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MINERVA STOMATOLOGICA

A Journal on Dentistry and Maxillofacial Surgery


Official Journal of the Italian Society of Odontostomatology and Maxillofacial Surgery
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Minerva Stomatologica 2011 July-August;60(7/8):359-64

language: English

Radiographical evaluation of bone quality after extraction of mandibular impacted and semi-impacted third molars

Alonso M. B. C. C. 1, Costa P. P. 2, Issa J. P. M. 3, Monteiro S. A. C. 3, Tiossi R. 4, Watanabe P. C. A. 3

1 Department of Oral Diagnosis and Dental Radiology, State University of Campinas, Campinas, São Paulo, Brazil;
2 Department of Morphology, Stomathology and Physiology, Ribeirão Preto School of Dentistry, University of São Paulo, Ribeirão Preto, São Paulo, Brazil;
3 Department of Bucco-Maxillo-Facial Surgery and Traumatology and Periodontology, Ribeirão Preto School of Dentistry, University of São Paulo, Ribeirão Preto, São Paulo, Brazil;
4 Department of Dental Materials and Prostheses, Ribeirão Preto School of Dentistry, University of São Paulo, Ribeirão Preto, São Paulo, Brazil


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AIM: The association between bone quality and fracture risk in the mandibular angle with the presence of impacted/semi-impacted third molars and after their extraction is controversial. This study aimed to assess mandibular bone quality in digital radiographies of patients after extraction of impacted/semi-impacted lower third molars.
METHODS: A total of 130 sets of digital panoramic radiographies were selected and divided into the following three groups: Group 1 with 50 panoramic radiographies of patients with impacted/semi-impacted lower third molars, Group 2 with 30 panoramic radiographies of patients with lower third molar agenesis, and Group 3 with 50 panoramic radiographies of patients after extraction of impacted/semi-impacted lower third molars. The mandibular angular cortex was the anatomical structure used as parameter for bone quality assessment. ANOVA and Student’s t test were applied for comparison between groups.
RESULTS:Mandibular angular cortical width was significantly lower when the third molar was present in both genders (P<0.05). Agenesis of the third molar in women was associated with lower thickness of the mandibular cortex when compared with patients who had their third molar extracted (P<0.05).
CONCLUSION:It can be concluded that the absence of impacted/semi-impacted lower third molars, was associated with a significant increase in cortical width.

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watanabe@forp.usp.br