Clinical outcome of three-unit lithium-disilicate glass-ceramic fixed dental prostheses: up to 8 years results. Risk factors for failure of glass fiber-reinforced composite post restorations: a prospective observational clinical study. Ten-year survival and complication rates of lithium-disilicate (Empress 2) tooth-supported crowns, implant-supported crowns, and fixed dental prostheses. Clinical performance of all-ceramic cantilever fixed dental prostheses: results of a 2-year randomized pilot study. Fracture resistance and deflection of pulpless anterior teeth restored with composite or porcelain veneers. Clinical evaluation of all-ceramic posterior three-unit FDPs made of In-Ceram Zirconia.
OBJECTIVES The purpose of this prospect i ve study was to evaluate the clinical outcome of  crown-retained fixed dental prostheses ( FDPs ) made  from a lithium-disilicate glass-ceramic ( IPS e.max Press , Ivoclar-Vivadent ) . METHODS Thirty-six three-unit FDPs were placed in 28 patients . The FDPs replaced teeth in the anterior ( 16 % ) and posterior ( 84 % ) regions . All teeth were prepared following a st and ardized protocol . The size of the proximal connector of the FDPs was 12 mm2 ( anterior ) or 16 mm2 ( posterior ) . FDPs were cemented either with glass-ionomer cement ( n=19 ) or composite resin ( n=17 ) . The following parameters were evaluated at baseline , 6 months after cementation and then annually ( at abutment and contralateral teeth ) : probing pocket depth , plaque index , bleeding on probing , and tooth vitality . RESULTS Three FDPs were defined as drop-out . The mean observation period of the remaining 33 FDPs was 86 months ( range : 67 - 98 months ) : two FDPs in two patients had to be replaced ( 6 % ) because of fractures . The 8-year survival rate according to Kaplan-Meier was 93 % . In addition , chipping of the veneering material was found in two FDPs ( 6 % ) . Two abutments ( 3 % ) of two restorations had to be treated endodontically ; and two FDPs ( 6 % ) lost retention and had to be recemented . These complications did not affect the function of the involved restorations clinical ly . There were no significant differences between the periodontal parameters of the test and control teeth . SIGNIFICANCE Short-span crown-retained three-unit FDPs made from lithium-disilicate glass-ceramic can be used clinical ly irrespective of an adhesive or conventional cementation 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 OBJECTIVES To prospect ively evaluate the clinical long-term outcome of  tooth-supported crowns ( SCs ) , implant-supported crowns ( ISCs ) , and fixed dental prostheses ( FDPs )  made of a lithium-disilicate glass-ceramic framework material ( IPS Empress 2 ) . MATERIAL S AND METHODS Between 1997 and 1999 , a total of 184 restorations ( 106 SCs , 32 ISCs , 33 FDPs , and 13 diverse restorations ) were placed in 73 patients .  Kaplan-Meier estimation was applied for survival and chipping-free rates . Inter-group comparison of both rates was realized by a log rank test and a 2 × 2 contingency table . Also , SCs and FDPs were compared regarding adhesive vs. conventional cementation , and anterior vs. posterior positioning , for impact on survival . RESULTS Due to 14 dropouts ( 34 restorations ) and reasonable exclusion of 19 other restorations , the final data set included : i ) 87 SCs [ 37 patients , mean observation time 11.4 (±3.8)years ] ; ii ) 17 ISCs [ 12 patients , mean observation time 13.3 (±2.3)years ; and iii ) 27 FDPs [ 19 patients , mean observation time 8.9 (±5.4)years ] . The 10-year survival rate/chipping-free rate for SCs were 86.1%/83.4 % , for ISCs 93.8%/94.1 % , and for FDPs were 51.9%/90.8 % . Both ISCs and SCs had a significantly higher survival than FDPs ( ISCs vs. FDPs : both tests p=0.001 ; SCs vs. FDPs : p=0.001 and p=0.005 ) . Differences in the chipping-free rates did not reach significance . Also , neither the cementation mode nor positioning of the restoration had an impact on survival . CONCLUSIONS SCs had a slightly lower outcome than can generally be expected from single crowns . In contrast , ICSs had a favorable outcome and the FDPs predominantly failed . CLINICAL SIGNIFICANCE The practitioner 's choice of dental material s is based ( at best ) on long-term experience . The present 10-year results are based on comprehensive data analyses and show the high potential of lithium-disilicate as a reliable material , especially for single-unit restoration OBJECTIVE To evaluate the clinical performance of zirconia-based cantilever fixed dental prostheses ( FDPs ) . METHOD AND MATERIAL S Twenty-one cantilever FDPs with three or four units were design ed to replace one premolar or incisor ( no canines ) . The FDPs were divided into 11 zirconia cantilever FDPs ( test group ) and 10 metal-ceramic cantilever FDPs ( control group ) and r and omly assigned to patients . The results documented included failures , complications , plaque accumulation , and esthetic performance . Statistical analysis was performed using the Mann-Whitney U and chi-square tests . RESULTS During the 2-year observation period , a total of five clinical ly relevant complications in four patients occurred : three endodontic problems ( two in the test group and one in the control group ) and two veneer chippings ( both in the test group ) . Plaque accumulation on the abutment teeth was not significantly different among groups . The esthetic performance of all FDPs was acceptable . CONCLUSION Stability and esthetic performance were acceptable for all-ceramic cantilever FDPs fabricated with zirconia . A longer observation period and larger sample size are necessary to make valid predictions about the longevity of these restorations 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 This prospect i ve study evaluated the clinical outcome of three-unit posterior fixed dental prostheses ( FDPs ) made of In-Ceram Zirconia . All 65 FDPs were inserted at the Department of Prosthodontics , School of Dentistry , Kiel , Germany , and cemented with glass-ionomer cement .  Follow-ups were performed annually . During a mean observation time of 54.4 months , two FDPs failed ( one technical and one biologic failure ) . Two FDPs debonded and the veneering ceramic fractured in four cases . Three abutment teeth needed endodontic treatment and two additional abutment teeth exhibited secondary caries . Results suggest that posterior three-unit all-ceramic FDPs made from In-Ceram Zirconia may be a viable prosthetic treatment option with an outcome comparable to metal-ceramic FDPs
Conclusions The most frequently reported failures in the available studies were as follows : fiber post debonding , loss of retention of single crowns , and marginal gaps .
Less frequently , chippings and fractures were recorded in SCs .
Objective The present systematic review aim ed at assessing data from the literature on endodontic and prosthetic complications in endodontically treated teeth restored with fiber posts and single crowns ( SCs ) or fixed dental prostheses ( FDPs ) .