cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.7515485.v1
title: Capacity analysis of pigment removal of composite resin by hydrogen peroxide 35%

description: Abstract Objective Evaluate in vitro the ability to removal pigments of composite resin after application of hydrogen peroxide 35%. Material and method Concocted to-20 resin samples composed Opallis (FGM), A1 color, in circular metal matrix. The samples were divided into 4 groups (n = 5) the following coloring agents: distilled water (control), coffee, red wine and Coca-Cola®. In the staining, the samples were immersed in the solutions for 72 hours, with daily change of beverages. Proceeded to the application of 35% hydrogen peroxide gel (Whiteness HP Blue Calcium, FGM) in 3 sessions, one application of gel per session that remained in the samples for 40 minutes. Color measurements were made initially after staining after application of the peroxide and for 21 days using Vita Easyshade spectrophotometer. The data were submitted to two-way ANOVA and Tukey’s test (α = 0.05). Result Significant color change was observed in specimens after immersion in the solutions, except the control group. Hydrogen peroxide was capable of removing the stains, however the color did not return to the baseline in any of the staining groups, especially for the groups immersed in coffee. Conclusion Staining solutions can stain the composite resin. The application of 35% hydrogen peroxide can remove partially the staining, minimizing the color change produced by the staining solutions. However, the bleaching gel was not capable of removing all staining, especially for the coffee group.
DOI: 10.6084/m9.figshare.7515482.v1
title: Assessment of the effects of decontamination and storage methods on the structural integrity of human enamel

description: Abstract Introduction The storage of teeth for use in research is a controversial issue with no consensus on the most appropriate treatment method for this purpose. Objective The aim of this study was analyze the effectiveness and the influence of different methods of decontamination and storage of human enamel samples, in order to maintain their integrity. Material and method The sample consisted of 124 molars distributed randomly into three groups according to the method: control - distilled water, 0.1% thymol and 0.02% sodium azide. The tests performed were laser fluorescence, surface microhardness and profilometry analysis (0, 15 and 30 days) and Microbiological test (7, 15 and 30 days). Data were analyzed by the ANOVA and Tukey tests (P &lt;0.05). Result In the laser fluorescence test, thymol proved to be more feasible for maintaining the integrity of the dental organ, since it did not show significant variations in values among the analyzed periods (P&gt; 0.05). The surface microhardness analysis showed loss of tooth structure in all methods, and sodium azide led to a lower level of tooth loss. Profilometry analysis showed loss of mass in all groups whereas sodium azide showed the greatest loss. None of the methods was able to inhibit bacterial growth. Conclusion Among the processing methods analyzed none was able to combine effective decontamination and storage with maintenance of the structural integrity of the human enamel.
DOI: 10.6084/m9.figshare.7515485
title: Capacity analysis of pigment removal of composite resin by hydrogen peroxide 35%

description: Abstract Objective Evaluate in vitro the ability to removal pigments of composite resin after application of hydrogen peroxide 35%. Material and method Concocted to-20 resin samples composed Opallis (FGM), A1 color, in circular metal matrix. The samples were divided into 4 groups (n = 5) the following coloring agents: distilled water (control), coffee, red wine and Coca-Cola®. In the staining, the samples were immersed in the solutions for 72 hours, with daily change of beverages. Proceeded to the application of 35% hydrogen peroxide gel (Whiteness HP Blue Calcium, FGM) in 3 sessions, one application of gel per session that remained in the samples for 40 minutes. Color measurements were made initially after staining after application of the peroxide and for 21 days using Vita Easyshade spectrophotometer. The data were submitted to two-way ANOVA and Tukey’s test (α = 0.05). Result Significant color change was observed in specimens after immersion in the solutions, except the control group. Hydrogen peroxide was capable of removing the stains, however the color did not return to the baseline in any of the staining groups, especially for the groups immersed in coffee. Conclusion Staining solutions can stain the composite resin. The application of 35% hydrogen peroxide can remove partially the staining, minimizing the color change produced by the staining solutions. However, the bleaching gel was not capable of removing all staining, especially for the coffee group.
DOI: 10.6084/m9.figshare.7513157.v1
title: Analysis of the hardness of a new restorative material for ART: Glass Carbomer

description: Abstract Objective This study evaluated the microhardness of two encapsulated ionomer materials – Glass Carbomer (GC-GCP Dental) and Riva Light Cure (RL-SDI) in combination with four light curing units (Carbo LED lamp, GCP-Dental, Demi LED curing light, Kerr, Poli Wireless, Kavo, Radii Plus, SDI). Material and method Eighty specimens were prepared following the manufacturer’s guidelines, 40 for each ionomer material and for 10 specimens, one light curing unit was used. After 7 days of storage in distilled water and at room temperature, 80 specimens were tested with the Vickers hardness (microhardness HMV 2T, Shimadzu, Japan). Five indentations were performed on each specimen (center, right, left, top and bottom). The test was carried out under a load of 100 g, with a 10 second penetration time. Result Independent of the curing unit the Riva Light Cure (RL-SDI) obtained the lower hardness than the material Glass Carbomer (GC-GCP-Dental). The microhardness of Glass Carbomer (GC-GCP-Dental) was influenced by the type of curing unit used as a heat treatment. The analysis of variance and Tukey test (p&lt;0.05) showed that the interaction of factors material vs. curing unit (p&lt;0.001), the main factor material (p&lt;0.001) and curing unit (p=0.002) were statistically significant. Conclusion The ionomeric material Glass Carbomer (GCP-Dental) had significantly higher hardness value when compared with glass ionomer modified by resin Riva Light Cure (SDI), regardless of the light curing unit used.
DOI: 10.6084/m9.figshare.7515482
title: Assessment of the effects of decontamination and storage methods on the structural integrity of human enamel

description: Abstract Introduction The storage of teeth for use in research is a controversial issue with no consensus on the most appropriate treatment method for this purpose. Objective The aim of this study was analyze the effectiveness and the influence of different methods of decontamination and storage of human enamel samples, in order to maintain their integrity. Material and method The sample consisted of 124 molars distributed randomly into three groups according to the method: control - distilled water, 0.1% thymol and 0.02% sodium azide. The tests performed were laser fluorescence, surface microhardness and profilometry analysis (0, 15 and 30 days) and Microbiological test (7, 15 and 30 days). Data were analyzed by the ANOVA and Tukey tests (P &lt;0.05). Result In the laser fluorescence test, thymol proved to be more feasible for maintaining the integrity of the dental organ, since it did not show significant variations in values among the analyzed periods (P&gt; 0.05). The surface microhardness analysis showed loss of tooth structure in all methods, and sodium azide led to a lower level of tooth loss. Profilometry analysis showed loss of mass in all groups whereas sodium azide showed the greatest loss. None of the methods was able to inhibit bacterial growth. Conclusion Among the processing methods analyzed none was able to combine effective decontamination and storage with maintenance of the structural integrity of the human enamel.
DOI: 10.6084/m9.figshare.7513157
title: Analysis of the hardness of a new restorative material for ART: Glass Carbomer

description: Abstract Objective This study evaluated the microhardness of two encapsulated ionomer materials – Glass Carbomer (GC-GCP Dental) and Riva Light Cure (RL-SDI) in combination with four light curing units (Carbo LED lamp, GCP-Dental, Demi LED curing light, Kerr, Poli Wireless, Kavo, Radii Plus, SDI). Material and method Eighty specimens were prepared following the manufacturer’s guidelines, 40 for each ionomer material and for 10 specimens, one light curing unit was used. After 7 days of storage in distilled water and at room temperature, 80 specimens were tested with the Vickers hardness (microhardness HMV 2T, Shimadzu, Japan). Five indentations were performed on each specimen (center, right, left, top and bottom). The test was carried out under a load of 100 g, with a 10 second penetration time. Result Independent of the curing unit the Riva Light Cure (RL-SDI) obtained the lower hardness than the material Glass Carbomer (GC-GCP-Dental). The microhardness of Glass Carbomer (GC-GCP-Dental) was influenced by the type of curing unit used as a heat treatment. The analysis of variance and Tukey test (p&lt;0.05) showed that the interaction of factors material vs. curing unit (p&lt;0.001), the main factor material (p&lt;0.001) and curing unit (p=0.002) were statistically significant. Conclusion The ionomeric material Glass Carbomer (GCP-Dental) had significantly higher hardness value when compared with glass ionomer modified by resin Riva Light Cure (SDI), regardless of the light curing unit used.
DOI: 10.6084/m9.figshare.7516913
title: Effect of dietary sugars on dual-species biofilms of Streptococcus mutans and Streptococcus sobrinus – a pilot study

description: Abstract Introduction Frequent consumption of sugars and the presence of Streptococcus mutans and Streptococcus sobrinus are correlated with higher caries experience. Objective The aim of this pilot study was to elucidate the effect of different fermentable carbohydrates on biomass formation and acidogenicity of S. mutans and S. sobrinus biofilms. Material and method Single and dual-species biofilms of S. mutans ATCC 25175 and S. sobrinus ATCC 27607 were grown at the bottom of microtiter plates at equal concentrations for 24 h at 37 °C under micro-aerobic atmosphere. Carbohydrates were added at 2% concentration: maltose, sucrose, glucose and lactose. BHI Broth (0.2% glucose) was used as negative control. Acidogenicity was assessed by measuring the pH of spent culture medium after 24 h, immediately after refreshing the culture medium and for the next 1 h and 2 h. Crystal violet staining was used as an indicator of the total attached biofilm biomass after 24 h incubation. Data were analyzed by two-way ANOVA followed by Bonferroni post hoc test. Significance level was set at 5%. Result All carbohydrates resulted in higher biomass formation in single- and dual-species biofilms when compared to the control group. Sucrose, lactose and maltose showed higher acidogenicity than the control group in both single- and dual-species biofilms after 24 h. Conclusion These findings indicate that the type of biofilm (single- or dual-species) and the carbohydrate used may influence the amount of biomass formed and rate of pH reduction.
DOI: 10.6084/m9.figshare.7516913.v1
title: Effect of dietary sugars on dual-species biofilms of Streptococcus mutans and Streptococcus sobrinus – a pilot study

description: Abstract Introduction Frequent consumption of sugars and the presence of Streptococcus mutans and Streptococcus sobrinus are correlated with higher caries experience. Objective The aim of this pilot study was to elucidate the effect of different fermentable carbohydrates on biomass formation and acidogenicity of S. mutans and S. sobrinus biofilms. Material and method Single and dual-species biofilms of S. mutans ATCC 25175 and S. sobrinus ATCC 27607 were grown at the bottom of microtiter plates at equal concentrations for 24 h at 37 °C under micro-aerobic atmosphere. Carbohydrates were added at 2% concentration: maltose, sucrose, glucose and lactose. BHI Broth (0.2% glucose) was used as negative control. Acidogenicity was assessed by measuring the pH of spent culture medium after 24 h, immediately after refreshing the culture medium and for the next 1 h and 2 h. Crystal violet staining was used as an indicator of the total attached biofilm biomass after 24 h incubation. Data were analyzed by two-way ANOVA followed by Bonferroni post hoc test. Significance level was set at 5%. Result All carbohydrates resulted in higher biomass formation in single- and dual-species biofilms when compared to the control group. Sucrose, lactose and maltose showed higher acidogenicity than the control group in both single- and dual-species biofilms after 24 h. Conclusion These findings indicate that the type of biofilm (single- or dual-species) and the carbohydrate used may influence the amount of biomass formed and rate of pH reduction.
DOI: 10.6084/m9.figshare.7508159
title: Evaluation of the surface roughness of a nanofilled composite resin submitted to different smoothing and finishing techniques

description: Abstract Introduction: Controlling the surface smoothness characteristics of the composite resin when performing a direct restorative technique is one of the factors involved in achieving restorative success. Objective: The purpose of this study was to evaluate the surface roughness of a nanofilled composite resin submitted to different smoothing and finishing techniques. Material and method: Fifty test specimens were made with the Z350 XT composite resin (3M ESPE) and then divided into five study groups according to the smoothing and finishing method applied, as follows: G1 (control), polyester strip; G2, composite spatula; G3, brush cleaned with absolute alcohol and dried; G4, brush cleaned with absolute alcohol, dried and moistened with Single Bond (3M ESPE); and G5, brush cleaned with absolute alcohol, dried and moistened with Natural Glaze surface sealant (DFL). After fabrication, the specimens were stored for 24 h in deionized water. The surface roughness of the specimens was measured using a profilometer. Surface roughness means were compared by analysis of variance followed by Tukey’s test at a level of significance of 5%. Result: The lowest surface roughness was observed in G1 (control group) and the highest, in G3. G5 had lower surface roughness values compared to the other test groups, and presented values similar to those of the control group. Conclusion: The smoothing and finishing techniques influenced the surface roughness of the composite resin. Application of the surface sealant by the copolymerization technique resulted in lower roughness values. The use of a clean, dry brush promoted roughness values beyond the acceptable limit, and is therefore liable to compromise the performance of composite resin restorations.
DOI: 10.6084/m9.figshare.7508159.v1
title: Evaluation of the surface roughness of a nanofilled composite resin submitted to different smoothing and finishing techniques

description: Abstract Introduction: Controlling the surface smoothness characteristics of the composite resin when performing a direct restorative technique is one of the factors involved in achieving restorative success. Objective: The purpose of this study was to evaluate the surface roughness of a nanofilled composite resin submitted to different smoothing and finishing techniques. Material and method: Fifty test specimens were made with the Z350 XT composite resin (3M ESPE) and then divided into five study groups according to the smoothing and finishing method applied, as follows: G1 (control), polyester strip; G2, composite spatula; G3, brush cleaned with absolute alcohol and dried; G4, brush cleaned with absolute alcohol, dried and moistened with Single Bond (3M ESPE); and G5, brush cleaned with absolute alcohol, dried and moistened with Natural Glaze surface sealant (DFL). After fabrication, the specimens were stored for 24 h in deionized water. The surface roughness of the specimens was measured using a profilometer. Surface roughness means were compared by analysis of variance followed by Tukey’s test at a level of significance of 5%. Result: The lowest surface roughness was observed in G1 (control group) and the highest, in G3. G5 had lower surface roughness values compared to the other test groups, and presented values similar to those of the control group. Conclusion: The smoothing and finishing techniques influenced the surface roughness of the composite resin. Application of the surface sealant by the copolymerization technique resulted in lower roughness values. The use of a clean, dry brush promoted roughness values beyond the acceptable limit, and is therefore liable to compromise the performance of composite resin restorations.
DOI: 10.6084/m9.figshare.7514948
title: Effects of erosive challenge on the morphology and surface properties of luting cements

description: Abstract Introduction Few studies investigated the surface properties of luting cements after erosive challenge. Objective To evaluate the surface roughness (Ra), Vickers hardness (VHN) and morphology of 4 luting cements after erosive challenge. Material and method Twenty specimens of each cement were prepared (4×2mm) and divided into experimental (erosive challenge) and control (artificial saliva) groups (n=10): Rely X U200 (U200); Rely X ARC (ARC); Ketac Cem Easy Mix (Ketac) and Zinc phosphate (ZnP). The erosive challenge was performed by four daily erosive cycles (90s) in a cola drink and 2 h in artificial saliva over 7 days. Ra and VHN readings were performed before and after erosion. The percentage of hardness loss (%VHN) was obtained after erosion. The surface morphology was analyzed by scanning electron microscopy (SEM). ANOVA, Tukey and Student-T tests were used (α=0.05). Result After erosion, all luting cements had increase in Ra values and U200 and ZnP groups had the highest %VHN. After saliva immersion, only U200 and ZnP groups had significant increases in Ra values and there were no significant differences among the groups in %VHN. SEM analysis showed that Ketac and ZnP groups had rough and porous surfaces, and U200 group had higher resin matrix degradation than ARC group. Conclusion Erosive challenge with a cola drink affected the surface properties of all luting cements.
DOI: 10.6084/m9.figshare.7514948.v1
title: Effects of erosive challenge on the morphology and surface properties of luting cements

description: Abstract Introduction Few studies investigated the surface properties of luting cements after erosive challenge. Objective To evaluate the surface roughness (Ra), Vickers hardness (VHN) and morphology of 4 luting cements after erosive challenge. Material and method Twenty specimens of each cement were prepared (4×2mm) and divided into experimental (erosive challenge) and control (artificial saliva) groups (n=10): Rely X U200 (U200); Rely X ARC (ARC); Ketac Cem Easy Mix (Ketac) and Zinc phosphate (ZnP). The erosive challenge was performed by four daily erosive cycles (90s) in a cola drink and 2 h in artificial saliva over 7 days. Ra and VHN readings were performed before and after erosion. The percentage of hardness loss (%VHN) was obtained after erosion. The surface morphology was analyzed by scanning electron microscopy (SEM). ANOVA, Tukey and Student-T tests were used (α=0.05). Result After erosion, all luting cements had increase in Ra values and U200 and ZnP groups had the highest %VHN. After saliva immersion, only U200 and ZnP groups had significant increases in Ra values and there were no significant differences among the groups in %VHN. SEM analysis showed that Ketac and ZnP groups had rough and porous surfaces, and U200 group had higher resin matrix degradation than ARC group. Conclusion Erosive challenge with a cola drink affected the surface properties of all luting cements.
DOI: 10.15468/dl.7vc2bi
title: Occurrence Download

description: A dataset containing 78 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Cynoglossum nebrodense Guss.",
 "HasCoordinate is TRUE"
 ]
}

 The dataset includes 78 records from 16 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0000496-150831095807960/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.s2v6hw
title: Occurrence Download

description: A dataset listing the 97 species recorded in GBIF matching the query:
{
 "DatasetKey" : [
 "is Captive Primate Specimens of Japan Monkey Centre"
 ]
}

 The dataset's 97 records were derived from 1 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0266031-200613084148143/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.yekvn7
title: Occurrence Download

description: A dataset containing 15771 species occurrences available in GBIF matching the query:
{
 "DatasetKey" : [
 "is UCT: Southern African Reptile Conservation Assessment (1910-2009)"
 ]
}

 The dataset includes 15771 records from 1 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0080737-200613084148143/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.st55ba
title: Occurrence Download

description: A dataset containing 129 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Entimus imperialis (Forster J.R, 1771)"
 ]
}

 The dataset includes 129 records from 14 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0286184-200613084148143/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.uzc74y
title: Occurrence Download

description: A dataset containing 1 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Alchemilla glacialis Buser",
 "HasCoordinate is true",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 1 records from 1 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0000497-150330110031120/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.sb22y4
title: Occurrence Download

description: A dataset containing 16946 species occurrences available in GBIF matching the query:
{
 "Geometry" : [
 "MULTIPOLYGON(((5.241862535476685 43.294803095683314,5.241862535476685 43.25493380778211,5.340739488601685 43.25493380778211,5.340739488601685 43.294803095683314,5.241862535476685 43.294803095683314)))"
 ]
}

 The dataset includes 16946 records from 68 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0084302-200613084148143/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.sjx57k
title: Occurrence Download

description: A dataset containing 560 species occurrences available in GBIF matching the query:
{
 "and" : [
 {
 "or" : [
 "Geometry POLYGON((13.10445 48.12985,13.93197 48.36004,13.68086 48.39238,13.4697 48.23448,13.10445 48.12985))",
 "Geometry POLYGON((13.10363 48.13577,13.90449 48.35698,14.0277 48.84982,12.90481 49.38187,12.42877 48.93103,12.49318 48.62301,12.54638 48.18337,13.10363 48.13577))"
 ]
 },
 "TaxonKey is Reptilia"
 ]
}

 The dataset includes 560 records from 12 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0266034-200613084148143/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.