Saab Rafaella Caramori, da Cunha Leonardo Fernandes, Gonzaga Carla Castiglia, Mushashe Amanda Mahammad, Correr Gisele Maria
DDS, Graduate Student of the School of Health Sciences, Universidade Positivo, Curitiba, PR, Brazil.
DDS, MSc, PhD, Professor of the School of Health Sciences, Universidade Positivo, Curitiba, PR, Brazil.
Int J Dent. 2018 Sep 5;2018:5189767. doi: 10.1155/2018/5189767. eCollection 2018.
The aim of the study was to measure the marginal and internal adaptation (MIA) of zirconia copings, made of 4 ceramic systems for CAD/CAM, using microcomputed tomography (micro-CT) technology.
Two identical stainless steel models were used, representing a preparation for full ceramic crown on a lower molar. The master models were then scanned for the production of copings from specific yttrium oxide partially stabilized tetragonal zirconia polycrystal ceramic blocks of each system (=10): Cerec/inCoris Zi, Sirona; Cercon/Cercon base, Dentsply; Ceramill/Ceramill Zi, Amann Girrbach; and Lava/Lava Frame Zirconia, 3M ESPE. MIA was evaluated measuring 4 points as follows: marginal gap (MG), axial wall gap (AW), axio-occlusal angle gap (AO), and central occlusal area gap (CO). The data were statistically analyzed by ANOVA and Tukey's test ( = 0.05).
The ceramic system Lava showed greater internal desadaptation (80.75 ± 22.69 m) while CEREC presented the lowest values (49.92 ± 11.77 m). There were significant differences between the measurement points evaluated. CO demonstrated the greater values (77.03 ± 22.61 m). All marginal and internal adaptation values were considered clinically acceptable.
It was concluded that there was an influence of the type of ceramic system in marginal and internal adaptation of copings in zirconia.
本研究旨在使用微型计算机断层扫描（micro-CT）技术测量由4种用于计算机辅助设计/计算机辅助制造（CAD/CAM）的陶瓷系统制成的氧化锆全冠边缘和内部适合性（MIA）。
使用两个相同的不锈钢模型，代表下颌磨牙全瓷冠的预备体。然后对主模型进行扫描，以便从每个系统（n = 10）的特定氧化钇部分稳定四方氧化锆多晶陶瓷块制作全冠。通过测量以下4个点评估MIA：边缘间隙（MG）、轴壁间隙（AW）、轴-咬合角间隙（AO）和中央咬合面间隙（CO）。数据采用方差分析和Tukey检验进行统计学分析（α = 0.05）。
Lava陶瓷系统显示出更大的内部不适合性（80.75 ± 22.69μm），而CEREC呈现出最低值（49.92 ± 11.77μm）。在所评估的测量点之间存在显著差异。CO显示出更大的值（77.03 ± 22.61μm）。所有边缘和内部适合性值均被认为在临床上可接受。
得出的结论是，陶瓷系统类型对氧化锆全冠的边缘和内部适合性有影响。
