Tunjan, Rene and Rosentritt, Martin and Sterzenbach, Guido and Happe, Arndt and Frankenberger, Roland and Seemann, Rainer and Naumann, Michael (2012) Are Endodontically Treated Incisors Reliable Abutments for Zirconia-based Fixed Partial Dentures in the Esthetic Zone? JOURNAL OF ENDODONTICS, 38 (4). pp. 519-522. ISSN 0099-2399,
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Introduction: This ex vivo pilot study tested the influence of defect extension and quartz-fiber post placement (QFP) on the ex vivo survival rate and fracture resistance of root-treated upper central incisors served as abutments for zirconia 2-unit cantilever fixed partial dentures (2U-FPDs) exposed to 10 years of simulated clinical function. Methods: Human maxillary central incisors were endodontically treated and divided into the following 5 groups (n = 8): (1) access cavity filled with core buildup composite, (2) biproximal class III cavities filled as in group 1, (3) specimens restored as in group 2 with QFP placed, (4) specimens decoronated and core buildup as in group 1, and (5) specimens restored as in group 4 but with QFP as in group 3. On all specimens, 2U-FPDs were placed with dual-curing resin cement. In order to simulate 10 years of clinical function, specimens were exposed to thermal cycling and mechanical loading with subsequent loading to failure. Kaplan-Meier curves were constructed, and log-rank tests were performed. Fracture force and patterns were compared by means of Kruskal-Wallis, Mann-Whitney U (post hoc), and Fisher exact tests, respectively (P = .05). Results: For specimens only with an access cavity, it was observed that 25% had catastrophic tooth fractures and the lowest load-to-fracture values. In all other groups, chipping combined with or without debonding occurred. Groups did not differ significantly regarding the survival rate (P = .603) and fracture patterns (P = .633), but they did for fracture load including technical failures (P = .017). Conclusions: After 10 years of simulated clinical function, both defect extension and placement of QFP had no significant influence on survival of root-treated upper central incisors as abutments restored with zirconia-based 2U-FPDs. (J Endod 2012;38:519-522)
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ALL-CERAMIC CROWNS; OF-THE-LITERATURE; FIBER-REINFORCED COMPOSITE; ROOT-CANAL TREATMENT; CORE BUILD-UPS; IN-VITRO; DENTAL PROSTHESES; LOAD CAPABILITY; COMPLICATION RATES; CHEWING SIMULATION; All ceramic; chewing simulation; dowel; post and core technique |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Zahnärztliche Prothetik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 18 May 2020 06:53 |
| Last Modified: | 18 May 2020 06:53 |
| URI: | https://pred.uni-regensburg.de/id/eprint/18962 |
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