Placement of fiber prefabricated or custom made posts affects the 3-year survival of endodontically treated premolars. Long-term survival of endodontically treated, maxillary anterior teeth restored with either tapered or parallel-sided glass-fiber posts and full-ceramic crown coverage. Survival of two post systems--five-year results of a randomized clinical trial. Three-year clinical comparison of survival of endodontically treated teeth restored with either full cast coverage or with direct composite restoration. Restoration of endodontically treated teeth with carbon fibre posts--a prospective study. Fracture resistance of compromised endodontically treated teeth restored with bonded post and cores: An in vitro study. Survival rate of endodontically treated teeth in relation to conservative vs post insertion techniques -- a retrospective study. Evaluation of Novel Glass Fiber-reinforced Composite Technique for Primary Anterior Teeth with Deep Carious Lesions: A 12-month Clinical Study Resin-dentin interfaces of endodontically-treated restored teeth. Post Placement Affects Survival of Endodontically Treated Premolars Clinical evaluation of root filled teeth restored with or without post-and-core systems in a specialist practice setting. An up to 3-Year Controlled Clinical Trial Comparing the Outcome of Glass Fiber Posts and Composite Cores with Gold Alloy-Based Posts and Cores for the Restoration of Endodontically Treated Teeth. Randomized clinical trial comparing the effects of post placement on failure rate of postendodontic restorations: preliminary results of a mean period of 32 months. Periapical status of endodontically treated teeth in relation to the technical quality of the root filling and the coronal restoration. Clinical evaluation of teeth restored with quartz fiber-reinforced epoxy resin posts. Comparison of Resilon and Gutta-Percha Filling Materials on Root Canal Fracture Resistance Following Restoring with Quartz Fiber Posts Influence of clinical baseline findings on the survival of 2 post systems: a randomized clinical trial. Fracture resistance and deflection of pulpless anterior teeth restored with composite or porcelain veneers. Survival rate and fracture strength of endodontically treated maxillary incisors with moderate defects restored with different post-and-core systems: an in vitro study. Randomized clinical comparison of endodontically treated teeth restored with amalgam or with fiber posts and resin composite: five-year results. Influence of periodontal ligament simulation on bond strength and fracture resistance of roots restored with fiber posts Effect of tooth type and ferrule on the survival of pulpless teeth restored with fiber posts: a 3-year clinical study. Risk factors for failure of glass fiber-reinforced composite post restorations: a prospective observational clinical study.
PURPOSE To assess whether the amount of residual coronal dentin and the placement of a prefabricated ( DT Light Post ) ( LP ) or a customized fiber post ( Ever Stick Post ) ( ES ) have a significant influence on the 3-year survival of endodontically treated premolars . METHODS A sample of 345 patients provided six groups of 60 premolars in need of endodontic treatment . Groups were defined based on the amount of dentin left at the coronal level after endodontic treatment and before abutment build-up . Within each group teeth were r and omly divided into three subgroups ( n = 20 ) . In Subgroup A , no root canal retention was provided for the coronal restoration . In Subgroups B and C , LP and ES , respectively , were placed inside the root canal . All the teeth were finally restored with a single unit metal-ceramic crown . RESULTS Data were not affected by any loss to follow-up . The overall 36-month survival rate of crowned endodontically treated premolars was 76.7 % . The lowest survival rate was recorded for teeth restored without any root canal retention ( 62.5 % ) . Teeth restored with LP had a survival rate higher ( 90.9 % ) than those restored with ES ( 76.7 % ) . The Cox regression analysis showed that the presence of root canal retention was a significant factor for survival ( P < 0.05 ) . The decrease in failure risk was higher in teeth restored with LP ( HR = 0.1 ; 95 % CI for HR = 0.09 to 0.34 ; P < 0.001 ) than when using ES ( HR = 0.5 ; 95 % CI for HR = 0.3 to 0.7 ; P = 0.003 ) . Teeth retaining one ( HR = 0.3 ; 95 % CI for HR = 0.2 to 0.7 ; P = 0.003 ) , two ( HR = 0.2 ; 95 % CI for HR = 0.1 to 0.5 ; P < 0.001 ) , or three coronal walls ( HR = 0.1 ; 95 % CI for HR = 0.05 to 0.3 ; P < 0.001 ) had a significantly lower failure risk than teeth deprived even of the ferrule effect . Similar failure risks existed for teeth missing all the coronal walls regardless of the presence or absence of a ferrule effect ( P > 0.05 ) . Interaction terms were not significant ( P > 0.05 ) . Post placement and the amount of residual coronal dentin affected the 3-year survival of endodontically treated premolars OBJECTIVES This retrospective study investigated the clinical effectiveness over up to 8 years of parallel-sided and of tapered glass-fiber posts , in combination with either hybrid composite or dual-cure composite resin core material , in endodontically treated , maxillary anterior teeth covered with full-ceramic crowns . METHODS The study population comprised 192 patients and 526 endodontically treated teeth , with various degrees of hard-tissue loss , restored by the post- and -core technique .  Four groups were defined based on post shape and core build-up material s , and within each group post- and -core restorations were assigned r and omly with respect to root morphology . Inclusion criteria were symptom-free endodontic therapy , root-canal treatment with a minimum apical seal of 4 mm , application of rubber dam , need for post- and -core complex because of coronal tooth loss , and tooth with at least one residual coronal wall . Survival rate of the post- and -core restorations was determined using Kaplan-Meier statistical analysis . RESULTS The restorations were examined clinical ly and radiologically ; mean observation period was 5.3 years . The overall survival rate of glass-fiber post- and -core restorations was 98.5 % . The survival rate for parallel-sided posts was 98.6 % and for tapered posts was 96.8 % . Survival rates for core build-up material s were 100 % for dual-cure composite and 96.8 % for hybrid light-cure composite . CONCLUSIONS For both glass-fiber post design s and for both core build-up material s , clinical performance was satisfactory . Survival was higher for teeth retaining four and three coronal walls OBJECTIVE To assess the survival rate of two different post systems after 5 years of service with a prospect i ve r and omized controlled trial . METHOD AND MATERIAL S One hundred patients in need of a post were studied . Half of the patients received long glass fiber-reinforced posts , while the other half received long metal screw posts . The posts were assigned r and omly . After at least 5 years ( mean , 61.37 months ) , follow-ups were established . When a complication occurred prior to this recall , the type and time of the complication was documented . Statistical analysis was performed using the log-rank test and Kaplan-Meier analysis . Additionally , a Cox regression was performed to analyze risk factors . RESULTS The survival rate of fiber-reinforced posts was 71.8 % . In the metal screw post group , the survival rate was significantly lower , 50.0 % ( log-rank test , P = .026 ) . Metal posts result ed more often in more unfavorable complications ( eg , root fractures ) ; consequently , more teeth ( n = 17 ) had to be extracted . The Cox regression identified the following risk factors : position of the tooth ( anterior vs posterior teeth ) , degree of coronal tooth destruction , and the post system  ( fiber-reinforced post vs metal screw post )  . Fiber-reinforced restorations loosened in several patients ; in some of these cases ( n = 6 ) , patients did not notice this , leading to the extraction of teeth . CONCLUSION Long metal screw posts should be used with great care in endodontically treated teeth . Besides the selection of the post system , other factors influence the survival of the restoration STATEMENT OF PROBLEM Little information exists regarding the outcome of crown build-ups on endodontically treated teeth restored with metal-ceramic crowns or with only a direct-placed composite . PURPOSE The aim of this study was to evaluate the clinical success rate of endodontically treated premolars restored with fiber posts and direct composite restorations and compare that treatment with a similar treatment of full-coverage with metal-ceramic crowns . MATERIAL AND METHODS Subjects included in this study had one maxillary or m and ibular premolar for which endodontic treatment and crown build up was indicated and met specific inclusion /exclusion criteria . Only premolars with Class II carious lesions and preserved cusp structure were included . Subjects were r and omly assigned to 1 of the following 2 experimental groups : ( 1 ) teeth endodontically treated and restored with adhesive techniques and composite or ( 2 ) teeth endodontically treated , restored with adhesive techniques and composite , and then restored with full-coverage metal-ceramic crowns .  Sixty teeth were included in the first group and 57 in the second . All restorations were performed by one operator . Causes of failure were categorized as root fracture , post fracture , post decementation , clinical and /or radiographic evidence of marginal gap between tooth and restoration , and clinical and /or radiographic evidence of secondary caries contiguous with restoration margins . Subjects were examined for the listed clinical and radiographic causes of failure by 2 calibrated examiners at intervals of 1 , 2 , and 3 years . Exact 95 % confidence intervals for the difference between the 2 experimental groups were calculated . RESULTS At the 1-year recall , no failures were reported . The only failure modes observed at 2 and 3 years were decementations of posts and clinical and /or radiographic evidence of marginal gap between tooth and restoration . There was no difference in the failure frequencies of the 2 groups ( 95 % confidence interval , -17.5 to 12.6 ) . There was no difference between the number of failures caused by post decementations and the presence of marginal gaps observed in the 2 groups ( 95 % confidence intervals , -9.7 to 16.2 and -17.8 to 9.27 ) . CONCLUSION Within the limitations of this study , the results upheld the research hypothesis that the clinical success rates of endodontically treated premolars restored with fiber posts and direct composite restorations after 3 years of service were equivalent to a similar treatment of full coverage with metal-ceramic crowns BACKGROUND A prospect i ve study was started in 1995 to evaluate the success of carbon fibre reinforced epoxy resin ( CFRR ) posts used to restore endodontically treated teeth . All the teeth in the study had lost more than 50 % of their coronal structure . METHODS Fifty-nine carbon fibre Composiposts cemented with Metabond and built up with Core Paste cores were placed into the teeth of 47 patients . Each tooth received a full-coverage restoration ( porcelain fused to metal crown ) and was followed for 6.7 - 45.4 months ( average = 28.0 months , st and ard deviation = 10.7 ) . RESULTS Results for 52 teeth in 42 patients were analyzed . There were no fractures . The overall failure rate was 7.7 % and the cumulative survival rate was 89.6 % at the end of the follow-up period . The only statistically significant finding ( p = 0.04 ) was that posts in lower premolars were at higher risk of failure . CONCLUSION CFRR posts are among the most predictable systems available today . CFRR posts in the upper anterior teeth are associated with a higher success rate and longer life than those placed in premolars , especially lower premolars . This study contributes to the growing body of evidence that supports the use of CFRR posts in the restoration of endodontically treated teeth STATEMENT OF PROBLEM It is unclear which post and core system performs best when bonded to severely compromised endodontically treated teeth . PURPOSE The purpose of this study was to investigate the fracture resistance and mode of failure of severely compromised teeth restored with 3 different adhesively bonded post and core systems . MATERIAL AND METHODS Thirty extracted endodontically treated maxillary anterior teeth were r and omly divided into 3 groups , CPC , gold cast post and core ; TPC , titanium prefabricated post/composite resin core ; and FPC , quartz fiber reinforced post/composite resin core . All posts were adhesively cemented . All cores resembled a central incisor preparation with no remaining tooth structure above the finish line . Cast gold crowns were fabricated and cemented adhesively . The specimens were aged with thermocycling and cyclic loading . Two specimens per group were r and omly selected for micro-computed tomographic imaging before and after aging . Failure was induced with a universal testing machine . The mode of failure was characterized by the interface separation . Data were analyzed with 1-way ANOVA ( α=.05 ) followed by post hoc tests ( Bonferroni ) . RESULTS A statistically significant difference was found among the 3 groups ( P=.002  ) . CPC was significantly different than TPC ( P=.008 ) or FPC ( P=.003 ) . The primary mode of failure  for CPC and TPC  was root fracture , and for FPC post debonding . CONCLUSIONS Severely compromised endodontically treated teeth restored with bonded gold cast post and cores showed significantly higher fracture resistance AIMS AND METHODS The purpose of this retrospective , non-r and omised cohort study was to evaluate the success rate of 775 endodontically treated teeth depending on the restoration type . A total of 508 patients with 775 endodontically treated teeth were examined during at least 12 months . The radiographic controls , time span between root canal filling and definitive restoration , restoration material type , inserted post system type and the occurrence of possible endodontically as well as restorative post-operative complications were recorded . RESULTS 18.3 % of the 775 investigated teeth were incisors and canines , 33.5 % were premolars and 48.2 % molars . Pre-fabricated and casted metal post systems were used only in 15.6 % of the endodontically treated teeth ( 18.4 % incisors and canines , 44.8 % premolars , 36.8 % molars ) . 6.6 % of the teeth had endodontically related symptoms or severe complications , whereas in 13.2 % of the teeth restored with metal posts showed complications , such as root or crown fractures . The Cox-Regression analysis showed that teeth restored with a post system had a statistically significant higher failure rate ( p = 0.044 ) than those which had been restored without posts . CONCLUSIONS The results showed a high success rate for endodontically treated teeth when the final restoration was placed within a short period of time ( two weeks ) . A higher tooth loss was observed when metal post systems were employed suggesting that pre caution is recommended when these types of posts are inserted Background Early childhood caries discloses a distinct clinical pattern , and the teeth most often involved are the maxillary central incisors , lateral incisors , and the maxillary and man-dibular first molars . The maxillary incisors are most severely affected , with deep carious lesions usually involving the pulp . Teeth that have been endodontically treated often have little coronal tooth tissue remaining and as such require a post to retain the core and restoration .This study evaluated and compared the efficacy of EverStick glass fiber-reinforced composite post with ParaPost Taper Lux in primary maxillary anterior teeth . Aim An in vivo study was conducted to evaluate and compare the longevity and failures of two fiber post systems in primary maxillary anterior teeth . Material s and methods A total of 60 severely mutilated primary maxillary anterior teeth from children aged 3 to 5 years were selected according to the inclusion criteria . These teeth were treated endodontically and were r and omly assigned into two groups with 30 sample s in each group , group I : EverStick glass fiber-reinforced composite post , group II : ParaPost Taper Lux post . The evaluation of dislodgment of posts , secondary caries , root fracture , and post fracture was carried out clinical ly and radiographically during every follow-up at 3 , 6 , 9 , and 12 months interval . Results Statistical tests ( Chi-square test , Fisher ’s exact probability test ) suggested that dislodgment of the posts was significant between the two groups at 6 , 9 , and 12 months follow-ups . But within the group during subsequent follow-up intervals , dislodgment of posts as a mode of failure was not statistically significant . However , clinical ly failures were seen in both the study groups . Conclusion Fiber post system has proved to be successful clinical ly in both primary and permanent teeth due to the mono-block effect with luting agent , post system , core material , and bonding to dentin . Thus , today the EverStick glass fiber post system provides a novel way of fabricating cost-effective and less time-consuming custom-made post in treating mutilated maxillary anteriors . How to cite this article Sawant A , Chunawalla Y , Morawala A , Kanchan NS , Jain K , Talathi R. Evaluation of Novel Glass Fiber-reinforced Composite Technique for Primary Anterior Teeth with Deep Carious Lesions : A 12-month Clinical Study . Int J Clin Pediatr Dent 2017;10(2):126 - 130 PURPOSE To compare by confocal and scanning electron microscopy the post-resin-dentin interfaces of endodontically-treated teeth which had been restored with dentin-bonding systems and composite and needed to be extracted after 6 months to 6 years of clinical service . MATERIAL S AND METHODS Sixteen single rooted teeth showing proximal lesions penetrating the pulp chamber were included in the investigation and divided into two groups . Group 1 teeth were endodontically-treated , restored with carbon fiber posts and resin-based composite . Group 2 teeth were treated in the same way and covered with porcelain fused-to-metal crowns . RESULTS Two thirds of the observed interfaces showed resin penetration of the root dentin in the middle and coronal third of the post space preparation , while only one third of the interface showed resin infiltration in the apical third of the post space preparation . Debonding of the adhesive from the resin infiltrated dentin area and debonding of the composite cement from the adhesive were the most frequently observed failure modes and were observed in one third of the observed interfaces . There was no difference between the post-resin-dentin interfaces of teeth covered and teeth not covered with porcelain-fused to metal crowns . Teeth extracted after longer periods of clinical service showed more abundant areas of debonding of the adhesive from the resin-dentin interdiffusion zone . The presence of bacteria in resin infiltrated dentin tubules was observed in two specimens Clinical evidence is lacking regarding the influence of the amount of residual coronal dentin and of post placement on the failure risk of endodontically compromised teeth . The aim of this prospect i ve clinical trial was to assess whether these factors significantly affect the two-year survival of restored pulpless premolars . A sample of 210 individuals provided six experimental groups of 40 premolars in need of endodontic treatment . Groups were defined based on the amount of dentin left at the coronal level . Within each group , in half of the teeth selected at r and om , a fiber post was inserted inside the root canal , whereas in the remaining half of the premolars , no post was placed . All teeth were covered with a crown . The Cox regression analysis revealed that post placement result ed in a significant reduction of failure risk ( p < 0.001 ) . Failure risk was increased for teeth under the “ no ferrule ” ( p = 0.001 ) and “ ferrule effect ” conditions ( p = 0.004 ) AIM To assess survival rates and complications of  root-filled teeth restored with or without post- and -core systems  over a mean observation period of > or=4 years . METHODOLOGY A total of 325 single- and multirooted teeth in 183 subjects treated in a private practice were root filled and restored with either a cast post- and -core or with a prefabricated titanium post and composite core . Root-filled teeth without post-retained restorations served as controls . The restored teeth served as abutments for single unit metal-ceramic or composite crowns or fixed bridges . Teeth supporting cantilever bridges , overdentures or telescopic crowns were excluded . RESULTS Seventeen teeth in 17 subjects were lost to follow-up ( 17/325 : 5.2 % ) . The mean observation period was 5.2 + /- 1.8 ( SD ) years for restorations with titanium posts , 6.2 + /- 2.0 ( SD ) years for cast post- and -cores and 4.4 + /- 1.7 ( SD ) years for teeth without posts . Overall , 54 % of build-ups included the incorporation of a titanium post and 26.5 % the cementation of a cast post- and -core . The remaining 19.5 % of the teeth were restored without intraradicular retention . The adjusted 5-year tooth survival rate amounted to 92.5 % for teeth restored with titanium posts , to 97.1 % for teeth restored with cast post- and -cores and to 94.3 % for teeth without post restorations , respectively . The most frequent complications included root fracture ( 6.2 % ) , recurrent caries ( 1.9 % ) , post-treatment periradicular disease ( 1.6 % ) and loss of retention ( 1.3 % ) . CONCLUSION Provided that high- quality root canal treatment and restorative protocol s are implemented , high survival and low complication rates of single- and multirooted root-filled teeth used as abutments for fixed restorations can be expected after a mean observation period of > or=4 years PURPOSE This controlled clinical trial aim ed to compare the 3-year outcomes of glass fiber posts and composite cores with gold alloy-based posts and cores for the restoration of endodontically treated teeth . MATERIAL S AND METHODS One hundred forty-four patients in need of 205 restorations on endodontically treated teeth were selected and followed for 7 to 37 months ( mean : 21 ± 9 months ) . The teeth were primarily stratified based on the remaining tissue available to restore the tooth core with or without a post . Then , r and omization allocated the teeth to either test group 1 ( prefabricated glass fiber posts ) , test group 2 ( custom-made glass fiber posts ) , or test group 3 ( composite cores without posts ) . The control group consisted of gold alloy-based posts and cores . All posts/cores were covered with all-ceramic single crowns .  Failures were either absolute , such as root fractures or irreparable fractures of the post/core , or relative , such as loss of post retention or reparable fractures of the core . Success and survival probability lifetime curves , corrected for clustering , were drawn for the entire data set . RESULTS The recall rate at 3 years was 97.1 % . Absolute failures consisted of two root fractures and one endodontic failure , while relative failures included three instances of retention loss of the post/core and one post fracture . Because of the low number of events , no statistical tests were performed . The success and survival probabilities over all groups together at 3 years amounted to 91.7 % and 97.2 % , respectively . CONCLUSIONS After being followed for up to 3 years , both cast gold and composite post and core systems performed well clinical ly . Longer follow-up times are needed to detect possible significant differences . Int J Prosthodont 2011;24:363 - 372 INTRODUCTION The aim of this r and omized clinical trial was to assess whether the placement of a fiber post ( DT Light Post ) ( DT ) and the amount of residual coronal dentin affect the time to failure of single-unit postendodontic restorations . METHODS Ninety patients providing 120 teeth were selected . Three groups ( n = 40 ) were defined on the basis of the amount of residual coronal dentin : 2-walls group , 2 or more coronal walls ; 1-wall group , 1 coronal wall ; no-wall group , no wall exceeding 2 mm above the gingival level . Within each group teeth were r and omized and allocated to 2 intervention groups ( n = 20 ) , including subgroups no post ( no root canal retention ) and subgroups post ( placement of DT ) . RESULTS After a mean observation period of 32.4 ( 13.7 ) months in subgroups no post , the failure rates were 10 % , whereas in subgroups post , failure rates of 7 % were observed ( P = .318 ) . In no-wall group post placement significantly affected the time to failure of total restorations ( P = .029 , log-rank test ) . Teeth without post retention revealed a significantly higher failure rate ( 31 % ) compared with teeth restored with post retention ( 7 % ) . CONCLUSIONS Within the observation time of the present study , fiber post placement was efficacious to reduce failures of postendodontic restorations only with teeth that exhibited no coronal walls . Post insertion for teeth showing a minor substance loss should be critically reconsidered The purpose of this study was to evaluate the relationship of the quality of the coronal restoration and of the root canal obturation on the radiographic periapical status of endodontically treated teeth . Full-mouth radiographs  from r and omly selected new patient folders at Temple University Dental School were examined . The first 1010 endodontically treated teeth restored with a permanent restoration were evaluated independently by two examiners . Post and core type restorations were excluded . According to a predetermined radiographic st and ard set of criteria , the technical quality of the root filling of each tooth was scored as either good ( GE ) or poor ( PE ) , and the quality of the coronal restoration similarly good ( GR ) or poor ( PR ) . The apical one-third of the root and surrounding structures were then evaluated radiographically and the periradicular status categorized as ( a ) absence of periradicular inflammation ( API ) or ( b ) presence of periradicular inflammation ( PPI ) . The rate of API for all endodontically treated teeth was 61.07 % . GR result ed in significantly more API cases than GE , 80 % versus 75.7 % . PR result ed in significantly more PPI cases than PE , 30.2 % versus 48.6 % . The combination of GR and GE had the highest API rate of 91.4 % , significantly higher than PR and PE with a API rate of 18.1 % PURPOSE This prospect i ve clinical follow-up evaluated the acceptability of quartz fiber-reinforced epoxy posts used in endodontically treated teeth over a 30-month period . MATERIAL S AND METHODS In 132 patients , 180 endodontically treated teeth were restored using AEstheti-Plus quartz-fiber posts . The posts were luted with the All-Bond 2 adhesive system and C&B Resin Cement according to the manufacturer 's recommendations . The core was made with Core-Flo or Bis-Core , and all-ceramic crowns or metal-ceramic crowns were applied as final restorations . The parameters considered as clinical failure were displacement , detachment , or fracture of posts ; core or root fracture ; and crown or prosthesis decementation . Patients were reevaluated at 6 , 12 , 24 , and 30 months . RESULTS One cohesive failure involving a margin of the composite core was observed after 2 weeks , and two adhesive fractures were seen after 2 months . These failures were located between the cement and the dentin walls of the canals . All three failures occurred during removal of the temporary crown . The percentage of failures was thus 1.7 % over a 30-month period , but it was possible to successfully replace the restoration in all three failed cases . CONCLUSION Over a 30-month period , the rehabilitation of endodontically treated teeth using quartz-fiber posts showed good clinical results . No crown or prosthesis decementation was observed , and no post , core , or root fractures were recorded Objective : Bacterial leakage and root fractures are the most important reasons of root canal treatment failure . Due to the lack of adhesion of gutta percha to the canal walls , Resilon has been introduced as a root-filling material able to bond to the root walls . Metal posts may predispose the tooth walls to oblique and vertical fracture which usually leads to tooth loss ; whereas , fiber posts may reinforce the remaining tooth structure . The purpose of this study was to compare the effect of Resilon and gutta-percha on the fracture resistance of root canal following restoring with quartz fiber posts . Material s and Methods : Forty-four maxillary incisor root canals were chemo-mechanically prepared , then r and omly divided into three groups : 1-Control group ( n=20 ) , 2-Experimental group ( n=20 ) and a negative control group ( n=4 ) . Root filled teeth were restored with quartz fiber posts and composite resin cores .  Four teeth with a conservative prepared access cavities and without any further post preparation were used as a negative control group . After simulating the clinical situation , specimens were loaded in the Universal Testing Machine for compressive strength test . All data were statistically analyzed by the T-test . Results : The mean compressive strengths for group 1 was 535.8 ± 155.23 N and 645.93 ± 182.98N for group 2 , which were statistically significant ( p-value= 0.047 ) . Conclusion : Root canals filled with Resilon were significantly more resistant than that of gutta-percha , following restoration with quartz fiber posts PURPOSE The aim of this prospect i ve r and omized controlled trial was to evaluate the influence of clinical baseline characteristics on the survival of 2 post systems . MATERIAL S AND METHODS One hundred patients needing a post were included . Half the patients received a glass fiber-reinforced post ( FRP ) , and the other half received metal screw posts ( MSP ) . The posts were assigned r and omly . In addition to demographic data , the following parameters were recorded : type of tooth ( incisor/canine versus molar/premolar ) , length of the post in relation to root length ( percentage ) , extent of coronal tooth destruction ( percentage ) , ferrule height ( in millimeters ) , type of restoration ( fixed or removable partial denture ) , and presence of antagonistic contacts ( yes/no ) . After at least 1 year ( mean : 13.84 months ) , the patients were recalled . Statistical analysis was performed using the log-rank test and Cox regression analysis . RESULTS The survival rate of FRPs was 93.5 % . In the MSP group , the survival rate was significantly lower ( 75.6 % ; log-rank test , P = .049 ) . Additionally , the metal posts were associated with more unfavorable complications , for example , root fracture . The type of the tooth and the degree of coronal tooth destruction influenced the survival of MSPs , whereas no influence of these variables could be seen for FRPs . CONCLUSION FRPs are superior to MSPs with respect to short-term clinical performance . Especially for MSPs , clinical survival depends on several variables INTRODUCTION The aim of this in vitro study was to evaluate the influence that resin composite and porcelain veneer restorations , associated or not to fiber post placement , have on fracture resistance and deflection of pulpless anterior teeth .  METHODS One hundred twenty freshly extracted human maxillary central incisors were selected . Teeth were r and omly divided into 7 experimental groups ( veneer preparation/resin composite veneer placement/endodontic therapy and resin composite veneer placement/endodontic therapy , fiber post and resin composite veneer placement/porcelain veneer placement/endodontic therapy and porcelain veneer placement/endodontic therapy , fiber post and porcelain veneer placement ) and a control group ( n = 15 ) . Specimens were loaded to fracture recording crown deflection , and data were statistically analyzed . RESULTS Veneer preparations did not significantly influence fracture resistance of incisors . On the contrary , veneer preparation significantly increased specimen deflection values .  Fiber posts seemed to significantly increase mean maximum load values for endodontically treated teeth restored with either composite or porcelain veneers . CONCLUSIONS A fiber post restoration can be suggested when endodontic treatment is associated with veneer restoration . Veneer restorations seem to be an optimal choice also for endodontically treated teeth PURPOSE This study compares the survival rate and fracture strength of endodontically treated maxillary incisors with moderate coronal defects restored with different post- and -core systems after exposure to an artificial mouth . MATERIAL S AND METHODS Sixty-four caries-free human maxillary central incisors were selected for st and ardized size and quality , endodontically treated , and decoronated 2 mm coronal to the cementoenamel junction . Group 1 was restored with titanium posts and composite cores , group 2 received zirconia posts and a composite core , and in group 3 zirconia posts with a heat-pressed ceramic core were used . Teeth restored with cast posts and cores served as controls . All teeth were prepared and restored with complete cast crowns . All sample s were exposed to 1.2 million cycles in a computer-controlled chewing simulator with simultaneous thermocycling . In addition , the sample s were loaded until fracture in a static testing device . RESULTS The survival rates of the different groups were : 94 % for titanium/composite , 63 % for zirconia/composite , 100 % for the all-ceramic post and core , and 94 % for the cast post and core . The following mean fracture strengths were obtained : titanium/composite = 425 + /- 155 N , zirconia/composite = 202 + /- 212 N , zirconia/ceramic = 378 + /- 64 N , cast post and core = 426 + /- 178 N. The lower fracture load in the group with zirconia posts and composite cores was statistically significant . The use of zirconia posts result ed in fewer oblique root fractures . CONCLUSION Prefabricated titanium posts with composite cores , zirconia posts with heat-pressed ceramic cores , and cast posts and cores yield comparable survival rates and fracture strengths for the restoration of crowned maxillary incisors with moderate coronal defects .  Survival rates and fracture strengths for zirconia posts with composite cores are significantly lower , so this combination can not be recommended for clinical use Prospect i ve clinical studies comparing the results of different types of restorations of endodontically treated teeth are lacking . This study compared the clinical success rate of endodontically treated premolars restored with fiber posts and direct composite to the  restorations of premolars using amalgam . Premolars with Class II carious lesions were selected and r and omly assigned to one of two experimental groups : ( 1 ) restoration with amalgam or ( 2 ) restoration with fiber posts and composite .  One hundred and nine teeth were included in Group 1 and 110 in Group 2 . Patients were recalled after 1 , 3 and 5 years . No statistically significant difference was found between the proportion of failed teeth in the two experimental groups . Significant differences were observed between the proportion of root fractures ( p=0.029 ) and caries ( p=0.047 ) , with more root fractures and less caries observed in the teeth restored with amalgam at the five-year recall . Within the limits of this study , it can be concluded that restorations with fiber posts and composite were found to be more effective than amalgam in preventing root fractures but less effective in preventing secondary caries Objective Considering that periodontal ligament simulation may influence the stress distribution over teeth restored with intraradicular retainers , this study aim ed to assess the combined effect of mechanical cycling and periodontal ligament simulation on both the bond strength between fiber posts and root dentin and the fracture resistance of teeth restored using glass fiber posts . Material and Methods Ninety roots were r and omly distributed into 3 groups ( n=10 )  ( C-MC : control ; P-MC : polyether ; AS-MC : addition silicone ) to test bond strength and 6 groups ( n=10 )  ( C : control ; P : polyether ; AS : addition silicone , without mechanical cycling , and C-MC , P-MC and AS-MC with mechanical cycling ) to test fracture strength , according to the material used to simulate the periodontal ligament . For the bond strength test , fiber posts were cemented , cores were built , mechanical cycling was applied ( 2 × 106 cycles , 88 N , 2.2 Hz , and 45º incline ) , and the teeth cut into 3 slices ( 2 mm ) , which were then subjected to the push-out test at 1 mm/min . For the fracture strength test , fiber posts were cemented , cores were built , and half of the groups received mechanical cycling , followed by the compressive strength ( 45 ° to the long axis and 1 mm/min ) performed on all groups . Results Periodontal ligament simulation did not affect the bond strength ( p=0.244 ) between post and dentin . Simulation of periodontal ligament ( p=0.153 ) and application of mechanical cycling ( p=0.97 ) did not affect fracture resistance . Conclusions The material s used to simulate the periodontal ligament did not affect fracture or bond strength , therefore periodontal ligament simulation using the tested material s could be considered optional in the conditions of the study PURPOSE To determine , in a 3-year clinical trial , whether tooth type and ferrule significantly affect the survival of pulpless teeth restored with fiber posts . METHODS A sample of 87 teeth in 87 patients ( 32 men and 55 women , age ranged from 23 to 78 ) were restored using Snowpost : 34 incisors , 12 canines , 25 premolars and 16 molars . The posts were cemented with RelyXUnicem and the core was made with a resin composite ( Dentocore Automix ) . Every tooth was covered with a metal-ceramic or all ceramic crown . Two experimental groups , according to the presence or absence of ferrule , were defined : A ) 45 teeth with ferrule ( > 2 mm height ) ; and B ) 42 teeth without ferrule ( < 2 mm height ) . Patients were reevaluated every 6 months . RESULTS 14 of the total restorations failed ( 16.1 % ) . The failure modes were caries ( n=4 ) , post fracture ( n=4 ) , root fracture ( n=2 ) , and marginal gap , post cement failure , crown cement failure , and periapical lesion ( n= 1 respectively ) . In Group A the failure observed was 6.67 % and in Group B it was 26.20 % . The log-rank test showed statistically significant differences between both groups . According to the type of tooth , the incisors were the teeth with the highest failure rate ( 73.52 % ) , but Chi-square test showed no statistically significant differences among the four tooth types , perhaps because of the low number of the sample Glass fiber-reinforced endodontic posts are considered to have favorable mechanical properties for the reconstruction of endodontically treated teeth . The aim of the present investigation was to evaluate the survival of two tapered and one parallel-sided glass fiber-reinforced endodontic post systems in teeth with different stages of hard tissue loss and to identify risk factors for restoration failure . One-hundred and forty-nine glass fiber-reinforced endodontic posts in 122 patients were followed-up for 5 - 56 months [ mean + /- st and ard deviation ( SD ) : 39 + /- 11 months ] . Glass fiber-reinforced endodontic posts were adhesively luted and the core was built with a composite resin .  Cox proportional hazards models were used to evaluate the association of clinical variables and failure rate . Higher failure rates were found for restorations of anterior teeth compared with posterior teeth [ Hazard-Ratios ( HR ) : 3.1 ; 95 % confidence interval ( CI ) : 1.3 - 7.4 ] , for restorations in teeth with no proximal contacts compared with at least one proximal contact ( HR : 3.0 ; 95 % CI : 1.0 - 9.0 ) , and for teeth restored with single crowns compared with fixed bridges ( HR : 4.3 ; 95 % CI : 1.1 - 16.2 ) . Tooth type , type of final restoration and the presence of adjacent teeth were found to be significant predictors of failure rates in endodontically treated teeth restored with glass fiber-reinforced endodontic posts
The results of this study did not show significant differences for root fracture incidence between metal- and fiber posts .
INTRODUCTION Teeth requiring endodontic treatment commonly have compromised a coronal tooth structure that often requires the use of an intraradicular post to retain the coronal restoration .
Although usually successful , catastrophic failures requiring extraction have been reported in the literature .
The aim of this systematic review was to analyze clinical trials and cohort studies that evaluated the incidence rate of root fractures in post-retained restorations .
The hypothesis was that the incidence rate related to the use of metal posts was higher than that of fiber posts .