Journal of Prosthodontics News   April 20, 2021

Influence of Liquid on the Tooth Surface on the Accuracy of Intraoral Scanners: An In Vitro Study


Now online in the Journal of Prosthodontics, a report on an in vitro study that evaluated the influence of liquid on the tooth surfaces on the accuracy (trueness and precision) of intraoral scanners and the effectiveness of different drying methods on the scanning results.

A mandibular jaw model was scanned using an industrial computed tomography scanner to obtain a reference model. A scanning platform was designed to simulate three specific tooth surface states (dry, wet, blow-dry). Two kinds of liquids (ultra-pure water and artificial saliva) were used for the test.

The mean RMS values obtained from wet condition were significantly higher than those of the dry and blow-dry condition which indicates less accurate trueness and precision for wet conditions. The deviations caused by liquid were positive and mainly distributed in the pits and fissures of the occlusal surface of posterior teeth, the interproximal area of the teeth, and the margin of the abutments.

The authors conclude that blow-drying the teeth with a three-way syringe can reduce scanning errors.

Chen Y, Zhai Z, Li H, et al: Influence of liquid on the tooth surface on the accuracy of intraoral scanners: an in vitro study. J Prosthodont. Accepted Author Manuscript. https://doi.org/10.1111/jopr.13358 


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