Factors associated with pulp canal obliteration due to traumatic injuries in deciduous teeth: a retrospective study

Pulp canal obliteration (PCO) presents itself as a frequent pulp complication in traumatized primary teeth, characterized as a progressive deposition of hard tissue in the root canal. In this context, this study aimed to evaluate the association between PCO due to the occurrence of traumatic dental injuries (TDI) in deciduous teeth and specific factors. For this, a retrospective study was carried out through 210 medical records selected from the Dental Trauma Care Program from 2012 to 2019. After applying the eligibility criteria, 371 deciduous teeth were included. Statistical analysis was performed using chi-square and Fischer's exact test. The occurrence of PCO was observed in 4.9%. Associated factors such as age (P=0.63), sex (P=0.47) and search for care (P=0.87) did not influence the occurrence of PCO. Concerning the type of TDI and development of PCO, the injury of subluxation showed a statistically significant association (P=0.01). There was an association of PCO with other TDI complications such as crown discoloration (P<0.01) and acceleration of physiological root resorption (P=0.01). No statistically significant association was found regarding the development of sequelae in permanent successors and PCO (P>0.05). Based on this study, PCO was not a frequent complication of TDI in deciduous teeth in the population evaluated. PCO was associated with subluxation, crown discoloration, and acceleration of physiological root resorption. However, it did not show association with any related factor (age, sex, and seeking care) and the development of clinical or radio graphical sequelae in permanent successors.