Tensile bond strength of intracanal posts in primary anterior teeth: an in vitro study

The aim of this study was to measure in vitro; the tensile bond strength of three intracanal posts used in anterior primary teeth. A total of 45 single rooted primary anterior teeth were selected for the study and the crowns sectioned leaving 1mm above the cement-enamel junction. The roots were then assigned to three groups according the type of retention used. All roots were endodon-ticaly treated, a 4-mm of the canal was cleansed and a base of glass ionomer cement was put at the bottom of the prepared canal. The roots were then prepared to receive intracanal posts using a # 4137 diamond bur (KG Sorensen) used in a depth of 3-mm of the length of the canal. All the prepared roots were acid etched with a 37% phosphoric acid gel for 15 seconds, rinsed, dried and the dentin adhesive Single Bond (3M) was applied. Group I received intracanal posts and cores made of composite resin (Filtek Z 250, 3M). Group II intracanal posts were made from a 0.6mm orthodontic wire bent as a Greek letter type (gamma), fixed with the Z 250 composite resin and cores were built with the same composite. Finally Group III received intracanal retention made of a fiber glass post (Fibrekor Post, Generic/Pentron) with 1.25mm diameter, fixed with Z 250 and cores were made like the other groups. The samples were submitted to tension in a univer-sal-testing machine (Instron, model 4444). Statistical analysis (ANOVA) reveled that there were no statistically significant differences between the groups. On the basis of the results of this in vitro study it was concluded that the type of intracanal post did not interfere with the tensile strength and the most frequent type of failure was of adhesive type, corresponding to 74% of the sample.

1. Perrela A, Sagretti OMA, Guedes-Pinto AC. Estudo compara-tivo de técnica de retenção intracanal para reconstrução de dentes decíduos anteriores. Rev Bras Odontol 52: 42-45, 1995.

2. Imparato JCP, Bonecker MJS, Duarte DA, Guedes-Pintp AC. Restauração de dentes decíduos anteriores: técnica alternativa de colagem de coroas naturais. J Bras Odontoped Odonto Bebe 1: 63-72, 1998.

3. Ghersel ELA, Imparato JCP, Aratani M, Mendes M. Restau-rações de dentes decíduos anteriores: técnicas alternativas de coroas de resina composta e pinos biológicos. J Bras Odontoped Odonto bebe 1: 13-22, 1998.

4. Wanderley MTR, Ferreira SLM, Rodrigues CRMD, Rodrigues Filho LE. Primary anterior tooth restoration using posts with macroretentive elements. Quintessence Int 30: 432-436, 1999.

5. Bengtson AL, Bengtson NG. Coroas de aço- Odontopediatria. Ver Assoc Paul Cir Dent 223-225,

6. Snawder KD, Gonzalez Jr W. Management of severely diseased primary anterior teeth. J Dent Child 42: 181-185, 1975.

7. Brossok GE, Cullen CL. Nursing caries syndrome: restorative options for primary anterior teeth. Compend Contin Educ Dent 9: 495-504, 1988.

8. Weinberger SJ. Treatment modalities for primary incisors. J Can Dent Assoc 55: 807-812, 1989.

9. Judd PL, Kenny DJ, Johnston DH. Composite resin short-post technique for primary anterior teeth. J Am Dent Assoc 120: 553-555, 1990.

10. Romano AR, Imparato JCP. Opção para reabilitação de dente decíduo anterior superior. Rev Fac Odonto UF Pel-RS 4: 25, 1994.

11. Ramires-Romito ACD, Wanderley MT, Oliveira MDM, Imparato JCP. Biologic restoration of primary anterior teeth. Quintessence Int 31: 405- 411, 2000.

12. Drummond BK. Restoration of primary anterior teeth with com-posite crowns. N Zel Dent J 89: 92-95, 1993.

13. Kaste LM, Marianos D, Chang R, Phipps HR. The assessment of nursing caries and its relationship to high caries in the permanent dentition. J Public Health Dent 52: 64-68, 1992.

14. Rifkin AJ. Composite post-crowns in anterior primary teeth. J Dent Assoc S Afr 38: 225-227, 1983.

15. Mendes S, Portella W, Gleiser R. Técnica do pino curto de resina para restaurações de dentes decíduos anteriores- Relato de caso. Rev Odontop 2: 75-81, 1993.

16. Damasceno AP, Rocha C, Lima JB, Alves P. Retenção de reten-tores intra-radiculares cimentados com Panavia 21, em canais obturados com cimentos com e sem eugenol. Pesq Odontol Bras 14 (Spec Iss): 49, 2000.