Zusammenfassung der Ressource
FISSURE SEALANTS
- Hard insoluable resin material
- Used in liquid form - flowable resin
- Fills pits and fissures with cutting enamel
- FUNCTIONS
- Eradicate fissures
- Aid cleaning
- Prevents caries
- CLINICAL TECHNIQUE
- Mechanical cleansing, isolate and dry the tooth.
- Etch, rinse, isolate, dry
- Apply resin, polymerise and check occlusion
- EVALUATION
- Smooth and check occ
- No air bubbles
- under/over extensions
- THE ACID ETCH TECHNIQUE
- 30-50% PHOSPHORIC ACID
- approx 8ym enamel dissolved
- creates porosities 50ym deep
- TYPE 1 ETCH PATTERN
- Prism core removed, peripheral material left
- Most common etching pattern
- TYPE 2 ETCH PATTERN
- Prism core remains intact
- peripheral regions removed
- TYPE 3 ETCH PATTERN
- Haphazard effect
- Not related to prism morphology
- SELF POLYMERISED (SELF CURE)
- 2 solutions mixed
- Self setting - limited working time
- ULTRA VIOLET POLYMERISED
- Not so common
- Longer application time
- may cause retinal damage
- WHITE LIGHT POLYMERISED
- Longer application time
- No retinal damage
- COLOURED FS'S
- Clear - to see underneath
- Tinted or Opaque - see loss of sealant
- FILLED OR NON FILLED
- Filled with Lithium alumina silicate
- Increased resistance to abrasion
- Increased wear on opposing teeth
- INDICATIONS FOR USE
- High caries risk, limited manual dexterity
- Medically comprimised - physical probs/age
- Cardiac probs, immunosuppressed
- bleeding disorders, metabolic/endocrine probs
- Tooth can be isolated
- Deep Fissures
- CONTRAINDICATIONS
- Poor pt co operation
- Caries present
- Previously restored tooth
- Should be reviewed 6/12 and take bw's if poss caries