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. 2016 May;115(5):624-9.
doi: 10.1016/j.prosdent.2015.10.014. Epub 2016 Jan 7.

Trueness of Milled Prostheses According to Number of Ball-End Mill Burs

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Trueness of Milled Prostheses According to Number of Ball-End Mill Burs

Chong-Myeong Kim et al. J Prosthet Dent. .

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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