Elbasty Reham Said, Nabil Omnia, Elgohary Mai Salah, Taymour Maha
Professor, Department of Fixed Prosthodontics, Faculty of Dentistry, Cairo University, Cairo, Egypt; and Professor, Division of Fixed Prosthodontics, School of Dentistry, Newgiza University, Giza, Egypt.
Associate Professor, Department of Fixed Prosthodontics, Faculty of Dentistry, Cairo University, Cairo, Egypt; and Associate Professor, Division of Fixed Prosthodontics, School of Dentistry, Newgiza University, Giza, Egypt.
J Prosthet Dent. 2025 Mar 18. doi: 10.1016/j.prosdent.2025.02.044.
Conventional lithium disilicate material is frequently the material of choice whenever laminate veneers are advocated. Advanced lithium disilicate (CEREC Tessera) has been introduced and is thought to be a favorable alternative to conventional lithium disilicates in terms of reduced chairside time. However, its reliability as a material for laminate veneer fabrication has not been adequately assessed.
The purpose of this in vitro study was to assess the vertical marginal gap and internal fit of laminate veneers fabricated from the advanced lithium disilicate ceramic versus the conventional lithium disilicate ceramic.
A total of 22 laminate veneers were fabricated for a maxillary central incisor and divided into 2 groups; Group E (e.max CAD): fabricated from conventional lithium disilicate and Group T (Tessera):fabricated from advanced lithium disilicate. A typodont maxillary right central incisor was prepared by following the recommended parameters, and the laminate veneers were then scanned, designed, and milled. Quantitative measurements of the vertical marginal gap and internal fit of the laminate veneers on the typodont tooth were made by direct viewing and the silicone replica approach, respectively, using a digital microscope. The Student t test was performed for statistical analysis of the results (α=.05).
The mean values of both groups varied significantly. Group T had a lower mean vertical marginal gap (40.5 µm) than group E (52.6 µm) (P<.05). In terms of internal fit, group T had a higher value (191.5 µm) than group E (142.4 µm) (P<.05).
Advanced lithium disilicate laminate veneers revealed better vertical marginal gap and lower internal fit than conventional lithium disilicate laminate veneers.
每当提倡使用层压贴面时，传统的二硅酸锂材料通常是首选材料。先进的二硅酸锂（CEREC Tessera）已被引入，并且在减少椅旁时间方面被认为是传统二硅酸锂的有利替代品。然而，其作为层压贴面制作材料的可靠性尚未得到充分评估。
本体外研究的目的是评估由先进二硅酸锂陶瓷与传统二硅酸锂陶瓷制作的层压贴面的垂直边缘间隙和内部适合性。
总共为一颗上颌中切牙制作了22个层压贴面，并分为2组；E组（e.max CAD）：由传统二硅酸锂制作；T组（Tessera）：由先进二硅酸锂制作。按照推荐参数对一具牙模型的右上颌中切牙进行预备，然后对层压贴面进行扫描、设计和研磨。分别使用数字显微镜通过直接观察和硅橡胶复制法对牙模型上的层压贴面的垂直边缘间隙和内部适合性进行定量测量。对结果进行统计学分析采用Student t检验（α = 0.05）。
两组的平均值差异显著。T组的平均垂直边缘间隙（40.5 µm）低于E组（52.6 µm）（P < 0.05）。在内部适合性方面，T组的值（191.5 µm）高于E组（142.4 µm）（P < 0.05）。
与传统二硅酸锂层压贴面相比，先进二硅酸锂层压贴面显示出更好的垂直边缘间隙和更低的内部适合性。
