ABSTRACT
OBJECTIVES: This in vitro comparative study aimed to evaluate the physical and mechanical properties of four 3D-printed resins with two different thickness layers. METHODS: Four printed resins (VarseoSmile Crown Plus, VSC; NexDent C&B MFH, MFH; Nanolab 3D, NNL; and Resilab 3D Temp, RSL) were printed with 50 µm and 100 µm layer thickness, resulting in 80 bars measuring 25 × 2×2 mm. The specimens underwent a Raman spectroscopy for degree of conversion, confocal laser scanning microscopy for surface roughness (Sa), three-point bending test for flexural strength and elastic modulus, and a Vickers hardness test (VHN). Data was tested for normality using the Shapiro-Wilk, two-way ANOVA, and Tukey test (α = 0.05) for statistical analysis. RESULTS: The layer thickness affected all performed tests, but the elastic modulus (p < 0.001). Specimens with 100 µm showed, in general, worse results outcomes than those with 50 µm (p < 0.001). However, within the limitations of this comparative in vitro study, it could be concluded that the tested resins and layer thicknesses directly influenced physical and mechanical properties. SIGNIFICANCE: The physical and mechanical properties of three-dimensional printed restorations can be affected by the layer thickness, which can interfere with the choice of the 3D printing resin for a desired clinical outcome.
Subject(s)
Composite Resins , Dental Materials , Dental Materials/chemistry , Materials Testing , Flexural Strength , Printing, Three-Dimensional , Surface PropertiesABSTRACT
Introdução: Acidentes esportivos relacionados à traumatismo dento-alveolar possuem alta prevalência entre crianças e o tratamento depende da extensão da fratura, das condições periodontais e endodônticas, além da idade do paciente. Objetivo: detalhar as etapas clínicas de reabilitação estética e funcional com facetas diretas em resina composta em incisivos centrais com histórico de traumatismo dento-alveolar. Relato de Caso: Paciente do gênero feminino, 12 anos, recebeu atendimento de urgência onde foi constatado fratura de esmalte e extrusão do dente 12, fratura de esmalte e dentina e avulsão do dente 11, e fratura de esmalte e dentina e subluxação do dente 21. Foi executado reposicionamento dos dentes 12 e 21, reimplante e endodontia do elemento 11 e restaurações provisórias nos três elementos dentários traumatizados. Após a remoção da contenção semi-rígida e das restaurações provisórias, faceta direta em resina composta nano-híbrida foi confeccionada nos incisivos centrais superiores e classe IV no incisivo lateral direito. Matriz de silicone foi utilizada para auxiliar na reconstrução da face palatina. Para melhor biomimetismo ótico, optou por realizar a técnica estratificada, com resina de dentina opaca (OA2) e resina de esmalte (A2) na última camada. Resultado: recuperou- -se função e estética esperados tanto pelo paciente quanto pela equipe executora. Conclusão: a utilização de resina composta para restauração pós-traumatismo dento-alveolar permitem o sucesso estético e funcional do tratamento reabilitador.
Sports accidents related to dento-alveolar trauma are highly prevalent among children and its treatment depends on the fracture extension, periodontal and endodontic conditions, beyond the age of the patient. The purpose of this case report is to detail the clinical stages of aesthetic and functional rehabilitation with direct composite resin veneers in central incisors with a history of dento- -alveolar trauma. Female patient, 12 years old, received urgency assistance, when enamel fracture and extrusin was observed on tooth 12, enamel and dentin fracture and avulsion on tooth 11, and enamel and dentin fracture and subluxation on tooth 21. The repositioning of the teeth 12 and 21 was performed, and the reimplant and endodontics treatment on tooth 11; beyond provisional resotation. After removal of the semi-rigid containment and temporary restoration, direct veneers confecctioned with nano-hybrid composite resin was made in upper central incisors, and a class IV on the right lateral incisor. Silicone matrix was used to aid the reconstrutction of the palatal face. In order to best optical biomimicry, the stratification technique was performed, with opaque dentin resin (OA2) and enamel resin (A2) in the superficial layer. As a result, the function and aesthetic were recoverd as expected both by patient and dentists. It is concluded that the use of composite resin provides aesthetic and functional rehabilitation treatment succes associated with dento-alveolar trauma.
