Impact of Early Loss of Lower First Permanent Molars on Third Molar Development and Position

Authors

  • Amanda Silva de Sousa
  • Fabrizza Roberta Lemos Araújo
  • Giulliana Simões Castro Villela
  • David Normando

Keywords:

Orthodontics, Tooth Loss, Third Molar, Radiography, Panoramic

Abstract

Objective: To evaluate the effects of unilateral loss of the lower first permanent molar (L6) on the position and development of the lower third molar (L8). Material and Methods: Fifty-four panoramic radiographs of subjects with unilateral loss of L6 were examined. The L8 on the side of the L6 loss was compared with the L8 in the hemiarch without L6 loss (contralateral). The effect of L6 loss on the positioning of L8 was examined in all the samples (n=54), whereas the effect on the development of the third molar was examined in 38 patients with L8 with incomplete root formation. The Signs statistical test was used to evaluate the comparison between loss and contralateral hemiarches. Results: In 20 (37%) of 54 subjects, the L8 was better positioned in the hemiarch with loss of the lower first molar (p<0.001) compared with the control side. In the remaining 34 subjects, no difference was found. When only the L8 considered as impacted on the control side was examined (n=30), the cases with better positioning on the side with L6 loss increased to 66.6% (p<0.001). Conclusion: The loss of lower first molars improves the position of the lower third molar during its active eruption, mainly when the lower third molar is impacted. However, L6 loss does not affect the root development of lower third molars.

References

Teo TK-Y, Ashley PF, Derrick D. Lower first permanent molars: developing better predictors of spontaneous space closure. Eur J Orthod 2016; 38(1):90-5. https://doi.org/10.1093/ejo/cjv029

Normando ADC, Maia FA, Ursi WJ, Simone L. Dentoalveolar changes after unilateral loss of the lower first permanent molar and their influence on third molar development and position. World J Orthod 2010; 11(1):55-60.

Normando ADC, Silva MC, Le Bihan R, Simone JL. Spontaneous occlusal changes after lower first permanent molar loss. Rev Dental Press Ortod Ortop Facial 2003; 8(3):15-23.

Normando D, Cavacami C. The influence of bilateral lower first permanent molar loss on dentofacial morphology- a cephalometric study. Dental Press J Orthod 2010; 15(6):100-6.

Halicioglu K, Toptas O, Akkas I, Celikoglu M. Permanent first molar extraction in adolescents and young adults and its effect on the development of third molar. Clin Oral Invest 2014; 18(5):1489-94. https://doi.org/10.1007/s00784-013-1121-1

Ghougassian SS, Ghafari JG. Association between mandibular third molar formation and retromolar space. Angle Orthod 2014; 84(6):946-50. https://doi.org/10.2319/120113-883.1

Araújo RLA, Villela GSC. A influência da perda unilateral do primeiro molar permanente inferior no padrão eruptivo do terceiro molar inferior. [Monografia]. Belém (PA): Universidade Federal do Pará; 2002. [In Portuguese].

Bishara SE. Third molars: a dilemma! Or is it? Am J Orthod Dentofacial Orthop 1999; 115(6):628-33. https://doi.org/10.1016/s0889-5406(99)70287-8

Richardson ME. The lower third molar: an orthodontic perspective. Rev Dental Press Ortod Ortop Facial 1998; 3(3):108-17.

Jälevik B, Möller M. Evaluation of spontaneous space closure and development of permanent dentition after extraction of hypomineralized permanent first molars. Int J Paediatr Dent 2007; 17(5):328-35. https://doi.org/10.1111/j.1365-263X.2007.00849.x

Abu Aihaija ES, McSheny PF, Richardson A. A cephalometric study of the effect of extraction of lower first permanent molars. J Clin Pediatr Dent 2000; 24(3):195-8.

Lanteri V, Maspero C, Cavone P, Marchio V, Farronato M. Relationship between molar deciduous teeth infraocclusion and mandibular growth: a case-control study. Eur J Paediatr Dent 2020; 21(1):39-45. https://doi.org/10.23804/ejpd.2020.21.01.08.

Farronato G, Giannini L, Galbiati G, Consonni D, Maspero C. Spontaneous eruption of impacted second molars. Prog Orthod 2011; 12(2):119-25. https://doi.org/10.1016/j.pio.2011.04.001

Sisman Y, Uysal T, Yagmur F, Ramoglu SI. Third molar development in relation to chronologic age in Turkish children and young adults. Angle Orthod 2007; 77(6):1040-5. https://doi.org/10.2319/101906-430.1

Bastos AC, Oliveira JB, Mello KFR, Leão PB, Artese F, Normando D. The ability of orthodontists and oral/ maxillofacial surgeons to predict eruption of lower third molar. Prog Orthod 2016; 17(21):1-5. https://doi.org/10.1186/s40510-016-0134-0

Yavuz I, Baydas B, Ikbal A, Dagsuyu IM, Ceylan I. Effects of early loss of permanent first molars on the development of third molars. Am J Orthod Dentofacial Orthop 2006; 130(5):634-8. https://doi.org/10.1016/j.ajodo.2005.02.026

Nolla CM. The development of permanent teeth. J Dent Child 1960; 4:254-66.

Bayram M, Özer M, Selim A. Effects of first molar extraction on third molar angulation and eruption space. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2009; 107(2):e14-20. https://doi.org/10.1016/j.tripleo.2008.10.011

Ay S, Agar U, Biçakçi AA, Köşger HH. Changes in mandibular third molar angle and position after unilateral mandibular first molar extraction. Am J Orthod Dentofacial Orthop 2006; 129(1):36-41. https://doi.org/10.1016/j.ajodo.2004.10.010

Baik UB, Kang JH, Lee UL, Vaid NR, Kim YJ, Lee DY. Factors associated with spontaneous mesialization of impacted mandibular third molars after second molar protraction. Angle Orthod 2020; 90(2):181-6. https://doi.org/10.2319/050919-322.1

Baik UB, Kook YA, Bayome M, Park JU, Park JH. Vertical eruption patterns of impacted mandibular third molars after the mesialization of second molars using miniscrews. Angle Orthod 2016; 86(4):565-70. https://doi.org/10.2319/061415-399.1

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Published

2021-11-13

How to Cite

de Sousa, A. S. ., Araújo, F. R. L. ., Villela, G. S. C. ., & Normando, D. . (2021). Impact of Early Loss of Lower First Permanent Molars on Third Molar Development and Position. Pesquisa Brasileira Em Odontopediatria E Clínica Integrada, 21, e0072. Retrieved from https://revista.uepb.edu.br/PBOCI/article/view/670

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