Effect of laboratory workflow on the internal fit of pressed lithium disilicate restorations
Abstract
Introduction: Computeraided design and machining (CAD/CAM) and 3D printing provide interesting alternatives for fabricating patterns used in the heat-pressing technique of glass ceramics. However, there is limited evidence regarding the accuracy and precision of the resulting restorations. The aim of this study was to compare the internal fit of pressed lithium disilicate restorations produced from patterns created using manual wax-up, 3D printing, and CAD/CAM.
Materials and Methods: Thirty-six mandibular molar models with mesio-occluso-distal cavities were 3D printed. Injection patterns for these cavities were created using manual wax-up (MW), 3D printing (3DP), and CAD/CAM (CC) (n=12). Heat pressing was conducted using lithium disilicate, and the resulting restorations were adhesively cemented onto the models. The obtained samples were sectioned mesiodistally, and the internal fit between the restorations and the models was analyzed using a stereomicroscope. The results were evaluated using ANOVA and Tukey's post-hoc test (0.05).
Results: The highest fit values were observed for the CC group (135 µm), being significantly more accurate than those of the 3DP (203 µm) and MW (224 µm) groups. Additionally, the CC group also achieved the highest degree of precision.
Conclusion: The fabrication technique of injection patterns is a critical factor in determining the internal fit of pressed lithium disilicate restorations. While CAD/CAM remains the most accurate and precise method, 3D printing seems to be an interesting alternative for the future.
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