Revista de Odontologia da UNESP
http://revodontolunesp.com.br/article/doi/10.1590/1807-2577.09117
Revista de Odontologia da UNESP
Original Article

External root resorption of second molars caused by impacted third molars: an observational study in panoramic radiographs

Reabsorção radicular externa de segundos molares ocasionadas por terceiros molares impactados: estudo observacional em radiografias panorâmicas

Jhonatan Thiago LACERDA-SANTOS; Gélica Lima GRANJA; Jalber Almeida dos SANTOS; Julliana Cariry PALHANO-DIAS; José Cadmo Wanderley Peregrino de ARAÚJO-FILHO; Eduardo DIAS-RIBEIRO

Abstract

Objective: This research investigate the presence of external root resorption (ERR) in second molars caused by impacted third molars in panoramic radiographs, relating to the position of third molars according to classification of Winter, Pell and Gregory.

Material and method: A cross-sectional, retrospective study using panoramic radiographs obtained from January 2014 to December 2015. The inclusion criterion was the presence of a second molar adjacent to an impacted third molar. Data were analyzed using descriptive and inferential statistics. Pearson's Chi-Square Test and Fisher's Exact Test (p≤0.05) were performed.

Result: The sample consisted of 584 panoramic radiographs, 356 (60.95%) of women, and 228 (39.05%) of men, the mean age was 25.31 years. The prevalence of ERR was 12.5%, and the group of 14-24 year olds was the most affected (p = 0.46). The presence of ERR was statistically higher in the mandible (42.1%) with p=0.01. The ERR located in the cervical (57.1%) and medium (58.8%) thirds was proportionally higher in the teeth with B2 (p=0.02) and mesio-angular positions (p=0.26).

Conclusion: The prevalence of ERR in second molars, caused by impacted third molars, was shown to be similar to results found in the literature, with no gender preference, this affects young patients, occurring frequently in mandible teeth, and presents greater severity in the cervical and middle thirds. The B2 and mesio-angular positions were more prone to ERR.

Keywords

Impacted tooth, third molar, panoramic radiography, reabsorption

Resumo

Objetivo: Esta pesquisa investigou a presença de reabsorção radicular externa (RRE) em segundos molares ocasionada pelos terceiros molares impactados em radiografias panorâmicas, relacionando com a posição dos terceiros de acordo com a classificação de Winter e de Pell e Gregory.

Material e método: Um estudo transversal, retrospectivo, por meio de radiografias panorâmicas obtidas no período de janeiro de 2014 a dezembro de 2015. Adotou-se como critério de inclusão, a presença um segundo molar adjacente a um terceiro molar impactado. Os dados foram analisados por meio de estatística descritiva e inferencial. Foram realizados o Teste Qui-Quadrado de Pearson e Teste Exato de Fisher (p≤0,05).

Resultado: A amostra foi composta por 584 radiografias panorâmicas, sendo 356 (60,95%) do gênero feminino e 228 (39,05%) do masculino, a média de idade foi de 25,31 anos. A prevalência de RRE foi de 12,5%, e a faixa etária de 14-24 anos foi mais acometida (p=0,46). A presença de RRE foi estatisticamente maior na mandíbula (42,1%) com p=0,01. As RRE localizadas nos terços cervical (57,1%) e médio (58,8%) foram proporcionalmente maiores nos dentes nas posições B2 (p=0,02), e mesioangular (p=0,26).

Conclusão: A prevalência de RRE em segundos molares causada por terceiros impactados se mostrou estar de acordo com a média existente na literatura mundial, sem predileção por gênero, acometendo mais pacientes jovens, frequentemente ocorre nos dentes da mandíbula e apresenta um maior grau de severidade no terço cervical e médio. As posições B2 e mesioangular apresentaram maior propensão à RRE.
 

Palavras-chave

Dente impactado, terceiro molar, radiografia panorâmica, reabsorção

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