Does Endodontic Re-Treatment in Primary Teeth Increase the Functional Tooth Retention? A Clinical, Retrospective, University-Based Study

Bruna Soares da Silva, Gabriel Ferreira Nicoloso, Luciana Fantinel Ruiz, Tiago André Fontoura de Melo, Luciano Casagrande


Objective: To investigate the longevity of endodontic treatments and the survival of endodontic re-treatments performed in primary teeth. Material and Methods: The sample included endodontic treatments and re-treatments conducted in anterior and posterior primary teeth without sedation or general anesthesia among children attending a university dental service. Information collected retrospectively from clinical records was used for analyzing data. The Kaplan-Meier estimator test was used to analyze the longevity and survival of endodontic treatment and re-treatments, respectively. Results: A total of 73 patients with endodontic therapy in primary teeth were included in the study, and 116 teeth were analyzed. After one year, the longevity of endodontic treatments performed on primary teeth was 65.74% with an annual failure rate (AFR) of 34.2%. From 47 endodontic treatment failures, 14 teeth (29.8%) were endodontically re-treated. When the endodontic re-treatment was considered as survival, the longevity of treatments reached 68.06% with 31.9% of AFR after one year of follow-up. There was a significant increase in functional tooth retention in those patients that received an endodontic re-treatment (p<0.001). Retreatment provided an additional mean survival time of 8.3 months. Conclusion: Endodontic treatments performed in primary teeth presented a limited longevity. Endodontic re-treatment is a more conservative alternative for endodontically treated primary teeth that have failed and significantly increase tooth retention.


Tooth, Deciduous; Root Canal Obturation; Pulpectomy.

Full Text:



Souza PM, Duarte RC, Sousa SA. Clinical and radiographic monitoring of primary teeth submitted pulp therapy with CTZ paste. Pesqui Bras Odontopediatria Clin Integr 2014; 14(Supl 3):56-68.

Brustolin JP, Mariath AA, Ardenghi TM, Casagrande L. Survival and factors associated with failure of pulpectomies performed in primary teeth by dental students. Braz Dent J 2016; 28(1):121-8.

Piovesan C, Guedes RS, Casagrande L, Ardenghi TM. Socioeconomic and clinical factors associated with traumatic dental injuries in Brazilian preschool children. Braz Oral Res 2012; 26(4):464-70.

American Academy of Pediatric Dentistry. Guideline on pulp therapy for primary and immature permanent teeth. Pediatr Dent 2016; 38(6):280-8.

Bergoli AD, Primosch RE, de Araujo FB, Ardenghi TM, Casagrande L. Pulp therapy in primary teeth - Profile of teaching in Brazilian dental schools. J Clin Pediatr Dent 2010; 35(2):191-6.

Pramila R, Muthu MS, Deepa G, Farzan JM, Rodrigues SJ. Pulpectomies in primary mandibular molars: A comparison of outcomes using three root filling materials. Int Endod J 2016; 49(5):413-21.

Keinan D, Moshonov J, Smidt A. Is endodontic re-treatment mandatory for every relatively old temporary restoration? A narrative review. J Am Dent Assoc 2011; 142(4):391-6.

Correa MB, Peres MA, Peres KG, Horta BL, Barros AJ, Demarco FF. Do socioeconomic determinants affect the quality of posterior dental restorations? A multilevel approach. J Dent 2013; 41(11):960-7.

Bücher K, Metz I, Pitchika V, Hickel R, Kühnisch J. Survival characteristics of composite restorations in primary teeth. Clin Oral Investig 2015; 19(7):1653-62.

Barcelos R, Tannure PN, Gleiser R, Luiz RR, Primo LG. The influence of smear layer removal on primary tooth pulpectomy outcome: A 24-month, double-blind, randomized and controlled clinical trial evaluation. Int J Pediatr Dent 2012; 22(1):369-81.

Peters LB, Van Winkelhoff AJ, Buijs JF, Wesselink PR. Effects of instrumentation, irrigation and dressing with calcium hydroxide on infection in pulpless teeth with periapical bone lesions. Int Endod J 2002; 35(1):13-21.