Browse > Article
http://dx.doi.org/10.5395/JKACD.2003.28.6.457

THE EFFECT OF VISCOSITY, SPECIMEN GEOMETRY AND ADHESION ON THE LINEAR POLYMERIZATION SHRINKAGE MEASUREMENT OF LIGHT CURED COMPOSITES  

Lee, In-Bog (Department of Conservative Dentistry, College of Dentistry, Seoul National University)
Son, Ho-Hyun (Department of Conservative Dentistry, College of Dentistry, Seoul National University)
Kwon, Hyuk-Chun (Department of Conservative Dentistry, College of Dentistry, Seoul National University)
Um, Chung-Moon (Department of Conservative Dentistry, College of Dentistry, Seoul National University)
Cho, Byeong-Hoon (Department of Conservative Dentistry, College of Dentistry, Seoul National University)
Publication Information
Restorative Dentistry and Endodontics / v.28, no.6, 2003 , pp. 457-466 More about this Journal
Abstract
The aim of study was to investigate the effect of flow, specimen geometry and adhesion on the measurement of linear polymerization shrinkage of light cured composite resins using linear shrinkage measuring device. Four commercially available composites - an anterior posterior hybrid composite Z100, a posterior packable composite P60 and two flowable composites, Filtek flow and Tetric flow-were studied. The linear polymerization shrinkage of composites was determined using 'bonded disc method' and 'non-bond-ed' free shrinkage method at varying C-factor in the range of 1∼8 by changing specimen geometry. These measured linear shrinkage values were compared with free volumetric shrinkage values. The viscosity and flow of composites were determined and compared by measuring the dropping speed of metal rod under constant load. In non-bonded method, the linear shrinkage approximated one third of true volumetric shrink-age by isotropic contraction. However, in bonded disc method, as the bonded surface increased the linear shrinkage increased up to volumetric shrinkage value by anisotropic contraction. The linear shrinkage value increased with increasing C-factor and approximated true volumetric shrinkage and reached plateau at about C-factor 5∼6. The more flow the composite was, reduced linear shrinkage was measured by compensation radial flow.
Keywords
Anisotropy; Polymerization shrinkage; Bonded disc method; Flow; C-factor; Light cured composites;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Penn RW: A recording dilatometer for measuring poly merization shrinkage. Dent Mater 2: 78 79, 1986   DOI   ScienceOn
2 Sakaguchi RL, and Berghe HX : Reduced light energy density decreases post gel contraction while maintaining degree of conversion in composites. J Dent 26;695 700, 1998   DOI   ScienceOn
3 Puckett AD and Smith R : Method to measure the polymerization shrinkage of light cured composites. J Prosthet Dent 68:56 8, 1992   DOI   ScienceOn
4 Venhoven BAM, de Gee AJ and Davidson CL : Polymerization contraction and conversion of light curing BisGMA based methacryate resins. Biomaterials 14(11) :871 875, 1993   DOI   ScienceOn
5 Watts DC and Marouf AS: Optimal specimen geometry in bonded disc shrinkage strain measurements on light cured biomaterials. Dent Mater 16:447 451. 2000   DOI   ScienceOn
6 Opdam NJM, Roeters JJM, Peters TCRB, et al. Consistency of resin composites for posterior use. Dent Mater 1996; 12: 350 354   DOI   ScienceOn
7 Bayne SC, Thompson JY, Swift EJ, et al. A characterization of first generation flowable composites. JADA 1998; 129: 567 577   DOI
8 Feilzer AJ, de Gee AJ and Davidson CL : Setting stress in composite resin in relation to configuration of the restoration. J Dent Res 66:1636 9, 1987   DOI   PUBMED   ScienceOn
9 Watts DC and Al Hindi A : Intrinsic 'soft start' poly merization shrinkage kinetics in a acrylate based resin composite. Dent Mater 15:39 45, 1999
10 Barnes HA, Hutton JF, Walters K : An introduction to rheology, 1st ed. Amsterdam: Elsevier Science Publishing co. 1989
11 Feilzer AJ, de Gee AJ and Davidson CL: Increased wall to wall curing contraction in thin bonded resin layers. J Dent Res 68:48 50, 1989   DOI   PUBMED   ScienceOn
12 Feilzer AJ, de Gee AJ and Davidson CL : Curing contraction of composites and glass ionomer cements. J Prosthet Dent 59:297 300, 1988   DOI   ScienceOn
13 Lee IB, Son HH and Um CM: Rheologic properties of flowable, conventional hybrid and condensable composite resins. Dent Mater 19: 298 307, 2003
14 Rees JS and Jacobsen PH: The polymerization shrinkage of composite resins. Dent Mater 5:41 44, 1989   DOI   ScienceOn
15 Watts DC and Cash AJ: Determination cf polymerization shrinkage kinetics in visible light cured materials : methods development. Dent mater 7:281 287, 1991   DOI   ScienceOn
16 Fano V, Ortalli l, Pizzi Sand Bonanini M : Polymerization shrinkage of microfilled composites determined by laser beam scanning. Biomaterials 18:467 470, 1997   DOI   ScienceOn
17 Lai JH and Johnson AE : Measuring polymerization shrinkage of photo activated restorative materials by a water filled dilatometer. Dent Mater 9:139 143, 1993   DOI   ScienceOn
18 de Gee AJ, Feilzer AJ and Davidson CL ; True linear polymerization shrinkage of unfilled resins and com poaites determined with a Iincmeter. Dent Mater 9:11 14, 1993   DOI   ScienceOn
19 Cook WD, Forrest M and Goodwin AA : A simple method for the measurement of polymerization shrinkage in dental composites. Dent Mater 15:447 449, 1999   DOI   ScienceOn
20 Suh Bl, Feng L, Wang Y, Cripe C, Cincione F and de Rjik W : The effect of the pulse delay cure technique on residual strain in composites. Compendium Vol.20, No.2;4 14, 1999
21 Tyas MJ, Jones DW and Rizkalla AS : The evaluation of resin composite consistency. Dent Mater 14:424 428, 1998   DOI   ScienceOn
22 Labella R, Lambrechts P, van Meerbeek B and Vanherle G : Polymerization shrinkage and elasticity of flowable composites and filled adhesives. Dent Mater 15:128 137, 1999   DOI   ScienceOn
23 Sakaguchi RL, Sasik CT, Bunczak MA and Douglas WH : Strain gauge method for measuring pclymerization contraction of composite restoratives. J Dent 19:312 316, 1991   DOI   ScienceOn
24 Lee IB : A new method ? Real time measurement of the initial dynamic volumetric shrinkage of composite resins during polymerization. Korean Academy of Cons Dent 26:134 140, 2001
25 Silikas N, Eliades G and Watts DC : Light intensity effects on resin composite degree of conversion and shrinkage strain. Dent Mater 16:292 296, 2000   DOI   ScienceOn