Department of Prosthodontics and Materials Science, Leipzig University, Liebigstraße 12, 04103, Leipzig, Germany.
Department of Cariology, Endodontology and Periodontology, Leipzig University, Liebigstraße 12, 04103, Leipzig, Germany.
Clin Oral Investig. 2024 Nov 26;28(12):655. doi: 10.1007/s00784-024-06046-x.
This study investigated the influence of prophylactic treatments and thermocycling on the marginal and internal veneering interface (tooth-veneer) as well as on the surface texture of ceramic veneers.
A total of 32 extracted human premolars were restored with veneers made of lithium disilicate (LDS) or zirconia-reinforced lithium silicate (ZLS). An artificial aging of the specimens was conducted via five cycles of both thermocycling (5/55°C) and prophylactic treatment (powder air polishing or ultrasonic scaling). Changes in the marginal interface and in the surface texture were examined using confocal laser scanning microscopy. The internal interface and the microstructure were investigated using micro X-ray computed tomography.
Artificial aging resulted in a deepening of the marginal interface across all groups (mean height: 4.51-15.74 μm, maximum height: 10.42-22.71 μm, cross-section: 256.68-1525.84 μm², regardless of the veneer material or prophylaxis method. No change in surface texture was observed. The internal interface exhibited defects for all groups after artificial aging. ZLS showed cracks in five out of eight veneers after exposure to ultrasonic scaling and thermocycling.
Ceramic veneers exhibited a high resistance to prophylactic measures in terms of surface durability, but a deepening of the marginal interface should be taken into account. With regard to the formation of cracks within the material, the use of ultrasonic scaling is not recommended for ZLS veneers.
The influence of artificial aging, including prophylactic treatments, plays a critical role in assessing longevity for veneers in defect-oriented and esthetic dentistry.
本研究旨在探讨预防性治疗和热循环对边缘和内部贴面界面（牙-贴面）以及陶瓷贴面表面纹理的影响。
共对 32 颗人离体前磨牙进行修复，使用锂硅二酸盐（LDS）或氧化锆增强锂硅玻璃陶瓷制作贴面。通过热循环（5/55°C）和预防性处理（粉末空气抛光或超声洁牙）的五个循环对标本进行人工老化。使用共聚焦激光扫描显微镜检查边缘界面和表面纹理的变化。使用微 X 射线计算机断层扫描研究内部界面和微观结构。
人工老化导致所有组的边缘界面深度增加（平均高度：4.51-15.74μm，最大高度：10.42-22.71μm，横截面：256.68-1525.84μm²，与贴面材料或预防方法无关。未观察到表面纹理的变化。人工老化后，所有组的内部界面均出现缺陷。经超声洁牙和热循环处理后，有 5 个 ZLS 贴面中的 8 个出现裂缝。
陶瓷贴面在表面耐久性方面对预防性措施具有高抵抗力，但应考虑边缘界面的加深。对于材料内裂纹的形成，不建议对 ZLS 贴面使用超声洁牙。
人工老化的影响，包括预防性处理，在评估面向缺陷和美学牙科的贴面的使用寿命方面起着关键作用。
