advanced composite techniques Flashcards
When isolating teeth during composite restorations, what is the tooth being isolated from?
- saliva
- blood
- gingival crevicular fluid
- moisture in breath
- oropharynx protection
Which methods can be used for relative isolation?
- cotton wool
- split dam
- optra fate
- isovac
- dry guard
Name the 4 types of dental dam clamps.
- Haller Clamps (arms which extend beyond the clamp)
- Tiger Clamps (serrated edges)
- Brinker Clamps (anterior, provide retraction)
- Soft Clamps (flexible)
What can be used to manage gingival crevicular fluid / gingival bleeding?
- Ferric Sulphate (15.5%)
- Aluminium Chloride (15%)
- Electrocautery Machine
- LA - vasoconstrictor controls gingival bleeding.
What is air abrasion?
Small hand piece which fits onto the slow speed unit.
Does air abrasion remove the need for etching of the enamel?
No - use as well as.
Why might air abrasion be used?
As some studies suggest it increases bond strength.
Which structural component of teeth gives it its colour?
The underlying dentine modulated by the overlying enamel.
Typically, what are the properties of young enamel?
- White Tint
- High Opalescence
- Less Translucency
Typically, what are the properties of adult enamel?
- Neutral Tint
- Less Opalescence
- Intermediate Translucency
Typically, what are the properties of old enamel?
- Yellow Tint
- Higher Translucency
Define hue.
A change in colour.
Define value.
Lightness from black to white.
Define chroma.
Strength of colour (colour purity).
Describe the spatial relationship between enamel and dentine over time.
The amount of enamel covering the incisal edge reduces and dentine is progressively exposed.
What is the hybrid layer which allows for the adherence of composite to tooth?
A mix of collagen and resin achieved when the adhesive penetrates into the collagen network.
What does etching the tooth surface do?
Removes the superficial mineralised component of teeth and reveals collagen fibres.
Describe the effect a wet surface will have on the action of the adhesive.
The adhesive would not penetrate the collagen network so the hybrid layer would not form.
Describe the impact on an over dried surface on the action of the adhesive.
The collagen fibres collapse so no hybrid layer is formed.
What benefits do the Spectra ST range have on the quality of the restoration?
Provide a more dentine enamel appearance - wider range of shades covered in fewer options.
Describe the layering technique.
A more opaque shade should be used for where there is dentine, an intermediate shade for the transition and then an enamel shade for where enamel would be present.
Which banded burs should be used for finishing the restoration?
Yellow and red.
What is the suggested protocol for finishing and polishing a composite restoration?
- Check occlusion and ledges.
- Incisal edge, embrasures, proximal surface.
- Labial surface - medium, fine, superfine sof-lex
- enhance
- beige polishing wheel
- white polishing wheel - Palatal Surface
What is the compound impregnated into enhance burs?
Aluminium Oxide
