Department of Fixed Prosthodontics, Faculty of Dentistry, Mansoura University, El Gomhouria St, P.O. Box 35516, Mansoura, Dakahlia Governorate, Egypt.
BMC Oral Health. 2023 Oct 24;23(1):784. doi: 10.1186/s12903-023-03490-1.
The purpose of the current study was to assess the impact of three esthetic CAD/CAM material, titanium base height and their interaction on the retention strength of a hybrid-abutment-crown.
A total of 42 hybrid-abutment crowns with identical external geometries were designed in CAD software to fit two different Ti-Base abutment heights (n = 42/abutment height): either short (S) with 4 mm (n = 21) or long (L) 7 mm (n = 21) height. Each main group was divided into 3 subgroups (n = 7), according to esthetic crown material, Zirconia (Z), Lithium disilicate (L) and Hybrid ceramic (V). A universal primer and an adhesive resin cement were used for bonding according to the manufacturer instructions. Artificial aging in form of water storage (30 days), chewing simulation (50,000-cycles, 49 N, 1.67 Hz) and thermal cyclic (5000 cycles at 5-55 °C) were applied, specimens were pulled-out under tension load in (N) using a universal testing machine. Two and one-way ANOVA and Post Hoc Tukey test were used for statistical analysis.
Long lithium disilicate (LL) group showed the highest retention (738.7 ± 178.5) followed by short lithium disilicate (LS) group (688.6 ± 169.9). Meanwhile, short zirconia (ZS) showed the lowest retention strength (231.1 ± 86.9).
CAD/CAM fabricated lithium disilicate hybrid-abutment-crown can be used instead of conventional crowns over implant abutment. Etchable ceramics are recommended as a material of choice for CAD/CAM fabricated hybrid-abutment-crowns instead of zirconia in terms of retention durability.
本研究旨在评估三种美学 CAD/CAM 材料、钛基底高度及其相互作用对混合基台-冠固位力的影响。
共设计了 42 个具有相同外部几何形状的混合基台冠，以适合两种不同的 Ti-Base 基台高度（n=42/基台高度）：高度为 4mm 的短（S）基台（n=21）或高度为 7mm 的长（L）基台（n=21）。每个主要组根据美学冠材料分为 3 个亚组（n=7），分别为氧化锆（Z）、锂硅玻璃陶瓷（L）和混合陶瓷（V）。根据制造商的说明，使用通用底涂剂和黏结树脂水门汀进行黏结。采用水储存（30 天）、咀嚼模拟（50000 次循环，49N，1.67Hz）和热循环（5-55°C 下 5000 次循环）进行人工老化，使用万能试验机在张力（N）下进行试件拔出试验。采用双因素和单因素方差分析以及事后 Tukey 检验进行统计学分析。
长锂硅玻璃陶瓷（LL）组的固位力最高（738.7±178.5），其次是短锂硅玻璃陶瓷（LS）组（688.6±169.9）。同时，短氧化锆（ZS）组的固位力最低（231.1±86.9）。
CAD/CAM 制作的锂硅玻璃陶瓷混合基台-冠可替代常规冠覆盖种植体基台。从固位耐久性的角度来看，建议在 CAD/CAM 制作的混合基台-冠中，陶瓷材料首选可酸蚀陶瓷，而不是氧化锆。
