5급 와동의 복합레진 수복 시 발생되는 교두굴곡에 관한 연구
Cuspal deflection in class V cavities restored with composite resins
1
조회
0
다운로드
5
인용
0
참고문헌
키워드
초록
The purpose of this study was to evaluate the effect of the polymerization shrinkage and modulus of elasticity of composites on the cusp deflection of class V restoration in premolars. The sixteen extracted upper premolars were divided into 2 groups with similar size. The amounts of cuspal deflection were measured in Class V cavities restored with a flowable composite (Filtek flow) or a universal hybrid composite (Z-250). The bonded interfaces of the sectioned specimens were observed using a scanning electron microscopy (SEM). The polymerization shrinkage and modulus of elasticity of the composites were measured to find out the effect of physical properties of composite resins on the cuspal deflection. The results were as follows. 1. The amounts of cuspal deflection restored with Filtek flow or Z-250 were 2.18 ± 0.92 ㎛ and 2.95 ± 1.13 ㎛, respectively. Filtek flow showed less cuspal deflection but there was no statistically significant difference (p > 0.05). 2. The two specimens in each group showed gap at the inner portion of the cavity. 3. The polymerization shrinkages of Filtek flow and Z-250 were 4.41% and 2.23% respectively, and the flexural modulus of elasticity of cured Filtek flow (7.77 ㎬) was much lower than that of Z-250 (17.43 ㎬). 4. The cuspal deflection depends not only on the polymerization shrinkage but also on the modulus of elasticity of composites.
Abstract
The purpose of this study was to evaluate the effect of the polymerization shrinkage and modulus of elasticity of composites on the cusp deflection of class V restoration in premolars. The sixteen extracted upper premolars were divided into 2 groups with similar size. The amounts of cuspal deflection were measured in Class V cavities restored with a flowable composite (Filtek flow) or a universal hybrid composite (Z-250). The bonded interfaces of the sectioned specimens were observed using a scanning electron microscopy (SEM). The polymerization shrinkage and modulus of elasticity of the composites were measured to find out the effect of physical properties of composite resins on the cuspal deflection. The results were as follows. 1. The amounts of cuspal deflection restored with Filtek flow or Z-250 were 2.18 ± 0.92 ㎛ and 2.95 ± 1.13 ㎛, respectively. Filtek flow showed less cuspal deflection but there was no statistically significant difference (p > 0.05). 2. The two specimens in each group showed gap at the inner portion of the cavity. 3. The polymerization shrinkages of Filtek flow and Z-250 were 4.41% and 2.23% respectively, and the flexural modulus of elasticity of cured Filtek flow (7.77 ㎬) was much lower than that of Z-250 (17.43 ㎬). 4. The cuspal deflection depends not only on the polymerization shrinkage but also on the modulus of elasticity of composites.
참고문헌 (23)
- Watts DC, "Determination of polymerization shrinkage kinetics in visible-light-cured materials: methods development", Dent Mater, 7(4), pp.281~287 (1991)
- Lee IB, "A new method to measure the polymerization shrinkage kinetics of light cured composites", J Oral Rehabil, 32(4), pp.304~314 (2005)
- Lee IB, "The effect of consistency, specimen geometry and adhesion on the axial polymerization shrinkage measurement of light cured composites", Dent Mater, 22(11), pp.1071~1079 (2006)
- Davidson CL, "The competition between the composite-dentin bond strength and the polymerization contraction stress", J Dent Res, 63(12), pp.1396~1399 (1984)
- Neiva IF, "An in vitro study of the effect of restorative technique on marginal leakage in posterior composites", Oper Dent, 23(6), pp.282~289 (1998)
- Holan G, "Clinical, radiographic, SEM evaluation and assessment of microleakage of class II composite restorations", Am J Dent, 2(5), pp.274~278 (1989)
- Eick JD, "Polymerization shrinkage of posterior composite resins and its possible influence on postoperative sensitivity", Quintessence Int, 17(2), pp.103~111 (1986)
- Opdam NJ, "Marginal integrity and postoperative sensitivity in Class 2 resin composite restorations in vivo", J Dent, 26(7), pp.555~562 (1998)
- Pearson GJ, "Cusp movement of molar teeth with composite filling materials in conventional and modified MOD cavities", Br Dent J, 166(5), pp.162~165 (1989)
- Meredith N, "In vitro measurement of cuspal strain and displacement in composite restored teeth", J Dent, 25(3-4), pp.331~337 (1997)
- Segura A, "In vitro posterior composite polymerization recovery following hygroscopic expansion", J Oral Rehabil, 20(5), pp.495~499 (1993)
- Rees JS, "A reappraisal of the incremental packing technique for light cured composite resins", J Oral Rehabil, 31(1), pp.81~84 (2004)
- Abbas G, "Cuspal movement and microleakage in premolar teeth restored with a packable composite cured in bulk or in increments", J Dent, 31(6), pp.437~444 (2003)
- Fleming GJ, "Cuspal movement and microleakage in premolar teeth restored with posterior filling materials of varying reported volumetric shrinkage values", J Dent, 33(2), pp.139~146 (2005)
- Lee MR, "Influence of cavity dimension and restoration methods on the cusp deflection of premolars in composite restoration", Dent Mater, 23(3), pp.288~295 (2007)
- McCullock AJ, "In vitro studies of cuspal movement produced by adhesive restorative materials", Br Dent J, 161(11), pp.405~409 (1986)
- Versluis A, "Does an incremental filling technique reduce polymerization shrinkage stresses?", J Dent Res, 75(3), pp.871~878 (1996)
- Feilzer AJ, "Influence of light intensity on polymerization shrinkage and integrity of restoration-cavity interface", Eur J Oral Sci, 103(5), pp.322~326 (1995)
- Uno S, "Marginal adaptation of a restorative resin polymerized at reduced rate", Scand J Dent Res, 99(5), pp.440~444 (1991)
- Alomari QD, "Effect of liners on cusp deflection and gap formation in composite restorations", Oper Dent, 26(4), pp.406~411 (2001)
- Davidson CL, "Relaxation of polymerization contraction stresses by flow in dental composites", J Dent Res, 63(2), pp.146~148 (1984)
- Br¨annstr¨om M, "Communication between the oral cavity and the dental pulp associated with restorative treatment", Oper Dent, 9(2), pp.57~68 (1984)
- Br¨annstr¨om M, "Fluid flow and pain response in the dentin produced by hydrostatic pressure", Odontol Rev, 20(1), pp.15~30 (1969)
