Evaluation of radiopacity and microhardness of composites submitted to artificial aging

Cruvinel, Diogo Rodrigues; Garcia, Lucas da Fonseca Roberti; Casemiro, Luciana Assirati; Pardini, Luiz Carlos; Pires‐de‐Souza, Fernanda de Carvalho Panzeri

doi:10.1590/s1516-14392007000300021

Cited by 20 publications

(16 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The filler particles of the anterior composite resins are smaller in size and lower in percentage. Therefore, they are more translucent and less radiopaque than the posterior ones (49). In fact, moderate radiopaque materials are preferable to those with a high degree of radiopacity, since the latter can obscure caries adjacent to the restorations (13,19,50).…”

Section: Composite Resinsmentioning

confidence: 99%

Radiopacity of Dental Materials: An Overview

Pekkan¹

2016

Avicenna J Dent Res

View full text Add to dashboard Cite

Context: This study aimed to provide an overview of the literature on the radiopacity of dental materials in order to emphasize its importance. Evidence Acquisition: English-language literature was investigated using manual and electronic searches for the terms "radiopacity," "dental material," "cement," "composite," "ceramic," "endodontic root canal sealer," "bone graft," and "acrylic resin" in the databases of Medline, google scholar, and Scopus up to April 2016. Seventy-nine selected publications, including review articles, original articles, and books, were evaluated. Results: The radiopacity of different dental materials may be lower or higher than that of the replaced tissue depending on the restorative material used. The research revealed that highly-radiopaque materials should not be used in dental restorations, except as bone graft and endodontic root canal filling materials. For most of the dental restorative materials, moderate radiopacity within the range of the replaced dental tissue is recommended. However, the lower radiopacity of polymer-based restorative or prosthetic dental materials is still a significant clinical problem. Conclusions:The author recommends using highly-radiopaque materials whenever possible for treatment of bone defects and root canals. For dental materials that replace clinical crowns, the radiopacity should be within the range of that of the replaced tooth structure (dentin or enamel). The radiopacity of dental cements should be much higher than that of the enamel in order to facilitate detection of the thin cement remnants.

show abstract

Section: Composite Resinsmentioning

confidence: 99%

Radiopacity of Dental Materials: An Overview

Pekkan¹

2016

Avicenna J Dent Res

View full text Add to dashboard Cite

show abstract

“…Some authors 14,19 have reported that an increase in the load percentage results in less water absorption and greater strength of the material. By promoting the degradation of resin composites, accelerated artificial aging may reduce the mechanical properties by degrading the matrix and altering the structural distribution of these particles 9 .…”

Section: Introductionmentioning

confidence: 99%

Analysis of surface hardness of artificially aged resin composites

Tornavoi

Satoa²,

Silva

et al. 2012

Mat. Res.

View full text Add to dashboard Cite

This study evaluated the effect of artificially accelerated aging (AAA) on the surface hardness of eight composite resins: Filtek Z250, Filtek Supreme, 4 Seasons, Herculite, P60, Tetric Ceram, Charisma, and Filtek Z100. Sixteen specimens were made from the test piece of each material, using an 8.0 × 2.0 mm teflon matrix. After 24 hours, eight specimens from each material were submitted to three surface hardness readings using a Shimadzu Microhardness Tester for 5 seconds at a load of 50 gf. The other eight specimens remained in the artificially accelerated aging machine for 382 hours and were submitted to the same surface hardness analysis. The means of each test specimen were submitted to the Kolmogorov-Smirnov test (p > 0.05), ANOVA and Tukey test (p < 0.05). With regard to hardness (F = 86.74, p < 0.0001) the analysis showed significant differences among the resin composite brands. But aging did not influence the hardness of any of the resin composites (F = 0.39, p = 0.53). In this study, there was interaction between the resin composite brand and the aging factors (F = 4.51, p < 0.0002). It was concluded that notwithstanding the type of resin, AAA did not influence surface hardness. However, with regard to hardness there was a significant difference among the resin brands.

show abstract

“…In the oral environment factors such as oral fluids, soft tissues and the surrounding dental structures may affect the radiopacity levels of restorative materials in that low density restorative materials become more visible on a radiograph when the soft tissue and hard dental structures are superimposed. Furthermore, leakage of ions from silicone, barium, strontium, and sodium filler particles into the aqueous medium may result in reduced radiopacity 40) . Future studies are warranted to study the radiopacity of luting cements after aging.…”

Section: Discussionmentioning

confidence: 99%

Radiopacity of different resin-based and conventional luting cements compared to human and bovine teeth

Pekkan

Özcan

2012

Dent. Mater. J.

View full text Add to dashboard Cite

This study evaluated the radiopacity of different resin-based luting materials and compared the results to human and bovine dental hard tissues. Disc specimens (N=130, n=10 per group) (diameter: 6 mm, thickness: 1 mm) were prepared from 10 resin-based and 3 conventional luting cements. Human canine dentin (n=10), bovine enamel (n=10), bovine dentin (n=10) and Aluminium (Al) step wedge were used as references. The optical density values of each material were measured from radiographic images using a transmission densitometer. Al step wedge thickness and optical density values were plotted and equivalent Al thickness values were determined for radiopacity measurements of each material. The radiopacity values of conventional cements and two resin luting materials (Rely X Unicem and Variolink II), were significantly higher than that of bovine enamel that could be preferred for restorations cemented on enamel. Since all examined resin-based luting materials showed radiopacity values equivalent to or greater than that of human and bovine dentin, they could be considered suitable for the restorations cemented on dentin.

show abstract

Evaluation of radiopacity and microhardness of composites submitted to artificial aging

Cited by 20 publications

References 30 publications

Radiopacity of Dental Materials: An Overview

Radiopacity of Dental Materials: An Overview

Analysis of surface hardness of artificially aged resin composites

Radiopacity of different resin-based and conventional luting cements compared to human and bovine teeth

Contact Info

Product

Resources

About