Dieter Pils1,2, Ralf J Baeppler2, Rüdiger Junker2, Andrej M Kielbassa3, Frank P Nothdurft4. 1. Pils Zahntechnik GmbH, Bruck an der Glocknerstrasse, Austria. 2. Centre for Prosthodontics and Biomaterials, Danube Private University (DPU), Krems an der Donau, Austria. 3. Centre for Operative Dentistry, Periodontology, and Endodontology, Danube Private University (DPU), Krems an der Donau, Austria. 4. Department of Prosthetic Dentistry and Dental Materials Sciences, Saarland University, Homburg Campus, Bldg. 71.2, 66421, Homburg, Saar, Germany. frank.nothdurft@uks.eu.
Abstract
OBJECTIVE: Aim was to assess the influence of a standard autoclaving protocol on the retention of zirconia abutments glued on titanium bases in two-piece implant abutments. MATERIALS AND METHODS: Twenty-four CAD/CAM-generated zirconia abutments were adhesively cemented on prefabricated titanium bases. Before mechanical and thermal aging, the specimens were divided into two groups. Group 1 was subjected to a standard steam autoclaving protocol and Group 2 remained untreated (control). The tensile strength in all specimens was evaluated by a standardized pull-off test limited to a maximum force of 1000 N. RESULTS: Eleven samples in both groups could be subjected to pull-off testing. Ten samples in Group 1 and three samples in Group 2 failed, while all others reached the maximum pull-off force. This difference was statistically significant. The mean retention values for the failed samples were 694.53 ± 369.10 N in Group 1 and 890.78 ± 25.90 N in Group 2. This difference was not statistically significant. CONCLUSIONS: A standard autoclaving protocol does not reduce detachment force of two-piece zirconia abutments. CLINICAL RELEVANCE: Clinical sterilization processes as recommended by regulatory authorities seem to be harmless to the structural integrity of two-piece zirconia implant abutments, at least with regard to the retention of the components.
OBJECTIVE: Aim was to assess the influence of a standard autoclaving protocol on the retention of zirconia abutments glued on titanium bases in two-piece implant abutments. MATERIALS AND METHODS: Twenty-four CAD/CAM-generated zirconia abutments were adhesively cemented on prefabricated titanium bases. Before mechanical and thermal aging, the specimens were divided into two groups. Group 1 was subjected to a standard steam autoclaving protocol and Group 2 remained untreated (control). The tensile strength in all specimens was evaluated by a standardized pull-off test limited to a maximum force of 1000 N. RESULTS: Eleven samples in both groups could be subjected to pull-off testing. Ten samples in Group 1 and three samples in Group 2 failed, while all others reached the maximum pull-off force. This difference was statistically significant. The mean retention values for the failed samples were 694.53 ± 369.10 N in Group 1 and 890.78 ± 25.90 N in Group 2. This difference was not statistically significant. CONCLUSIONS: A standard autoclaving protocol does not reduce detachment force of two-piece zirconia abutments. CLINICAL RELEVANCE: Clinical sterilization processes as recommended by regulatory authorities seem to be harmless to the structural integrity of two-piece zirconia implant abutments, at least with regard to the retention of the components.
Authors: Luigi Canullo; Marco Tallarico; Stephen Chu; David Peñarrocha; Mutlu Özcan; Paolo Pesce Journal: Int J Oral Maxillofac Implants Date: 2017-05-18 Impact factor: 2.804
Authors: J R Kelly; P F Cesar; S S Scherrer; A Della Bona; R van Noort; M Tholey; A Vichi; U Lohbauer Journal: Dent Mater Date: 2017-10-07 Impact factor: 5.304