Abstract
Statement of problem
Intraoral scanners (IOSs) have been used in dentistry for diagnostic and treatment
purposes; however, the influence of environmental factors such as humidity or temperature
on the accuracy of intraoral scanning is uncertain.
Purpose
The purpose of this in vitro study was to evaluate the influence of relative humidity
and ambient temperature on the accuracy, scanning time, and number of photograms of
dentate complete arch intraoral digital scans.
Material and methods
A completely dentate mandibular typodont was digitized by using a dental laboratory
scanner. Four calibrated spheres were attached following the International Organization
for Standardization (ISO) standard 20 896. A watertight box was designed to simulate
4 different relative humidity conditions (50%, 70%, 80%, and 90%) (n = 30). An IOS
(TRIOS 3) was used to obtain a total of 120 complete arch digital scans (n = 120).
Scanning time and number of photograms of each specimen were recorded. All the scans
were exported and compared with the master cast by using a reverse engineering software
program. The linear distances among the reference spheres were used to calculate trueness
and precision. A unifactorial analysis of variance (ANOVA) and Levene tests followed
by the post hoc Bonferroni test were used to analyze trueness and precision data,
respectively. A unifactorial ANOVA followed by a post hoc Bonferroni test was also
conducted to analyze scanning time and the number of photogram data.
Results
Statistically significant differences were found in trueness, precision, number of
photograms, and scanning time (P<.05). Regarding trueness and precision, significant differences were found between
the 50% and 70% relative humidity groups and the 80% and 90% relative humidity groups
(P<.01). Regarding scanning time and number of photograms, significant differences were
obtained among all groups, except between the 80% and 90% relative humidity groups
(P<.01).
Conclusions
The relative humidity conditions tested influenced accuracy, scanning time, and number
of photograms in complete arch intraoral digital scans. High relative humidity conditions
resulted in the decreased scanning accuracy, longer scanning time, and greater number
of photograms of complete arch intraoral digital scans.
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Article info
Publication history
Published online: May 18, 2023
Publication stage
In Press Corrected ProofFootnotes
Funding: This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
The authors did not have any conflict of interest, financial or personal, in any of the materials described in the study.
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© 2023 by the Editorial Council for The Journal of Prosthetic Dentistry.
