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VOLUME 19 , ISSUE 5 ( 2018 ) > List of Articles


Effect of using the New Glass Fiber Pin in Resin Composite Restorations

Clóvis L de Moraes Melo Neto, Guilherme T Costa, Tarso Lorga, Gabriela C Santin, José Mondelli, Sérgio Sábio

Keywords : Glass fiber pins, Laboratory research, Metal pin

Citation Information : Neto CL, Costa GT, Lorga T, Santin GC, Mondelli J, Sábio S. Effect of using the New Glass Fiber Pin in Resin Composite Restorations. J Contemp Dent Pract 2018; 19 (5):541-545.

DOI: 10.5005/jp-journals-10024-2296

License: CC BY-NC 3.0

Published Online: 01-06-2018

Copyright Statement:  Copyright © 2018; The Author(s).


Aim: The purpose was to compare the fracture strength between restorations containing the metal pin (MP) and those containing the glass fiber pin (GFP). Materials and methods: Forty-five healthy bovine anterior teeth were used in this study. A preparation of 4 mm x 4 mm was created on the incisal surface of each tooth. All teeth were prepared in the same way. The teeth were randomly divided into three groups (n = 15): group I—control: teeth restored with resin composite (RC) only, without reinforcement; group II—Each tooth was restored with a MP and RC; group III—Each tooth was restored with a GFP and RC. The specimens were left in an oven at a temperature of 37°C for 24 hours before performing the fracture strength tests. The fracture strength test was performed in a universal test machine at an angle of 90°. Results: The Tukey test (p ≤ 0.05) showed that for the variable maximum force (kgf), there was no statistically significant difference among the groups (p = 0.272). The chi-square test showed that groups II and III presented over 70% of cohesiveadhesive type fractures when compared with group I (over 70% of adhesive fractures), and this difference was statistically significant (p < 0.05). Conclusion: The pins tested did not increase the fracture resistance of the restorations (RC) in comparison with group I (without reinforcement); however, with the use of the MP and GFP, there was a predominance of cohesive-adhesive fractures (groups II and III). Clinical significance: Evaluate if the new GFP can generate greater resistance to fracture of RC restorations.

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