301486
COMPOSITE RESIN
- resin matrix, filler, silane coupling agent
- Non adhesive material - requires bonding agent
- Hydrophobic, photophillic
- polymerisation shrinkage
- place in small increments - only cures at 2mm
- pts can be hypersenitive to products
- pts can be hypersenitive to products
- ADVANTAGES
- Wear and compressive resistance matches tooth substance
- command set - light cure
- good aesthetics
- more conservative of tooth tissue
- Wear and compressive resistance matches tooth substance
- DISADVANTAGES
- polymerisation shrinkage
- moisture control essential
- technique of placement
- 2mm increments - time consuming
- 2mm increments - time consuming
- polymerisation shrinkage
- TECHNIQUES TO OVERCOME POLYMERISATION
- keep field as dry as poss - will shrink away from water
- ramped output from light source
- place in oblique increments
- direct light to gingival floor
- keep field as dry as poss - will shrink away from water
- CLINICAL INDICATIONS
- Anterior - classIII, IV, V
- Posterior - Class I, II, V
- Deciduous restorations
- Anterior - classIII, IV, V
- ANTERIOR - outline form, access from palatal/lingual aspect
- keep prep as min as possible - use small round bur
- Remove caries from ADJ and as much stained dentine - better aesthetics
- Bevel enamel edges for larger surface area of bonding
- Apply comp in increments using clear matrix and cure for 30secs
- keep prep as min as possible - use small round bur
- CLINICAL HANDLING OF COMP IN ANT TEETH
- Best aesthetic result when final increment is placed
- placed under clear matrix removes oxygen layer
- Best aesthetic result when final increment is placed
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