Rodrigues Thaís Cristina Mendes, Resende Caio Cesar Dias, Moura Guilherme Faria, Santos Fábio Henrique de Paulo Costa, Mendonça Gustavo, Zancope Karla, Neves Flávio Domingues
Private practice. Uberlândia, MG, Brazil.
Centro Universitário do Triângulo - Unitri, Department of Implantology, Uberlândia, MG, Brazil.
Braz Oral Res. 2024 Jul 12;38:e063. doi: 10.1590/1807-3107bor-2024.vol38.0063. eCollection 2024.
Computer-aided manufacturing (CAM) technology allows the use of different manufacturing techniques. This in vitro study aimed to evaluate the marginal fit of temporary restorations manufactured using conventional chairside methods, milling, and three-dimensional printing. Fifteen 3-element temporary restorations specimens were produced and categorized into three groups: non-digital, obtained using the conventional chairside method (GC); milled (GM); and three-dimensionally printed (GP). Marginal fit was assessed using scanning electron microscopy (SEM) performed under two conditions: one with only the central screw tightened, and the other with all three screws tightened. Horizontal misfit values were categorized as over-, equal-, and under-extended and qualitatively analyzed. Statistical analysis was performed using the Tukey-Kramer test (α=0.05). In the vertical assessment, three-dimensionally printed restorations demonstrated greater misfit than restorations obtained by milling and the conventional chairside method (P<0.05). In the horizontal assessment, the misfit in the GP group was significantly higher than that in the GM and GC groups. Restorations obtained using the conventional chairside method and milled provisional restorations showed more favorable results than three-dimensionally printed restorations.
计算机辅助制造（CAM）技术允许使用不同的制造技术。本体外研究旨在评估采用传统椅旁方法、铣削和三维打印制造的临时修复体的边缘适合性。制作了15个三单元临时修复体标本，并分为三组：非数字化组，采用传统椅旁方法获得（GC）；铣削组（GM）；以及三维打印组（GP）。使用扫描电子显微镜（SEM）在两种条件下评估边缘适合性：一种是仅拧紧中央螺钉，另一种是拧紧所有三个螺钉。将水平不适合值分类为过度延伸、相等延伸和不足延伸，并进行定性分析。使用Tukey-Kramer检验（α=0.05）进行统计分析。在垂直评估中，三维打印的修复体显示出比通过铣削和传统椅旁方法获得的修复体更大的不适合性（P<0.05）。在水平评估中，GP组的不适合性明显高于GM组和GC组。采用传统椅旁方法获得的修复体和铣削的临时修复体比三维打印的修复体显示出更有利的结果。
