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Dear Colleagues,

One of the main requirements of dental materials in service is that mechanical properties are suitable to the task. Dental materials can be classified into several categories according to different clinical purposes, so the requirements for mechanical properties are also different. Therefore, it is necessary to understand the behavior of different dental materials under specific mechanical challenges in the oral environment and know how to optimize it to face the clinical requirement.

This Special issue is intended to collect recent advances in the mechanical behavior of dental materials. Research articles, review articles, and short communication concerned with mechanical characterization of novel dental materials, new mechanical testing methods, improvement of mechanical properties, and analytical and modeling studies of dental materials are all welcome.

Dr. Jingwei He
Guest Editor

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Keywords

dental materials
mechanical testing
mechanical characterization
reinforcement
adhesion
durability
biomechanical simulation

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Research

12 pages, 2136 KiB

Open AccessArticle

Effect of Light-Sources and Thicknesses of Composite Onlays on Micro-Hardness of Luting Composites

by Francesco De Angelis, Mirco Vadini, Mario Capogreco, Camillo D’Arcangelo and Maurizio D’Amario

Materials 2021, 14(22), 6849; https://doi.org/10.3390/ma14226849 - 13 Nov 2021

Cited by 4 | Viewed by 1511

Abstract

The aim of this study was to compare three different light-curing-units (LCUs) and determine their effectiveness in the adhesive cementation of indirect composite restorations when a light-curing resin cement is used. Two resin composites were selected: Enamel Plus HRI (Micerium) and AURA (SDI). Three thicknesses (3 mm, 4 mm and 5 mm) were produced and applied as overlays and underlays for each resin composite. A standardized composite layer was placed between underlay and overlay surfaces. Light curing of the resin-based luting composites was attained through the overlay filters using LCUs for different exposure times. All specimens were allocated to experimental groups according to the overlay thickness, curing unit and curing time. Vickers Hardness (VH) notches were carried out on each specimen. Data were statistically evaluated. The curing unit, curing time and overlay thickness were significant factors capable of influencing VH values. The results showed significantly decreased VH values with increasing specimen thickness (p < 0.05). Significant differences in VH values were found amongst the LCUs for the various exposure times (p < 0.05). According to the results, a time of cure shorter than 80 s (with a conventional quartz–tungsten–halogen LCU) or shorter than 40 s (with a high-power light-emitting diode (LED) LCU) is not recommended. The only subgroup achieving clinically acceptable VH values after a short 20 s curing time included the 3 mm-thick overlays made out of the AURA composite, when the high-power LED LCU unit was used (VH 51.0). Composite thickness has an intense effect on polymerization. In clinical practice, light-cured resin cements may result in insufficient polymerization for high thickness and inadequate times. High-intensity curing lights can attain the sufficient polymerization of resin cements through overlays in a significantly shorter time than conventional halogen light. Full article

(This article belongs to the Special Issue Mechanical Behavior of Dental Materials)

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