Are encapsulated anterior glass-ionomer restoratives better than their hand-mixed equivalents?
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Affiliation
Materials Science Unit, Division of Oral Biosciences, Dublin Dental School & Hospital, Trinity College Dublin, Dublin 2, Ireland. adam.dowling@dental.tcd.ieIssue Date
2009-02MeSH
CapsulesChemistry, Pharmaceutical
Compressive Strength
Dental Restoration Wear
Dental Restoration, Permanent
Elastic Modulus
Glass Ionomer Cements
Humans
Imaging, Three-Dimensional
Maleates
Materials Testing
Powders
Solutions
Stress, Mechanical
Surface Properties
Time Factors
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Are encapsulated anterior glass-ionomer restoratives better than their hand-mixed equivalents? 2009, 37 (2):133-40 J DentJournal
Journal of dentistryDOI
10.1016/j.jdent.2008.10.006PubMed ID
19059689Abstract
The performance of encapsulated anterior GI restoratives were compared with their hand-mixed equivalents for the range of powder to liquid mixing ratios routinely encountered clinically. The clinically induced variability of powder to liquid mixing variations of an anhydrous GI restorative formulation was also compared with conventional GI restorative formulations that contained a polyalkenoic acidic liquid.Mean compressive fracture strengths, mean elastic moduli and mean total volumetric wear were determined for the encapsulated anterior GI restoratives mechanically mixed in a Capmix or Rotomix machine and the hand-mixed GI restoratives prepared with powder contents reduced from that recommended by the manufacturer (100%) in 10% increments to 50% for a constant weight of liquid. Multiple comparisons of the group means were made using a one-way analysis of variance (ANOVA) and Tukey's multiple range tests employed at P<0.05.
For the encapsulated GI restoratives, the mean compressive fracture strength, mean elastic modulus and in-vitro wear resistance were significantly increased compared with their hand-mixed equivalents prepared with powder contents below that recommended by the manufacturers. The conventional GI restoratives resulted in a linear deterioration (R2>0.95) of the mean compressive fracture strength and mean elastic modulus with powder content compared with the bi-modal deterioration for the anhydrous GI restorative.
Encapsulated anterior GI restoratives outperform their hand-mixed equivalents for the range of powder to liquid mixing ratios routinely encountered clinically such that they are advocated for use in clinical practice. Anhydrous GI restorative formulations are more susceptible to clinically induced variability on mixing compared with conventional GI restorative formulations that contained a polyalkenoic acidic liquid.
Item Type
ArticleLanguage
enISSN
0300-5712ae974a485f413a2113503eed53cd6c53
10.1016/j.jdent.2008.10.006
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