Pulpectomy is one of the treatment options used to maintain primary teeth with radicular pulpal tissue inflammation or that have become nonvital, until normal exfoliation. The primary goal of this procedure is to maintain arch length and function by preserving primary teeth that are essential to proper guidance of the permanent dentition. Other objectives of preserving primary teeth are to enhance esthetics and mastication, prevent aberrant tongue habits, aid in speech, and prevent the psychological effects associated with tooth loss. The treatment consists of removing the pulp tissue associated with microorganisms and debris from the canal and obturating with resorbable filling material. Familiarity with the complexity of primary tooth canal systems, their formation and resorption pattern dictates the parameters that affect the probability of success of root canal therapy. Moreover, the obturating material as well as obturation technique used that is capable of densely filling the entire root canal system and providing a fluid tight seal from the apical segment of the canal to the cavosurface margin in order to prevent reinfection also significantly influences the success rate of the endodontic therapy. Several methods have been used to deliver obturating materials into the root canals. The purpose of this article is to throw light on various obturation techniques used in deciduous teeth with their comparison, pros and cons.

Background: The present study was undertaken to evaluate the accuracy of methods proposed by Tanaka and Johnston, Moyers, and Bernabé and Flores-Mir to forecast the mesiodistal dimensions of permanent canine and premolars in a North Indian population. Methods:Mesiodistal tooth dimensions were measured from study models representing 68 male and 68 female subjects (aged 12-16 years) of North Indian descent. The mesiodistal dimensions of the teeth were measured using a digital Vernier caliper (providing measurements to 0.01 mm accuracy). The measurements of canine and premolars were summed up and compared with those derived from Tanaka and Johnston equations, Moyers probability tables (75 th percentile), and Bernabé and Flores-Mir equations. Results:All the three methods exhibited overestimation of actual sum of permanent canine and premolars in both the arches and genders in this population. Because of the discrepancy observed, new regression analyses in the form of Y = A + B (X) were formulated similar to those proposed by Tanaka and Johnston originally, but separately for males and females. In males, the correlation coefficient between the sum of mesiodistal widths of mandibular incisors and the sum of widths of canine and premolars was 0.637 and 0.685 for maxilla and mandible, respectively. This value was 0.55 for maxilla and 0.64 for mandible in females. These values were found to be statistically significant. Conclusion: All the methods evaluated in the study were found to be inaccurate and they overestimate the mesiodistal widths of permanent canine and premolars in North Indian population. Revised linear regression equations were derived using the data obtained from this population. (Biomed J 2015;38:450-455)

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