Journal of Digital Convergence (디지털융복합연구)

The Society of Digital Policy and Management (한국디지털정책학회)
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Convergence analysis of cusp variation symmetry of the mandibular second premolars using 3-dimensional virtual models - Focusing on college students in Jeollabuk-do

3차원 가상모형을 이용한 하악 제2소구치 교두 변이 대칭성에 대한 융복합적 분석 - 전북지역 일부 대학생을 중심으로

  • Nam, Shin-Eun (Department of Dental lab, Wonkwang Health Science University)
  • 남신은 (원광보건대학교 치기공과)
  • Received : 2021.12.09
  • Accepted : 2022.02.20
  • Published : 2022.02.28
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Abstract

This study aimed to qualitative analyze the cusp variation pattern of the mandibular second premolars using a three-dimensional virtual models, and to analyze the left-right bilateral symmetry with a quantitative analysis of the tooth surface area according to the cusp variation. 127 virtual mandibular second premolars were prepared and individual absolute/relative cusp area, total crown area and groove form were analyzed using RapidForm2004(INUS technology INC, Seoul, Korea). Independent t-test, Kruskal-Wallis test and chi-square were performed. As a result, the groove form showed high bilateral symmetry between the left and right sides. Based on the left side of groove form, the bilateral symmetry was 100.0% for the U pattern, and 73.7% for the H patterned, and 78.9% for the Y pattern(p<.001). The finding could be as a meaningful reference for manufacturing CAD/CAM dental prostheses, and it is expected that further studies will be conducted on more samples including the mandibular second premolar immediately after eruption.

본 연구는 3차원 가상모형을 이용하여 하악 제2소구치 교두 변이 양상을 정성적으로 분석하고, 교두 변이에 따른 치아 표면적의 정량적 분석과 함께 좌·우측 대칭성을 분석하고자 하였다. 127개의 하악 제2소구치 가상치아를 준비한 후, RapidForm2004(INUS technology INC, Seoul, Korea)을 이용하여 각 교두의 절대적/상대적 단면적, 전체 치관 단면적, 교합면의 중심구 형태 등을 분석하였다. 통계방법은 Independent t-test, Kruskal-Wallis test 및 교차분석을 시행하였다. 연구 결과, 중심구의 형태는 양측간 높은 대칭성을 보였다. 좌측에서 U 형태이면 우측도 100.0% U 형태를 나타냈으며, 나머지 H 형태와 Y 형태는 각각 73.7%, 78.9% 비율로 양측간 동일한 중심구 형태를 나타냈다(p<.001). 본 연구에서 얻은 결과는 CAM/CAM을 이용한 보철물 제작 시 참고자료로 활용이 가능할 것이며, 향후 맹출 직후의 하악 제2소구치를 포함한 더 많은 샘플을 대상으로 한 후속연구가 이루어지기를 기대한다.

Keywords

Acknowledgement

This paper was supported by Wonkwang Health Science University in 2021.

References

  1. S. Y. Kim, Y. J. Lim, S. H. Lee, N. Y. Lee & M. G. Jih. (2019). Comparison of crown shape and amount of yooth reduction for primary anterior prefabricated crowns. Journal of the Korean Academy of Pediatruc Dententistry, 46(1), 64-75. DOI : 10.5933/JKAPD.2019.46.1.64
  2. T. Y. Lee, M. Y. Kim, S. H. Kim & J. H. Kim. (2020). Evaluation of root and root canal morphology of elderly Korean patients maxillary molars using cone-beam computed tomography. Journal of the Korean Academy of Pediatruc Dententistry 58(2), 95-102. DOI : 10.4047/jkap.2020.58.2.95
  3. C. G. NCT II & G. R. Scott. (1991). Scoring procedure for key morphological traits of the permanent dentition: The arizona state university dental anthroplolgy system. New York : Wiley-Liss.
  4. M. K. Pang. (2018). The Dental Anthropological Characteristics of Minority Natives in the Arctic Coast. Korean Journal of Siberian studies, 22(2), 181-207.
  5. Y. Kitagawa. (2000). Nonmetric morphological characters of deciduous teeth in Japan; diachronic evidence of the past 4000 years. Internationl Journal of Osteoarchaeology, 10(4), 242-253. DOI : 10.1002/1099-1212(200007/08)10:4<242::AID-OA526>3.0.CO;2-A
  6. L. Aguirre, D. Castillo, D. Solarte & F. Moreno. (2006). Frequency and Variability of Five Non-Metric Dental Crown Traits in the Primary and Permanent Dentitions of a Racially Mixed Population from Cali, Colombia. Dental Anthropology, 19(2), 39-48. DOI : 10.4103/jomfp.JOMFP_144_18
  7. M. F. Khamis, J. A. Taylor, A. R. Samsudin & G. C. Townsend. (2018). Variation in dental crown morphology in Malaysian populations. Dental Anthropology, 19(2), 49-60. DOI : 10.26575/daj.v19i2.120
  8. H. Y. Park. (2013). Variation of mandibular premolars in Koreans. Master's dissertation. Chonnam National University, Gwangju.
  9. H. I. Yoo, D. W. Yang, M. Y. Lee, M. S. Kim & S. H. Kim. (2016). Morphological analysis of the occlusal surface of maxillary molars in Koreans. Archives of Oral Biology, 67, 15-21. DOI : 10.1016/j.archoralbio.2016.02.020
  10. H. I. Yoo, J. H. Kim & S. H. Kim. (2014). Variation in the cusps of mandibular molars in Koreans. Korean Journal of Physical Anthropology, 27(3), 155-163. DOI : 10.11637/kjpa.2014.27.3.155
  11. S. E. Nam. (2020). Three-dimensional analysis of the cusp variation patterns of mandibular second premolar in Koreans. Journal of Technologic Dentistry, 42(3), 220-227. DOI : 10.14347/jtd.2020.42.3.220
  12. O. S. Yoo. (2008). A study on the morphological standardization and the mechanical behaviors of the mandibular teeth. Master's dissertation. Ajou University, Suwon.
  13. S. P. Lee. (2016). Dental anatomy: teeth, a beautiful harmony between function and shape. Paju : Soomoonsa.
  14. R. C. Wheeler. (1958). A textbook of dental anatomy and physiology. 3rd ed. Philadelphia : W. B. Saunders Company.
  15. E. J. Kwon et al. (2019). Dental Morphology. Seoul : Jisung.
  16. H. I. Yoo, S. H. Kim & H. Y. Pak. (2015). Occlusal surface analysis of mandibular promlars in Koreans. Korean Journal of Physical Anthropology, 28(3), 145-153. DOI : 10.11637/kjpa.2015.28.3.145
  17. K. Nojima, R. P. McLaughlin, Y. Isshiki & P. M. Sinclair. (2001). A comparative study of Caucasian and Japanese mandibular clinical arch forms. The Angle Orthodontist, 71(3), 195-200.
  18. D. L. Robinson, P. G. Blackwell, E. C. Stillman & A. H. Brook. (2002). Impact of landmark reliability on the planar Procrustes analysis of tooth shape. Archives of Oral Biology, 47(7), 545-554. DOI : 10.1016/S0003-9969(02)00038-9