GC EUROPE G-aenial Bond - Manual (Page 4)

4 G-ænial Bond Technical Manual
1.0 introduction
the increased popularity of aesthetic dentistry in the last 50 years has driven the need for durable
aesthetic restorative materials that provide ease-of-use, give confidence in clinical outcomes and
result in patient satisfaction. the advent of adhesive dentistry has made possible the creation of
beautiful direct aesthetic restorations using a conservative approach. to improve application
techniques and the longevity of adhesive restorations, considerable focus has been placed on
developing new bonding systems that support adhesion of the restorative materials to the
remaining tooth structure.
two major categories of adhesive systems are currently available (table 1):
• Etch-and-rinse systems: these require etching of enamel and dentin with phosphoric acid prior
to application of the primer and adhesive
• Self-etch systems: these offer the ability to demineralise the tooth surface without the use of an
etching agent.
table 1: currently available adhesive systems
category technique/generation etching Priming Bonding
etch-and-rinse
3-step
4th generation
1) etchant 2) Primer 3) adhesive
2-step
5th generation
1) etchant 2) Single bottle primer/adhesive
Self-etch
2-step
6th generation
1) Self-etching primer 2) adhesive
1-step
7th generation
1) Self-etching primer/adhesive
Both techniques have known advantages and disadvantages (table 2).
the technique selected is often based on the clinical situation:
- For preparations with margins that are mainly in enamel (e.g., class iV preparations with large
bevels) the etch-and-rinse technique is often preferred.
- For surface areas that consist mainly of dentine (e.g., class i preparations) the need for more
reliable adhesion to dentine often results in the self-etch technique being preferred.
table 2: advantages and disadvantages of the etch-and-rinse and self-etch techniques
advantages Disadvantages
etch-and-rinse
• High bond strength to enamel • High risk of post-operative
sensitivity
• Potential nano-leakage when used
on dentine
Self-etch
• Ease-of-use
• Reduced post-operative sensitivity
• Chemical bond to dentine • Lower bond strength to enamel
• Potential nano-leakage when used
on enamel