Jordáki Dóra, Veress Virág, Kiss Tamás, Szalma József, Fráter Márk, Lempel Edina
Department of Restorative Dentistry and Periodontology, University of Pécs Medical School, Tüzér Street 1, 7623 Pécs, Hungary.
Department of Pharmacology and Pharmacotherapy, University of Pécs Medical School, Szigeti Street 12, 7624 Pécs, Hungary.
Polymers (Basel). 2025 Jul 27;17(15):2049. doi: 10.3390/polym17152049.
Reliable adaptation in Class II resin-based composite (RBC) restorations with margins on cementum remains challenging. This study compared the internal adaptation (IA) and closed porosity (CP) of three restorative strategies for such cavities, using either total-etch or self-etch adhesive approaches. Standardized box-only cavities were prepared on both proximal surfaces of 30 extracted molars, applying self-etch on mesial and total-etch on distal cavities. Group 1 used a layered microhybrid RBC; Group 2 used a flowable RBC base beneath a layered microhybrid RBC; and Group 3 used a thermoviscous RBC in a 4 mm bulk increment. Micro-computed tomography was employed to assess IA and CP. ANOVA, Tukey post hoc, and univariate analyses were used to evaluate group differences and the effects of adhesive/restorative strategies. Group 2 demonstrated the best adaptation (0.10%), whereas Group 3 exhibited the highest internal gap ratio (0.63%) and the lowest CP ( = 0.006). Total-etch adhesive significantly improved IA compared to self-etch ( < 0.001). These findings emphasize the impact of material selection and adhesive technique on the quality of restorations in cementum-located Class II cavities.
边缘位于牙骨质上的II类树脂基复合材料（RBC）修复体的可靠适应性仍然具有挑战性。本研究比较了三种针对此类窝洞修复策略的内部适应性（IA）和封闭孔隙率（CP），分别采用全酸蚀或自酸蚀粘接方法。在30颗拔除磨牙的近中面制备标准化的仅盒状窝洞，近中窝洞采用自酸蚀，远中窝洞采用全酸蚀。第1组使用分层微混合RBC；第2组在分层微混合RBC下方使用流动RBC基底；第3组采用4mm厚增量的热粘性RBC。采用微计算机断层扫描评估IA和CP。使用方差分析、Tukey事后检验和单变量分析来评估组间差异以及粘接/修复策略的效果。第2组显示出最佳适应性（0.10%），而第3组表现出最高的内部间隙率（0.63%）和最低的CP（ = 0.006）。与自酸蚀相比，全酸蚀粘接显著改善了IA（ < 0.001）。这些发现强调了材料选择和粘接技术对牙骨质部位II类窝洞修复体质量的影响。
