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Effect of drill radius setting on prosthesis machining
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±èÃѸí ( Kim Chong-Myeong ) - ½º¸¶À϶óÀÎ Ä¡°ú±â°ø¼Ò Ä¡°úº¸Ã¶ ¿¬±¸ÆÀ
±è¼Ò¸® ( Kim So-Ri ) - ½º¸¶À϶óÀÎ Ä¡°ú±â°ø¼Ò
Á¶¹ÌÇâ ( Cho Mi-Hyang ) - ¿ø±¤º¸°Ç´ëÇб³ Ä¡±â°ø°ú
Abstract
Purpose: The purpose of this study is to evaluate the trueness and fitness of machined prostheses according to drill radius setting in CAD software.
Methods: For this study, standard abutment were replicated in Type ¥³ stone. The stone abutment were scanned using a dental scanner. The CAD design software was designed using scanned abutment data. When designing, the drill radius was set to 0.3 mm and 0 mm, respectively, and saved. The saved design data was milled using a milling machine (n=13). The inner surface of the milled crown was scanned. The trueness and fitness were measured using the inner scan data of prostheses. Independent t-tests were performed to identify significant differences in each data.
Results: Trueness values of the data saved with 0.3 mm and 0 mm drill radius were 18.9 ¡¾2.3 § and 19.1 ¡¾0.9 §, respectively. There was no statistically significant difference between the groups. Fitness values of the data saved with 0.3 mm and 0 mm drill radius were 65.5 ¡¾0.8 § and 33.8 ¡¾1.0 §, respectively. There was a statistically significant difference between the groups (p<.05).
Conclusion : Setting the drill radius is important to produce clinically good fit prostheses.
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Dental CAD/CAM systems; Milling machine; Fitness; Three-dimensional evaluation; Trueness
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