Authors: Pineda F, Kuttler Y.
Title: Mesiodistal and buccolingual roentgenographic investigation of 7,275 root canals.
Journal: Oral Surg Oral Med Oral Pathol
Date: Jan 1972
Citation: 33(1):101-10
Category: Anatomical Considerations
Evidence-based Ranking: 5
Purpose/Objective: To determine the normal root canal anatomy and its variations and percentages using M-D and B-L radiographic views.

Materials and methods: 4183 extracted teeth were used as samples yielding an average of 261 teeth of each type. The teeth were classified in 3 groups: 1st group teeth of = up to 25 years of age, 2nd group = 35-45 years, 3rd group = >55years. The teeth were radiographed in 2 directions. The various configuration of roots and root canals were recorded.

Results: 1. When a root canal on the mesiodistal plane shows a sudden and very marked narrowing or disappears, it means that at this point on the buccolingual plane the root canal divides into 2 parts. 2. There is a reduction in diameter of the root canals in older age groups. The deviation and diameter of the foramina increased as well. 3. Only 3.1% of the canals were straight in both MD and BL directions. Most are maxillary central incisors. 4. Curvatures are most frequent in the apical third. 5. 30.6% of the teeth had ramifications of the main root canal.

Validity of Conclusions: The results are valid.

ReviewerÂ’s comments: The samples had 2 gaps (26-34 years and 46-54). It is a good comprehensive study that adds substantial information about the anatomy of teeth.