resin modified glassionomer cement
DESCRIPTION
Resin Modified Glassionomer cementConference on 16 September 2010TRANSCRIPT
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Glass Ionomer in Contemporary
Restorative Dentistry
By Rooj Rojasawasthien. DDS, MSc.
16 August 2010
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Direct Tooth Colored Material
• Resin composite• Compomer (Polyacid
Modified Resin)• Glass Ionomer• Resin Modified Glass
Ionomer
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Direct Tooth Colored Material
GICGlass Ionomer
Cements
RMGIResin-ModifiedGlass Ionomers
PAMRPolyacid-ModifiedResin (compomer)
IMCRIonomer-Modified
Composite Resins
(fluoride in resin)
CRComposite Resins(glass-containing
Hydrophobic resins)
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Glass Ionomer• Silicate cements ---> Glass
ionomer (Wilson and Kent, 1972)
• Powder + Liquid• Fluoroaluminosilicate glass
+ Polyalkenoic acid• Acid – Base reaction
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Mixing - Shiny, Glossy
Phase I (Ion-leaching phase)Polyacid extracts ions from glass
powder
Setting (3-6 min) - Rigid, Opaque
Phase II (Hydrogel phase)Ion cause formation of polyacid
matrix
Maturation (24 hrs – 1 yrs) More tooth-like color
Phase III (Polysalt gel phase)Silica gel forms and attaches
powder to matrix
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Fully set Glass Ionomer
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Advantages• Less shrinkage than
polymerizing resin• No free monomers, Non-
irritating to pulp• Coefficient of thermal expansion similar to dentin
• High compressive strength
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Advantages
• Adhere chemically to enamel and dentin (hydrophilic)
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Advantage• Fluoride release and
recharge (reservoir effect)
Delbem et al., 2005
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Disadvantages• Poor abrasion resistance• Average esthetic• Technique sensitive• Susceptible to take up
additional waterHygroscopic
expansion• Susceptible to dehydration
Crazing, Cracking
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Disadvantages
Wear rate Tensile strength
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Conventional GI(capsule)
Metal-reinforced GI
Conventional GI(hand mix)
Development of Glass Ionomer
High viscous glass ionomer
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Classification• Self-cure glass ionomer–Conventional glass ionomer • Fuji II lining (GC Co., Japan)• Ketac Fil Plus (3M ESPE, USA)
• Ketac Cem
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Classification• Self-cure glass ionomer–Metal-reinforced glass ionomer• Miracle Mix (GC Co., Japan), Ketac silver (ESPE)
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Classification• Self-cure glass ionomer–High viscous glass ionomer
Fuji IX (GC Co., Japan), Ketac Molar (3M ESPE, USA)
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Development of Glass Ionomer
Conventional GI
Resin Components
4.5 – 6 %
Resin-Modified
GI
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Resin-modified glass ionomer• Hydroxyethyl
methacrylate (HEMA)• Vitrebond, first commercial in 1989
• Acid-Base reaction + Photo-chemical polymerization–Dual-cure–Tri-cure : add autocure resin
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Resin-modified glass ionomer (RMGI)Conventional GI RMGI
Vitrebond, Vitremer
Acid-base and light-polymerization reaction compete with and inhibit one
another (Berzin. et al, 2010)
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Resin-modified glass ionomer (RMGI)• Improve properties
–Set on demand–Fewer desiccation and hydration problems
–Immediate finishing–Better esthetics–Tensile strength, fracture toughness
–Resistance to microleakage
–Bond to resin composite
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Fuji Plus
RMGI products• Luting agent
FujiCem
Rely-X luting cement
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RMGI products• Liner / Base
Fuji lining LC Vitrebond
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RMGI products• Composite bonding agent–Fuji Bond LC
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RMGI products• Restorative buildup
Fuji II LC
Vitremer Ketac Nano
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RMGI - Restorative
GC Fuji II LC
Dentin conditioner
3M Vitremer, Ketac Nano
Primer
10% Polyacrylic acid
- 46% HEMA- 39% Ethyl alcohol- 15% Polyacrylic acid- Photoinitiator
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RMGI - Restorative
Rinse
Do notRinse
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RMGI - Restorative10% Polyacrylic acid37% Phosphoric acid
800x 12,000x
An atlas of glass ionomer cements, 2002
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RMGI - Restorative• For Fuji II LC, 10% polyacrylic acid application is able to create micro-mechanical retention.
(Sidhu, 1999)
• For Vitremer, due to high amounts of HEMA, hydrolitic degradation of Vitremer-dentin bonds might be expected to occur. (Fritz et al., 1996)
• In term of bond durability, sealing ability, Fuji II
LC is better than Vitremer. (Fagundes et al., 2009)
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Clinical using of RMGI – Class V
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Clinical using of RMGI – Class V
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Clinical using of RMGI – Class V
Onal & Pamir, 2005
Two years laterVitremer
Compomer
Composite
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Clinical using of RMGI – Class V
Puemans et al., 2005
3-step etch and rinse
2-step etch and rinse
Glass ionomer
Survival rate
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Clinical using of RMGI – Class V
Puemans et al., 2005
Failure rate
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Clinical using of RMGI – Root caries
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Clinical using of RMGI – Sandwich tech.
The sandwich technique with resin-modified glassionomer cements or compomers can
improve the marginal adaptation of Class II composite restorations with cervical margins located in dentine (Dietrich. et al, 1999)
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Clinical using of RMGI – Sandwich tech.
Liebenberg , 2005
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Clinical using of RMGI – Sandwich tech.
Liebenberg , 2005
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Clinical using of RMGI – Sandwich tech.
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Clinical using of RMGI• Secondary caries
F- release
Remineralization
Reduce secondary caries
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Clinical using of RMGI• Secondary caries
Sidhu , 2010
Under fluoride dentifrice, the RMGI provided additional protection
against secondary caries. (Sousa et al., 2009)
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Conclusion
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Conclusion• Advantages
–Adhere chemically to tooth structure
–Fluoride release–Less shrinkage
• Disadvantages–Lower wear resistance and physical properties compare to composite
–Moisture sensitivity remain–Unstable color
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Thank You