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Three-dimensional analysis of the tooth movement and arch dimension changes in Class I malocclusions treated with first premolar extractions: a guideline for virtual treatment planning.
Am J Orthod Dentofacial Orthop. 2010 Dec; 138(6):747-57.AJ

Abstract

INTRODUCTION

Our objective was to analyze patterns of tooth movement and changes of arch dimension by superimposing 3-dimensional (3D) virtual models.

METHODS

The sample consisted of 24 Korean adults with Class I malocclusion and minimal crowding, treated by first premolar extractions, sliding mechanics (0.022-in MBT brackets [3M Unitek, Monrovia, Calif] with 0.019 × 0.025-in stainless steel wire) and moderate anchorage. The 3D virtual maxillary casts at pretreatment and posttreatment were superimposed with the best-fit method. Linear and angular variables were measured with 3Txer program (Orapix, Seoul, Korea). Wilcoxon signed rank and Mann-Whitney tests were used for statistical analysis.

RESULTS

There was no significant difference in the individual tooth movement between the right and left sides (P > 0.05). For the movement of each tooth, the maxillary central incisors (U1), lateral incisors (U2), and canines (U3) were significantly inclined lingually, extruded, and moved posteriorly and laterally. The maxillary second premolar (U5), first molar (U6), and second molar (U7) had significant mesial inward rotation, anterior movement, and contracted toward the midsagittal plane. The ratio of anteroposterior movement between the maxillary anterior and posterior teeth was 5:1. The amounts of contraction in U5, U6, and U7 were 1.4, 1.3, and 1.2 mm, respectively. When the amount of change between the adjacent teeth were compared, the linguoversion in U1 was significantly greater than that of U2. U3 and U5 showed significant opposite movements in all variables. There were differences only in angulation and vertical displacement between U6 and U7.

CONCLUSIONS

Superimposition of 3D virtual models could be a guideline for precise virtual treatment planning.

Authors+Show Affiliations

School of Dentistry, Seoul National University, Seoul, South Korea.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

21130334

Citation

Cho, Min-Young, et al. "Three-dimensional Analysis of the Tooth Movement and Arch Dimension Changes in Class I Malocclusions Treated With First Premolar Extractions: a Guideline for Virtual Treatment Planning." American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, vol. 138, no. 6, 2010, pp. 747-57.
Cho MY, Choi JH, Lee SP, et al. Three-dimensional analysis of the tooth movement and arch dimension changes in Class I malocclusions treated with first premolar extractions: a guideline for virtual treatment planning. Am J Orthod Dentofacial Orthop. 2010;138(6):747-57.
Cho, M. Y., Choi, J. H., Lee, S. P., & Baek, S. H. (2010). Three-dimensional analysis of the tooth movement and arch dimension changes in Class I malocclusions treated with first premolar extractions: a guideline for virtual treatment planning. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 138(6), 747-57. https://doi.org/10.1016/j.ajodo.2008.11.033
Cho MY, et al. Three-dimensional Analysis of the Tooth Movement and Arch Dimension Changes in Class I Malocclusions Treated With First Premolar Extractions: a Guideline for Virtual Treatment Planning. Am J Orthod Dentofacial Orthop. 2010;138(6):747-57. PubMed PMID: 21130334.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Three-dimensional analysis of the tooth movement and arch dimension changes in Class I malocclusions treated with first premolar extractions: a guideline for virtual treatment planning. AU - Cho,Min-Young, AU - Choi,Jeong-Ho, AU - Lee,Seung-Pyo, AU - Baek,Seung-Hak, PY - 2008/03/01/received PY - 2008/11/01/revised PY - 2008/11/01/accepted PY - 2010/12/7/entrez PY - 2010/12/7/pubmed PY - 2011/1/13/medline SP - 747 EP - 57 JF - American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics JO - Am J Orthod Dentofacial Orthop VL - 138 IS - 6 N2 - INTRODUCTION: Our objective was to analyze patterns of tooth movement and changes of arch dimension by superimposing 3-dimensional (3D) virtual models. METHODS: The sample consisted of 24 Korean adults with Class I malocclusion and minimal crowding, treated by first premolar extractions, sliding mechanics (0.022-in MBT brackets [3M Unitek, Monrovia, Calif] with 0.019 × 0.025-in stainless steel wire) and moderate anchorage. The 3D virtual maxillary casts at pretreatment and posttreatment were superimposed with the best-fit method. Linear and angular variables were measured with 3Txer program (Orapix, Seoul, Korea). Wilcoxon signed rank and Mann-Whitney tests were used for statistical analysis. RESULTS: There was no significant difference in the individual tooth movement between the right and left sides (P > 0.05). For the movement of each tooth, the maxillary central incisors (U1), lateral incisors (U2), and canines (U3) were significantly inclined lingually, extruded, and moved posteriorly and laterally. The maxillary second premolar (U5), first molar (U6), and second molar (U7) had significant mesial inward rotation, anterior movement, and contracted toward the midsagittal plane. The ratio of anteroposterior movement between the maxillary anterior and posterior teeth was 5:1. The amounts of contraction in U5, U6, and U7 were 1.4, 1.3, and 1.2 mm, respectively. When the amount of change between the adjacent teeth were compared, the linguoversion in U1 was significantly greater than that of U2. U3 and U5 showed significant opposite movements in all variables. There were differences only in angulation and vertical displacement between U6 and U7. CONCLUSIONS: Superimposition of 3D virtual models could be a guideline for precise virtual treatment planning. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/21130334/Three_dimensional_analysis_of_the_tooth_movement_and_arch_dimension_changes_in_Class_I_malocclusions_treated_with_first_premolar_extractions:_a_guideline_for_virtual_treatment_planning_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(10)00594-9 DB - PRIME DP - Unbound Medicine ER -