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    Effect of pre-heating on the viscosity and microhardness of a resin composite.

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    Authors
    Lucey, S
    Lynch, C D
    Ray, N J
    Burke, F M
    Hannigan, A
    Affiliation
    Restorative Dentistry, University Dental School and Hospital, Wilton, Cork, Ireland.
    Issue Date
    2010-04
    MeSH
    Composite Resins
    Dental Bonding
    Dental Restoration, Permanent
    Dental Stress Analysis
    Hardness
    Hot Temperature
    Humans
    Viscosity
    
    Metadata
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    Citation
    Effect of pre-heating on the viscosity and microhardness of a resin composite. 2010, 37 (4):278-82 J Oral Rehabil
    Journal
    Journal of oral rehabilitation
    URI
    http://hdl.handle.net/10147/124286
    DOI
    10.1111/j.1365-2842.2009.02045.x
    PubMed ID
    20050987
    Abstract
    The effect of pre-heating resin composite on pre-cured viscosity and post-cured surface hardness was evaluated. Groups of uncured specimens were heated to 60 degrees C and compared with control groups (24 degrees C) with respect to viscosity and surface hardness. Mean (SD) viscosities of the pre-heated specimens (n = 15) were in the range of 285 (13)-377 (11) (Pa) compared with 642 (35)-800 (23) (Pa) at ambient temperature. There was a statistically significant difference between the two groups (P < 0.001). Mean (SD) Vickers microhardness (VHN) of the pre-heated group (n = 15) was 68.6 (2.3) for the top surface and 68.7 (1.8) for the bottom surface measured at 24 h post curing (specimen thickness = 1.5 mm). The corresponding values for the room temperature group were 60.6 (1.4) and 59.0 (3.5). There was a statistically significant difference between corresponding measurements taken at the top and bottom for the pre-heated and room temperature groups (P < 0.001). There was no significant difference between top and bottom measurements within each group. Pre-heating resin composite reduces its pre-cured viscosity and enhances its subsequent surface hardness. These effects may translate as easier placement together with an increased degree of polymerization and depth-of-cure.
    Item Type
    Article
    Language
    en
    ISSN
    1365-2842
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1365-2842.2009.02045.x
    Scopus Count
    Collections
    Cork University Dental Hospital

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