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  1. Article: Degradation, fatigue, and failure of resin dental composite materials.

    Drummond, J L

    Journal of dental research

    2008  Volume 87, Issue 8, Page(s) 710–719

    Abstract: ... specimens. The main cause of failure, for most dental resin composites, is the breakdown of the resin matrix ... of particle- or fiber-filler-containing indirect dental resin composite materials. The focus will be ... and/or the interface between the filler and the resin matrix. In clinical studies, it appears ...

    Abstract The intent of this article is to review the numerous factors that affect the mechanical properties of particle- or fiber-filler-containing indirect dental resin composite materials. The focus will be on the effects of degradation due to aging in different media, mainly water and water and ethanol, cyclic loading, and mixed-mode loading on flexure strength and fracture toughness. Several selected papers will be examined in detail with respect to mixed and cyclic loading, and 3D tomography with multi-axial compression specimens. The main cause of failure, for most dental resin composites, is the breakdown of the resin matrix and/or the interface between the filler and the resin matrix. In clinical studies, it appears that failure in the first 5 years is a restoration issue (technique or material selection); after that time period, failure most often results from secondary decay.
    MeSH term(s) Composite Resins/chemistry ; Dental Bonding ; Dental Restoration Failure ; Dental Restoration, Permanent ; Dental Stress Analysis ; Humans ; Stress, Mechanical ; Surface Properties ; Weight-Bearing
    Chemical Substances Composite Resins
    Language English
    Publishing date 2008-07-23
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, Non-P.H.S. ; Review
    ZDB-ID 80207-4
    ISSN 1544-0591 ; 0022-0345
    ISSN (online) 1544-0591
    ISSN 0022-0345
    DOI 10.1177/154405910808700802
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Degradation in the fatigue strength of dentin by cutting, etching and adhesive bonding.

    Lee, H H / Majd, H / Orrego, S / Majd, B / Romberg, E / Mutluay, M M / Arola, D

    Dental materials : official publication of the Academy of Dental Materials

    2014  Volume 30, Issue 9, Page(s) 1061–1072

    Abstract: ... resin composite restorations significantly decrease the fatigue strength of dentin, and application ... Unlabelled: The processes involved in placing resin composite restorations may degrade the fatigue ... preparation, etching and resin bonding procedures using a 3-step system.: Methods: Specimens of dentin were ...

    Abstract Unlabelled: The processes involved in placing resin composite restorations may degrade the fatigue strength of dentin and increase the likelihood of fractures in restored teeth.
    Objective: The objective of this study was to evaluate the relative changes in strength and fatigue behavior of dentin caused by bur preparation, etching and resin bonding procedures using a 3-step system.
    Methods: Specimens of dentin were prepared from the crowns of unrestored 3rd molars and subjected to either quasi-static or cyclic flexural loading to failure. Four treated groups were prepared including dentin beams subjected to a bur treatment only with a conventional straight-sided bur, or etching treatment only. An additional treated group received both bur and etching treatments, and the last was treated by bur treatment and etching, followed by application of a commercial resin adhesive. The control group consisted of "as sectioned" dentin specimens.
    Results: Under quasi-static loading to failure there was no significant difference between the strength of the control group and treated groups. Dentin beams receiving only etching or bur cutting treatments exhibited fatigue strengths that were significantly lower (p≤0.0001) than the control; there was no significant difference in the fatigue resistance of these two groups. Similarly, the dentin receiving bur and etching treatments exhibited significantly lower (p≤0.0001) fatigue strength than that of the control, regardless of whether an adhesive was applied.
    Significance: The individual steps involved in the placement of bonded resin composite restorations significantly decrease the fatigue strength of dentin, and application of a bonding agent does not increase the fatigue strength of dentin.
    MeSH term(s) Acid Etching, Dental ; Dental Bonding ; Dental Stress Analysis ; Dentin ; Humans ; In Vitro Techniques
    Language English
    Publishing date 2014-06-28
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 605995-8
    ISSN 1879-0097 ; 0109-5641
    ISSN (online) 1879-0097
    ISSN 0109-5641
    DOI 10.1016/j.dental.2014.06.005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Degradation of microfilled posterior composite.

    Mazer, R B / Leinfelder, K F / Russell, C M

    Dental materials : official publication of the Academy of Dental Materials

    1992  Volume 8, Issue 3, Page(s) 185–189

    Abstract: ... probably due to tensile fatigue failure. ... of these materials are their susceptibility to wear, marginal leakage, and recurrent caries. Numerous studies have ... of failure, particularly those containing submicron-sized fillers. The purpose of this study, therefore, was ...

    Abstract The substantial improvement in the chemical, physical and mechanical characteristics of posterior composites has contributed to their increased use in recent years. However, some troubling characteristics of these materials are their susceptibility to wear, marginal leakage, and recurrent caries. Numerous studies have dealt with the wear resistance of posterior composites. Only a few have investigated the mechanisms of failure, particularly those containing submicron-sized fillers. The purpose of this study, therefore, was to analyze the clinical characteristics of a posterior composite to determine the mechanisms responsible for marginal degradation. Using a series of optical standards, it was determined that the generalized wear-rate was linear, averaging 8 microns/year. Furthermore, it was shown that the marginal defect was cohesive in nature and that this type of defect, which is inherent in submicron-type posterior composites, was probably due to tensile fatigue failure.
    MeSH term(s) Acrylic Resins ; Adolescent ; Adult ; Composite Resins ; Dental Restoration, Permanent ; Humans ; Molar ; Particle Size ; Polyurethanes ; Prosthesis Failure ; Surface Properties ; Tensile Strength
    Chemical Substances Acrylic Resins ; Composite Dental Resin ; Composite Resins ; Polyurethanes
    Language English
    Publishing date 1992-05
    Publishing country England
    Document type Comparative Study ; Journal Article
    ZDB-ID 605995-8
    ISSN 1879-0097 ; 0109-5641
    ISSN (online) 1879-0097
    ISSN 0109-5641
    DOI 10.1016/0109-5641(92)90080-v
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  4. Article: Resistance to degradation of resin-dentin bonds using a one-step HEMA-free adhesive.

    Monticelli, Francesca / Osorio, Raquel / Pisani-Proença, Jatyr / Toledano, Manuel

    Journal of dentistry

    2007  Volume 35, Issue 2, Page(s) 181–186

    Abstract: Objective: To evaluate the resistance to degradation of resin-dentin bonds formed with a one-step ... of the recorded failures were adhesive and located at the top of the hybrid layer. A poorly infiltrated hybrid ... with G Bond under dry and wet conditions. The bonded teeth were subjected to fatigue loading (90 or 250 N ...

    Abstract Objective: To evaluate the resistance to degradation of resin-dentin bonds formed with a one-step acetone-containing and HEMA-free adhesive.
    Methods: Flat, mid-coronal dentin surfaces were bonded with G Bond under dry and wet conditions. The bonded teeth were subjected to fatigue loading (90 or 250 N) using 5000 or 50000 cycles (at 3.0 Hz) and to chemical degradation (10% NaOCl immersion for 5 h). Specimens were sectioned into beams and tested for microtensile bond strength. Fractographic analysis was performed by scanning electron microscopy (SEM). Additional specimens were processed for morphological examination of the interfaces.
    Results: Bond strength significantly decreased after the chemical challenge (p<0.05), but not after load cycling. Dentinal moisture did not affect bond strength. Most of the recorded failures were adhesive and located at the top of the hybrid layer. A poorly infiltrated hybrid layer with bubbles entrapped within the adhesive was observed in all groups.
    Conclusions: A discrepancy between water/solvent evaporation rate and convective and evaporative water fluxes from the underlying dentin may be responsible of the droplet formation within the adhesive layer, thus reducing bond strength. A "stress relieving" effect may occur during loading. A loss of bonding effectiveness is expected overtime, mainly due to chemical degradation of the hybrid layer.
    MeSH term(s) Acetone/chemistry ; Adhesiveness ; Composite Resins/chemistry ; Dental Bonding ; Dentin/ultrastructure ; Dentin-Bonding Agents/chemistry ; Desiccation ; Humans ; Materials Testing ; Methacrylates/chemistry ; Microscopy, Electron, Scanning ; Oxidants/chemistry ; Sodium Hypochlorite/chemistry ; Solvents/chemistry ; Stress, Mechanical ; Surface Properties ; Tensile Strength ; Water/chemistry
    Chemical Substances Composite Resins ; Dentin-Bonding Agents ; G-Bond ; Methacrylates ; Oxidants ; Solvents ; Water (059QF0KO0R) ; Acetone (1364PS73AF) ; Sodium Hypochlorite (DY38VHM5OD)
    Language English
    Publishing date 2007-02
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 186068-9
    ISSN 1879-176X ; 0300-5712
    ISSN (online) 1879-176X
    ISSN 0300-5712
    DOI 10.1016/j.jdent.2006.07.005
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