A Novel Method for Adjusting the Taper and Adaption of Automatic Tooth Preparations with a High-Power Femtosecond Laser

• Main Authors: Fusong Yuan, Shanshan Liang, Peijun Lyu
• Format: Article
• Language: English
• Published: MDPI AG 2021-07-01
• Series: Journal of Clinical Medicine
• Subjects: adaption; laser light-off delay; taper; tooth preparation robot
• Online Access: https://www.mdpi.com/2077-0383/10/15/3389

This study explored the effect of the light-off delay setting in a robotically controlled femtosecond laser on the taper and adaption of resin tooth preparations. Thirty resin teeth (divided into six equal groups) were studied under different light-off delay conditions. Tapers from six vertical sections of the teeth were measured and compared among the light-off delay groups. The mean taper decreased from 39.268° ± 4.530° to 25.393° ± 5.496° as the light-off delay increased (<i>p</i> < 0.05). The average distance between the occlusal surfaces of the scanned data and the predesigned preparation data decreased from 0.089 ± 0.005 to 0.013 ± 0.030 μm as the light-off delay increased (<i>p</i> < 0.05). The light-off delay of the femtosecond laser is correlated with the taper and adaption of automatic tooth preparations; this setting needs to be considered during automatic tooth preparation.