treatment correction (T1-2), the lower the posttreatment PAR index (PAR T2) will be, and the higher will be the PAR change at the postretention period (PAR T3-2). Also, the higher the posttreatment PAR score (PAR T2), the higher will be the postretention PAR score (PAR T3). CONCLUSION: It was concluded that the quality of orthodontic treatment outcomes is not related to the long-term occlusal stability.
Evaluation of apical microleakage of teeth sealed with four different root canal sealers
Authors: Dultra Fábio , Barroso Juliana Machado , Carrasco Laise Daniela , Capelli Alexandre , Guerisoli Danilo M. Zanello , Pécora Jesus Djalma
Published: December 2006

OBJECTIVES: to compare the apical sealing ability of four root canal sealers. MATERIAL AND METHODS: forty extracted human maxillary canines were instrumented 1 mm short of the anatomical apex and randomly assigned to four groups (n=10), according to the root canal sealer used for obturation: Endofill, AH Plus, EndoREZ and Epiphany. Root canals were obturated with gutta-percha points, except for the Epiphany group, in which resin points (Resilon) were used. The teeth were immersed in India ink for seven days and clarified using methyl salicylate. The extent of apical dye penetration was measured with a measuroscope in all aspects of the canal. RESULTS: AH Plus (0.02 mm ± 0.07), Epiphany (0.00 mm ± 0.00) and EndoREZ (0.32 mm ± 0.62) did not differ statistically to each other (p>0.01). EndoFill presented the highest dye penetration mean (0.83 mm ± 0.73) and was statistically different from the other sealers (p<0.01). CONCLUSION: the resin-based root canal sealers presented lesser apical microleakage than the zinc oxide and eugenol based sealer. No statistical differences were observed among resin based sealers.
Fluoride level in public water supplies of cities from the northwest region of São Paulo State, Brazil
Authors: Saliba Nemre Adas , Moimaz Suzely Adas Saliba , Tiano Ana Valéria Pagliari
Published: December 2006

It may be difficult for small and medium cities to obtain information about the fluoride content of public water, because of the lack of equipments and technicians. This study aimed to analyze the fluoride levels of the water supplied by the public treatment stations of 40 cities situated in the northwest region of São Paulo State, during a period of 6 months, to verify if fluoridation occurs in a continuous manner and if the fluoride levels are within the recommended. Maps of the water distribution system were obtained from the water treatment companies and utilized to randomize the addresses of the collection sites, so that they included all regions with treated water sources. One water sample by month was collected and analyzed in duplicate using an ion-specific-electrode. Samples with 0.6 to 0.8 mgF/L were considered acceptable. In the 38 cities that regularly provided the samples in the 6 months of the study, water from 144 collection sites was collected and a total of 864 samples were analyzed, of which 61.81 percent were classified as unacceptable. It was observed that 33 cities performed fluoridation but in 78.79 percent of these cities there were variations in the fluoride level among the sites and in the same site during the period of study. One can conclude that most of these cities do not control the fluoride levels in the public water, since fluoridation occurs in a discontinuous manner and in most of the situations not within the recommended concentrations.
Fluoride concentration in water at the area supplied by the Water Treatment Station of Bauru, SP
Authors: Lodi Carolina Simonetti , Ramires Irene , Buzalaf Marília Afonso Rabelo , Bastos José Roberto de Magalhães
Published: December 2006

OBJECTIVE: to analyze the fluoride concentration in the public water supply at the area supplied by the Water Treatment Station of Bauru and classify the samples as acceptable or unacceptable according to the fluoride concentration. MATERIAL AND METHODS: samples were collected from 30 areas at two periods, October 2002 and March 2003. The fluoride concentration in the samples was determined in duplicate, using an ion sensitive electrode (Orion 9609) connected to a potentiometer (Procyon, model 720). Samples with fluoride concentration ranging from 0.55 to 0.84 mg F/L were considered acceptable, and those whose concentration was outside this range as unacceptable. Data were analyzed by descriptive statistics. RESULTS: the fluoride concentration of the water samples varied between 0.31 and 2.01 mg F/L. Nearly 56% of the samples were classified as acceptable. CONCLUSION: the variations in fluoride concentration at the area supplied by the Water Treatment Station reinforce the need of constant monitoring for maintenance of adequate fluoride levels in the public water supply.
Low temperature synthesis and characterization of Mn3O4 nanoparticles
Authors: Baykal Abdülhadi , Köseoğlu Yüksel , Şenel Mehmet
Published: December 2006

Heating hydrous manganese (II) hydroxide gel at 85 °C for 12 hours produces Mn3O4 nanoparticles. They were characterized by X-ray powder diffraction (XRD) and infrared spectroscopy (FTIR). The particle size estimated from the SEM and X-ray peak broadening is approximately 32 nm, showing them to be nanocrystalline. EPR measurements confirm a typical Mn2+signal with a highly resolved hyperfine structure.