Use of standards in papers published in dental journals

Bona, Álvaro Della; Bello, Yuri Dal; Sartoretto, Suelen Cristina

doi:10.1590/s0103-64402012000500001

Cited by 9 publications

(4 citation statements)

References 4 publications

(2 reference statements)

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“…Shore D hardness test methods were performed in accordance with ASTM D 2240 and (DIN) Deutsches Institut fur Normung 53 505 for rubber and hard plastics. [ 16 ] The surface hardness of 5% Cloisite Nylon 6 is 83 Shore D Hardness. The results of this study demonstrated that the mean surface hardness of Group II specimens (1 wt% nanoclay) tested in the current work was higher than that reported for 5% Cloisite Nylon 6.…”

Section: Discussionmentioning

confidence: 99%

Effect of incorporation of nanoclay on the properties of heat cure denture base material: An In vitro study

Joseph

Mathew

et al. 2019

Contemp Clin Dent

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Purpose: The aim of the study was to evaluate the effect of incorporation of organically modified nanoclay in 1%, 3%, and 5% by weight on the flexural strength, surface hardness, and linear polymerization shrinkage of heat cure denture base material. Materials and Methods: One hundred and twenty specimens of heat-polymerized acrylic resin were fabricated. The specimens were divided into four groups ( n = 10) coded I to IV. Group I was the control group (unmodified acrylic resin specimens). The specimens of the remaining three groups were reinforced with nanoclay (organically modified montmorillonite) nanoparticles to achieve loadings of 1%, 3%, and 5% by weight. The resulting nanocomposites were subjected to mechanical testing and were characterized using X-ray diffraction, scanning electron microscope, and transmission electron microscope. Results: The statistical analysis showed that there was no significant increase in flexural strength within and between the groups. The most significant increase in surface hardness was observed between Group I (control) and Group II (1% nanoclay). Linear polymerization shrinkage of the specimens showed a significant decrease in the control and all the experimental groups. Conclusion: Addition of 1 wt% nanoclay to polymethyl methacrylate heat cure denture base material could enhance the surface hardness and reduce the linear polymerization shrinkage of the resin. However, there was no significant increase in flexural strength of the resulting nanocomposite.

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Section: Discussionmentioning

confidence: 99%

Effect of incorporation of nanoclay on the properties of heat cure denture base material: An In vitro study

Joseph

Mathew

et al. 2019

Contemp Clin Dent

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“…Della Bona and colleagues have considered the use of documentary standards in international dental journals [59] and recommended that journal editors encourage authors to use standards more often. Additional cause for optimism arises from in vitro tests on simulated or actual restorations that mimic in vivo clinical fractures [e.g., 60,61,62,63,64].…”

Section: Discussionmentioning

confidence: 99%

On edge chipping testing and some personal perspectives on the state of the art of mechanical testing

Quinn

2015

Dental Materials

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Objective The edge chipping test is used to measure the fracture resistance of dental restoration ceramics and resin composites. This paper focuses on the progress of evaluating chipping resistance of these materials and also on the progress of standardization of this test method. This paper also makes observations about the state of the art of mechanical testing of ceramic and composite restorative materials in general. Interlaboratory comparative studies (“round robins”) are recommended. Methods An edge chipping machine was used to evaluate dozens of materials including porcelains, glass ceramics, aluminas, zirconias, filled resin-composites, new hybrid ceramic-resin composites, laminated composite ceramics, and even polymethyl methacrylate based denture materials. Force versus distance data were collected over a broad range with different indenters. Several chipping resistance parameters were quantified. Results Older restorative materials such as feldspathic porcelains and veneering materials had limited chipping resistance, but more modern ceramics and filled composites show significant improvements. A yttria-partially stabilized zirconia had the greatest resistance to chipping. Much of the early work on edge chipping resistance of brittle materials emphasized linear force versus distance trends obtained with relatively blunt Rockwell C indenters. More recently, trends for dental restorative materials with alternative sharper indenters have been nonlinear. A new phenomenological model with a simple quadratic function fits all data exceptionally well. It is loosely based on an energy balance between indenter work and fracture and deformation energies in the chipped material. Significance Although a direct comparison of our laboratory scale tests on idealized simple geometries to clinical outcomes has not yet been done, anecdotal evidence suggests the procedure does produce clinically relevant rankings and outcomes. Despite the variations in the trends and indenters, comparisons between materials can easily be made by chipping convenient block-shaped specimens with sharp conical 120°, Vickers, or Rockwell C indenters at a defined edge distance of 0.5 mm. Broad distance ranges are recommended for trend evaluation. This work has provided important information for standardization.

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“…International Standard for Dentistry Ceramic Materials (ISO 6872:2008) is one of the most reported standards used by the dental scientific community in the studying of dental ceramic materials [2]. This document presents three flexural tests to evaluate the fracture strength of ceramics: three-point bending, four-point bending, and biaxial flexure (piston-on-three-ball configuration) [3].…”

Section: O Presente Estudo Avaliou a Influência Da Geometria Do Corpomentioning

confidence: 99%

Influence of the geometry of ceramic specimens on biaxial flexural strength: experimental testing and finite element analysis

et al. 2018

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This study evaluated the influence of the geometry of ceramic specimens (disc vs. square plate) on the biaxial flexural strength (BFS) using an experimental set and finite element analysis (FEA). Leucite glass-ceramic blocks were used in the preparation of disc (D; n=14) and square plate (S; n=13) specimens with the same lower (tensile) surface area. The specimens were subjected to a piston-on-three-ball flexural test (ISO 6872:2008). To calculate the BFS of the S group, the specimen radius, indicated by the ISO 6872:2008 formula for discs, was replaced by half of the side length. FEA compared the pattern of stress distribution and the first principal stress between D and S specimens having the same and different lower (tensile) surface area. Student's t-test showed no difference (p=0.85) in the BFS between D (95.0±9.6 MPa) and S (84.3±10.3 MPa). FEA indicated a similar pattern of stress distribution, with almost no difference in the first principal stress of discs and square plates with the same lower (tensile) surface area. In the experimental condition investigated, square plate ceramic specimens can be used in piston-on-three-ball tests. For the calculation of the BFS, the specimen radius may be replaced by half side length of the square specimen.

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Use of standards in papers published in dental journals

Cited by 9 publications

References 4 publications

Effect of incorporation of nanoclay on the properties of heat cure denture base material: An In vitro study

Effect of incorporation of nanoclay on the properties of heat cure denture base material: An In vitro study

On edge chipping testing and some personal perspectives on the state of the art of mechanical testing

Influence of the geometry of ceramic specimens on biaxial flexural strength: experimental testing and finite element analysis

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