Bömicke Wolfgang, Haas Julius, Awounvo Sinclair, Rammelsberg Peter, Rues Stefan
Department of Prosthetic Dentistry, Medical Faculty, Heidelberg University, Heidelberg, Germany.
Poliklinik für Zahnärztliche Prothetik, Im Neuenheimer Feld 400, 69120, Heidelberg, Germany.
Clin Oral Investig. 2024 Dec 13;29(1):15. doi: 10.1007/s00784-024-06103-5.
To prospectively evaluate the wear of posterior zirconia resin-bonded fixed partial dentures (RBFPDs) with polished occlusal surfaces and their natural enamel antagonists compared to contralateral controls in an enamel-enamel contact over 5 years.
In six patients with either an inlay- or wing-retained RBFPD made of monolithic 3 mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP), wear was evaluated indirectly using baseline and annual polyvinyl siloxane impressions. Resulting gypsum models were digitized and aligned by unchanged surface areas. Wear was analyzed by depth and area. For each parameter, descriptive statistics were used to express the degree of wear observed at yearly intervals for each group. A linear mixed regression analysis was performed to compare the enamel opposing 3Y-TZP group and the enamel-enamel controls at tooth level. All statistical tests were conducted at the 5% significance level.
After 5 years, the mean enamel wear depth of teeth opposing 3Y-TZP was 77 μm, compared to 54 μm for control teeth. No wear was observed on the 3Y-TZP RBFPDs. Maximum enamel wear depth and wear area were 229 μm and 9 mm², respectively, for teeth opposing 3Y-TZP, and 135 μm and 5 mm² for control teeth. Significant differences in mean enamel wear depth emerged after 2 years of observation.
Polished 3Y-TZP caused more enamel wear than natural antagonists over 5 years, but the wear remained within the range reported for other commonly used indirect restorative materials.
The clinical use of polished 3Y-TZP restorations appears to be justified in terms of natural antagonist wear behavior.
前瞻性评估具有抛光咬合面的后牙氧化锆树脂粘结固定局部义齿（RBFPD）及其天然牙釉质对抗牙在5年的牙釉质-牙釉质接触中与对侧对照相比的磨损情况。
在6例患者中，制作了由整体式3 mol%氧化钇稳定四方氧化锆多晶体（3Y-TZP）制成的嵌体或翼板固位RBFPD，使用基线和每年的聚乙烯基硅氧烷印模间接评估磨损情况。将得到的石膏模型数字化，并通过不变的表面积进行对齐。通过深度和面积分析磨损情况。对于每个参数，使用描述性统计来表达每组每年观察到的磨损程度。进行线性混合回归分析以在牙齿水平上比较与3Y-TZP相对的牙釉质组和牙釉质-牙釉质对照组。所有统计检验均在5%显著性水平下进行。
5年后，与3Y-TZP相对的牙齿的平均牙釉质磨损深度为77μm，而对照牙齿为54μm。在3Y-TZP RBFPD上未观察到磨损。与3Y-TZP相对的牙齿的最大牙釉质磨损深度和磨损面积分别为229μm和9mm²，对照牙齿为135μm和5mm²。观察2年后，平均牙釉质磨损深度出现显著差异。
在5年的时间里，抛光的3Y-TZP比天然对抗牙导致更多的牙釉质磨损，但磨损仍在其他常用间接修复材料报道的范围内。
就天然对抗牙的磨损行为而言，抛光3Y-TZP修复体的临床应用似乎是合理的。
