Are encapsulated anterior glass-ionomer restoratives better than their hand-mixed equivalents?
AffiliationMaterials Science Unit, Division of Oral Biosciences, Dublin Dental School & Hospital, Trinity College Dublin, Dublin 2, Ireland. firstname.lastname@example.org
Dental Restoration Wear
Dental Restoration, Permanent
Glass Ionomer Cements
MetadataShow full item record
CitationAre encapsulated anterior glass-ionomer restoratives better than their hand-mixed equivalents? 2009, 37 (2):133-40 J Dent
JournalJournal of dentistry
AbstractThe 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.
- Is encapsulation of posterior glass-ionomer restoratives the solution to clinically induced variability introduced on mixing?
- Authors: Dowling AH, Fleming GJ
- Issue date: 2008 Jul
- An assessment of encapsulated versus hand-mixed glass ionomer restoratives.
- Authors: Fleming GJ, Zala DM
- Issue date: 2003 Mar-Apr
- The optimisation of the initial viscosity of an encapsulated glass-ionomer restorative following different mechanical mixing regimes.
- Authors: Fleming GJ, Kenny SM, Barralet JE
- Issue date: 2006 Feb
- A discriminatory mechanical testing performance indicator protocol for hand-mixed glass-ionomer restoratives.
- Authors: Baig MS, Dowling AH, Cao X, Fleming GJ
- Issue date: 2015 Mar
- Fracture toughness testing: A discriminatory mechanical testing performance indicator for glass-ionomer restoratives?
- Authors: Baig MS, Lloyd CH, Fleming GJ
- Issue date: 2015 Aug