COMPOSITE RESIN

Classification of Composite Resin

ACCORDING TO : FILLER PARTICLES

OTHER TYPES OF COMPOSITES

Macrofillers – 10 to 100 um- 75% to 80% filler by weight. Microfillers- 0.01 to 0.04 um fine finishing- 35%-60% filler by wt. Hybrid-0.4-1 um-75%-85% filler by weight. Nanofillers- 0.005 to 0.01 um very fine finishing, good physical properties Nanohybrids - presented inferior properties similar or slightly better properties Midifillers- 1- to 10 um fine Minifillers- 0.1 to 1um very fine

Packable composites - have increased viscosity for: - Easier restoration of proximal contact - Similar to handling property of amalgam Flowable Composites- have lower filler content, lower wear resistance and lower strength. Exhibits higher polymerization shrinkage. Used for pfs, small class I or as base under filled composites

POLYMERIZATION METHOD

Self-cured, chemically cured, or two-component system: Amine accelerators Ultra-violet - light cured Visible - light cured: Camphorquinone photoinitiator Dual-cured Staged-curing –(filtered light)

Types of Polymer Matrix:

Bis-GMA- bisphenol-A glycidyl dimethacrylate and

UDMA- urethane dimethacrylate most commonly used polymer matrix

Silorane - newer type, less shrinkage

Types of Light Curing Units:

• Quartz-tunsten-halogen (QTH)
• Plasma arc
• Laser
• Light-emitting diode (LED)

Clinical Considerations:

Wear - small- to medium-width restoration can be repaired by rebonding a new surface onto old composite Marginal integrity : Butt-joint margins Postoperative Sensitivity: Marginal diffusion of species that induce fluid flow within dentin Dimensional changes of restoration Biocompatibility: Unpolymerized materials are potentially cytotoxic

Color matching: Dry teeth appear lighter and whiter Chemical change in matrix Dentin darkens with age Bleaching Interfacial Staining - Proper etching and bonding Secondary caries - Degree of technical excellence during composite placement

BONGAYAN, VIAH SHAMAE A. DMD2AA