The Journal of Advanced Prosthodontics

The Korean Academy of Prosthodonitics (대한치과보철학회)
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Analysis of dimensions and shapes of maxillary and mandibular dental arch in Korean young adults

  • Park, Su-Jung (Department of Biomaterials and Prosthodontics, Kyung Hee University Hospital at Gangdong, School of Dentistry, Kyung Hee University) ;
  • Leesungbok, Richard (Department of Biomaterials and Prosthodontics, Kyung Hee University Hospital at Gangdong, School of Dentistry, Kyung Hee University) ;
  • Song, Jae-Won (Department of Prosthodontics, Graduate School of Dentistry, Kyung Hee University) ;
  • Chang, Se Hun (Department of Prosthodontics, Graduate School of Dentistry, Kyung Hee University) ;
  • Lee, Suk-Won (Department of Biomaterials and Prosthodontics, Kyung Hee University Hospital at Gangdong, School of Dentistry, Kyung Hee University) ;
  • Ahn, Su-Jin (Department of Biomaterials and Prosthodontics, Kyung Hee University Hospital at Gangdong, School of Dentistry, Kyung Hee University)
  • Received : 2016.09.15
  • Accepted : 2017.04.20
  • Published : 2017.10.31
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Abstract

PURPOSE. The aim of this study was to investigate dental arch dimensions and to classify arch shape in Korean young adults. MATERIALS AND METHODS. The sample included 50 Koreans with age ranging from 24 to 32 years. Maxillary and mandibular casts were fabricated using irreversible hydrocolloid and type III dental stones. Incisor-canine distance, $incisor-1^{st}$ molar distance, $incisor-2^{nd}$ molar distance, intercanine distance, $inter-1^{st}$ molar distance, and $inter-2^{nd}$ molar distance in both the maxillary and mandibular arch were measured using a three-dimensional measuring device. The dental arch was classified into three groups using five ratios from the measured values by the K-means clustering method. The data were analyzed with one-way analysis of variance. RESULTS. Arch lengths (IM2D, $incisal-2^{nd}$ molar distance) were 44.13 mm in the maxilla and 40.40 mm in the mandible. Arch widths (M2W, inter $2^{nd}$ molar width) were 64.12 mm in the maxilla and 56.37 mm in the mandible. Distribution of the dental arch form was mostly ovoid shape (maxilla 52% and mandible 56%), followed by the V-shape and the U-shape. The arch width for the U-shape was broader than for the other forms. CONCLUSION. This study establishes new reference data for dental arch dimensions for young Korean adults. The most common arch form is the ovoid type in the maxilla and mandible of Koreans. Clinicians should be aware of these references and classify arch type before and during their dental treatment for effective and harmonized results in Koreans.

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