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

Hdl Handle:
http://hdl.handle.net/10147/124286
Title:
Effect of pre-heating on the viscosity and microhardness of a resin composite.
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.
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
Issue Date:
Apr-2010
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
MeSH:
Composite Resins; Dental Bonding; Dental Restoration, Permanent; Dental Stress Analysis; Hardness; Hot Temperature; Humans; Viscosity
ISSN:
1365-2842

Full metadata record

DC FieldValue Language
dc.contributor.authorLucey, Sen
dc.contributor.authorLynch, C Den
dc.contributor.authorRay, N Jen
dc.contributor.authorBurke, F Men
dc.contributor.authorHannigan, Aen
dc.date.accessioned2011-03-11T14:38:21Z-
dc.date.available2011-03-11T14:38:21Z-
dc.date.issued2010-04-
dc.identifier.citationEffect of pre-heating on the viscosity and microhardness of a resin composite. 2010, 37 (4):278-82 J Oral Rehabilen
dc.identifier.issn1365-2842-
dc.identifier.pmid20050987-
dc.identifier.doi10.1111/j.1365-2842.2009.02045.x-
dc.identifier.urihttp://hdl.handle.net/10147/124286-
dc.description.abstractThe 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.-
dc.language.isoenen
dc.subject.meshComposite Resins-
dc.subject.meshDental Bonding-
dc.subject.meshDental Restoration, Permanent-
dc.subject.meshDental Stress Analysis-
dc.subject.meshHardness-
dc.subject.meshHot Temperature-
dc.subject.meshHumans-
dc.subject.meshViscosity-
dc.titleEffect of pre-heating on the viscosity and microhardness of a resin composite.en
dc.typeArticleen
dc.contributor.departmentRestorative Dentistry, University Dental School and Hospital, Wilton, Cork, Ireland.en
dc.identifier.journalJournal of oral rehabilitationen
dc.description.provinceMunster-

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