Ioannis K Konstantinidis1, Stephan Jacoby2, Michael Rädel3, Klaus Böning4. 1. Department of Prosthodontics, Dental School of Dresden, Fetscherstr. 74, 01307, Germany. Electronic address: Ioannis.Konstantinidis@uniklinikum-dresden.de. 2. Department of Prosthodontics, Dental School of Dresden, Fetscherstr. 74, 01307, Germany. 3. Department of Prosthodontics, Dental School of Dresden, Fetscherstr. 74, 01307, Germany. Electronic address: Michael.Raedel@uniklinikum-dresden.de. 4. Department of Prosthodontics, Dental School of Dresden, Fetscherstr. 74, 01307, Germany. Electronic address: Klaus.Boening@uniklinikum-dresden.de.
Abstract
OBJECTIVES: This prospective clinical study compared the performance of implant-retained (study group) and tooth-retained (control) zirconia based fixed dental prostheses (FDPs) with at least 4 units. The null-hypothesis stated that complication rates in both groups are equally distributed. METHODS: The study included patients in need of one 4- to 6-unit implant- or tooth-retained FDP each. All patients were examined 2 weeks after insertion (baseline) and then at 6 month intervals up to 3 years. At follow-up all restorations were examined for framework fracture, chipping, marginal integrity, surface roughness and biological complications. Kaplan-Meier estimation was used for data analysis. RESULTS: 20 patients received tooth-retained and 7 patients implant-retained FDPs. The study was halted early when differences in chipping rates reached a statistically significant level. One FDP in the study group was lost due to implant abutment failure. FDP related chipping rates were 71% in the study group (mean observation time 32 months) and 15% in the control (mean observation time 34 months). Unit (abutment crown/pontic) related chipping rates were 32% in the study group and 6% in the control. Chipping rates differed statistically significant (log-rank test, p<.05). However, all ceramic defects could be corrected by grinding and polishing. No framework fracture was detected. CONCLUSIONS: Within the study limitations, survival rates seem satisfactorily in both implant- and tooth retained long-span zirconia based FDPs. However, implant-supported FDPs seem more susceptible to veneering ceramic chippings. CLINICAL SIGNIFICANCE: The high chipping rates found in this study discourage the use of long-span implant-retained FDPs with zirconia frameworks. The study was registered in ClinicalTrials.gov with the ID Number NCT02220764.
OBJECTIVES: This prospective clinical study compared the performance of implant-retained (study group) and tooth-retained (control) zirconia based fixed dental prostheses (FDPs) with at least 4 units. The null-hypothesis stated that complication rates in both groups are equally distributed. METHODS: The study included patients in need of one 4- to 6-unit implant- or tooth-retained FDP each. All patients were examined 2 weeks after insertion (baseline) and then at 6 month intervals up to 3 years. At follow-up all restorations were examined for framework fracture, chipping, marginal integrity, surface roughness and biological complications. Kaplan-Meier estimation was used for data analysis. RESULTS: 20 patients received tooth-retained and 7 patients implant-retained FDPs. The study was halted early when differences in chipping rates reached a statistically significant level. One FDP in the study group was lost due to implant abutment failure. FDP related chipping rates were 71% in the study group (mean observation time 32 months) and 15% in the control (mean observation time 34 months). Unit (abutment crown/pontic) related chipping rates were 32% in the study group and 6% in the control. Chipping rates differed statistically significant (log-rank test, p<.05). However, all ceramic defects could be corrected by grinding and polishing. No framework fracture was detected. CONCLUSIONS: Within the study limitations, survival rates seem satisfactorily in both implant- and tooth retained long-span zirconia based FDPs. However, implant-supported FDPs seem more susceptible to veneering ceramic chippings. CLINICAL SIGNIFICANCE: The high chipping rates found in this study discourage the use of long-span implant-retained FDPs with zirconia frameworks. The study was registered in ClinicalTrials.gov with the ID Number NCT02220764.
Authors: Vinicius Pavesi Fardin; Gerson Bonfante; Paulo G Coelho; Edmara T P Bergamo; Dimorvan Bordin; Malvin N Janal; Nick Tovar; Lukasz Witek; Estevam A Bonfante Journal: J Appl Oral Sci Date: 2022-04-22 Impact factor: 3.144
Authors: Ioannis Konstantinidis; Dimitra Trikka; Spyridon Gasparatos; Miltiadis E Mitsias Journal: Int J Environ Res Public Health Date: 2018-11-12 Impact factor: 3.390