PMID- 36705318 OWN - Quintessenz Verlags-GmbH CI - Copyright Quintessenz Verlags-GmbH OCI - Copyright Quintessenz Verlags-GmbH TA - Int J Comput Dent JT - International Journal of Computerized Dentistry IS - 2702-9514 (Electronic) IS - 1463-4201 (Print) IP - 0 VI - 0 PST - ppublish DP - 9999 PG - 0-0 LA - en TI - Evaluation of the intaglio surface trueness and fit of zirconia crowns fabricated using different machining strategies with a chairside CAD/CAM system LID - 10.3290/j.ijcd.b3840499 [doi] FAU - Kim, Jae-Hoon AU - Kim J FAU - Lee, Hyeonjong AU - Lee H FAU - Son, Sung-Ae AU - Son S FAU - Hong, Seoung-Jin AU - Hong S FAU - Park, Jeong-Kil AU - Park J CN - OT - 3D printing OT - CEREC OT - comparative 3D analysis OT - dry milling OT - grinding OT - marginal gap AB - Aim: This study aimed to evaluate the intaglio surface trueness and fit of zirconia crowns depending on the different machining strategies used with the CEREC system. Materials and methods: Thirty duplicate tooth models for a single zirconia crown were randomly assigned to the three groups (n = 10) according to the machining mode used for fabrication: grinding, wet milling, and dry milling. The scan data of the final crowns were compared to their design data to evaluate the intaglio surface trueness. The marginal and internal fits were evaluated using the cross-sectional method. The time required for the machining and sintering processes was measured for each group. Result: The wet milling group showed better trueness (RMS, 13.8 ± 1.0 μm) than the grinding and dry milling groups (p < 0.001). The marginal gap was greater in the grinding group (58.6 ± 28.9 μm) than that in the wet milling and dry milling groups (p < 0.001). The dry milling group required the shortest time for the manufacturing process. Conclusion: All machining modes fabricated crowns with a clinically acceptable trueness and fit. However, the dry milling mode was advantageous for the chairside CAD/CAM system with respect to time efficiency. AID - 3840499