Gypsum Materials

Darvell, B.W.

doi:10.1016/b978-0-08-101035-8.50002-x

Cited by 12 publications

(10 citation statements)

References 19 publications

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“…PMMA has also acted as a primary model to influence the development of other materials for use in dentistry; however, the inherent mechanical properties of PMMA appliances and products remain less than ideal [2].…”

Section: Introductionmentioning

confidence: 99%

Novel Poly(Methyl Methacrylate) Containing Nanodiamond to Improve the Mechanical Properties and Fungal Resistance

et al. 2019

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Herein we evaluate the effect of nanodiamond (ND) incorporation on the mechanical properties of poly(methyl methacrylate) (PMMA) nanocomposite. Three quantities of ND (0.1, 0.3, and 0.5 wt.%) were tested against the control and zirconium oxide nanoparticles (ZrO). Flexural strength and elastic modulus were measured using a three-point bending test, surface hardness was evaluated using the Vickers hardness test, and surface roughness was evaluated using atomic force microscopy (AFM), while fungal adhesion and viability were studied using Candida albicans. Samples were also analyzed for biofilm thickness and biomass in a saliva-derived biofilm model. All groups of ND-PMMA nanocomposites had significantly greater mean flexural strengths and statistically improved elastic modulus, compared to the control and ZrO groups (P < 0.001). The Vickers hardness values significantly increased compared to the control group (P < 0.001) with 0.3% and 0.5% ND. ND addition also gave significant reduction in fungal adhesion and viability (P < 0.001) compared to the control group. Finally, salivary biofilm formation was markedly reduced compared to the ZrO group. Hence, the incorporation of 0.1–0.5 wt.% ND with auto- polymerized PMMA resin significantly improved the flexural strength, elastic modulus, and surface hardness, and provided considerable fungal resistance.

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Section: Introductionmentioning

confidence: 99%

Novel Poly(Methyl Methacrylate) Containing Nanodiamond to Improve the Mechanical Properties and Fungal Resistance

et al. 2019

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“…include the potential for non-homogenous mixing since the two components are folded, either by hand (rarely) or Kenics mixer, resulting in non-optimal reaction conditions and the incorporation of air bubbles [82]. The requirement of lower viscosities to enable mixing is usually achieved by reducing filler loading, which may also reduce mechanical properties.…”

Section: Emerging and Potential Future Technologies For Deep Photocuringmentioning

confidence: 99%

Shining a light on high volume photocurable materials

2018

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Spatial and temporal control is a key advantage for placement and rapid setting of light-activated resin composites. Conventionally, placement of multiple thin layers (<2mm) reduces the effect of light attenuation through highly filled and pigmented materials to increase polymerisation at the base of the restoration. However, and although light curing greater than 2mm thick layers is not an entirely new phenomenon, the desire amongst dental practitioners for even more rapid processing in deep cavities has led to the growing acceptance of so-called "bulk fill" (4-6mm thick) resin composites that are irradiated for 10-20s in daily clinical practice. The change in light transmission and attenuation during photopolymerisation are complex and related to path length, absorption properties of the photoinitiator and pigment, optical properties of the resin and filler and filler morphology. Understanding how light is transmitted through depth is therefore critical for ensuring optimal material properties at the base of thick increments. This article will briefly highlight the advent of current commercial materials that rationalise bulk filling techniques in dentistry, the relationship between light transmission and polymerisation and how optimal curing depths might be achieved.

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“…The other disadvantage of traditional chrome castings is the poor aesthetics due to their metallic color and as a result, resin‐based polymer materials have come onto the market in an attempt to provide a more aesthetic material. However, it has been suggested that resin‐based polymer material's inherent mechanical properties mean that to achieve sufficient retention, a clasping unit needs to be bulkier than a metal clasping unit (Akl & Stendahl, 2022 ; Pospiech et al, 2012 ; Vermeulen et al, 1996 ; Zhao & Wang, 2014 ). From a biomechanical point of view, support and retention are key considerations to achieving a successful outcome.…”

Section: Introductionmentioning

confidence: 99%

“…However, a retentive clasp undergoes repeated stress caused by dynamic movement in the mouth including insertion and removal of the RPD. The failure of the retentive clasp has been reported as a complication (Vermeulen et al, 1996 ). Past studies stated that 15% of RPD repairs were caused by a fracture of the metal framework, while 19% of cast cobalt‐chromium (CoCr) RPD clasps fractured after an average of 4.5 years (Spiekermann, 1975 ).…”

Section: Introductionmentioning

confidence: 99%

Fatigue behavior of removable partial denture cast and laser‐sintered cobalt‐chromium (CoCr) and polyetheretherketone (PEEK) clasp materials

Zheng

Aarts

et al. 2022

Clinical & Exp Dental Res

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Objective: To investigate the fatigue behavior of cast and laser-sintered cobaltchromium (CoCr) and polyetheretherketone (PEEK) material for a removable partial denture (RPD) clasps.Methods: Dumbbell-shaped specimens were digitally designed with the center part of the dumbbell being a half-round shape at the cross-sectional dimension of 1.25 mm to simulate a typical clasp design and dimensions. A fatigue machine with an offset axis rotation system simulated a typical undercut depth of 0.25, 0.50, and 0.75 mm. Each group was subjected to 30,000 fatigue cycles (simulating 21 years) or till specimen failure. Before testing, the stress value at each undercut depth for each specimen was established in a universal testing machine and SN curves were plotted for each group. Data were statistically analyzed using Kruskal-Wallis and post hoc tests. The fractured surfaces were analyzed using SEM.

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Gypsum Materials

Cited by 12 publications

References 19 publications

Novel Poly(Methyl Methacrylate) Containing Nanodiamond to Improve the Mechanical Properties and Fungal Resistance

Novel Poly(Methyl Methacrylate) Containing Nanodiamond to Improve the Mechanical Properties and Fungal Resistance

Shining a light on high volume photocurable materials

Fatigue behavior of removable partial denture cast and laser‐sintered cobalt‐chromium (CoCr) and polyetheretherketone (PEEK) clasp materials

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