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J Korean Acad Pediatr Dent. 2008;35(3): 418-426.
PROPERTIES OF FLUORIDE-RELEASING RESIN COMPOSITE RESTORATIVE MATERIALS
Sang-Hoon Kim, Byeong-Ju Baik, Jae-Gon Kim, Yeon-Mi Yang, Jeong-Yeol Park
Department of Pediatric Dentistry and Institute of Oral Bioscience, School of Dentistry, Chonbuk National University
Corresponding Author: Byeong-Ju Baik ,Tel: 063-250-2128, Email: pedodent@chonbuk.ac.kr
Received: May 22, 2008;  Accepted: June 4, 2008.
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ABSTRACT
The objectives of this study were to examine the properties of fluoride-releasing resin composite restorative materials. Four commercially available compomer materials (Compoglass F: CF, Dyract® AP: DA, Dyract® flow: DF, F2000: FT) and one fluoride-releasing composite resin (Tetric® Ceram: TC) were selected as experimental materials. Rectangular-shaped tensile test specimens were fabricated in a teflon mold giving 5 ㎜ in gauge length and 2 ㎜ in thickness. Disk-shaped specimens were fabricated in the split teflon mold with diameter of 15 ㎜ and thickness of 1 ㎜. After curing for an hour, specimens were immersed in deionized water at 37 ℃±1 ℃ for 30 days. All specimens were thermocycled for 10,000 cycles with 15 seconds of dwelling time in each 5 ℃ and 55 ℃ water baths. Toothbrush abrasion test was conducted under a load of 1.5 N and the abraded surfaces were examined with surface roughness tester (SV-3000, Mitutoyo Co, Japan) and SEM (JSM-5800, JEOL, Japan). Fluoride recharging was done by toothbrushing for 3 min. using a fluoride toothpaste (Perio Alpine Herb, LG Household & Health Care, Korea). The results obtained were summarized as follows; 1. The highest tensile strength value of 32.3 MPa was observed in TC group and the lowest value of 16.8 MPa was observed in CF group. The tensile strength of TC group was significantly higher than those of CF and DF groups (P<0.05). 2. The lowest Ra value of 0.287 was observed in TC group and the highest value of 1.516 was observed in FT group. The Ra value of FT group was significantly higher than other groups (P<0.05). 3. The abraded surfaces revealed the increase of surface roughness due to the protrusion and missing of filler particles. 4. The release of fluoride of compomers after tooth brushing by Perio Alpine Herb was initially large and then followed by small and continuously. But it remains small and constant in fluoride-releasing composite resin of TC. 5. The highest value of fluoride release after toothbrushing by Perio Alpine Herb was 2.064 ㎍/㎠ in CF group and the lowest value was 0.119 ㎍/㎠ in TC group. The amount of fluoride release of CF group was significantly higher than other groups (P<0.05).
Keywords: Fluoride-releasing resin composite | Compomer | Fluoride-releasing
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