Assessment of Working Length of Root Canal in Mandibular First Primary Molar in Children Aged between 2 to 6 Years

Abstract

In the endodontic glossary the working length is defined as the distance from a coronal reference point to
the point at which canal preparation and obturation should terminate. Pulpectomy is a process of complete
removal of the necrotic pulp from the root canals of primary teeth and filling them with an inert resolvable
material so as to maintain the tooth in the dental arch. A University based study was conducted on mandibular
primary first molar. Various pathologies such as pain, swelling, abscess and resorption were considered.
Data collection was done by reviewing the patient records and analysing the data of 501 patients from June
2019 to March 2020, then excel tabulation, Statistical analysis was done using SPSS and Pearson chi-square
test was performed. The total number of patients seen were 501, age ranged from 2 to 6 years. Out of the
total population 42.91% (215) were female and 57.09% (286) were males. The mean length of mesio buccal
canal was 10.76 mm, mesio distal canal – 10.88 mm, and the distal canal was 11.2 mm in the mandibular
first primary molar. Pulpal pathology with mean working length of the root canals were as follows, In pain
the mesio buccal root had 10.76 mm, mesio lingual root had 10.81 mm and the distal root had 12.01 mm.
Abscess the mesio buccal root had 10.75 mm, mesio lingual root 10.79 mm and the distal root 12.03 mm.
Swelling the mesio buccal root had 10.75 mm, mesio lingual root had 10.80 mm, and the distal root had12
mm, Resorption mesio buccal root had 10.77 mm, mesio lingual root had 10.78 mm, and the distal root had
11.8 mm. In regard to various pathogens such as pain,swelling, abscess and resorption the working length
was determined as 10.76 mm for mesio buccal root, 10.88 mm for mesio lingual root and 11.2 mm for distal
root of the mandibular first primary molar.