University of Sulaimani, College of Dentistry, Kurdistan Region, Iraq.
Biomed Res Int. 2021 Dec 30;2021:1118728. doi: 10.1155/2021/1118728. eCollection 2021.
Marginal discoloration, microleakage, wear, and marginal fractures are all prevalent problems with composite veneers, and this scenario leads the esthetic outcome to deteriorate with time, resulting in patient discontent. . The study's goal was to determine the marginal sealing ability of composite laminate veneers when employing two types of veneer techniques: direct and direct-indirect veneers, as well as two types of composite resin: nanohybrid and microfilled composite resin restorations, using dye penetration method.
In this study, forty extracted human teeth were utilized. Following a standardized veneer preparation on the labial surface of the teeth, they were separated into two groups of 20 teeth each, using the following composite application techniques: group A: direct veneers and group B: direct-indirect veneers. Following that, each major group was separated into two subgroups of ten teeth each, based on the type of composite employed: subgroup 1 used nanohybrid composite resin, while subgroup 2 used microfilled composite resin. All of the samples were kept in distilled water, thermocycled, and soaked in 2% basic fuchsine dye. These specimens were sectioned and examined under a stereomicroscope for dye penetration at the gingival margin. The data was analyzed using independent -tests using SPSS 22.
Using direct-indirect veneer technique with nanohybrid composite resin material resulted in the most negligible dye penetration at the gingival margin, while using direct veneer technique with microfilled composite resin material resulted in the maximum dye penetration. For both composite materials, gingival microleakage was lower when using the direct-indirect veneer technique than when using the direct technique, and the difference was statistically significant ( < 0.05). In both techniques, gingival microleakage was lower with nanohybrid composite than with microfilled composite, and the difference was statistically highly significant ( = 0.001).
The sealing ability of the gingival margin of tooth/composite interface is better when applying direct-indirect veneer technique with nanohybrid composite resin than that of direct veneer technique with microfilled composite resin material.
复合贴面的常见问题包括边缘变色、微渗漏、磨损和边缘裂缝，这些情况会随着时间的推移导致美学效果恶化，从而导致患者不满。本研究的目的是使用两种贴面技术（直接贴面和直接-间接贴面）以及两种类型的复合树脂（纳米复合树脂和微填充复合树脂），通过染料渗透法来确定复合层压贴面的边缘密封能力。
本研究使用了 40 颗人离体牙。在牙齿唇面进行标准化贴面预备后，将其分为两组，每组 20 颗牙，使用以下复合树脂应用技术：A 组：直接贴面；B 组：直接-间接贴面。然后，每个主要组又根据所使用的复合树脂类型分为两个亚组，每组 10 颗牙：第 1 亚组使用纳米复合树脂，第 2 亚组使用微填充复合树脂。所有样本均保存在蒸馏水中，进行热循环，并浸泡在 2%碱性品红染料中。这些样本被切片，并在立体显微镜下检查龈缘的染料渗透情况。使用 SPSS 22 进行独立样本 t 检验分析数据。
使用纳米复合树脂的直接-间接贴面技术导致龈缘染料渗透最小，而使用微填充复合树脂的直接贴面技术导致最大染料渗透。对于两种复合树脂材料，直接-间接贴面技术的龈缘微渗漏低于直接技术，差异具有统计学意义（<0.05）。在两种技术中，纳米复合树脂的龈缘微渗漏低于微填充复合树脂，差异具有统计学高度显著性（=0.001）。
与直接贴面技术用微填充复合树脂材料相比，应用直接-间接贴面技术用纳米复合树脂时，牙/复合界面龈缘的密封能力更好。
