Journal of the korean academy of Pediatric Dentistry (대한소아치과학회지)

Korean Academy of Pediatric Dentistry (대한소아치과학회)
권호 표지
DOI QR코드

DOI QR Code

Analysis of Prevalence of Pyramidal Molars in Adolescent

청소년들에서 pyramidal molar 유병률의 분석

  • Kwon, Woojin (Department of Pediatric Dentistry, College of Dentistry, Yonsei University) ;
  • Choi, Hyung-Jun (Department of Pediatric Dentistry, College of Dentistry, Yonsei University) ;
  • Lee, Jaeho (Department of Pediatric Dentistry, College of Dentistry, Yonsei University) ;
  • Song, Je Seon (Department of Pediatric Dentistry, College of Dentistry, Yonsei University)
  • 권우진 (연세대학교 치과대학 소아치과학교실) ;
  • 최형준 (연세대학교 치과대학 소아치과학교실) ;
  • 이제호 (연세대학교 치과대학 소아치과학교실) ;
  • 송제선 (연세대학교 치과대학 소아치과학교실)
  • Received : 2020.04.10
  • Accepted : 2020.05.15
  • Published : 2020.11.30
Download PDF
⟨ Previous Next ⟩

Abstract

A pyramidal molar is which has completely fused roots with a solitary enlarged canal. The purpose of this retrospective study was to assess the prevalence and characteristics of pyramidal molars among adolescent. A total of 1,612 patients' panoramic radiographs were screened. A total of 12,896 first and second molars were evaluated. The relative incidence and the correlations regarding the location of pyramidal molar (maxillary versus mandibular) and gender were analyzed using the chi-square test. The overall incidence of patients with pyramidal molars was 1.49%. 24 patients were found to have a pyramidal molar and it was more prevalent in women (18 women and 6 men). The prevalence of pyramidal molars from all first and second molars examined was 0.31%. 88 percent of pyramidal molars occurred in maxilla. All pyramidal molars were second molar. Pyramidal molar has a relatively poor periodontal prognosis compared with common multi-rooted teeth and it is important to understand the structural characteristics of root canal during pulp treatment. Clinicians should be able to understand the anatomical properties of pyramidal molar and apply it to treatment and prognostic evaluation.

Pyramidal molar는 완전히 융합된 하나의 치근과 근관을 갖는 대구치를 의미한다. 이번 연구의 목적은 청소년들에서 Pyramidal molar의 유병률과 특성을 파악하는 것이다. 이 연구에서는 연세대학교 치과대학병원 소아치과에 내원한 만 13세에서 16세 사이의 1,612명의 파노라마가 분석되었고 총 12,896개의 대구치(제1,2대구치)가 평가되었다. Pyramidal molar의 발생 위치와 성별에 대한 상대적인 유병률을 계산하였고 카이제곱 검정을 사용하여 상관관계를 분석하였다. Pyramidal molar의 유병률은 1.49%였으며 Pyramidal molar가 발견된 24명의 환자 중 남성이 6명, 여성이 18명으로 여성에서 호발하였다. 전체 대구치(제3대구치 제외)에서 Pyramidal molar는 0.31%를 차지하였다. Pyramidal molar 중 88%가 상악에서 발견되었고 모든 Pyramidal molar는 제2대구치에서 나타났다. Pyramidal molar는 일반적인 다근치에 비해 치주적인 예후가 좋지 못하며 치수치료시 구조적 특성에 대한 이해가 중요하다. 임상가들은 pyramidal molar의 해부학적 특성을 이해하고 치료 및 예후 평가에 적용할 수 있어야 한다.

Keywords

References

  1. Klein OD, Oberoi S, Huysseune A, et al. : Developmental disorders of the dentition: an update. Am J Med Genet C Semin Med Genet, 163:318-332, 2013. https://doi.org/10.1002/ajmg.c.31382
  2. Lind V : Short root anomaly. Scand J Dent Res, 80:85-93, 1972.
  3. Shaw JC : Taurodont Teeth in South African Races. J Anat, 62:476-498 471, 1928.
  4. Ackerman JL, Ackerman AL, Ackerman AB : Taurodont, pyramidal and fused molar roots associated with other anomalies in a kindred. Am J Phys Anthropol, 38:681-694, 1973. https://doi.org/10.1002/ajpa.1330380305
  5. Ten Cate AR : Oral histology : development, structure, and function, 4th ed. Mosby, 532, 1994.
  6. Kulkarni M, Agrawal T, Kheur S : Tooth agenesis: newer concept. J Clin Pediatr Dent, 36:65-69, 2011. https://doi.org/10.17796/jcpd.36.1.p74362q544210p33
  7. Nguyen AM, Tiffee JC, Arnold RM : Pyramidal molar roots and canine-like dental morphologic features in multiple family members: a case report. Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 82:411-416, 1996. https://doi.org/10.1016/S1079-2104(96)80306-4
  8. Metgud S, Metgud R, Rani K : Management of a patient with a taurodont, single-rooted molars associated with multiple dental anomalies: a spiral computerized tomography evaluation. Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 108:81-86, 2009. https://doi.org/10.1016/j.tripleo.2009.01.013
  9. Shigli A, Agrawal A : Permanent maxillary first molar with single root and single canal: a case report of a rare morphology. J Indian Soc Pedod Prev Dent, 28:121-125, 2010. https://doi.org/10.4103/0970-4388.66755
  10. de la Torre F, Cisneros-Cabello R, Aranguren JL, et al. : Single-rooted maxillary first molar with a single canal: endodontic retreatment. Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 106:66-68, 2008. https://doi.org/10.1016/j.tripleo.2007.12.024
  11. Burklein S, Breuer D, Schafer E : Prevalence of taurodont and pyramidal molars in a German population. J Endod , 37:158-162, 2011. https://doi.org/10.1016/j.joen.2010.10.010
  12. Sood PB, Sood M : Taurodontism and pyramidal molars. J Indian Soc Pedod Prev Dent, 10:25-27, 1992.
  13. Sarr M, Toure B, Kane AW, et al. : Taurodontism and the pyramidal tooth at the level of the molar. Prevalence in the Senegalese population 15 to 19 years of age. Odontostomatol Trop, 23:31-34, 2000.
  14. Kim SY, Kim BS, Woo J, Kim Y : Morphology of mandibular first molars analyzed by cone-beam computed tomography in a Korean population: variations in the number of roots and canals. J Endod, 39:1516-1521, 2013. https://doi.org/10.1016/j.joen.2013.08.015
  15. Kim Y, Lee SJ, Woo J : Morphology of maxillary first and second molars analyzed by cone-beam computed tomography in a korean population: variations in the number of roots and canals and the incidence of fusion. J Endod, 38:1063-1068, 2012. https://doi.org/10.1016/j.joen.2012.04.025
  16. Zhang R, Yang H, Yu X, et al. : Use of CBCT to identify the morphology of maxillary permanent molar teeth in a Chinese subpopulation. Int Endod J, 44:162-169, 2011. https://doi.org/10.1111/j.1365-2591.2010.01826.x
  17. Demirjian A, Goldstein H, Tanner JM : A new system of dental age assessment. Hum Biol, 45:211-227, 1973.
  18. Klein U, Paimagham B, Blumhagen R, et al. : Pyramidal and Taurodont Molars and Their Association With Other Tooth Anomalies. Pediatr Dent, 39:46-52, 2017.
  19. Stahl F, Grabowski R, Wigger K : Epidemiological significance of Hoffmeister's "Genetically determined predisposition to disturbed development of the dentition". J Orofac Orthop, 64:243-255, 2003. https://doi.org/10.1007/s00056-003-0220-z
  20. Jing YN, Ye X, Liu DG, et al. : Cone-beam computed tomography was used for study of root and canal morphology of maxillary first and second molars. Beijing Da Xue Xue Bao Yi Xue Ban, 46:958-962, 2014.
  21. Witkop CJ, Jr., Keenan KM, Cervenka J, Jaspers MT : Taurodontism: an anomaly of teeth reflecting disruptive developmental homeostasis. Am J Med Genet Suppl, 4:85-97, 1988.
  22. Steele-Perkins G, Butz KG, Lyons GE, et al. : Essential role for NFI-C/CTF transcription-replication factor in tooth root development. Mol Cell Biol, 23:1075-1084, 2003. https://doi.org/10.1128/MCB.23.3.1075-1084.2003
  23. Price JA, Wright JT, Walker SJ, et al. : Tricho-dento-osseous syndrome and amelogenesis imperfecta with taurodontism are genetically distinct conditions. Clin Genet, 56:35-40, 1999. https://doi.org/10.1034/j.1399-0004.1999.550105.x
  24. Lee HS, Kim SH, Kim SO, et al. : A new type of dental anomaly: molar-incisor malformation (MIM). Oral Surg Oral Med Oral Pathol Oral Radiol, 118:101-109, 2014. https://doi.org/10.1016/j.oooo.2014.03.014
  25. Chung YM, Jeong SN : Analysis of periodontal attachment loss in relation to root form abnormalities. J Periodontal Implant Sci, 43:276-282, 2013. https://doi.org/10.5051/jpis.2013.43.6.276
  26. Meng H, Xu L, Li Q, et al. : Determinants of host susceptibility in aggressive periodontitis. Periodontol 2000, 43:133-159, 2007. https://doi.org/10.1111/j.1600-0757.2006.00204.x
  27. Lang NP, Tonetti MS : Periodontal risk assessment (PRA) for patients in supportive periodontal therapy (SPT). Oral Health Prev Dent, 1:7-16, 2003.
  28. Jo HH, Min JB, Hwang HK : Analysis of C-shaped root canal configuration in maxillary molars in a Korean population using cone-beam computed tomography. Restor Dent Endod , 41:55-62, 2016. https://doi.org/10.5395/rde.2016.41.1.55
  29. De Moor RJ : C-shaped root canal configuration in maxillary first molars. Int Endod J, 35:200-208, 2002. https://doi.org/10.1046/j.1365-2591.2002.00461.x
  30. Gupta SK, Saxena P : Prevalence of Taurodontism and its Association with Various Oral Conditions in an Indian Population. Oral Health Prev Dent, 11:155-160, 2013. https://doi.org/10.3290/j.ohpd.a29363
  31. Haskova JE, Gill DS, Figueiredo JA, et al. : Taurodontism: a review. Dent Update, 36:235-236, 239-240, 243, 2009. https://doi.org/10.12968/denu.2009.36.4.235
  32. McNamara CM, Garvey MT, Winter GB : Root abnormalities, talon cusps, dentes invaginati with reduced alveolar bone levels: case report. Int J Paediatr Dent, 8:41-45, 1998. https://doi.org/10.1046/j.1365-263X.1998.00060.x
  33. Seow WK, Lai PY : Association of taurodontism with hypodontia: a controlled study. Pediatr Dent, 11:214-219, 1989.
  34. Bahrololoomi Z, Ghafourifard R, Soleimani AA : Primary mandibular first molar with single root and single canal: a case report of a rare morphology. J Dent (Tehran), 11:355-360, 2014.