DE Oliveira Limirio João Pedro Justino, Gomes Jéssica Marcela de Luna, Santiago-Junior Joel Ferreira, Lemos Cleidiel Aparecido Araújo, Rezende Maria Cristina Rosifini Alves, Pellizzer Eduardo Piza
Universidade Estadual Paulista "Júlio de Mesquita Filho" (UNESP), Faculdade de Odontologia de Araçatuba, Departamento de Materiais Dentários e Prótese, Araçatuba, SP, Brasil.
Universidade de São Paulo, Faculdade de Odontologia de Ribeirão Preto (FORP-USP), Departamento de Materiais Dentários e Prótese, Ribeirão Preto, SP, Brasil.
J Appl Oral Sci. 2025 May 30;33:e20240589. doi: 10.1590/1678-7757-2024-0589. eCollection 2025.
This in vitro study evaluated implant-supported single crowns with external connections fabricated using different techniques (cast and CAD/CAM) and materials (metal-ceramic and translucent zirconia) regarding vertical and horizontal marginal fit and torque loss before and after mechanical cycling.
A total of 50 specimens prepared using cast (lost wax) and CAD/CAM were divided into five groups-MC (metal-ceramic crowns), ZrB (Co-Cr base, coping milled in zirconia and feldspathic ceramic veneering), Zr (coping milled in zirconia and feldspathic ceramic veneering), MZrB (Co-Cr base and monolithic translucent zirconia crown), and MZr (monolithic translucent zirconia crown)-and subjected to 5×10⁶ mechanical cycles at a 30° angle at 37°C, and an applied load of 150N at 2Hz. All crowns were screwed with a 30Ncm torque. Vertical and horizontal marginal misfit (measured using a 3D optical microscope) and torque loss were assessed before and after mechanical cycling. Statistical analyses used a significance value of 0.05.
Before cycling, MC (93.93±22.84µm) and MZrB (66.12±11.87µm) (p<0.05) crowns showed significantly higher vertical marginal misfit values than Zr (49.92±3µm) and MZr (49.76±3,9µm). ZrB (59.96±4.66µm) crowns exhibited no statistically significant difference when compared with the other groups. MC crowns presented the highest horizontal marginal misfit values before and after cycling in group comparisons (p<0.05). MZrB had the highest torque loss (10N), with a statically significant difference when compared with MZr and Zr (p<0.05). Comparison between all groups showed no significant difference regarding the effect of mechanical cycling (p>0.05).
CAD/CAM manufacturing resulted in lower vertical and horizontal marginal misfit values, especially for monolithic translucent zirconia crowns (MZr) before and after mechanical cycling. All groups presented torque loss before and after mechanical cycling.
本体外研究评估了采用不同技术（铸造和计算机辅助设计/计算机辅助制造，CAD/CAM）和材料（金属陶瓷和半透明氧化锆）制作的带有外部连接的种植体支持单冠在机械循环前后的垂直和水平边缘适合性以及扭矩损失情况。
总共50个采用铸造（失蜡法）和CAD/CAM制备的样本被分为五组——MC组（金属陶瓷冠）、ZrB组（钴铬基底，氧化锆内冠铣削并饰以长石质陶瓷）、Zr组（氧化锆内冠铣削并饰以长石质陶瓷）、MZrB组（钴铬基底和整体式半透明氧化锆冠）以及MZr组（整体式半透明氧化锆冠）——并在37°C下以30°角、2Hz的频率施加150N的载荷进行5×10⁶次机械循环。所有冠均以30Ncm的扭矩旋紧。在机械循环前后评估垂直和水平边缘不适合度（使用三维光学显微镜测量）以及扭矩损失。统计分析采用的显著性值为0.05。
在循环前，MC组（93.93±22.84µm）和MZrB组（66.12±11.87µm）（p<0.05）的冠垂直边缘不适合度值显著高于Zr组（49.92±3µm）和MZr组（49.76±3.9µm）。ZrB组（59.96±4.66µm）的冠与其他组相比无统计学显著差异。在组间比较中，MC组的冠在循环前后水平边缘不适合度值最高（p<0.05）。MZrB组扭矩损失最高（10N），与MZr组和Zr组相比有统计学显著差异（p<0.05）。所有组之间在机械循环影响方面的比较无显著差异（p>0.05）。
CAD/CAM制造导致垂直和水平边缘不适合度值更低，尤其是对于整体式半透明氧化锆冠（MZr）在机械循环前后。所有组在机械循环前后均出现扭矩损失。
