USE OF PROPHY-JET ON RESIN RESTORES: EXPERIMENTAL EVALUATION ON MICROHYBRID AND NANO-FILLED COMPOSITES

Objects: analyze the effects of prophy-jet on microhybrid and nano-filled composites to determine the degree of roughness wich the resins are subjected and consequently discover wich of the two composites will be the best under the influence of prophy-jet. Materials And Methods: 108 teeth prepared with bovine cervical cavity through cylindrical cutter. The teeth are divided into two groups according to the resin used (Filtek Z250 microhybrid A, B nano-filled Supreme XT) of 54 elements each. The samples thus prepared are cured for 30 sec and before exposing them to the jet of the Prophy-jet (the teeth are positioned at a distance of 5 mm from the handpiece to be operated in a circular motion) are polished with either diamond burs (10''ring 10''yellow then red ring under irrigation) than with discs 3M Soft lex (four types of wheat from the thickest to thinnest) operated without irrigation and 10''disc. A polishing finished each group was divided, according to the type of powder used in two groups: α (powder of glycine) and β (aluminum trioxide) which are further divided into three subgroups of 9 teeth each, according to the time of exposure to jet (5'', 10''and 15''). The samples after being exposed to the jet are analyzed using roughness and subjected to statistical analysis. Results: A: α5'': 2.57''α10: 1.66 α15'': 2.19; β5'': 2.11''β10: 1.91 β15'': 1.17, mean values: α 2.10, β 1.70, mean A: 1.90, P = 0.0737. B: α5'': 3.26''α10: 2.86 α15'': 2.27; β5'': 2.37''β10: 1.95 β15'': 2,2; average values: α 2.80, β 2.20, mean B: 2.50, P = 0.0011. Discussions: In group A, α and β are not statistically significant (p = 0.0737) and in group B, p = 0.0011 and statistically significant, α ≠ β and the average of all α is greater than β, with the composite B, β (aluminum trioxide), is better than α. A and B are very different, but being the statistical average of A less than B the roughness of A is <B. Dealing with glycine A and B, A is better; trioxide dealing with A and B, A is better. In Guppi A β15 is among the best, α5 among the worst. In group B β10 is the best, α5 is the worst. Conclusions: With the statistical analysis reveals that a 5'', especially with glycine, it has greater roughness than 10''and 15''. It would appear therefore to sense the polishing power of the Prophy-jet, capable of polishing the composite without damaging it, up to a maximum, in our protocol, 15''. Thus analyzed the effects in the two groups of composites, one can say that, in this study, A (micro-hybrid) is better than B (nano-filled).