Restorative Dentistry & Endodontics

Basic Research

Effect of glycerin on the surface hardness of composites after curing: Hyun-Hee Park, In-Bog Lee; J Korean Acad Conserv Dent 2011;36(6):483-489. Published online November 30, 2011; DOI: https://doi.org/10.5395/JKACD.2011.36.6.483

Objectives

The purpose of this study was to examine the effect of glycerin topical application on the surface hardness of composite after curing.

Materials and Methods

A composite (Z-250, 3M ESPE) was packed into a disc-shaped brass mold and light cured according to one of the following protocols. Group 1 (control) was exposed to air and light cured for 40 sec, group 2 was covered with a Mylar strip and light cured for 40 sec, group 3 was surface coated with glycerin and light cured for 40 sec, and group 4 was exposed to air and light cured for 20 sec and then surface coated with glycerin and cured for additional 20 sec. Twenty specimens were prepared for each group. The surface hardnesses of specimens were measured with or without polishing. Five days later, the surface hardness of each specimen was measured again. Data were analyzed by three-way ANOVA and Tukey's post hoc tests.

Results

The surface hardnesses of the unpolished specimens immediately after curing decreased in the following order: group 2 > 3 > 4 > 1. For the polished specimens, there was no significant difference among the groups. Within the same group, the hardness measured after five days was increased compared to that immediately after curing, and the polished specimens showed greater hardness than did the unpolished specimens.

Conclusions

The most effective way to increase the surface hardness of composite is polishing after curing. The uses of a Mylar strip or glycerin topical application before curing is recommended.

Citations

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Original Article

Surface roughness of universal composites after polishing procedures: Jae-Yong Lee, Dong-Hoon Shin; J Korean Acad Conserv Dent 2003;28(5):369-377. Published online September 30, 2003; DOI: https://doi.org/10.5395/JKACD.2003.28.5.369

Abstract PDF PubReader ePub

The aim of this study was to evaluate the effect of two polishing methods and chemical conditioning on the surface of hybrid composites.

Ninety cylindrical specimens (diameter: 8 mm, depth: 2 mm) were made with three hybrid composites - Filtek Z250, Tetric Ceram, DenFil. Specimens for each composite were randomly divided into three treatment subgroups - ① Mylar strip (no treatment), ② Sof-Lex XT system, ③ PoGo system. Average surface roughness(Ra) was taken using a surface profilometer at the time of setting and after immersion into 0.02N lactic acid for 1 week and 1 month. Representative specimens were examined by scanning electron microscopy. The data were analyzed using ANOVA and Scheffe's tests at 0.05% significance level.

The results were as follows:

Mylar strip resulted in smoother surface than PoGo and Sof-Lex system(p<0.001). Sof-Lex system gave the worst results.

Tetric Ceram was smoother than DenFil and Z250 when cured under only mylar strip. However, it was significantly rougher than other materials when polished with PoGo system.

All materials showed rough surface after storage in 0.02N lactic acid, except groups polished with a PoGo system.

The PoGo system gave a superior polish than Sof-Lex system for the three composites. However, the correlation to clinical practice may be limited, since there are several processes, such as abrasive, fatigue, and corrosive mechanisms. Thus, further studies are needed for polishing technique under in vivo conditions.

Citations

Citations to this article as recorded by

The evaluation of surface roughness and polishing time between polishing systems
Ye-Mi Kim, Su-Jung Shin, Min-Ju Song, Jeong-Won Park
Journal of Korean Academy of Conservative Dentistry.2011; 36(2): 119. CrossRef
Surface roughness of experimental composite resins using confocal laser scanning microscope
JH Bae, MA Lee, BH Cho
Journal of Korean Academy of Conservative Dentistry.2008; 33(1): 1. CrossRef
Evaluation on the abrasion resistance of a surface sealant
Soo-Mee Kim, Sae-Hee Han, Young-Gon Cho
Journal of Korean Academy of Conservative Dentistry.2007; 32(3): 180. CrossRef
Surface roughness of composite resin according to finishing methods
Jeong-Bum Min, Kong-Chul Cho, Young-Gon Cho
Journal of Korean Academy of Conservative Dentistry.2007; 32(2): 138. CrossRef
Influence of the Surface roughness on translucency and surface color of the dental composite resins
Kyu-Jeong Cho, Su-Jung Park, Hyun-Gu Cho, Dong-Jun Kim, Yun-Chan Hwang, Won-Mann Oh, In-Nam Hwang
Journal of Korean Academy of Conservative Dentistry.2006; 31(4): 312. CrossRef

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