ABSTRACT
OBJECTIVES: To evaluate the marginal integrity (MI%) and to characterize specific properties of a thermoviscous bulk-fill resin composite, two regular bulk-fill resin composites, and a non-bulk-fill resin composite. MATERIALS AND METHODS: VisCalor bulk (VBF), Filtek One Bulk Fill (OBF), and Aura Bulk Fill (ABF) were evaluated. Filtek Z250 XT (ZXT) was used as non-bulk-fill control. MI% was evaluated in standardized cylindrical cavities restored with the composites by using a 3D laser confocal microscope. The following properties were characterized: volumetric polymerization shrinkage (VS%), polymerization shrinkage stress (Pss), degree of conversion (DC%), microhardness (KHN), flexural strength (FS), and elastic modulus (EM). Data were analyzed by one-way and two-way ANOVA, and Tukey HSD post-hoc test (α = 0.05). RESULTS: VBF presented the highest MI% and the lowest VS% and Pss (p < 0.05). DC% ranged from 59.4% (OBF) to 71.0% (ZXT). ZXT and VBF presented similar and highest KHN than OBF and ABF (p < 0.05). ABF presented the lowest FS (p < 0.05). EM ranged from 5.5 GPa to 7.7 GPa, with the values of ZXT and VBF being similar and statistically higher than those of OBF and ABF (p < 0.05). CONCLUSIONS: Thermoviscous technology employed by VisCalor bulk was able to improve its mechanical behavior comparatively to regular bulk-fill resin composites and to contribute to a better marginal integrity in restorations built up in cylindrical cavities with similar geometry to a class I cavity as well. Although presenting overall better physicomechanical properties, Z250 XT presented the worst MI%. CLINICAL RELEVANCE: The marginal integrity, which is pivotal for the success of resin composite restorations, could be improved using VisCalor bulk-fill. The worst MI% presented by Z250 XT reinforces that non-bulk-fill resin composites shall not be bulk-inserted in the cavity to be restored.
Subject(s)
Composite Resins , Dental Marginal Adaptation , Elastic Modulus , Flexural Strength , Materials Testing , Polymerization , Surface Properties , Composite Resins/chemistry , Hardness , Microscopy, Confocal , In Vitro Techniques , Dental Restoration, Permanent/methods , Dental Stress AnalysisABSTRACT
Dentes supranumerários são achados frequentes, podendo encontrar-se inclusos nas arcadas. As radiografias convencionais são utilizadas para o diagnóstico e permitem a visualização da posição dentária e a relação com estruturas vizinhas. Entretanto, essas modalidades de imagem apresentam limitações que podem comprometer o diagnóstico e o tratamento. O uso da imagem tridimensional obtida pela Tomografia Computadorizada de Feixe Cônico (TCFC) supera muitas dessas desvantagens, tornando essa técnica superior às convencionais, em casos envolvendo dentes inclusos e/ou impactados. O objetivo deste trabalho é apresentar uma revisão de literatura destacando às vantagens da TCFC em relação às imagens bidimensionais no diagnóstico de hiperdontia.
Supernumerary teeth are common findings, can be found included in the arcades. Conventional radiographs are used for the diagnosis and allow visualization of dental position and the relationship with surrounding structures. However, these imaging modalities have limitations which could compromise the diagnosis and treatment. The use of three-dimensional image obtained by Cone Beam Computed Tomography (CBCT) overcomes many of these disadvantages, making this technique superior than conventional, in cases involving teeth included and / or impacted. The objective of this study is to present a literature review with emphasis on the advantages of CBCT compared to two-dimensional images in diagnosis of hyperdontia.