Conversion, shrinkage, water sorption, flexural strength and modulus of re-mineralizing dental composites

被引:64
作者
Aljabo, A. [1 ]
Xia, W. [1 ]
Liaqat, S. [1 ]
Khan, M. A. [1 ]
Knowles, J. C. [1 ]
Ashley, P. [2 ]
Young, A. M. [1 ]
机构
[1] UCL Eastman Dent Inst, Div Biomat & Tissue Engn, London WC1X 8LD, England
[2] UCL Eastman Dent Inst, Dept Paediat Dent, London WC1X 8LD, England
基金
英国工程与自然科学研究理事会; 美国国家卫生研究院;
关键词
Dental composite; Mono and tri calcium phosphate; Antibacterial; Hydroxyapatite; Tooth remineralization; FTIR; Conversion depth; Shrinkage and expansion; Strength; Modulus; AMORPHOUS CALCIUM-PHOSPHATE; RESIN COMPOSITES; MECHANICAL-PROPERTIES; BIS-GMA; CHLORHEXIDINE; STRESS; ANTIBACTERIAL; SOLUBILITY; MONOMERS; AMALGAM;
D O I
10.1016/j.dental.2015.08.149
中图分类号
R78 [口腔科学];
学科分类号
1003 ;
摘要
Objectives. Cure, volumetric changes and mechanical properties were assessed for new dental composites containing chlorhexidine (CHX) and reactive calcium phosphate-containing (CaP) to reduce recurrent caries. Methods. 20 wt.% of light curable urethane dimethacrylate based liquid was mixed with 80 wt.% glass filler containing 10 wt.% CHX and 0-40 wt.% CaP. Conversion versus depth with 20 or 40 s light exposure was assessed by FTIR. Solidification depth and polymerization shrinkage were determined using ISO 4049 and 17304, respectively. Subsequent volume expansion and biaxial flexural strength and modulus change upon water immersion were determined over 4 weeks. Hydroxyapatite precipitation in simulated body fluid was assessed at 1 week. Results. Conversion decreased linearly with both depth and CaP content. Average solidification depths were 4.5, 3.9, 3.3, 2.9 and 5.0 with 0, 10, 20, and 40% CaP and a commercial composite, Z250, respectively. Conversions at these depths were 53 +/- 2% for experimental materials but with Z250 only 32%. With Z250 more than 50% conversion was achieved only below 1.1 mm. Shrinkage was 3% and 2.5% for experimental materials and Z250, respectively. Early water sorption increased linearly, whilst strength and modulus decreased exponentially to final values when plotted versus square root of time. Maximum volumetric expansion increased linearly with CaP rise and balanced shrinkage at 10-20 wt.% CaP. Strength and modulus for Z250 decreased from 191 to 158 MPa and 3.2 to 2.5 GPa. Experimental composites initial strength and modulus decreased linearly from 169 to 139 MPa and 5.8 to 3.8 GPa with increasing CaP. Extrapolated final values decreased from 156 to 84 MPa and 4.1 to 1.7 GPa. All materials containing CaP promoted hydroxyapatite precipitation. Significance. The lower surface of composite restorations should both be solid and have greater than 50% conversion. The results, therefore, suggest the experimental composite may be placed in much thicker layers than Z250 and have reduced unbounded cytotoxic monomer. Experimental materials with 10-20 wt.% additionally have volumetric expansion to compensate shrinkage, antibacterial and re-mineralizing components and competitive mechanical properties. (C) 2015 The Authors. Published by Elsevier Ltd.
引用
收藏
页码:1279 / 1289
页数:11
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