Hardness of celluloid strip-finished or polished composite surfaces with time

Park, Sung Ho; Krejci, Ivo; Lutz, F

doi:10.1016/s0022-3913(00)70067-9

Cited by 19 publications

(23 citation statements)

References 16 publications

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“…This indicates that additional polymerization occurred during the five days in which the specimens were stored, in agreement with the results from several previous studies. 4,[13][14][15] Non-reacted free radicals remain in composites even after light activation and react with free monomers to produce a continued polymerization chain reaction. This additional polymerization by free radicals occurs considerably during the first hour and has been reported to persist over the course of one month.…”

Section: Discussionmentioning

confidence: 99%

“…Depending on the type of composite used, the thickness of the OIL is between 10 and 200 μ m. [1][2][3] The OIL adversely affects the prognosis of composite restorations since it reduces surface hardness, wear resistance, and marginal adaptation of composite restorations. [3][4][5] The OIL cannot be completely removed by occlusal adjustment, finishing, or polishing procedures after curing, and the partial remnants of the OIL reduce the quality of the final restoration. Therefore, in order to minimize the OIL as much as possible, its formation can be reduced by curing the composite after inhibiting oxygen contact either through the use of a Mylar strip or application of glycerin to the composite surface.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, in order to minimize the OIL as much as possible, its formation can be reduced by curing the composite after inhibiting oxygen contact either through the use of a Mylar strip or application of glycerin to the composite surface. [3][4][5] A Mylar strip or plastic matrix can be used for proximal and bucco-lingual cavities, but glycerin application is more effective for complicated occlusal cavities and areas with limited access.…”

Section: Introductionmentioning

confidence: 99%

“…4 When ceramic restorations are adhesively luted with resin cements, OIL formation can be prevented by curing the resin cement with a surface application of glycerin. 5 However, there is a lack of studies that quantitatively compare the effects of Mylar strip use, application of glycerin, and surface polishing.…”

Section: Introductionmentioning

confidence: 99%

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Effect of glycerin on the surface hardness of composites after curing

Park

Lee

2011

J Korean Acad Conserv Dent

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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.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of glycerin on the surface hardness of composites after curing

Park

Lee

2011

J Korean Acad Conserv Dent

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“…It has been reported that the microhardness of a celluloidstrip finished composite surface was lower than the composite surface itself. 18 Finishing the composite surface with a celluloid-strip can produce the smoothest composite surface. However, the celluloid-strip finished composite surface discolors more than a polished one, probably due to its high resin concentration on the surface.…”

Section: Discussionmentioning

confidence: 99%

Surface Hardness of Resin Composites After Staining and Bleaching

Ökte

Villalta

Garcı́a-Godoy

et al. 2006

Operative Dentistry

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SUMMARYThis study investigated the effect of 3 staining solutions and 3 over-the-counter tooth-bleaching systems on the microhardness of 2 dental resin composites. Forty-five specimens of Filtek Supreme and Esthet-X were randomly assigned to 3 groups. Over a 40-day test period, the specimens in each group (n=15) were immersed in 1 of the 2 staining solutions (coffee and red wine) or distilled water as the control for 3 hours a day at room temperature. The 15 specimens in each staining group were further randomly divided into 3 subgroups, and the specimens in each subgroup (n=5) were bleached using one of the bleaching agents (Night Effects, Simply White Night and Opalescence Quick). Surface hardness was measured at 24 hours after polymerization (baseline), after staining and after bleaching. Means and standard deviations were calculated, and the data were analyzed using repeatedmeasures analysis of variance and Duncan's Test. The microhardness of Esthet-X was significantly higher than Filtek Supreme at baseline (p<0.01). All specimens of both materials immersed in coffee and wine revealed a significant hardness decrease compared to baseline values (p<0.05). In the control group, microhardness was increased, and this increase was statistically significant for Filtek Supreme (p<0.05). After bleaching, there was a significant decrease in mean microhard-

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Biofilm formation affects surface properties of novel bioactive glass-containing composites

2015

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Objectives This study investigated the effects of bacterial biofilm on the surface properties of novel bioactive glass (BAG)-containing composites of different initial surface roughness. Methods BAG (65 mole% Si; 4% P; 31% Ca) and BAG-F (61% Si; 31% Ca; 4% P; 3% F; 1% B) were synthesized by the sol-gel method and micronized (size ~0.1–10 µm). Composites with 72 wt% total filler load were prepared by replacing 15% of the silanized Sr glass with BAG, BAG-F, or silanized silica. Specimens (n=10/group) were light-cured and divided into 4 subgroups of different surface roughness by wet polishing with 600 and then up to 1200, 2400, or 4000 grit SiC. Surface roughness (SR), gloss, and Knoop microhardness were measured before and after incubating in media with or without a S. mutans (UA 159) biofilm for 2 wks. Results were analyzed with ANOVA/Tukey’s test (α = 0.05). Results The SR of the BAG-containing composites with the smoothest surfaces (2400/4000 grit) increased in media or bacteria; the SR of the roughest composites (600 grit) decreased. The gloss of the smoothest BAG-containing composites decreased in bacteria and media-only, but more in media-alone. The microhardness of all of the composites decreased with exposure to media or bacteria, with BAG-containing composites affected more than the control. Significance Exposure to bacterial biofilm and its media produced enhanced roughness and reduced gloss and surface microhardness of highly polished dental composites containing a bioactive glass additive, which could affect further biofilm formation, as well as the esthetics, of restorations made from such a material.

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Hardness of celluloid strip-finished or polished composite surfaces with time

Cited by 19 publications

References 16 publications

Effect of glycerin on the surface hardness of composites after curing

Effect of glycerin on the surface hardness of composites after curing

Surface Hardness of Resin Composites After Staining and Bleaching

Biofilm formation affects surface properties of novel bioactive glass-containing composites

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