Objective: The aim of this in vitro study was to compare the shear bond strengths of various cements for zirconia crowns and assess the influence of different luting agents on the bond strength.

Materials and methods: Thirty extracted maxillary premolars were mounted in acrylic molds, with the occlusal enamel removed to expose the dentin. Thirty zirconia blocks (2 mm × 3 mm × 5 mm) were milled from Sagemax zirconia, sintered at 1500°C, and sandblasted. The specimens were divided into three groups (n = 10): Group I (RelyX Universal Cement), Group II (G-Cem LinkForce), and Group III (Panavia SA Cement Plus). After cementation, specimens underwent 2000 thermal cycles (5°C to 55°C) and were tested for shear bond strength using a universal testing machine. The maximum load was recorded, and failure modes were examined under a stereomicroscope. Statistical analysis was performed using Kruskal-Wallis ANOVA and the Mann-Whitney U-test (P < 0.05).

Results: No significant difference (P = 0.630) in bond strength was found between the groups. The mean bond strengths were group I (11.8 MPa), group II (11.5 MPa), and group III (12.4 MPa).

Conclusion: All three cement types provided reliable bond strength for zirconia crowns, with Panavia SA Cement Plus slightly outperforming the others. However, the differences in bond strength were not clinically significant. This study suggests that all three luting agents are viable options for cementing zirconia crowns.

Keywords: G-Cem linkforce; RelyX universal cement; luting agents; panavia SA cement plus; shear bond strength; zirconia crowns.

Copyright: © 2025 Journal of Pharmacy and Bioallied Sciences.

目标： 本体外研究的目的是比较不同粘结剂用于锆瓷冠时的剪切粘结强度，并评估不同的粘结剂对粘结强度的影响。

材料与方法： 从30颗拔除的大牙前磨牙中制备出暴露牙本质的模型，通过去除咬合面的釉质来露出牙本质。用Sagemax锆制作了30个尺寸为2 mm × 3 mm × 5 mm的锆块，并在1500°C下烧结后进行喷砂处理。将样本分为三组（每组n=10）：I组（RelyX通用粘固剂）、II组（G-Cem LinkForce）和III组（Panavia SA粘固剂Plus）。粘结完成后，试样经过2000个热循环（5°C至55°C），使用万能试验机测试剪切粘结强度。记录最大负载，并在立体显微镜下检查失效模式。统计分析采用Kruskal-Wallis ANOVA和Mann-Whitney U检验（P

结果： 三组间粘结强度没有显著差异（P = 0.630）。各组的平均粘结强度分别为I组11.8 MPa、II组11.5 MPa和III组12.4 MPa。

结论： 三种类型的粘固剂均能为锆瓷冠提供可靠的粘结强度，其中Panavia SA粘固剂Plus略胜一筹。然而，这种差异在临床上并不显著。本研究建议这三种粘合剂均为用于固定锆瓷冠的可行选项。

关键词： G-Cem linkforce；RelyX通用粘结剂；粘结剂；Panavia SA粘固剂Plus；剪切粘结强度；锆瓷冠。