Abstract
Orthodontic treatment planning is a practice that depends on the accuracy of teeth and dental arches’ size measurement. The purpose of the study is to compare the accuracy and the duration of teeth and dental arches’ measurement, utilizing different approaches from conventional plaster models to virtual 3D models obtained by intraoral and extraoral scanners. Fifteen patients were included in the study (7 males, 8 females, mean age 21.7 ± 0.7 years), with a moderate anterior teeth crowding and class I Angle’s classification of malocclusion. Plaster models, as well as virtual 3D scans were obtained by intraoral and extraoral scanners prior to the orthodontic treatment, crown sizes of incisors, transverse and longitudinal sizes of dentitions, as well as the length of dental arches’ segments were measured, the duration of each measurement was also evaluated. Material and Methods: groups were allocated according to the four different ways the measurements were obtained: 1) biometric measurements on plaster models of the jaws; 2) virtual 3D data of the dentition using intraoral scanner; 3) 3D scanning data of plaster models; 4) 3D scanning data of silicone impressions. Results: The differences between the same type of measurements using a 3D scanner and measurements on plaster models when compared to the same control points in the oral cavity were, on average, 0.3 ± 0.01 mm. The time required to work with plaster models compared to the time taken to obtain virtual models on a 3D scanner was significantly greater, respectively, 15.3 ± 0.7 min. and 5.1 ± 0.2 min. Thus, 3D scanning is the most accurate standardized method for assessing the size of teeth and dental arches with shorter duration of manipulations, although it requires laboratory equipment and certain manual skills.
Highlights
All authors contributed to the design and implementation of the research, to the analysis of the results and to the writing of the manuscript
The authors declare no conflict of interest
Fitting accuracy of zirconia single crowns produced via digital and conventional impressions — a clinical comparative study
Summary
Составление плана лечения в ортодонтической практике зависит от точности сбора данных о размерах зубов и зубных рядов. Нами была поставлена задача объективно оценить точность и продолжительность измерений зубов и зубных дуг, используя разные подходы от классического до виртуальных 3D моделей, полученных внутриротовым и внеротовым сканированием. На гипсовых моделях челюстей до проведенной ортодонтической коррекции, а также их виртуальных 3D сканов, полученных внутриротовым и внеротовым сканерами, были измерены размеры коронок зубов, поперечные и продольные размеры зубных рядов и длина сегментов зубных дуг и продолжительность каждого измерения. Разница однотипных измерений расстояния между одинаковыми контрольными точками в полости рта с использованием 3D сканера и измерениями на гипсовых моделях зубов и зубных рядов составила в среднем 0,3 ± 0,01 мм. Оптимизация измерений зубных рядов в ортодонтической практике // Вестник Российского университета дружбы народов.
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