Stress relaxation of trithiocarbonate-dimethacrylate-based dental composites

被引:30
作者
Park, Hee Young
Kloxin, Christopher J. [2 ,3 ]
Fordney, Mark F.
Bowman, Christopher N. [1 ,4 ]
机构
[1] Univ Colorado, ECCH 111, Dept Chem & Biol Engn, Ctr Engn,CB 424, Boulder, CO 80309 USA
[2] Univ Delaware, Dept Mat Sci & Engn, Newark, DE 19716 USA
[3] Univ Delaware, Dept Chem Engn, Newark, DE 19716 USA
[4] Univ Colorado Denver, Sch Dent, Dept Restorat Dent, Aurora, CO 80045 USA
基金
美国国家科学基金会; 美国国家卫生研究院;
关键词
Restorative material; Low stress; Polymer networks; Trithio carbonate; Addition-fragmentation chain transfer; Photopolymerization; FRAGMENTATION CHAIN TRANSFER; CROSS-LINKED POLYMERS; RADICAL POLYMERIZATION; RESTORATIVE MATERIALS; TRIBLOCK COPOLYMERS; GLASS-TRANSITION; RESIN-COMPOSITES; RAFT AGENTS; PHOTOPOLYMERIZATION; SHRINKAGE;
D O I
10.1016/j.dental.2012.04.016
中图分类号
R78 [口腔科学];
学科分类号
1003 ;
摘要
Objectives. To reduce polymerization-induced shrinkage stress while maintaining mechanical properties, reversible addition-fragmentation chain transfer (RAFT)-capable functional groups were incorporated into a photopolymerizable dimethacrylate-based dental composite. We hypothesize that the incorporation of trithiocarbonate-based RAFT functional groups into conventional dimethacrylate dental resins will reduce polymerization stress. Methods. A trithiocarbonate dimethacrylate (TTCDMA) monomer, capable of undergoing radical-mediated RAFT, is mixed with 70 wt% BisGMA (bisphenylglycidyl dimethacrylate) and compared to a conventional dental resin comprised of TEGDMA (triethylene glycol dimethacrylate) and 70 wt% BisGMA. The shrinkage stress and methacrylate conversion were simultaneously measured during polymerization. The fracture toughness and elastic modulus were measured to evaluate the effect of the TTCDMA monomer on the mechanical properties. All the materials used herein were evaluated as a composite, including 75 wt% silica fillers. ANOVA (CI 95%) was conducted to assess the differences between the means. Results. The TTCDMA composite exhibited a 65% stress reduction compared with TEGDMA-BisGMA though the reaction rate was slower than the conventional dental composite, owing to the additional RAFT reaction. The fracture toughness and elastic modulus of the TTCDMA-based composite were not significantly different than in the TEGDMA-based composite, while the T-g was decreased by 30 degrees C to 155 +/- 2 degrees C. Significance. Despite only replacing the reactive-diluent, significant and dramatic stress reduction was observed while maintaining the elastic modulus and fracture toughness. This new RAFT-capable monomer shows great promise to replace the reactive diluent in BisGMA-based dental materials. Formulation optimization and further exploration of other RAFT-capable functional groups will provide further stress reduction in dental materials. (C) 2012 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:888 / 893
页数:6
相关论文
共 25 条
  • [1] Burke FJT, 1999, QUINTESSENCE INT, V30, P234
  • [2] Thiol-ene oligomers as dental restorative materials
    Carioscia, JA
    Lu, H
    Stanbury, JW
    Bowman, CN
    [J]. DENTAL MATERIALS, 2005, 21 (12) : 1137 - 1143
  • [3] Synthesis, Thiol-Yne "Click" Photopolymerization, and Physical Properties of Networks Derived from Novel Multifunctional Alkynes
    Chan, Justin W.
    Shin, Jungwhan
    Hoyle, Charles E.
    Bowman, Christopher N.
    Lowe, Andrew B.
    [J]. MACROMOLECULES, 2010, 43 (11) : 4937 - 4942
  • [4] Recent Advances and Developments in Composite Dental Restorative Materials
    Cramer, N. B.
    Stansbury, J. W.
    Bowman, C. N.
    [J]. JOURNAL OF DENTAL RESEARCH, 2011, 90 (04) : 402 - 416
  • [5] Volume contraction in photocured dental resins: The shrinkage-conversion relationship revisited
    Dewaele, M
    Truffier-Boutry, D
    Devaux, J
    Leloup, G
    [J]. DENTAL MATERIALS, 2006, 22 (04) : 359 - 365
  • [6] Thiol-Yne Photopolymerizations: Novel Mechanism, Kinetics, and Step-Growth Formation of Highly Cross-Linked Networks
    Fairbanks, Benjamin D.
    Scott, Timothy F.
    Kloxin, Christopher J.
    Anseth, Kristi S.
    Bowman, Christopher N.
    [J]. MACROMOLECULES, 2009, 42 (01) : 211 - 217
  • [7] Ferrillo RG, 1997, J APPL POLYM SCI, V64, P191, DOI 10.1002/(SICI)1097-4628(19970404)64:1<191::AID-APP17>3.0.CO
  • [8] 2-7
  • [9] A mechanistic and kinetic study of the photoinitiated cationic double ring-opening polymerization of 2-methylene-7-phenyl-1,4,6,9-tetraoxa-spiro[4.4]nonane
    Ge, Junhao
    Trujillo-Lemon, Marianela
    Stansbury, Jeffrey W.
    [J]. MACROMOLECULES, 2006, 39 (26) : 8968 - 8976
  • [10] Polymerization shrinkage and contraction stress of dental resin composites
    Kleverlaan, CJ
    Feilzer, AJ
    [J]. DENTAL MATERIALS, 2005, 21 (12) : 1150 - 1157