Choi Jung-Hoon, Heo Seong-Joo, Koak Jai-Young, Kim Seong-Kyun, Park Ji-Man, Ahn Jin-Soo
Department of Prosthodontics, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
Department of Dental Biomaterials Science and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
J Adv Prosthodont. 2023 Apr;15(2):63-71. doi: 10.4047/jap.2023.15.2.63. Epub 2023 Apr 25.
The aim of this study was to assess the effect of hemispherical dimple structures on the retention of cobalt-chromium (Co-Cr) crowns cemented to titanium abutments, with different heights and numbers of dimples on the axial walls.
3.0-mm and 6.0-mm abutments (N = 180) and Co-Cr crowns were prepared. The experimental groups were divided into two and four dimple groups. The crowns were cemented by TempBond and PANAVIA F 2.0 cements. The retention forces were measured after thermal treatments. A two-way Analysis of Variance (ANOVA) and post-hoc Tukey HSD test were conducted to analyze change in retention forces by use of dimples between groups, as well as test for the effect of abutment height change (α = .05).
Results of the two-way ANOVA showed a statistically significant difference in retention force due to the use of dimples, regardless of the types of cements used ( < .001). A significantly higher mean retention forces were observed in the groups with dimples than in the control group, using the post hoc Tukey HSD test ( < .001). Results of test displayed a statistically significant increase in the retention force with 6.0-mm abutments compared with 3.0-mm abutments ( < .001). The groups without dimples revealed adhesive failure of cements, while the groups with dimples showed mixed failure of cements.
Use of hemispherical dimples was effective for increasing retention forces of cemented crowns.
本研究旨在评估半球形凹坑结构对粘结在钛基台上的钴铬（Co-Cr）冠的固位力的影响，轴向壁上凹坑的高度和数量不同。
制备3.0毫米和6.0毫米的基台（N = 180）以及Co-Cr冠。实验组分为两个凹坑组和四个凹坑组。冠用TempBond和PANAVIA F 2.0粘结剂粘结。热处理后测量固位力。进行双向方差分析（ANOVA）和事后Tukey HSD检验，以分析各组之间使用凹坑导致的固位力变化，以及检验基台高度变化的影响（α = 0.05）。
双向方差分析结果显示，无论使用何种粘结剂类型，由于使用凹坑，固位力存在统计学上的显著差异（P < 0.001）。使用事后Tukey HSD检验观察到，有凹坑的组的平均固位力明显高于对照组（P < 0.001）。检验结果显示，与3.0毫米基台相比，6.0毫米基台的固位力有统计学上的显著增加（P < 0.001）。没有凹坑的组显示粘结剂粘结失败，而有凹坑的组显示粘结剂混合失败。
使用半球形凹坑可有效提高粘结冠的固位力。
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