Prevalence of Mandibular Third Molars According to the Pell & Gregory and Winter Classifications
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ORIGINAL ARTICLE
Prevalence of Mandibular Third Molars According to the Pell & Gregory and Winter Classifications Karina Kendelhy Santos1 • Frederico Santos Lages2 • Ce´sar Alexandre Barroso Maciel3 • Jose´ Cristiano Ramos Glo´ria1 • Dhelfeson Willya Douglas-de-Oliveira1
Received: 26 May 2020 / Accepted: 15 October 2020 The Association of Oral and Maxillofacial Surgeons of India 2020
Abstract Aim This study aimed to evaluate the prevalence of mandibular third molar positions according to the Pell & Gregory and Winter classifications, and to verify the association between the two classification methods. Material and Methods This cross-sectional study was conducted at dental imaging clinic, from January to March 2019. The inclusion criteria were third molars with complete rhizogenesis and the presence of the mandibular second molar. Patients under 16 years were excluded. Digital orthopantomography (panoramic radiography) radiographs of the mandibular third molars were analyzed and observed according to both Pell & Gregory and the Winter classifications, in addition to verifying if they were impacted. Data were submitted to chi-square test. Results and Statistics In total, 1087 teeth were analyzed, and 1055 teeth were included in the study. The teeth were most commonly found to be in the mesioangulated position (41.8%). Higher frequency was observed for position IIB (26.4%). The prevalence of impacted teeth was 79.6%. There was a statistically significant association between the Winter classification and Pell & Gregory classification (p \ 0.001).
& Dhelfeson Willya Douglas-de-Oliveira [email protected] 1
Department of Dentistry, Federal University of Jequitinhonha and Mucuri Valleys. Diamantina, Rua da Glo´ria, 187-CentroDiamantina/MG-CEP, Minas Gerais 39.100-000, Brazil
2
Faculty of Dentistry, Federal University of Minas Gerais. Belo Horizonte, Minas Gerais, Brazil
3
Private Practice. Diamantina, Minas Gerais, Brazil
Conclusion It was concluded that 79.6% of the mandibular third molars were impacted. The most frequent classification of teeth was position IIB, and the mesioangulated position. Keywords Pell & Gregory Prevalence Impacted teeth Third molar Orthopantomography
Introduction The mandibular third molars are the last to erupt and their anatomy and position in the mandible are most irregular [1, 2]. The time of third molar eruption varies among different individuals and may begin at 16 years of age, and extend up to the time they are 18–20 years old [3]. Generally, these are the teeth most affected by problems of impaction [4]. The impacted tooth is characterized by being completely or partially unerupted and positioned against another tooth, bone or soft tissue, so that it is unlikely to erupt at a later stage, and is described according to its anatomic position [5]. In the literature, these teeth are frequently described as being included or retained, this diversification of the nomenclature is due to the attempt of authors to provide more information about the situation of the unerup
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