Trueness of milled prostheses according to number of ball-end mill burs
- Authors
- Kim, Chong-Myeong; Kim, So-Ri; Kim, Ji-Hwan; Kim, Hae-Young; Kim, Woong-Chul
- Issue Date
- 5월-2016
- Publisher
- MOSBY-ELSEVIER
- Citation
- JOURNAL OF PROSTHETIC DENTISTRY, v.115, no.5, pp.624 - 629
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF PROSTHETIC DENTISTRY
- Volume
- 115
- Number
- 5
- Start Page
- 624
- End Page
- 629
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/88784
- DOI
- 10.1016/j.prosdent.2015.10.014
- ISSN
- 0022-3913
- Abstract
- Statement of problem. Making a computer-aided design/computer-aided manufacturing (CAD/CAM) prosthesis with a milling machine often requires 2 (2- and 1-mm diameter) or 3 (2-, 1-, and 0.6-mm diameter) burs; however, using 3 burs can reduce time effectiveness and increase cost. Studies evaluating the trueness of prostheses made with 2 and 3 burs are lacking. Purpose. The purpose of this in vitro study was to evaluate the 3-dimensional trueness of crown prostheses made using 2 and 3 ball-end mill burs in the milling process. Material and methods. The abutment die of the maxillary right first molar for ceramic crowns was designed with computer-aided design software. After the crown prosthesis design was completed, polyurethane blocks were milled using 2 and 3 burs with a 5-axis milling machine. The outer and inner surfaces of the milled crown prostheses were scanned with a dental scanner. The inner part was separated into a marginal part and an internal part using 3-dimensional evaluation software. The 3-dimensional trueness of the prostheses milled with 2 or 3 burs was compared. Results. No significant differences in trueness were found for the inner or internal parts of the prosthesis (P>.05). However, the outer and marginal parts of the prosthesis did show significant differences in trueness (P<.05). Conclusions. Milling the marginal part of the inner prosthesis was better with 2 burs, whereas milling the outer part was better with 3 burs.
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