EFFECT OF PRE-HEATING ON SOME PHYSICAL PROPERTIES OF COMPOSITE RESIN
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초록
The purpose of this study was to evaluate the effect of pre-heating on some physical properties of composite resin. Eighty extracted, noncarious human molars were used in the present study. Four different temperatures of composite resin were used: 4℃, 17℃, 48℃, and 56℃. The 4℃ and 17℃ values represented the refrigerator storage temperature and room temperature respectively. For 48℃ and 56℃, composite resin was heated to the temperatures. As physical properties of composite resin, shear bond strength, microhardness, and degree of conversion were measured. The data for each group were subjected to one-way ANOVAs followed by the Tukey's HSD test at 95% confidence level. Both in enamel and dentin, among composite resin of 4℃, 17℃, 48℃, and 56℃, the pre-heated composite resin up to 56℃ revealed the highest shear bond strength, and pre-heated composite resin to the higher temperature revealed higher shear bond strength. Microhardness value was also higher with composite resin of higher temperature. Degree of conversion was also higher with composite resin of the higher temperature. In this study, it seems that pre-heating composite resin up to the higher temperature may show higher shear bond strength, higher microhardness value, and higher degree of conversion. Therefore, when using composite resin in the clinic, preheating the composite resin could be recommended to have enhanced physical properties of it.
Abstract
The purpose of this study was to evaluate the effect of pre-heating on some physical properties of composite resin. Eighty extracted, noncarious human molars were used in the present study. Four different temperatures of composite resin were used: 4℃, 17℃, 48℃, and 56℃. The 4℃ and 17℃ values represented the refrigerator storage temperature and room temperature respectively. For 48℃ and 56℃, composite resin was heated to the temperatures. As physical properties of composite resin, shear bond strength, microhardness, and degree of conversion were measured. The data for each group were subjected to one-way ANOVAs followed by the Tukey's HSD test at 95% confidence level. Both in enamel and dentin, among composite resin of 4℃, 17℃, 48℃, and 56℃, the pre-heated composite resin up to 56℃ revealed the highest shear bond strength, and pre-heated composite resin to the higher temperature revealed higher shear bond strength. Microhardness value was also higher with composite resin of higher temperature. Degree of conversion was also higher with composite resin of the higher temperature. In this study, it seems that pre-heating composite resin up to the higher temperature may show higher shear bond strength, higher microhardness value, and higher degree of conversion. Therefore, when using composite resin in the clinic, preheating the composite resin could be recommended to have enhanced physical properties of it.
참고문헌 (33)
- Freedman G, "Ultraconservative resin restorations", J Can Dent Assoc, 65, pp.579~581 (1999)
- Cook D, "Resin-based restorative materials- a review", Aust Dent J, 29, pp.291~295 (1984)
- Peutzfeldt A, "Influence of selected components on crosslink density in polymer structures", Eur J Oral Sci, 109, pp.282~285 (2004)
- Dickens S, "Photopolymerization kinetics of methacrylate dental resin", Macromolecules, 36, pp.6043~6053 (2003)
- Ferracane L, "Correlation between hardness and degree of conversion during the setting reaction of unfilled dental restorative resins", Dent Mater, 1, pp.11~14 (1985)
- Condon J, "In vitro wear of composite with varied cure, filler level, and filler treatment", J Dent Res, 76(7), pp.1405~1411 (1997)
- Freiberg R, "Evaluation of cure, properties and wear resistance of artglass dental composite", Am J Dent, 11, pp.214~218 (1998)
- Trujillo M, "Thermal effects on composite photopolymerization monitored by real-time NIR", J Dent Res, 82 (2003)
- Draughn R, "Effects of temperature on mechanical properties of composite dental restorative materials", J Biomed mater Res, 15, pp.489~495 (1981)
- Covey A, "Mechanical properties of heat-treated composite restorative materials", J Prosthet Dent, 68, pp.458~461 (1992)
- Ferracane L, "Post-cure heat treatments for composites: Properties and fractography", Dent Mater, 8, pp.290~295 (1992)
- Asmussen E, "Restorative resins: Hardness and strength vs. quantity of remaining double bonds", Scand J Dent Res, 90, pp.484~489 (1982)
- Davidson L, "Structural changes in composite surface material after dry polishing", J Oral Rehabil, 8, pp.431~439 (1981)
- DeGee J, "Annealing as a mechanism of increasing wear resistance of composites", Dent Mater, 6, pp.266~270 (1990)
- Ferracaine J, "Fourier transform infrared analysis of degree of polymerization in unfilled resin- Methods comparison", J Dent Res, 63, pp.1093~1095 (1984)
- Cook W, "Curing kinetics and thermal properties of vinyl ester res", J Appl Poly Sci, 64, pp.769~781 (1997)
- Daronch M, "Polymerization kinetics of pre-heated composite", J Dent Res, 85(1), pp.38~43 (2006)
- Andrzejewska E, "Photopoloymerization kinetics of multifunctional monomers", Prog Poly, 26, pp.605~665 (2001)
- Nicholls J, "Polymerization shrinkage of densely-filled resin composite", Oper Dent, 26(5), pp.498~504 (2001)
- 김기옥, "치경부변연에서 중간층 수복이 구치부 2급 복합레진의미세누출에 미치는 영향에 관한 연구", 대한치과보존학회지, 28(6), pp.467~474 (2003), 대한치과보존학회
- Holmes R, "Composite film thickness at various temperatures", J Dent Res, 83(3265) (2004)
- Freedman G, "Seventh-generation adhesive system", Dent Today, 21, pp.106~111 (2002)
- Bortolotto T, "The effect of temperature on hardness of a light-curing composite", J Dent Res, 82 (2003)
- Walker M, "Influence of environmental condition on dental composite flexural properties", Dent Mater, 22, pp.1002~1007 (2006)
- Daronch M, "Monomer conversion of pre-heated composite", J Dent Res, 84(7), pp.663~667 (2005)
- Opdam J, "Porosities and voids in class I restorations placed by six operators using a packable or syringable composite", Dent Mater, 18, pp.58~63 (2002)
- Bagis H, "Effect of post-cure temperature and heat duration on monomer conversion of photo- activated dental resin composite", Dent Mater, 13, pp.228~232 (1997)
- Sideridou I, "Effect of chemical structure on degree of conversion on light-cured dimethacrylatebased dental resins", Biomaterals, 23, pp.1819~1829 (2002)
- 정진호, "미세-전단 결합 강도 시험을 이용한 상아질 접착제와 수복용 복합레진의 호환성에 관한 연구", 대한치과보존학회지, 29(4), pp.353~364 (2004), 대한치과보존학회
- 한세희, "2단계 자가 산부식 접착제와 결합된 광중합과 화학중합 복합레진의 법랑질 접착", 대한치과보존학회지, 32(3), pp.169~179 (2007), 대한치과보존학회
- Sun Y, "Study on mono-dispersed nano-sized silica by surface modification for underfill application", J Colloid interface Sci, 292, pp.36~444 (2005)
- Taira M, "Curing performances of four experimental Bis-GMA based binary monomer mixtures for dental visible-light cured composite resin inlays", J Mater Sci Lett, 13, pp.1229~1231 (1994)
- Kurachi C, "Hardness evaluation of a dental composite polymerized with experimental LED-based devices", Dent Mater, 17, pp.309~315 (2001)