Effect of Preheating on Surface Microhardness of Six Composite Resins
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Background: Preheating resins has been shown to improve physical properties such as surface microhardness. Some low-cost composite resins have not been well studied and preheating could improve their properties. Objective: to evaluate if preheating increases the surface microhardness of 6 composite resins and if the microhardness of the preheated low-cost ones equals that of the other resins Method: In this In vitro experimental investigation, 6 resins were used, EnaHri®UE2 and UD2 (Micerium, Genoa Italy) as control, Z350TM and Z250TM (3M ESPE, Minnesota United States) conventionally used composites and LUNA ® and ROK ® (SDI, Victoria Australia) as low-cost resins. Specimens without preheating (sp) and preheating at 39°C (p) were created for each resin. It was polymerized according to the manufacturers' instructions. Three measurements were made per sample using a microhardness tester applying a 300 g load for 10 seconds. Results: Resin-enamel microhardness: LUNA ® sp 69.93 HV (95 % CI 62.02-77.85), Z350TM sp 89.9 HV (95 % CI 80.56-99.23), LUNA ® p 70.05 HV (95 % CI 62.97-77.12), Z350TM p 87.47 HV (CI 95 % 78.71-96.23). The microhardness of resins-dentin: ROK ® sp 85.16 HV (95 % CI 69.91-100.4), Z250TM sp 95.99 HV (95 % CI 74.8-117.2), ROK ® p 92.19 HV (95 % CI 80.83-103.6), Z250TM p 104.7 HV (95 % CI 97.76-111.6). Preheating did not significantly increase microhardness except for control resins. ROK ® sp is equivalent to Z250TM sp (p 0.2825). Conclusion: Preheating does not increase the surface microhardness of the composite resins analyzed. The microhardness of ROK ® sp resin is equivalent to Z350TM sp.
resina precalentada, microdureza Vickers, prueba de dureza, dureza superficial, resina compuesta, materiales dentales, microdureza superficial, odontologíacomposite resin, dental materials, hardness test, preheated resin, surface hardness, surface microhardness, dentistryodontologia, dureza superficial, materiais dentários, microdureza superficial, microdureza Vickers, resina composta, resina pré-aquecida, teste de dureza
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