2ndIASCBCDr.Htarfinal.doc - 2nd IASCBC 36th AAT Annual...

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2 nd IASCBC & 36 th AAT Annual Conference Proceedings of the Anatomy Association of Thailand December 6-8, 2012 Morphometric Analysis of the Mandibular Canal and Mental Foramen Using OPG and 3D CBCT: A Comparative Study Htar Htar Aung 1* , Nazih Shaaban Mustafa 2 1 Department of Basic Medical Science, Faculty of Dentistry, International Islamic University Malaysia, Jalan Sultan Ahmad Shah Bander Indera Mahkota, 25200 Kuantan, Pahang Darul Makmur, Malaysia 2 Department of Oral Surgery, Faculty of Dentistry, International Islamic University Malaysia, Jalan Sultan Ahmad Shah Bander Indera Mahkota, 25200 Kuantan, Pahang Darul Makmur, Malaysia *Corresponding author, e-mail: [email protected] Abstract Background A preoperative evaluation of the true relationship between the roots of the mandibular third molar and the inferior alveolar nerve, mental foramen and lower premolars would help in avoiding sensory impairment during surgical procedures. Objectives To determine the differences of the level of mandibular canal and mental foramen by using orthopantomographs (OPG) and cone beam computed tomography (CT). Materials and Methods Total 28 OPG and CT of same patients (Malaysian) were selected. Results The mean vertical diameter of mandibular canal, proximal to the third molar tooth, was 2.5 mm with OPG and 2.7-2.8 mm with CT. The mean distance between upper border of mandibular canal and apices of lower third molar (0.4-0.8 mm) was lesser in OPG compared to that of CT (0.7–1.3 mm). The mean horizontal diameter of mental foramen was 2.4-2.6 mm with OPG and 2.6-2.7 mm with CT. The mean vertical diameter was 2.4-2.5 mm in OPG and 2.5-2.7 mm in CT. The mean distance between mental foramen and apex of the premolars was 1.4-2 mm and 3.1-3.7 mm with OPG and CT respectively. This difference was statistically significant on both sides (p<0.05). Conclusion The measurement with CT is higher and more accurate in comparing with the findings of OPG. Keyword Mandibular canal, mental foramen, orthopantomographs, cone beam computed tomography 1
2 nd IASCBC & 36 th AAT Annual Conference Proceedings of the Anatomy Association of Thailand December 6-8, 2012 Background The mandibular canal is a canal within the mandible that is beginning in mandibular foramen on the medial surface of the ascending mandibular ramus. It runs obliquely downward and forward in the ramus, and then horizontally forward in the body till mental foramen. It carries inferior alveolar neurovascular bundle (1). Generally, the mental foramen is difficult to locate due to lack of consistent anatomic landmarks for reference and the foramen cannot be clinically visualized or palpated (2). As a result, variable anatomical positions of the foramen have been described. Most studies and textbooks describe the location of the mental foramen as below and between the apices of the first and second premolar (3-5) or as being below the apex of the second premolar (6-11). Malamed (12) reported that both locations are common. However, According to

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