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Impact of gluma desensitizer on the tensile strength of zirconia crowns bonded to dentin: An in-vitro study


Hartmann, L. Impact of gluma desensitizer on the tensile strength of zirconia crowns bonded to dentin: An in-vitro study. 2010, University of Zurich, Faculty of Medicine.

Abstract

Objectives: This study tested the impact of Gluma Desensitizer on the tensile strength of zirconia crowns bonded to dentin. Methods: Human teeth were prepared and randomly divided into 5 groups (N=120, n=24 per groups). For each tooth a zirconia crown was manufactured. The zirconia crowns were cemented with: i) Panavia21 (control group), ii) RelyX Unicem, iii) RelyX Unicem combined with Gluma Desensitizer, iv) G-Cem, v) G-Cem combined with Gluma Desensitizer. The initial tensile strength was measured in half (n=12) of each group and the other half (n=12) was subjected to a chewing machine (1.2 Mio, 49N, 5°C/50°C). The cemented crowns were pulled in a Universal Testing Machine (1 mm/min, Zwick Z010) until failure occured and the tensile strength was calculated. Data were analyzed with one-way and two-way ANOVA followed by a post-hoc Scheffé test, t-test and Kaplan-Meier analysis with a Breslow-Gehan analysis test (alpha = 0.05). Results: After chewing simulation, the self-adhesive resin cements combined with Gluma Desensitizer showed significantly higher tensile strength (RelyX Unicem: 12.8 ±4.3 MPa, G-Cem: 13.4 ±6.2 MPa) than the control group Panavia21 (7.3 ±1.7 MPa). Within the groups, Panavia21 and RelyX Unicem resulted in significantly lower values when compared to the initial tensile strength; the values of all other test groups were stable. Conclusion: In this study self-adhesive resin cements combined with Gluma Desensitizer reached better long-term stability compared to control group after chewing simulation.

Abstract

Objectives: This study tested the impact of Gluma Desensitizer on the tensile strength of zirconia crowns bonded to dentin. Methods: Human teeth were prepared and randomly divided into 5 groups (N=120, n=24 per groups). For each tooth a zirconia crown was manufactured. The zirconia crowns were cemented with: i) Panavia21 (control group), ii) RelyX Unicem, iii) RelyX Unicem combined with Gluma Desensitizer, iv) G-Cem, v) G-Cem combined with Gluma Desensitizer. The initial tensile strength was measured in half (n=12) of each group and the other half (n=12) was subjected to a chewing machine (1.2 Mio, 49N, 5°C/50°C). The cemented crowns were pulled in a Universal Testing Machine (1 mm/min, Zwick Z010) until failure occured and the tensile strength was calculated. Data were analyzed with one-way and two-way ANOVA followed by a post-hoc Scheffé test, t-test and Kaplan-Meier analysis with a Breslow-Gehan analysis test (alpha = 0.05). Results: After chewing simulation, the self-adhesive resin cements combined with Gluma Desensitizer showed significantly higher tensile strength (RelyX Unicem: 12.8 ±4.3 MPa, G-Cem: 13.4 ±6.2 MPa) than the control group Panavia21 (7.3 ±1.7 MPa). Within the groups, Panavia21 and RelyX Unicem resulted in significantly lower values when compared to the initial tensile strength; the values of all other test groups were stable. Conclusion: In this study self-adhesive resin cements combined with Gluma Desensitizer reached better long-term stability compared to control group after chewing simulation.

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Additional indexing

Item Type:Dissertation
Referees:Hämmerle C H F
Communities & Collections:04 Faculty of Medicine > Center for Dental Medicine > Clinic for Fixed and Removable Prosthodontics
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:2010
Deposited On:22 Jan 2011 18:44
Last Modified:08 Aug 2018 06:13
Number of Pages:36
OA Status:Green

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