Date post: | 19-Mar-2017 |
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Health & Medicine |
Upload: | yasser-al-wasifi |
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YASSER ALI AL MORTADA AL WASIFIBDS,MSc,PhD,DDS.
Quotedfrom: S.C.Bayne,SchoolofDentistry,UniversityofMichigan,AnnArbor,MI
METHYL METHACRYLATE
BIS - GMA
CHEMICAL ACTIVATED (1) LIGHT ACTIVATED (1)
ACTIVATOR: BenzoylPeroxide UltraViolet(365nm)VisibleLight(460480nm)
INITIATOR: Tertiaryaromaticamine Camphoroquinone
LIGHTABSORBER:
--- Benzoine methyletherforUV.Alphadiketone (aliphaticamine)forVLC.
CHEMICAL ACTIVATED LIGHT ACTIVATED
FORM: Twopastesystem Onepastesystem
MIXING: Mixequalparts~ entrappedairvoids Readilyavailablewithnomixing
WORKING TIME: Limited Flexible
SETTING: StartuponmixingExtendeduntilconsumingall initiatorCommandExtendeduntillightemissionstopped
CONVERSION: Homogenousmaximumcuring Un-homogeneousAffectedbytimeanddepthoflight
CHEMICAL ACTIVATED LIGHT ACTIVATEDCOLOR
REPRODUCTION:Poorqualityofcolorreproduction Highqualityofcolorreproduction
TECHNIQUESENSITIVITY:
Onlylimitedworkingtime Problemswithambientlight
Quotedfrom: S.C.Bayne,SchoolofDentistry,UniversityofMichigan,AnnArbor,MI
COMPOSITE TYPE FILLERDensifiedcomposites: - Midway filled
Ultra-fineFine
60%byvolumeParticles3m
Micro-finecomposites: - HomogeneousAverageparticlesize=0.04m
- HeterogeneousMiscellaneousComposites: Blendsofdensifiedandmicro-finecomposites
TraditionalComposites Equivalenttowhataretermedmacrofillcompositesinotherclassifications
FiberReinforced Composites: Industrial-usecomposites
Quotedfrom: S.C.Bayne,SchoolofDentistry,UniversityofMichigan,AnnArbor,MI
Quotedfrom: https://www.kerrdental.com/kerr-restoratives/premise-universal-nanofilled-composite
Quotedfrom: 3MESPE,Filtek SupremeUltraTechnicalProductProfile
free shrinkage
LOW C-FACTOREffective shrinkage willbe toward the cavitywalls
HIGH C-FACTORBefore Polymerization
HIGH C-FACTORPre-Gel Phase
HIGH C-FACTORPost-Gel Phase
HIGH C-FACTORPost-Gel Phase
HIGH C-FACTORThis resulting in white line at the tooth restoration interface denoting de-bonding
HIGH C-FACTOR
In such a case, to reduce the C-factor:1. Lining with GIC or flowable composite2. Incremental packing in vertical or oblique pattern3. If it is difficult, split the horizontal increment