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MECHANICAL PROPERTIES OF A NEW ZINC-REINFORCED GLASS IONOMER RESTORATIVE MATERIAL

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Title: MECHANICAL PROPERTIES OF A NEW ZINC-REINFORCED GLASS IONOMER RESTORATIVE MATERIAL
Author: Al-Angari, Sarah Sultan, 1983-
Advisor: Cook, Norman Blaine,1954- Research Committee Chair
Lund, Melvin R., 1922
Cochran, Michael A. (Michael Alan), 1944-
Chu, Tien-Min Gabriel
Platt, Jeffrey A., 1958-
Hara, Anderson T.
Degree: M.S.D.
Degree Year: 2012
Department: School of Dentistry
Grantor: Indiana University
Permanent Link: http://hdl.handle.net/1805/3091
Abstract: Objective: Zinc-reinforced glass ionomer restorative material (ZRGIC) has been proposed as an improved restorative material. The study compared the mechanical properties of a ZRGIC restorative material (ChemFil Rock, (Dentsply)), with three commercially available glass ionomers (GICs); Fuji IX GP Extra (GC America), Ketac Molar (3M ESPE) and EQUIA Fil (GC America). A resin composite, Premise (Kerr), was included as a control group except for fracture toughness. Methods: Fracture toughness (KIC) testing was done according to ISO 13586, using single edge notched-beam specimens (n=10), loaded until failure in a three-point bending test device. Specimens (n=9) for the hardness, roughness and abrasive wear testing were made by mixing and inserting the restorative materials into individual stainless steel molds followed by flattening and polishing. Knoop microhardness (KHN) was performed (25 g, 30 s),on pre-determined areas of the polished surfaces. For toothbrushing wear resistance and roughness, specimens were brushed in an automated brushing machine (200 g) with a suspension of dentifrice and water (1:1, w/v) for 20,000 strokes. Specimen surfaces were scanned in an optical profilometer before and after brushing to obtain surface roughness (Ra) and mean height (surface) loss using image subtraction and dedicated software. Data were analyzed using Wilcoxon Rank Sum tests (α=0.05). Results: ChemFil Rock had the highest change in surface roughness (Ra)(0.79±0.14; p<0.001) and the lowest microhardness (KHN) values (52.39±2.67; p<0.05) among all GICs. Its wear resistance was comparable to other GICs (p>0.05). ChemFil Rock had lower fracture toughness (0.99±0.07, KIC) compared to Equia Fil (p<0.01) and higher compared to the other GICs (p<0.01). Conclusion: The new ZRGIC restorative material showed intermediate fracture toughness, high change in surface roughness, and low microhardness compared to three other commercial GICs. All materials were supplied by respective manufacturers.
Keywords: GIC
Fracture
Toughness
Wear
Roughness
Knoop
MeSH Subjects: Dental Restoration Wear
Glass Ionomer Cement
Surface Properties
Hardness
Tooth Abrasion
Date: 2012-11-25
Description: Indiana University-Purdue University Indianapolis (IUPUI)
Appears in Collections: Dentistry School Theses and Dissertations


 

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