Compressive Strength Of Resin Bridges Fabricated Using Different Methods

Objective: To compare the compressive load strength of resin bridges using different reinforcement materials and using different curing methods. Methods: A Standardized model with two class II cavities (prepared on two mounted teeth made from Duracast) and a space between them, were used. Z100 was used to manfacture bridges. There were 8 Groups. Group1: Resin LC (light cure) only, Group 2: Resin LC and PC (post-cure), Group 3: Resin and Stickbond LC, Group 4: Resin and Stickbond LC and PC. Group 5: Resin and 0.028 wire LC. Group 6: Resin and 0.028 wire LC and PC Group 7: Resin and fishline LC. Group 8: Resin and fishline LC and PC. An Instron measured the load, stress and the strain. Data was statistically analyzed using Student T and ANOVA tests. Results: Statistical significant results were obtained when the strain at maximum load was compared of sample groups 1 and 3 (p = 0.004) and groups 3 and 5 (p = 0.040). The strain at maximum load increased when the "resin-only" bridge was re-inforced with Stickbond and a further increase was seen when with 0.028 wire. The use of PC reduced the strength of 3 of the groups. In the "resin-only" group PC enhanced the strength. Conclusion: When a more flexible reinforcement material was used (for example the wire) the stress resistance to fracture was slightly increased more than with the more rigid reinforcement material, for example stickbond.