Radiographic evaluation of the correlation between the status of mandibular third molars and the lesion of the mandibular second molars

doi:10.19438/j.cjoms.2018.041.013

Abstract

Abstract: PURPOSE:To evaluate the correlation between the eruption status of the mandibular third molars (M3Ms) and distal caries, periodontal defects, external root resorption in the mandibular second molars (M2Ms) and provide references for early removal of the high risk M3Ms to prevent damage of M2Ms. METHODS: 3000 patients (4028 mandibular third molars) were involved in this study. Panoramic radiography images were used to analyze the location of the mandibular third molars (Winter's classification) and distal caries, periodontal defects, external root resorption in the mandibular second molars. Chi-square test (R programming language, Version 3.4.5) was used to analyze the relation between pathology of M2Ms and classification of M3Ms. RESULTS: Different Winter's classification of mandibular third molars were related to the lesion of the mandibular second molars (P<0.001). Distal caries in the mandibular second molars were most prevalent when the mandibular third molars were mesioangular (P<0.001). Periodontal defects in the mandibular second molars were most prevalent when the mandibular third molars were vertical or distoangular (P<0.001). External root resorption in the mandibular second molars were most prevalent when the mandibular third molars were inverted (P<0.001). CONCLUSIONS: Distal caries, periodontal defects, external root resorption in the mandibular second molars were closely related to the classification of mandibular third molars. Impacted mandibular third molars should be extracted as early as possible.

Key words: Mandibular third molar, Mandibular second molar, Distal caries, Periodontal disease, External root resorption, Winter's classification

CLC Number:

R782.13

LI Chen-lin, XU Guang-zhou, YANG Chi, WANG Yong. Radiographic evaluation of the correlation between the status of mandibular third molars and the lesion of the mandibular second molars[J]. China Journal of Oral and Maxillofacial Surgery, 2018, 16(4): 357-361.

References

[1] Shah AP, Parekh PA.An evaluation of genesis and impaction of 3rd molar in adolescents[J]. Int J Med Dent Sci, 2014, 3(2): 329-334.
[2] Marques J, Montserrat-Bosch M, Figueiredo R, et al.Impacted lower third molars and distal caries in the mandibular second molar. Is prophylactic removal of lower third molars justified?[J]. J Clin Exp Dent, 2017, 9(6): e794-e798.
[3] Punjabi SK, Khoso NA, Butt AM, et al.Third molar impaction: evaluation of symptoms and pattern of impaction of mandibular third molar teeth[J]. J Liaquat Uni Med Health Sci, 2013, 12(1):26-29.
[4] Nakayama K, Nonoyama M, Takaki Y, et al.Assessment of the relationship between impacted mandibular third molars and inferior alveolar nerve with dental 3-dimensional computed tomography[J]. J Oral Maxillofac Surg, 2009, 67(12): 2587-2591.
[5] Ventä I, Ylipaavalniemi P, Turtola L.Long-term evaluation of estimates of need for third molar removal[J]. J Oral Maxillofac Surg, 2000, 58(3): 288-291.
[6] Rafetto LK.Removal of asymptomatic third molars: a supporting view[J]. J Oral Maxillofac Surg, 2006, 64(12):1811-1815.
[7] Bouloux GF, Busaidy KF, Beirne OR, et al.What is the risk of future extraction of asymptomatic third molars? A systematic review[J]. J Oral Maxillofac Surg, 2015, 73(5): 806-811.
[8] van der Linden W, Cleaton-Jones P, Lownie M. Diseases and lesions associated with third molars. Review of 1001 cases[J]. Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 1995, 79(2):142-145.
[9] McArdle LW, Renton TF. Distal cervical caries in the mandibular second molar: an indication for the prophylactic removal of third molar teeth[J]. Br J Oral Maxillofac Surg, 2014, 52(2): 185-189.
[10] Nunn ME, Fish MD, Garcia RI, et al.Retained asymptomatic third molars and risk for second molar pathology[J]. J Dent Res, 2013, 92(12): 1095-1099.
[11] Syed KB, Alshahrani FS, Alabsi WS, et al. Prevalence of distal caries in mandibular second molar due to impacted third molar [J]. J Clin Diagn Res, 2017, 11(3): ZC28-ZC30.
[12] Kang F, Huang C, Sah MK, et al.Effect of eruption status of the mandibular third molar on distal caries in the adjacent second molar[J]. J Oral Maxillofac Surg, 2016, 74(4): 684-692.
[13] Golden BA, Baldwin C, Sherwood C, et al.Monitoring for periodontal inflammatory disease in the third molar region[J]. J Oral Maxillofac Surg, 2015, 73(4): 595-599.
[14] White RP Jr, Fisher EL, Phillips C, et al.Visible third molars as risk indicator for increased periodontal probing depth[J]. J Oral Maxillofac Surg, 2011, 69(1): 92-103.
[15] Tabrizi R, Arabion H, Gholami M.How will mandibular third molar surgery affect mandibular second molar periodontal parameters?[J]. Dent Res (Isfahan), 2013, 10(4): 523-526.
[16] Nitzan D, Keren T, Marmary Y.Does an impacted tooth cause root resorption of the adjacent one?[J]. Oral Surg Oral Med Oral Pathol, 1981, 51(3): 221-224.
[17] Nemcovsky CE, Tal H, Pitaru S.Effect of non-erupted third molars on roots of approximal teeth. A radiographic, clinical and histologic study[J]. J Oral Pathol Med, 1997, 26(10): 464-469.
[18] Wang D, He X, Wang Y, et al.External root resorption of the second molar associated with mesially and horizontally impacted mandibular third molar: evidence from cone beam computed tomography[J]. Clin Oral Investig, 2017, 21(4): 1335-1342.
[19] Alqerban A, Jacobs R, Fieuws S, et al, Comparison of two cone beam computed tomographic systems versus panoramic imaging for localization of impacted maxillary canines and detection of root resorption[J]. Eur J Orthod, 2011, 33(1): 93-102.
[20] Haug RH, Abdul-Majid J, Blakey GH, et al.Evidenced-based decision making: the third molar[J]. Dent Clin North Am, 2009, 53(1): 77-96.
[21] Pippi R.Effectiveness of a personalized device in the evaluation of mandibular second molar periodontal healing after surgical extraction of adjacent third molar[J]. Ann Stomatol (Roma), 2014, 4(3-4):218-229.