Clinic of Fixed and Removable Prosthodontics and Dental Material Science, Center of Dental Medicine, University of Zurich, Plattenstrasse 11, 8032, Zurich, Switzerland.
Clin Oral Investig. 2012 Feb;16(1):201-13. doi: 10.1007/s00784-010-0502-y. Epub 2011 Feb 19.
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, 5°C/50°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 two-way ANOVA followed by a post hoc Scheffé test, t test and Kaplan-Meier analysis with a Breslow-Gehan analysis test (α = 0.05). After the chewing simulation, the self-adhesive resin cements combined with Gluma Desensitizer showed significantly higher tensile strength (RXU-G, 12.8 ± 4.3 MPa; GCM-G, 13.4 ± 6.2 MPa) than PAN (7.3 ± 1.7 MPa) and PAN-G (0.9 ± 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.
本研究旨在测试 Gluma Desensitizer 对黏接于牙本质的氧化锆全瓷冠拉伸强度的影响。实验选用人类牙齿，随机分为六组（每组 144 颗牙，每组 24 颗牙）。对每颗牙齿制备氧化锆全瓷冠，用以下材料黏接：（1）Panavia21（PAN）；（2）Panavia21 结合 Gluma Desensitizer（PAN-G）；（3）RelyX Unicem（RXU）；（4）RelyX Unicem 结合 Gluma Desensitizer（RXU-G）；（5）G-Cem（GCM）；（6）G-Cem 结合 Gluma Desensitizer（GCM-G）。每组的一半样本（n = 12）用于初始拉伸强度测量，另一半样本（n = 12）进行咀嚼机模拟实验（120 万次，49 N，5°C/50°C）。将黏接后的全瓷冠用万能试验机（Zwick Z010，1 mm/min）以直至断裂的方式进行拉伸，计算拉伸强度。采用单因素和双因素方差分析，随后进行事后Scheffé 检验、t 检验和 Kaplan-Meier 分析，以及 Breslow-Gehan 分析检验（α = 0.05）。咀嚼模拟后，自黏结树脂黏固剂结合 Gluma Desensitizer 的拉伸强度显著高于 PAN（7.3 ± 1.7 MPa）和 PAN-G（0.9 ± 0.6 MPa），其中 RXU-G 组（12.8 ± 4.3 MPa）和 GCM-G 组（13.4 ± 6.2 MPa）。组内比较，PAN、PAN-G 和 RXU 组与初始拉伸强度相比，其值显著降低；其余测试组的数值均保持稳定。在本研究中，咀嚼模拟后，自黏结树脂黏固剂结合 Gluma Desensitizer 与 PAN 和 PAN-G 相比，具有更好的长期稳定性。
