Сross-sectional anatomic study of direct positional relationships between mandibular canal and roots of posterior teeth using cone beam computed tomography

Objectives: to establish the frequency of the various types of direct contacts of the root apices with the wall of the mandibular canal and to determine gender differences in number of such contacts in a selected belarusian population using cone beam computed tomography. methodology: one hundred and two cone beam computed tomography scans were analyzed to classify the types of contact and three-dimensional relationship between the mandibular teeth and the mandibular canal. results: the direct contact between the teeth and the mandibular canal was observed in 63.7 percent of patients. overall 300 roots of 189 teeth were in direct contact with the mandibular canal: 9.3 percent were second premolars, 14.7 percent were first molars, 33.8 percent were second molars and 50.0 percent were third molars. there were no statistically significant differences in the number of teeth with direct contact with the mandibular canal between males and females. conclusion: the direct contact of the root apices with the mandibular canal was most often found in the second and third molars. the root apices of the third molars had the greatest variability of location relatively to the mandibular canal.

Evaluation of root and canal morphology of mandibular premolars in urban Indian population: an in-vivo cone beam computed tomographic study.

Background: Inability to recognize anatomical variations in roots and canal configurations remains one of the principal factors in failure of endodontic therapy. Mandibular premolars, due to their varied internal morphology, present an endodontic challenge more often than other teeth. Objective: To assess the root morphology and canal configuration of mandibular first and second premolars using three-dimensional cone-beam computed tomography imaging (3D CBCT). Methodology: Bilaterally, mandibular premolars were evaluated on 100 CBCT images independently by two experienced endodontists. Vertucci’s classification was used to identify and divide the canal configurations. Results: 97% of first premolars and 99.5% of the second premolars were found to have one root. The most common canal configuration was found to be Type- I. Other types of canal configurations were 5.5% and 5% in first and second premolars respectively. Conclusions: Modern-day endodntist needs to be vigilant at all times to avoid missing canals and consequent failures.

Condições atípicas da anatomia de canais radiculares em pré-molares inferiores / Atypical situations in root canals anatomy of human mandibular premolars

O conhecimento da anatomia interna de dentes que terão seus condutos radiculares tratados endodônticamente é de fundamental importância para o sucesso do tratamento e do prognóstico desses dentes. Neste estudo, foram discutidas as variações morfológicas que podem ocorrer em relação ao número de canais radiculares presentes no grupo dental dos pré-molares inferiores, bem como os métodos mais eficazes de diagnosticar a presença dessas variações, a fim de ter um diagnóstico mais preciso quanto ao número de canais a serem tratados. Portanto, foi relatado um caso clínico de tratamento endodôntico de um pré-molar inferior com 4 condutos e demonstrados alguns casos de endodontia em pré-molares inferiores com 1, 2 e 3 condutos

The knowledge of the teeth internal anatomy that will receive endodontic treatment is very important for the success of the treatment and prognosis of those teeth. In this study, the morphological variations that may occur in relation to the number of root canals present in the premolar mandibular teeth group were discussed, as well as the most efficient methods to diagnose the existence of these variations, in order to have a clearer diagnosis of the number of root canals to be treated. A case of an endodontic treatment of a mandibular premolar with 4 root canals was reported and some cases of endodontic treatment in mandibular premolars with 1, 2 and 3 root canals were shown