Journal of Prosthodontics News   July 13, 2021

Effect of CAD/CAM Bur Deterioration on the Surface Roughness of Ceramic Crowns


Now online in the Journal of Prosthodontics, a report on the effect of repetitive milling on the surface roughness of ceramic crowns.

Milling burs gradually deteriorate with repetitive machining and their lifetime can vary greatly depending on the milled material and the size of the restoration. There are limited reports on the number of restorations that can be milled with the same set of burs before any significant change of the milled restoration.

Twenty feldspathic ceramic crowns milled with hard milling protocol, and 20 zirconia crowns milled with soft milling protocol were investigated. Atomic force microscopy was used for surface roughness measurements.

Milling zirconia and feldspathic ceramic crowns had small correlation between bur deterioration and surface roughness when the burs were used within their recommended lifetime. However, hard milled feldspathic ceramic crowns had higher surface roughness than the soft milled zirconia crowns. Bur deterioration had a larger effect on the surface roughness of the feldspathic ceramic crowns than the zirconia crowns.

Al Hamad KQ, Al Quran FA, Jwaied SZ, et al: Effect of CAD/CAM bur deterioration on the surface roughness of ceramic crowns. J Prosthodont 2021. Accepted Author Manuscript. https://doi.org/10.1111/jopr.13404


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