The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Three-dimensional evaluation of the relationship between dental and basal arch forms in normal occlusion

정상교합자에서 치열궁과 기저궁 관계의 삼차원적 평가

  • Kim, Kwang-Yoo (Department of Orthodontics, College of Medicine, The Catholic University of Korea) ;
  • Bayome, Mohamed (Department of Orthodontics, College of Medicine, The Catholic University of Korea) ;
  • Kim, Kon-Tae (Department of Orthodontics, Graduate School of Clinical Dental Science, The Catholic University of Korea) ;
  • Han, Seong-Ho (Department of Orthodontics, St. Vincent Hospital, The Catholic University of Korea) ;
  • Kim, Yoon-Ji (Department of Orthodontics, Seoul St. Mary's Hospital, The Catholic University of Korea) ;
  • Baek, Seung-Hak (Department of Orthodontics, School of Dentistry, Seoul National University) ;
  • Kook, Yoon-Ah (Department of Orthodontics, Seoul St. Mary's Hospital, The Catholic University of Korea)
  • Received : 2011.01.24
  • Accepted : 2011.03.31
  • Published : 2011.08.30
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Abstract

Objective: The purposes of this study were to evaluate the relationship between the dental and basal arch forms; to analyze their differences in the tapered, ovoid, and square arch forms in normal occlusion by using three-dimensional (3D) virtual models; and to test the hypothesis that the overjet and maxillomandibular basal arch width difference have a significantly positive correlation. Methods: Seventy-seven normal occlusion plaster casts were examined by 3D scanning. Facial axis (FA) and WALA points were digitized using the Rapidform 2006 software. The dimensions of the dental and basal arches and the overjet were measured. The samples were classified into 3 groups according to arch forms: tapered (n = 20), ovoid (n = 20), and square (n = 37). Analysis of variance (ANOVA) was used to compare the dental and basal arch dimensions. The Pearson correlation coefficients between the intercanine as well as the intermolar widths at the FA and WALA points were calculated. Results: With regard to the basal arch dimensions, the tapered arch form showed a larger mandibular intermolar depth than the ovoid. Strong correlations were noted between the basal and dental intermolar widths in both the upper and lower arches (r = 0.83 and 0.85, respectively). Moderate correlation was found between the upper and lower intercanine widths (r = 0.65 and 0.48, respectively). Conclusions: The 3 dental arch form groups differed only in some dimensions of the skeletal arch. Moderate correlations were found between the basal and dental intercanine widths. These findings suggest that the basal arch may not be a principle factor in determining the dental arch form.

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