Prospective assessment of CAD/CAM zirconia abutment and lithium disilicate crown restorations: 2.4 year results. Prospective study of zirconia-based restorations: 3-year clinical results. Retrospective clinical study of single-retainer cantilever anterior and posterior glass-ceramic resin-bonded fixed dental prostheses at a mean follow-up of 6 years. Clinical survival of indirect, anterior 3-unit surface-retained fibre-reinforced composite fixed dental prosthesis: Up to 7.5-years follow-up. A 5-year prospective study of single-tooth replacements supported by the Astra Tech implant: a pilot study. 10-year clinical outcomes of fixed dental prostheses with zirconia frameworks. Clinical evaluation of root filled teeth restored with or without post-and-core systems in a specialist practice setting. Randomized Controlled Clinical Trial of All-Ceramic Single Tooth Implant Reconstructions Using Modified Zirconia Abutments: Radiographic and Prosthetic Results at 1 Year of Loading. Technical and biological complications/failures with single crowns and fixed partial dentures on implants: a 10-year prospective cohort study. Survival rate of endodontically treated teeth in relation to conservative vs post insertion techniques -- a retrospective study.
STATEMENT OF PROBLEM  Single-tooth implant restorations  are commonly used to replace anterior maxillary teeth . The esthetic , functional , and biologic outcomes are , in part , a function of the abutment and crown . PURPOSE The purpose of this clinical study was to describe the implant , abutment , and crown survival and complication rates for CAD/CAM zirconia abutment and lithium disilicate crown restorations for single-tooth implants . MATERIAL AND METHODS As part of a broader prospect i ve investigation that enrolled and treated 141 participants comparing tissue responses at the conical interface ( CI ; AstraTech OsseoSpeed ) , flat-to-flat interface ( FI ; NobelSpeedy ) , and platform-switch interface ( PS ; NanoTite Certain Prevail ) of single-tooth implants  , computer-aided design and computer-aided manufacturing ( CAD/CAM ) zirconia abutments ( ATLANTIS Abutment ) and cemented lithium disilicate ( e.max ) crowns were used in the restoration of all implants . After 2.4 years in function ( 3 years after implant placement ) , the implant , abutment , and crown of 110 participants were evaluated . Technical and biologic complications were recorded . Demographic results were tabulated as percentages with mean values and st and ard deviations . Abutment survival was calculated with the Kaplan-Meier method . RESULTS After 2.4 years , no abutments or crowns had been lost . Abutment complications ( screw loosening , screw fracture , fracture ) were absent for all 3 implant groups . Crown complications were limited to 2 crowns debonding and 1 with excess cement ( 2.5 % ) . Five biological complications ( 4.0 % ) were recorded . The overall complication rate was 6.5 % . CONCLUSIONS CAD/CAM zirconia abutments restored with cemented lithium disilicate crowns demonstrated high survival on 3 different implant-abutment interface design s. No abutment or abutment screw fracture occurred . The technical complications observed after 2.4 years were minor and reversible . The use of CAD/CAM zirconia abutments with cemented lithium disilicate crowns is associated with high technical and biologic success at 2.4 years OBJECTIVES To evaluate  fixed dental prostheses ( FDPs ) and single crowns made of zirconia substructures veneered with new fluorapatite veneering porcelain . METHOD AND MATERIAL S Thirty-eight patients received 18 FDPs and 50 single crowns . Zirconia substructures were fabricated by a CAD/CAM system and veneered using the powder buildup technique . All restorations were cemented with glass ionomer . Baseline evaluation was performed 2 weeks after cementation with recall examinations at 12 , 24 , and 36 months by calibrated investigators . SEM was performed on replicas of all restorations . Survival probabilities according to Kaplan-Meier were calculated . RESULTS The mean service time was 35 ( + /- 14 ) months . After 3 years of clinical service , three biologic and five technical failures were recorded . All failures occurred in the FDP group . One FDP was removed after biologic failure of one abutment tooth . The Kaplan-Meier survival probability was 88.2 % after 35 months for all types of failures and 98.5 % concerning restorations in service . The type of restoration showed significant influence on the survival probability ( P < .001 , log-rank test ) . No influence on gingival parameters from the restorations was observed compared to control teeth . CONCLUSIONS Zirconia substructures veneered with fluorapatite veneering porcelain seem to be a reliable treatment option . More research has to be conducted to investigate differences between single crowns and FDPs PURPOSE To retrospectively evaluate the 6-year survival rates and technical/ biologic complication rates of single-retainer glass-ceramic resin-bonded fixed dental prostheses ( RBFDPs ) .  MATERIAL S AND METHODS Forty patients with 49 anterior/posterior glass-ceramic RBFDPs were included . The RBFDPs  replaced 11 maxillary/m and ibular central incisors , 18 lateral incisors , 18 premolars , and 2 molars . Patients willing to participate were clinical ly and radiologically examined . The technical outcome was assessed with modified United States Public Health Service criteria . Fracture and /or chipping of the restoration , occlusal wear , marginal adaptation , marginal discoloration , shape , surface texture , and esthetic integration were recorded . Tooth vitality and postoperative sensitivity were tested . The following biologic parameters were assessed at test and control teeth : probing pocket depth , gingival recession , attachment loss , bleeding on probing , furcation involvement , and periodontal mobility . Statistical analysis was performed with exact 95 % confidence intervals to relative frequencies and the paired t test . RESULTS Twenty-eight patients with 35 RBFDPs participated . The mean follow-up of the RBFDPs was 6 years . Twelve patients with 14 RBFDPs were not willing to participate or not available . No catastrophic failures occurred . The 6-year survival rate of the examined RBFDPs was 100 % . No debonding was recorded . Chipping of the ceramic was found in 5.7 % of the RBFDPs . Biologic outcomes were similar at test and control teeth . CONCLUSION Glass-ceramic RBFDPs exhibited promising clinical outcomes in both anterior and posterior regions OBJECTIVES This prospect i ve clinical study evaluated the performance of indirect , anterior , surface-retained , fibre-reinforced-composite restorations ( ISFRCR ) . METHODS Between June-2003 and January-2011 , a total of 134 patients ( 83 females , 51 males , 16 - 68 years old ) received 175 ISFRCRs ( local ethical registration number : 14/9/4 ) . All restorations were made indirectly on a plaster model using unidirectional E-glass fibres ( everStick C&B , StickTech ) in combination with a laboratory resin composite ( Dialogue , Schütz Dental ) and cemented according to the instructions of 4 resin cements [ ( RelyX ARC , 3M-ESPE , n=61 ) , Bifix DC , VOCO , n=45 ) , Variolink II ( Ivoclar Vivadent , n=32 ) and Multilink ( Ivoclar Vivadent , n=37 ) ] . After baseline recordings , patients were followed at 6 months and thereafter annually up to 7.5 years . The evaluation protocol involved technical ( chipping , debonding or fracture of tooth/restoration ) and biological failures ( caries ) . RESULTS Mean observation period was 58 months . Altogether , 13 failures were observed [ survival rate : 97.7 % ] ( Kaplan-Meier ) . One catastrophic fracture [ ( cement : RelyX ARC ) , eight partial debonding ( cement : Bifix DC ( 5 ) , Multilink ( 1 ) , RelyX ARC ( 1 ) , Variolink II ( 1 ) ] and four delaminations of veneering composite [ ( cement : Bifix DC ( 2 ) , RelyX ARC ( 1 ) , Multilink ( 1 ) ] were observed . Except one replacement , all defective restorations were repaired or recemented . Annual failure rate of ISFRCRs was 1.73 % . The survival rates with the four resin cements did not show significant differences ( RelyX ARC : 98.3 % ; Bifix DC : 93.5 % ; Variolink 2 : 100 % ; Multilink : 100 % ) ( p=0.114 ) . Secondary caries did not occur in any of the teeth . CONCLUSION The 3-unit anterior indirect surface-retained resin-bonded FRC FDPs showed similar clinical survival rate when cemented with the resin cements tested . Experienced failures in general were due to debonding of the restoration or delamination of the veneering composite . CLINICAL SIGNIFICANCE 3-unit surface retained resin-bonded FRC FDPs could be considered minimal invasive and cost-effective alternatives to conventional tooth- or implant-borne FDPs .  Failures were mainly repairable in the form of chipping or debonding depending on the resin cement type BACKGROUND Implant-supported single-tooth replacements are an increasingly used method to replace teeth , especially in young patients . Therefore , long-term validation of different treatment modalities with different implant systems is of great importance . PURPOSE The aim of the present study was to make a biologic , technical , and aesthetic evaluation of single-tooth replacement supported by the Astra Tech implant ( Astra Tech AB , Mölndal , Sweden ) during a 5-year period . MATERIAL S AND METHODS Twenty patients were divided into two consecutively treated groups . In group A the implants were placed " early " in the extraction sockets , and st and ard single-tooth abutments were used . In group B the implants were placed " delayed , " and preparable abutments were used . Clinical examinations including registration of plaque , bleeding , crown lengths , soft tissue marginal level , papilla height , complications , and radiography were performed yearly . At the 3-year control examination the patient and a dentist evaluated aesthetic appearance with a visual analog scale . RESULTS An implant survival rate of 100 % and a crown survival rate of 95 % over a period of 5 years were found . The mean loss of marginal bone adjacent to implants and neighboring teeth was less than 0.5 mm during the 5-year period , and there was no significant difference after crown placement between the treatment modality for group A and that for B. There were fewer clinical complications and repairs in group B than in group A. Soft tissue dimensions were more natural around implant crowns in group B as compared to group A , but this was not reflected in the patients ' satisfaction with aesthetic appearance . On the other h and the dentist judged the restorations in group B higher concerning aesthetics than in group A. CONCLUSION Implant-supported single-tooth replacement with the Astra Tech system is a reliable treatment result ing in a good 5-year prognosis and only few complications OBJECTIVES The aim of this prospect i ve clinical study was to assess the long-term clinical survival rate and the technical and biological complication rates of  zirconia-based posterior FDPs .  MATERIAL S AND METHODS Forty-five patients in need of one or more posterior FDPs received 57 three- to five-unit zirconia-based FDPs .  The frameworks were fabricated by means of a prototype computer-aided manufacturing ( CAM ) system ( direct ceramic machining , DCM ) , first processing zirconia in the white stage . The frameworks were veneered with a prototype veneering ceramic . The FDPs were adhesively placed . At baseline , 6 months , and 1,2 , 3 , 5 , 8 and 10 years of function , the FDPs were examined for technical and /or biological complications . Furthermore , the periodontal health of the abutment teeth ( test ) and untreated control teeth was analyzed . Statistical analysis was performed applying descriptive statistics , Kaplan-Meier survival and multiple mixed effects regression tests . RESULTS Twenty-one patients with 26 FDPs were examined at a mean observation time of 10.7 + /- 1.3 years . A total of 16 FDPs were lost to follow-up . Fifteen FDPs had to be replaced due to technical/biological complications ; hence , the 10-year survival rate of the FDPs was 67 % . Three framework fractures occurred , result ing in a 10-year survival rate for the zirconia frameworks of 91.5 % . Chipping/fracture of the veneering ceramic was detected in 16 FDPs over 10 years ( complication rate 32 % ) . A significant correlation of the span of the FDPs and the incidence of chipping was observed : 4- and 5-unit FDPs had a 4.9 times higher probability for chipping than 3-unit FDPs . Marginal discrepancy/degradation was found in 90.7 % of the FDPs over 10 years . At 11 of the FDPs ( complication rate 27 % ) , secondary caries occurred . No difference of the periodontal health was found around test and control teeth . CONCLUSION The zirconia frameworks exhibited very good long-term stability . However , the zirconia-based FDPs frequently exhibited problems such as marginal deficiency or chipping of the veneering ceramic . Both problems may be associated with the prototype status of the system 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 study aims to test whether or not veneering of the submucosal part of zirconia abutments with pink dental ceramic affects radiographic and technical outcomes of implant-supported single crowns ( ISSC ) . MATERIAL S AND METHODS Single tooth implants were r and omly restored with either pink-veneered zirconia abutments ( test ; n = 10 ) or non-veneered zirconia abutments ( control group ; n = 10 ) and all-ceramic crowns .  At baseline ( crown insertion ) , and 6- and 12-month radiographic and technical evaluations were performed including st and ardized x-rays and modified United States Public Health Service criteria ( technical ) . Survival and complication rates were assessed for implants and restorations . Robust linear mixed model analysis was performed to investigate the effect of group and time-point on radiographic outcomes . RESULTS At 1 year , the survival rate for implants was 100 % and 95 % for ISSC . Most of the implants were placed subcrestally . Therefore , mean marginal bone levels decreased in both groups between implant insertion and baseline ( p < .05 ) , but then remained stable up to 1 year ( test : 0.15 mm ± 0.42 mm ; control 0.23 mm ± 0.63 mm ) ( p > .005 ) . At 6 months , one minor chipping occurred in the test group . At 1 year , three crowns ( control ) exhibited occlusal roughness . In addition , one abutment fracture occurred ( test ) . The differences between test and control group were not statistically significantly different for any of the evaluated outcome measures ( p > .05 ) . CONCLUSIONS Veneering of the submucosal part of zirconia abutments did not affect biological and technical outcomes of ISSCs . Technical complications of the reconstructions , however , were frequent , result ing in a rate of 75 % of the crowns being complication free OBJECTIVES To assess prospect ively over 10 years the incidences of technical and /or biological complications and failures occurring in a cohort of consecutive partially edentulous patients with fixed reconstructions on implants of the ITI Dental Implant System . METHODS Eighty-nine patients were available , 34 ( 38.2 % ) were male , 55 ( 61.8 % ) were female . At the 10-year examination ( range 8 - 12 years ) , they were 58.9 years old ( range 28 - 88 years ) . RESULTS Single crowns ( SC ) : 48 patients had been restored with 69 SC on 69 implants . Five of the implants with the crowns were lost because of biological failures . Two crowns ( 2.9 % ) were remade because of technical failures . Total failure amounted to seven ( 10 % ) . Implant borne fixed partial dentures ( I-I FPD ) : In 29 patients who had been restored with 33 implant borne suprastructures , the total number of failed I-I FPD was 2 ( 6.1 % ) . Tooth-implant borne fixed partial dentures ( I-T FPD ) : In 21 patients , 22 mixed tooth-implant borne reconstructions were constructed . The number of failed FPD reached 7 ( 31.8 % ) . Statistically significantly fewer biological failures occurred with I-I FPD compared with the I-T FPDs ( ANOVA , Bonferroni , P=0.022 ) . The I-T FPDs experienced statistically significantly more frequent technical failures compared with the other two groups of suprastructures ( P=0.003 , 0.031 ) . Consequences of complications : The occurrence of loss of retention as a complication increased the odds ratio ( OR ) to 17.6 ( P<0.001 ) to end up in a technical failure . Similarly , the event of a porcelain fracture increased the OR for the suprastructure to be a failure at 10 years to 11.0 ( P < or = 0.004 ) . Treatment of periimplantitis increased the OR to 5.44 ( P < or = 0.011 ) to result in a biological failure compared with implants in which this type of treatment was not applied . CONCLUSION The three groups of suprastructures demonstrated marked differences in their patterns of failures and complications . Complications increased the risk for failure . Support by CRF , University of Berne , Switzerl and 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
An association between the kind of complications and different types of restorations could not be established .
Nevertheless , a relatively high failure rate due to caries and ceramic fractures was noted
OBJECTIVE The aim of this study was to identify if different types of indirect restorations used for single teeth had different biological and technical complications , as well as survival rates .