Results 211 to 220 of about 18,433 (253)
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Resin cure determination by polymerization shrinkage
Dental Materials, 1995This study was designed to develop a methodology that would measure the monomer conversion of dental restorative resins without the use of an infrared spectrometer.Specimens were prepared from heat-cured TEGDMA/MMA copolymers consisting of 0, 20, 40, 50, 80, and 100 mol% TEGDMA. The pre- and post-cure volumes of bar-shaped specimens (45 X 7 X 1 mm) and
F, Rueggeberg, K, Tamareselvy
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Polymerization Shrinkage Stress
2017Significant or not, polymerization shrinkage stress deserves a special chapter when resin composites are discussed. Subject of numerous publications based on in vitro tests and of intensive debates, the real significance of this phenomenon has been challenged by recently published clinical findings.
Luis Felipe Schneider, Rafael R. Moraes
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Polymerization Shrinkage Influences Microtensile Bond Strength
Journal of Dental Research, 2007Shrinkage results from a complex spatial strain network, producing movements within materials. The purpose of this study was to test whether microtensile bond strength (μTBS) of a light-curing resin composite to enamel depends on distance to the center of the curing mass. Labial surfaces of bovine incisors were ground flat, divided into 2 groups (n = 8)
E, Cabrera, J C, de la Macorra
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Polymerization shrinkage of index and pattern acrylic resins
The Journal of Prosthetic Dentistry, 1990Inadequate dimensional stability caused by polymerization shrinkage has been reported concerning the various applications of acrylic resins. The objective of the study was to evaluate dimensional changes of two self-curing acrylic resins marketed as pattern and index material.
Mojon P +3 more
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Vertical and horizontal polymerization shrinkage in composite restorations
Dental Materials, 2014Polymerization shrinkage developed in vertical and horizontal directions after light activation of light-curing composite restorative materials. The purpose of this study was to examine the effects of vertical and horizontal polymerization shrinkage on: (a) dimensional changes of resin composites in tooth cavities; (b) shear bond strengths to enamel ...
Masao, Irie +3 more
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Clinical significance of polymerization shrinkage of composite resins
The Journal of Prosthetic Dentistry, 1982The volumetric polymerization shrinkage of some composite resin restorative materials was measured with a modified dilatometer. It is emphasized that only the shrinkage from the start of the gelation, the rigid contraction of the material, is of clinical relevance. The amount of gelation was determined with an instrument that indicates the first moment
J R, Bausch +4 more
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Polymerization shrinkage kinetics of dimethacrylate resin-cements
Dental Materials, 2009To determine polymerization shrinkage-strain (S(Y)) and shrinkage-stress (S(Z)) of six resin-cements and to compare their performance with the aid of degree of conversion (DC) data.Variolink 2 (VL2), Multilink Automix (MA), Multilink Sprint (MS, all Ivoclar-Vivadent), Nexus 2 (NX2), Maxcem (MX, both Kerr) and RelyX Unicem (RX, 3M-Espe) were ...
Spinell, Thomas +2 more
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[The polymerization shrinkage of composites].
Zahn-, Mund-, und Kieferheilkunde mit Zentralblatt, 1990The absolute values of polymerization shrinkage and its time-dependent course were measured for commercially available composite resins and for composite still under development using a new method measuring the linear shrinkage. The influences of the amounts and of the recipes of the reactive monomer were determined.
U, Matschinske, A, Tappe, B, Sandner
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Polymerization shrinkage and contraction stress of dental resin composites
Dental Materials, 2005The aim of this study was to evaluate the shrinkage, contraction stress, tensile modulus, and the flow factor of 17 commercially available dental resin composites.The volumetric shrinkage measurements were performed by mercury dilatometry, and the contraction stress and tensile modulus were determined by means of stress-strain analysis. The statistical
Kleverlaan, C.J., Feilzer, A.J.
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Polymerization shrinkage of resin‐based restorative materials
Australian Dental Journal, 1983Abstract— The polymerization shrinkage of a range of chemical and photopolymerized resin‐based restorative materials available in Australia was investigated using a previously reported volumetric shrinkage measuring method.The method proved easy to use, reproducible, independent of specimen size, and capable of use in both chemically and photo ...
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