Question 216 · LDEK · Fixed appliances
Indicate false statements regarding the bonding of orthodontic brackets:
- A. in patients subjected to bleaching, lower bonding strength to the bleached enamel may occur.
- B. chemical adhesion and coating the base of the bracket with silane agent is not recommended, as it increases the bonding force of the bracket to the tooth tissue.
- C. the bonding strength of fixed appliance elements to the smooth surface of porcelain restoration is very small.
- D. etching the porcelain surface with 37% phosphoric acid and silanization is recommended in order to increase the bonding strength.
- E. newly made composite restorations do not require silanization in order to increase the bonding strength.
Hint
Ask which acid can actually etch glass ceramics and what phosphoric acid does to a porcelain surface.
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