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The association between orthodontic treatment and third molar position, inferior alveolar nerve involvement, and prediction of wisdom tooth eruption

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Abstract

Purpose

The present study aims to compare mandibular third molar position in relation to the mandibular ramus, mandibular third molar angulation, potential impaction and nerve involvement in orthodontic treated versus untreated subjects.

Methods

The sample consisted of 300 panoramic radiographs 119 males (mean age 16.9 years); 181 females (mean age 16.8 years), contrasting an orthodontically treated (n = 150) to an untreated group (n = 150). Only patients with a full mandibular dentition were included. Pell and Gregory (Dent Digest 39: 330–338, 1933), Winter (Principles of exodontia as applied to the impacted third molars, 1926) and Félez-Gutierrez modified by Gomes (Study of nerve lesion following mandibular third molar surgery, 2011) classifications were used. Radiological information was used to predict eruption. Data was analyzed using frequency analysis and Chi-square testing.

Results

220 lower wisdom teeth (73.3 %) were impacted in the treated group, opposed to 236 impacted lower wisdom teeth (78.7 %) in the untreated group. A close relation with the mandibular nerve was observed 125 times (41.7 %) in the treated group, opposed to an incidence of 112 (37.3 %) in the untreated group. The differences were not statistically significant. A partial eruption was predicted for 153 (51 %) lower wisdom teeth in the treated group, opposed to 106 (35 %) in the untreated group and an impossible eruption in 67 (22 %) in the treated group, opposed to 130 (43 %). These differences were statistically significant (p < 0.05).

Conclusions

The significant outcomes indicate that orthodontically treated patients may develop a higher likeliness to partially erupted third molars, which potentially leads to local clinical morbidities, such as pericoronitis and caries on adjacent teeth. In this context, it may support third molar extractions at an earlier stage in particular cases.

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Conflict of interest

The authors declare that they have no conflict of interest.

Ethical statement

The present research complies with the current ethical laws of the country in which it was performed: Ethical approval was given by the medical ethical commission of the University hospital KULeuven. The study complies with the ICH-GCP-principles (International Conference on Harmonization Guidelines on Good clinical Practice). The reference number is S53686.

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Authors and Affiliations

  1. Dentistry, Department of Oral Health Sciences-Orthodontics, KU Leuven and Dentistry UZ Leuven, Kapucijnenvoer 7, 3000, Leuven, Belgium

    Annelie Miclotte & Guy Willems

  2. Dentistry, School of Health and Biosciences, Pontifícia Universidade Católica do Paraná, Curitiba, Brazil

    Ademir Franco

  3. OIC, OMFS IMPATH Research Group, Department Imaging and Pathology, Faculty of Medicine, University of Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium

    Maria Eugenia Guerrero & Reinhilde Jacobs

  4. Department of Periodontology, School of Dentistry, Cientifica del Sur University, Lima, Peru

    Maria Eugenia Guerrero

Authors
  1. Annelie Miclotte
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  2. Ademir Franco
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  3. Maria Eugenia Guerrero
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  4. Guy Willems
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  5. Reinhilde Jacobs
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Correspondence to Annelie Miclotte.

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Miclotte, A., Franco, A., Guerrero, M.E. et al. The association between orthodontic treatment and third molar position, inferior alveolar nerve involvement, and prediction of wisdom tooth eruption. Surg Radiol Anat 37, 333–339 (2015). https://doi.org/10.1007/s00276-014-1357-8

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  • DOI: https://doi.org/10.1007/s00276-014-1357-8

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