Impact of Gluma Desensitizer on the tensile strength of zirconia crowns bonded to dentin: an in vitro study
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Bogna Stawarczyk & Leonie Hartmann & Rahel Hartmann & Malgorzata Roos & Andreas Ender & Mutlu ضzcan & Irena Sailer & Christoph H. F. Hنmmerle
- چاپ و سال / کشور: 2010
Description
This study tested the impact of Gluma Desensitizer on the tensile strength of zirconia crowns bonded to dentin. Human teeth were prepared and randomly divided into six groups (N=144, n=24 per group). For each tooth, a zirconia crown was manufactured. The zirconia crowns were cemented with: (1) Panavia21 (PAN), (2) Panavia21 combined with Gluma Desensitizer (PAN-G), (3) RelyX Unicem (RXU), (4) RelyX Unicem combined with Gluma Desensitizer (RXU-G), (5) G-Cem (GCM) and (6) G-Cem combined with Gluma Desensitizer (GCM-G). The initial tensile strength was measured in half (n=12) of each group and the other half (n=12) subjected to a chewing machine (1.2 Mio, 49 N, 5پ‹C/50پ‹C). The cemented crowns were pulled in a Universal Testing Machine (1 mm/min, Zwick Z010) until failure occurred and tensile strength was calculated. Data were analyzed with one-way and twoway ANOVA followed by a post hoc Scheffe test, t test and Kaplan.Meier analysis with a Breslow.Gehan analysis test (ƒ؟=0.05). After the chewing simulation, the self-adhesive resin cements combined with Gluma Desensitizer showed significantly higher tensile strength (RXU-G, 12.8پ} 4.3 MPa; GCM-G, 13.4پ}6.2 MPa) than PAN (7.3پ} 1.7 MPa) and PAN-G (0.9پ}0.6). Within the groups, PAN, PAN-G and RXU resulted in significantly lower values when compared to the initial tensile strength; the values of all other test groups were stable. In this study, self-adhesive resin cements combined with Gluma Desensitizer reached better long-term stability compared to PAN and PAN-G after chewing simulation.
Clin Oral Invest DOI 10.1007/s00784-010-0502-y Received: 7 September 2010 / Accepted: 6 December 2010
