RESUMO
Objectives: this study aimed to compare the efficacy of panoramic radiography and the buccal object rule in intraoral periapical radiography for localization of impacted maxillary canine teeth
Methods: a total of 20 panoramic radiographs depicting 28 displaced maxillary canines were evaluated. The ratio of the mesiodistal width of the impacted canine to the mesiodistal width of the ipsilateral central incisor was calculated and referred to as the canine-incisor index [CII]. The height of the crown of each displaced canine was classified in vertical plane relative to the adjacent incisor as apical, middle or coronal. Position of impacted maxillary canines was also determined on two periapical radiographs using the buccal object rule. Surgical exposure and direct observation of impacted teeth were later performed and served as the gold standard. The data were analyzed using SPSS and t-test
Results: there was an overlap in the CII range of the buccally [0.78-1.48] and palatally [1.15-1.75] positioned impacted canines. When considering the height factor in the middle and coronal zones, a significant difference was noted between the CII of buccally [0.78-1.1] and palatally [1.15-1.75] positioned teeth enabling determination of their buccolingual orientation [P<0.05]
Conclusion: for the impacted maxillary canines located in the middle and coronal zones [90% of cases], the CII of 1.15 and higher represents palatal impaction while the CII smaller than 1.15 represents buccal impaction
RESUMO
Objective: Taurodontism is a dental anomaly characterized by elongation of root body and apical displacement of the pulp chamber floor associated with shortening of roots and their narrowing at the cementoenamel junction [CEJ]. Due to having a dilated apical one-third, these teeth may cause complications during extraction, locating canal orifices and instrumentation. This study aimed to assess the prevalence of taurodontism of permanent molars in a small Iranian population
Methods: This retrospective descriptive study was conducted on 1,100 dental records of patients that were randomly selected among 5,672 records available in the archives of School of Dentistry, Shahid Beheshti University of Medical Sciences from 2000 to 2010 that met the inclusion and exclusion criteria. Teeth with extensive restorations or carious lesions were excluded. One observer evaluated all the radiographs and the teeth were classified based on the presence or absence of taurodontism. All positive cases were re-evaluated by two examiners and accurate measurements were made using a caliper according to Shifman and Chanannel criteria
Results: A total of 1,184 radiographs were evaluated; of which 447 [47.7%] belonged to males and 737 [62.3%] belonged to females. A total of 5,532 first and second molars of both jaws were evaluated in these radiographs. There were 1,310 [23.7%] maxillary first molars, 987 [17.8%] mandibular first molars, 1,731 [31.3%] maxillary second molars and 1,504 [27.7%] mandibular second molars. Overall, 293 teeth had taurodontism; of which, 179 belonged to females and 114 belonged to males
Conclusion: The prevalence of taurodontism in the understudy population was 6.41%. It appears that taurodontism is not as rare as it is thought to be