| Summary: | 碩士 === 國立陽明大學 === 牙醫學系 === 102 === The root canal systems of anterior teeth in Asian population are quite different from Caucasian population. Clinically, when nonsurgical root canal treatment fails, surgical endodontic treatment is highly indicated. In the consequence of micro-computed tomography producing undistorted three-dimensional images without destroying the analyzing object, it would be helpful to understand the root canal morphology in clinical nonsurgical and surgical root canal treatment. The purpose of this study was to investigate the root canal morphology of extracted single-rooted anterior teeth using micro-computed tomography in a Taiwanese population.
Ninety-nine extracted single-rooted human anterior teeth were collected. All of the teeth were scanned by micro-computed tomography. The anatomy of each tooth, including length of the root, type of root canal system, number and location of canals, number and location of lateral canals, consistency and distance between apical center and apical foramen of main canal, diameter of apical foramen of main canal, diameter of apical foramen of lateral canal, and presence of apical delta were evaluated.
The apical center deviated from apical foramen of main canal frequently. The average deviation distance in upper anterior teeth was 0.8 mm. In lower anterior teeth, the mean distance was 0.6mm between apical center and apical foramen of main canal. Of the fifty upper anterior teeth studied, 56% teeth demonstrated lateral canals. Among the forty-nine lower anterior teeth, 28.6% teeth revealed lateral canals. Most of lateral canals were located frequently within the 3 mm region from the apical center. For upper anterior teeth, there were 79.17% of lateral canals situated within the 3 mm from the apical center. Moreover, 94.44% of lateral canals within the 2 mm from the apical center were found in lower anterior teeth.
The deviation distance between apical center and the apical foramen of main canal would be a great clinical reference for estimating working length during non-surgical root canal treatment. In surgical endodontics, the location of lateral canals could help endodontists to decide the length for root-end resection. For maxillary anterior teeth, the lateral canals were situated in a wide range between apical center and the bifurcated origin. While performing microscopic periapical surgery in maxillary anterior teeth, the length of apical root resection should be determined case by case. However, in those lower anterior teeth with short root length, resecting 2 mm of apical root would be able to remove 94.44% of lateral canals.
|
|---|
