Effect of Dental Posts used in Restoring Badly Broken Primary teeth

Abstract

Aim: The aim of this study was to evaluate the shear bond strength (SBS) and fracture resistance (FR) of endodontically treated primary anterior teeth restored: with composite resin reinforced with three different post systems. (1) Ribbon fiber posts; (2) glass fiber posts; and, (3) orthodontic metal wire posts cemented by glass ionomer cement (GIC).Methods: This experimental study conducted in a controlled laboratory setting was performed on 60 extracted human primary maxillary incisors. Samples were randomly divided into 3 groups of 20 teeth each: group 1 (ribbon fiber posts and composite core); group 2 (glass fiber posts and composite core) and group3 (orthodontic metal shaped wire posts and composite core). Each main test group subdivided into two subgroups (I, II) of 10 teeth each according to the laboratory test used, shear bond and fracture strength respectively. Mounted specimens were subjected to an Instron testing machine.Results: For shear bond strength, Stainless steel group recorded the highest mean value (14.4±2.4Mpa) followed by Glass fiber group (5.6±4.01Mpa) while ribbon fiber group recorded the lowest mean value (4.9±2.8Mpa). The difference between all groups was statistically significant (p<0.05) as indicated by ANOVA test. For fracture resistance, Glass fiber group recorded the highest mean value (146.018±37.96N) followed by ribbon fiber group (133.3±38.222N), while Stainless steel group recorded the lowest mean value (111.48±30.522N). The difference between all groups was statistically significant (p<0.05) as indicated by ANOVA test.Conclusion: orthodontic metal wire posts and glass fiber posts proved their advantages regarding the shear bond& fracture resistance respectively.