Survival Of Single Crowns Research Articles

Effect of Repairing Endodontic Access Cavities on Survival of Single Crowns and Retainer Restorations

IntroductionThis retrospective study aimed to analyze the effect of repairing endodontic access cavities with composite on the survival of single crowns and retainer restorations of fixed or removable dental prostheses. MethodsDental records of patients attending a university dental clinic were retrospectively screened for single crowns and retainer restorations receiving endodontic treatment after crown placement. Survival (no further intervention) and failure (removal, loss or replacement of crown, replacement of access restoration, or recementation of restoration) of crowns and retainers with repaired endodontic access cavities were recorded. The mean annual failure rates were calculated, and the effect of individual-, tooth-, and restoration-related variables on survival was assessed by univariate log-rank tests and multivariate Cox regression analyses with shared frailty (P < .05). ResultsOne hundred eighty repaired crowns/retainers placed in 151 patients were included (4.5 ± 3.3 years follow-up). Survival after 2, 5, 7, and 10 years amounted to 82.7%, 71.5%, 67.3%, and 48.8% (mean annual failure rate = 9.0%, 6.5%, 5.5%, and 6.9%), respectively. Although tooth type, kind of restoration, endodontic irrigant, repair conditioning methods, and kind of composite affected survival in the univariate regression analyses, only the kind of restoration (single crown vs retainer restoration) remained significant in the multivariate Cox regression model. ConclusionsRepairing endodontic access cavities with composite increases the longevity of single crowns and retainer restorations.

Single crowns on tooth root–resected molars: A retrospective multicentric study

Statement of problemData regarding single restorations on molars treated with root resection and separation are limited. PurposeThe purpose of this retrospective study was to evaluate the clinical success and survival of single crowns on root-resected molars. Material and methodsEighty-six molars were treated with root resection or hemisection, prepared with feather-edge margins and restored with single crowns in 73 patients. The patients were clinically evaluated during regular recall appointments in 2018. Data were analyzed with descriptive statistics. ResultsThe mean follow-up time was 88.7 months (standard deviation, 70.6; range, 6 to 284). Six failures were recorded during the observation period, with a cumulative survival rate of 93%. ConclusionsIn this retrospective evaluation, single crowns on root-resected molars with feather-edge margins had clinical outcomes similar to those reported for single crowns on implants in the molar area. First molars and molars with 2 retained roots showed a better survival rate than second molars.

Dental implants with fixed prosthodontics in oligodontia: A retrospective cohort study with a follow-up of up to 25 years

Statement of problemLong-term assessments of implant survival and treatment outcome in patients with oligodontia are lacking. PurposeThe purpose of this retrospective clinical study was to assess which factors determine a long-term implant survival and treatment outcome of up to 25 years in a cohort of patients with oligodontia. Material and methodsThe medical records of all patients with oligodontia treated with fixed implant prosthodontics between January 1991 and December 2015 in the Department of Oral and Maxillofacial Surgery at the University Medical Center Groningen, the Netherlands, were assessed. Specifically, this involved the retrieval of records on the need for and mode of bone augmentation, implant survival, and survival of and adverse events associated with the prosthodontics. The Kaplan-Meier estimator was used to analyze implant and superstructure survival. Log-rank tests were used to compare the survival of subgroups. ResultsA total of 126 patients with oligodontia were treated with dental implants. Of the 777 implants in total, 56 were lost, resulting in a 5-year cumulative survival of 95.7% (95% confidence interval [CI], 94.2% to 97.2%) and a 10-year cumulative survival of 89.2% (95% CI, 86.2% to 92.2%). The survival of implants placed in regions where bone augmentation surgery had been performed was significantly lower. The 5-year cumulative superstructure survival was 90.5% (95% CI, 87.6% to 93.5%), and the 10-year cumulative superstructure survival was 80.3% (95% CI, 75.3% to 85.3%). The performance of the screw-retained and cemented superstructures was comparable, but the survival of single crowns was significantly higher than the survival of fixed partial dentures (P<.001). ConclusionsImplant treatment is a predictable treatment option for patients with oligodontia with a favorable long-term outcome. Survival of implants in augmented areas is lower.

Five-year retrospective study on success, survival and incidence of complications of single crowns supported by dental implants.

To determine the survival and the incidence of biologic and technical complications of implant-supported single crowns after 5years of function. Patients treated with dental implants at the National Dental Centre, Singapore, from 2006 to 2010 were recruited from the Implant Registry and evaluated by two clinicians. One hundred and ninety-four patients, with 266 implant single crowns (SCs), were examined clinically for biologic and technical parameters. Digital radiographs were also obtained. Failure and complication rates were calculated based on the person-time at risk. The mean biologic time in function was 5.9±1.3years. None of the implants had been lost, resulting in a 5-year survival of 100%. The corresponding success (complication-free) rate was 92.9% (95% CI: 89.2, 95.4). The mean prosthetic time in function was 5.2±1.5years, with a 5-year survival of implant-supported SCs of 98.2% (95% CI: 95.8, 99.3). The corresponding success rate was 88.9% (95% CI: 84.8, 92.0). The 5-year incidence of biologic complications, defined as PPD ≥6mm with bleeding on probing/suppuration, in the presence of ≥2.5mm of radiographic bone loss, was 7.1% (95% CI: 4.6, 10.9). The 5-year incidence of technical complications was 6.5% (95% CI: 3.9, 10.7) for fracture of the veneering material, 4.3% (95% CI: 2.4, 7.7) for loss of retention, 2.1% (95% CI: 1.0, 4.7) for abutment screw loosening and 0.4% (95% CI: 0.1, 2.5) for abutment fracture. High survival rates (98.4%) for both the single tooth implants and the respective single crowns were demonstrated after 5.2±1.5years. However, the success rates were considerably lower (84.9%), indicating that biologic and technical complications were frequent.

Systematic review of the survival rate and the incidence of biological, technical, and aesthetic complications of single crowns on implants reported in longitudinal studies with a mean follow‐up of 5 years

To assess the 5-year survival of implant-supported single crowns (SCs) and to describe the incidence of biological, technical, and aesthetic complications. The focused question was: What is the survival rate of implants supporting single crowns and implant-supported crowns with a mean follow-up of 5 years and to which extent do biological, technical, and aesthetic complications occur? A Medline search (2006-2011) was performed for clinical studies focusing on implant-supported SCs with a mean follow-up of at least 5 years. The search was complemented by an additional hand search and the inclusion of 24 studies from a previous systematic review (Jung et al. 2008a). Survival and complication rates were analyzed using random-effects Poisson's regression models to obtain summary estimates of 5- and 10-year proportions. Forty-six studies derived from an initial search count of 1083 titles and the complementary publications from the previous systematic review (Jung et al. 2008a) were selected and the data were extracted. Based on the meta-analysis, survival of implants supporting SCs at 5 years amounted to 97.2% (95% CI: 96.3-97.9%), and at 10 years amounted to 95.2% (95% CI: 91.8-97.2%). The survival of implant-supported SCs was 96.3% (95% CI: 94.2-97.6%) after 5 years and 89.4% (95% CI: 82.8-93.6%) after 10 years. For biological complications, a 5-year cumulative soft tissue complication rate of 7.1% (95% CI: 4.4-11.3%) and a cumulative complication rate for implants with bone loss >2 mm of 5.2% (95% CI: 3.1-8.6%) were calculated. Technical complications reached a cumulative incidence of 8.8% (95% CI: 5.1-15.0%) for screw-loosening, 4.1% (95% CI: 2.2-7.5%) for loss of retention, and 3.5% (95% CI: 2.4-5.2%) for fracture of the veneering material after 5 years. The cumulative 5-year aesthetic complication rate amounted to 7.1% (95% CI: 3.6-13.6%). The outcomes of the meta-analysis demonstrated high implant survival rates for both the single tooth implants and the respective single crowns after 5 and 10 years. However, technical, biological, and aesthetic complications were frequent.

Factors influencing survival of reconstructions. Consensus report of Working Group 2

In order to evaluate the level of evidence of factors influencing the survival of reconstructions, systematic reviews of the relevant literature were prepared by a group of rapporteurs. The review papers were circulated to the members of the group before the conference and formed the basis for group and panel discussions. Subsequently, modifications were added to the review papers, and suggestions for consensus statements concerning the following topics were prepared and again critically reviewed in the group and in the plenum: Impact of (i) periodontal disease on the survival of tooth-supported reconstructions, (ii) post-surgical factors as supportive therapy on the survival of implant supported reconstructions, (iii) technical and/or biological complications on the survival of different types of reconstructions, (iiii) material choice for reconstructions on the survival of single crowns and fixed dental prostheses.