Yunnan Key Laboratory of Stomatology, 920th Hospital of Joint Logistics Support Force of Chinese People's Liberation Army, Kunming, China.
Yunnan Key Laboratory of Stomatology, Department of Prosthodontics, Kunming Medical University School and Hospital of Stomatology, Kunming, China.
BMC Oral Health. 2024 Oct 18;24(1):1243. doi: 10.1186/s12903-024-04957-5.
When discolored teeth are repaired with porcelain veneers, the thickness of the restorations should be increased appropriately using opaque porcelain and bonded by applying opaque luting resin cement to cover discolored substrates. However, its impact on the opalescent performance has not been reported yet.
To analyze the effects of opacity, body porcelain layer thickness, and luting resin cement on the opalescence properties of porcelain veneer restorations for discolored teeth.
Ninety IPS d. SIGN A3 porcelain veneer specimens were prepared via powder-paste coating and sintering. Specimens were divided into three groups according to ceramic type and cement used or not: body porcelain group as control, body/opaque porcelain group and body/opaque porcelain-resin cement composite group. Each group was subdivided into three subgroups based on the thickness, 0.50, 0.75, and 1.00 mm (n = 10). Variolink N Bleach XL luting resin cement with thickness of 0.1 mm was applied to the bottoms of body/opaque porcelain specimens to produce body/opaque porcelain-resin cement composites. The opalescence (OP) values were calculated and the micromorphological characteristics were analyzed by scanning electron microscope (SEM). Statistical analysis was performed by using ANOVA test (P < 0.05).
The opalescence values determined for the body porcelain groups with thicknesses of 0.50, 0.75, and 1.00 mm and body/opaque porcelain specimens with thicknesses of 0.45/0.05, 0.70/0.05, and 0.95/0.05 mm were 3.35 ± 0.15, 3.83 ± 0.10, 6.73 ± 0.25, 7.95 ± 0.34, 15.16 ± 0.60, and 16.49 ± 0.89, respectively. The specimens in the body and body/opaque porcelain groups exhibited significant increases in their opalescence values with increasing thickness (P = 0.00). The opalescence values of the specimens increased significantly with the addition of a 0.05 mm opaque porcelain layer (P = 0.00). The opalescence values of the composites containing body/opaque porcelain layers with thicknesses of 0.45/0.05, 0.70/0.05, and 0.95/0.05 mm and luting resin cement were 9.46 ± 0.17, 16.47 ± 0.15, and 18.38 ± 0.47, respectively. The opalescence values of the composite specimens increased significantly with an increase in the thickness of the porcelain layer(P = 0.00).
The opaque porcelain layer and opaque resin cement can significantly improve the opalescence properties of porcelain laminate veneers for discolored teeth, but the opalescence performance is still poor than natural teeth. The body porcelain only contributes to opalescence within a certain thickness range.
当变色的牙齿用瓷贴面修复时，应通过使用不透明瓷增加修复体的厚度，并通过施加不透明粘固树脂水泥来覆盖变色的基底进行粘合。然而，其对乳光性能的影响尚未有报道。
分析不透明度、体瓷层厚度和粘固树脂水泥对变色牙齿瓷贴面修复体乳光性能的影响。
通过粉末-糊剂涂覆和烧结制备 90 个 IPS d. SIGN A3 瓷贴面标本。根据陶瓷类型和是否使用水泥将标本分为三组：体瓷组为对照组、体/不透明瓷组和体/不透明瓷-树脂水泥复合材料组。每组根据厚度进一步分为三组，0.50、0.75 和 1.00 mm（n=10）。在体/不透明瓷标本的底部施加厚度为 0.1 mm 的 Variolink N Bleach XL 粘固树脂水泥，以产生体/不透明瓷-树脂水泥复合材料。计算乳光（OP）值，并通过扫描电子显微镜（SEM）分析微观形貌特征。采用方差分析（P<0.05）进行统计分析。
厚度为 0.50、0.75 和 1.00 mm 的体瓷组和厚度为 0.45/0.05、0.70/0.05 和 0.95/0.05 mm 的体/不透明瓷标本的乳光值分别为 3.35±0.15、3.83±0.10、6.73±0.25、7.95±0.34、15.16±0.60 和 16.49±0.89。体瓷组和体/不透明瓷组标本的乳光值随厚度的增加而显著增加（P=0.00）。随着 0.05 mm 不透明瓷层的添加，乳光值显著增加（P=0.00）。厚度分别为 0.45/0.05、0.70/0.05 和 0.95/0.05 mm 的体/不透明瓷层和粘固树脂水泥复合材料的乳光值分别为 9.46±0.17、16.47±0.15 和 18.38±0.47。随着瓷层厚度的增加，复合材料标本的乳光值显著增加（P=0.00）。
不透明瓷层和不透明树脂水泥可以显著提高变色牙瓷贴面的乳光性能，但乳光性能仍不如天然牙。体瓷仅在一定厚度范围内有助于乳光。
