Comparison of Analog Panoramic Radiography and Cone Beam Computed Tomography for Assessing Relationship between Impacted Mandibular Third Molar and Inferior Alveolar Nerve Canal

سال انتشار: 1398
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 254

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شناسه ملی سند علمی:

SRMMED22_356

تاریخ نمایه سازی: 19 آبان 1398

چکیده مقاله:

Background and Objective: impacted mandibular third molar(IMTM) is the most frequently impacted teeth. Impairment of sensation is one of the postoperative complications caused damage to the inferior alveolar nerve(IAN). Two type of radiographs which help us to prevent the nerve s injury are panoramic and Dental cone beam computed tomographic(CBCT). The aim of this study is to compare panoramic radiographs and CBCT for assessing relationship between IMTM and IAN. Method of Evaluation : 60patients in the age range of 18–30 years were included in this study. A trained radiologist evaluated the panoramic radiographs and CBCTs, the relationship between IAN and IMTM was assessed using the Shehab&Rood classification and the nerve proximity to the thirdmolar was determined using CBCT. The data were analyzed using SPSS16. The findings in the panoramic radiographs and CBCT were compared using chi-square, Fisher s exact test and P-value<0.05 was considered. Kappa values were used to assess the intra-observer reliability. Findings: 33 teeth showed contact between tooth and nerve. The highest sensitivity of panoramic radiography was related to darkening of root (48.6percent), the lowest sensitivity related to narrowing of the canal (5.7percent) and diversion of the canal (5.7percent) The highest specificity related to the deflection of the root (100percent) and interruption of the white line (96percent), the lowest specificity related to deflection of the root (64percent) and narrowing the canal (64percent). The kappa values for inter-examiner reliability within two-weeks were 0.651(panoramic radiographs) and 0.925(CBCT) respectively. Conclusion:58 percent of cases indicate direct contact between the molar and the nerve. In diversion of the canal, interruption of the radiopaque border of canal, darkening of the roots, the possibility of this contact is considerably high. The relationship between diversion of the canal and interruption of the radiopaque border of canal has a high predictive value for indicating the absence of this contact.

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نویسندگان

Amirhossein Moaddabi

Associated Professor, Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Mazandaran University of Medical Sciences, Sari, Iran

Mehran Ebrahimzadeh Hassanabadi

Dental Student, Faculty of Dentistry, Student Research Committee, Mazandaran University of Medical Sciences, Sari, Iran