Evaluation of the positions of impacted third molars according to the classifications of Winter and Pell & Gregory in panoramic radiographs
Evaluation of the positions of impacted third molars according to the classifications of Winter and Pell & Gregory in panoramic radiographs
DOI:
https://doi.org/10.51473/rcmos.v1i2.2025.1611Keywords:
Impacted molars, Winter classification, Pell & Gregory classification; panoramic radiography.Abstract
Third molars, commonly known as wisdom teeth, are the teeth most frequently impacted in the oral cavity, and may be partially or totally erupted due to anatomical, genetic, and functional factors. This condition is relevant in dentistry because it is associated with complications such as pain, infection, caries, and root resorption. The Winter and Pell & Gregory classifications are widely used to describe the position and degree of impact of these teeth, assisting in diagnosis and surgical planning. The present study aims To analyze, through an integrative literature review, the use of panoramic radiography in the evaluation of impacted mandibular third molars, considering the Winter and Pell & Gregory classifications, and to discuss its relevance for diagnosis, surgical planning, and complication prevention.The research was conducted between May 2024 and August 2025, in the PubMed, SciELO, Scopus, and ScienceDirect databases, including articles published between 2016 and 2024 in Portuguese and English. The results indicated a high prevalence of impacted third molars, mainly lower ones, with a predominance of mesioangular inclinations according to Winter and classes B and 2 according to Pell & Gregory. Panoramic radiographs proved to be effective for initial diagnosis, while cone beam computed tomography was recommended for more complex cases. The Winter and Pell & Gregory classifications remain essential in dental practice, offering diagnostic standardization that contributes to communication between professionals and safe surgical planning. The integration of radiographic examination and clinical judgment is indispensable for decision-making, preventing complications, and promoting oral health. Future studies are needed to correlate radiographic position with long-term clinical outcomes.
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BRASIL, D. M.; NASCIMENTO, E. H.; GAETA-ARAUJO, H.; OLIVEIRA-SANTOS, C.; MARIA DE ALMEIDA, S. A imagem panorâmica é equivalente à tomografia computadorizada de feixe cônico para classificação de terceiros molares inferiores impactados? Journal of Oral and Maxillofacial Surgery, 2019.
BUSHBERG, J. T. Décima primeira palestra anual de Warren K. Sinclair: ciência, proteção radiológica e NCRP: construindo sobre o passado, olhando para o futuro. Health Physics, 2015.
COUTO, D. A. F. et al. Comparison of Panoramic Radiography and Cone Beam Computed Tomography for Lower Third Molar Assessment Among Different Dental Specialists. Journal of Oral and Maxillofacial Surgery: Official Journal of the American Association of Oral and Maxillofacial Surgeons, v. 83, n. 8, p. 1000–1011, ago. 2025. DOI: https://doi.org/10.1016/j.joms.2025.05.003
CHOI, E. et al. Inteligência artificial no posicionamento entre dente e nervo em radiografia panorâmica. Scientific Reports, v. 12, n. 1, p. 2456, 2022.
DEMIREL, O.; AKBULUT, A. Evaluation of the relationship between gonial angle and impacted mandibular third molar teeth. Anatomical Science International, v. 95, n. 1, p. 134–142, 2019. DOI: https://doi.org/10.1007/s12565-019-00507-0
DIAS-RIBEIRO, E. et al. Avaliação das posições de terceiros molares retidos em relação à classificação de Winter. v. 37, n. 3, p. 203–209, 2008.
FERREIRA JÚNIOR, O. S.; DAMANTE, J. H. Contribuição social do serviço de urgência odontológica da Faculdade de Odontologia de Bauru: sua participação no convênio com o Sistema Único de Saúde. Disponível em: https://repositorio.usp.br/item/001036248
. Acesso em: 30 set. 2025.
FRAGISKOS, F. D. Cirurgia oral. Springer Science & Business Media, 2007.
GONCA, M. et al. Evaluation of mandibular morphologic measurements and trabecular structure among subgroups of impacted mandibular third molars. Oral Radiology, v. 38, n. 1, p. 63–71, 2021. DOI: https://doi.org/10.1007/s11282-021-00527-5
GÜMRÜKÇÜ, Z.; BALABAN, E.; KARABAĞ, M. Is there a relationship between third-molar impaction types and the dimensional/angular measurement values of posterior mandible according to Pell & Gregory/Winter Classification? Oral Radiology, 2020. DOI: https://doi.org/10.1007/s11282-019-00420-2
JACQUES, E. et al. Radiographic evaluation of impacted third mandibular molar according to the classification of Winter, Pell and Gregory in a sample of Cameroonian population. Ethiopian Journal of Health Sciences, v. 33, n. 5, p. 851–858, 2023. DOI: https://doi.org/10.4314/ejhs.v33i5.15
KHOURI, C. et al. Evaluation of Third Molar Impaction Distribution and Patterns in a Sample of Lebanese Population. Journal of Maxillofacial and Oral Surgery, 2020. DOI: https://doi.org/10.1007/s12663-020-01415-x
KUMAR, V. R. et al. Prevalence and Pattern of Mandibular Third Molar Impaction in Eritrean Population: A Retrospective Study. The Journal of Contemporary Dental Practice, v. 18, n. 2, p. 100–106, 2017. DOI: https://doi.org/10.5005/jp-journals-10024-1998
LACERDA-SANTOS, J. T. et al. Signs of the proximity of third molar roots to the mandibular canal: an observational study in panoramic radiographs. General Dentistry, v. 68, n. 2, p. 30–35, 2020.
LISBOA, A. H. et al. Prevalência de inclinações e profundidade de terceiros molares inferiores, segundo as classificações de Winter e de Pell & Gregory. Pesquisa Brasileira em Odontopediatria e Clínica Integrada, v. 12, n. 4, p. 511–515, 2012. DOI: https://doi.org/10.4034/PBOCI.2012.124.10
MUBARAK, H.; TAJRIN, A. N.; NURWAIDA. Concordância da radiografia panorâmica com a tomografia computadorizada de feixe cônico na classificação de terceiros molares inferiores impactados: uma revisão sistemática. Arquivos de Cirurgia Craniofacial, v. 25, n. 6, p. 263–269, 2024.
NADAES, M. R. et al. Evaluation of the position of unerupted mandibular third molars with and without root dilacerations: a study on panoramic radiographs. Minerva Stomatologica, v. 65, n. 3, p. 152–157, 2016.
NUNES, W. J. P. et al. Reliability of panoramic radiography in predicting proximity of third molars to the mandibular canal: a comparison using cone-beam computed tomography. Imaging Science in Dentistry, v. 51, n. 1, p. 9–9, 2021. DOI: https://doi.org/10.5624/isd.20200095
KHOJASTEPOUR, L. et al. Does the Winter or Pell and Gregory Classification System Indicate the Apical Position of Impacted Mandibular Third Molars? Disponível em: https://pubmed.ncbi.nlm.nih.gov/31306615/
OLIVEIRA, D. V. de; MARTINS, V. B.; OLIVEIRA, M. V. de. Avaliação tomográfica de terceiros molares inclusos segundo classificação de Winter. Revista de Cirurgia e Traumatologia Buco-Maxilo-Facial, v. 16, n. 2, p. 17–23, 2016.
OLIVERA-BARROS, C. et al. Pell-Gregory, Winter, and Nolla classifications of third molars in patients at a university dental clinic. Revista Cubana de Medicina Militar, v. 53, n. 2, 2024.
ROOD, J. P.; SHEHAB, B. A. Predição radiológica de lesão do nervo alveolar inferior durante cirurgia de terceiro molar. British Journal of Oral and Maxillofacial Surgery, v. 28, p. 20–25, 1990. DOI: https://doi.org/10.1016/0266-4356(90)90005-6
SEDAGHATFAR, M.; AUGUST, M. A.; DODSON, T. B. Achados radiográficos panorâmicos como preditores de exposição do nervo alveolar inferior após extração do terceiro molar. Journal of Oral and Maxillofacial Surgery, [s.l.], [s.d.].
SIMONS, R. N. et al. Associação de indicações para coronectomia do terceiro molar mandibular e os sistemas de classificação de Pell e Gregory e Winter. Cirurgia Oral e Maxilofacial, v. 28, n. 2, p. 885–892, 2024.
SANTOS, K. K. et al. Prevalence of Mandibular Third Molars According to the Pell & Gregory and Winter Classifications. Journal of Maxillofacial and Oral Surgery, 2020. DOI: https://doi.org/10.1007/s12663-020-01473-1
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Copyright (c) 2025 Gabriel de Assis Bandeira Sousa, Iago Braga Negreiros, Caio César Silva França, Samnyo Martins Oliveira, Thiago Henrique Gonçalves Moreira, Matheus Araújo Brito Santos Lopes (Autor)

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