KMID : 0361920230530010026
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Korean Journal of Orthodontics 2023 Volume.53 No. 1 p.26 ~ p.34
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Consideration of root position in virtual tooth setup for extraction treatment: A comparative study of simulated and actual treatment results
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Park Mirinae
Allareddy Veerasathpurush Atsawasuwan Phimon Lee Min-Kyeong Lee Kyung-Min Clara
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Abstract
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Objective: The purpose of the present study was to compare the root positions in virtual tooth setups using only crowns in a simulated treatment with those achieved in the actual treatment.
Methods: Pre- and post-treatment intraoral and corresponding cone beam computed tomography (CBCT) scans were obtained from 15 patients who underwent orthodontic treatment with premolar extraction. A conventional virtual tooth setup was used for the treatment simulation. Pre- and post-treatment three-dimensional digital tooth models were fabricated by integrating the patients¡¯ intraoral and CBCT scans. The simulated root positions in the virtual setup were obtained by merging the crown in the virtual setup and root in the pre-treatment tooth model. The root positions of the simulated and actual post-treatment tooth models were compared.
Results: Differences in root positions between the simulated and actual models were > 1 mm in all teeth, and statistically significant differences were observed (p < 0.05), except for the maxillary lateral incisors. The differences in the inter-root angulation were > 1¡Æ in all teeth, and statistically significant differences were observed in the maxillary and mandibular canines.
Conclusions: The virtual tooth setup using only crown data showed errors over the clinical limits. The clinical application of a virtual setup using crowns and roots is necessary for accurate and precise treatment simulation, particularly in extraction treatment.
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KEYWORD
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Digital models, Digital simulation, 3-dimensional diagnosis and treatment planning, Diagnosis and treatment planning
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