Evaluation of Delamination of Dental Composite Restoration using Infrared Lock-in Thermography

Nano size of ceramic filler (nanofiller) are tend to possess difficulties to be covered by resin matrix due to large surface area to volume ratio. Addition of aceton known as the diluent agent by introducing more content of filler as well as helping distribution of the filler in the resin matrix in application of dental composite restoration. In this study, a total 24 specimens of dental composite prototype; nanofiller-TMPS and nanofiller-MPTS were prepared using a customized acrylic mold and they were divided into two groups based on filler/resin ratio (n=6 each group). In the process of dental composite making, acetone were added into resin; 1 ml (filler/resin, 50/50) and 5 ml (filler/resin, 80/20) untill specific consistency obtained. The specimens were stored in distilled water for 24 hours at 37°C then subjected to hardness test using Vickers hardness tester machine, LECO – Japan M– 400–H1 with the load of 200 grams for 15 seconds (ADA Specification No. 27). Data were statistically analyzed using t independent test (α=0.05). The result revealed that dental composite prototype contain nanofiller-MPTS with filler/resin rasio (50/50) were statistically significant higher than dental composite prototype contain nanofiller-TMPS with same ratio (p<0.05). Otherwise, dental composite prototype with filler/resin ratio (80/20) were no observed statistically significant differences for both nanofiller-TMPS and nanofiller-MPTS (p>0.05). As conclusion, nanofiller modified MPTS are more effective to elevate surface hardness of dental composite prototype than nanofiller-TMPS for 50/50 filler/resin ratio

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Acoustic emission characterization of the marginal disintegration of dental composite restoration

Composites Part A Applied Science and Manufacturing ◽

10.1016/j.compositesa.2011.01.019 ◽

2011 ◽

Vol 42 (6) ◽

pp. 604-611 ◽

Cited By ~ 10

Author(s):

Nak-Sam Choi ◽

Ja-Uk Gu ◽

Kazuo Arakawa

Keyword(s):

Acoustic Emission ◽

Dental Composite ◽

Composite Restoration

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Characterization of Dental Lab Putty Materials Components Made from Glutinous Rice

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.829.247 ◽

2019 ◽

Vol 829 ◽

pp. 247-251

Author(s):

Kosterman Usri ◽

Veni Takarini ◽

Renny Febrida

Keyword(s):

Low Cost ◽

Particle Morphology ◽

Dental Composite ◽

Future Research ◽

Glutinous Rice ◽

Sample Composition ◽

Bovine Gelatin ◽

Class Iv ◽

Composite Restoration

This paper presents the preliminary results from the experiment of making lab putty from glutinous rice. The experiment aims to use natural, safe, and cheap ingredients to synthesis reliable products of making direct palatal matrix index of class IV dental composite restoration, by characterizing the particle morphology and how each element binds to one another as well as its compositions. Hand manipulation on lab putty was carried out on two different samples accompanied by two fabricated samples with size of 4x2 cm. Particle morphology was characterized with JEOL Scanning Electron Microscope (SEM) and sample composition confirmed using Electron Dispersive Spectroscopy (EDS). The SEM result revealed that sample A shows smooth morphology from well-mixed glutinous rice tend bind with silicon rubber paste and bovine gelatin. Meanwhile, sample B shows hexagonal and polyhedral morphology that appears to be similar agglomerated form to the sample that marketed available (sample C and D). From the EDS result, it can be confirmed that compositionally, the four samples are similar. To conclude, lab putty made from glutinous rice can be considered as an option of low cost and safe palatal matrix index for class IV composite restoration. Better development of mechanical properties shall be conducted by future research.

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Light-cured dental composites characterization by Electron Microscopy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100175272 ◽

1990 ◽

Vol 48 (4) ◽

pp. 428-429

Author(s):

B. M. Culbertson ◽

M. L. Devinev ◽

E. C. Kao

Keyword(s):

Electron Microscopy ◽

Mechanical Analysis ◽

Service Performance ◽

Dental Composite ◽

Dental Composites ◽

Neat Resin ◽

Scanning Calorimetry ◽

Research Meeting ◽

Formulation Variables

The service performance of current dental composite materials, such as anterior and posterior restoratives and/or veneer cements, needs to be improved. As part of a comprehensive effort to find ways to improve such materials, we have launched a broad spectrum study of the physicochemical and mechanical properties of photopolymerizable or visible light cured (VLC) dental composites. The commercially available VLC materials being studied are shown in Table 1. A generic or neat resin VLC system is also being characterized by SEM and TEM, to more fully understand formulation variables and their effects on properties.At a recent dental research meeting, we reported on the differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) characterization of the materials in Table 1. It was shown by DSC and DMA that the materials are substantially undercured by commonly used VLC techniques. Post curing in an oral cavity or a dry environment at 37 to 50°C for 7 or more hours substantially enhances the cure of the materials.

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