In direct composite restorations, the quality of your bond is very important, it plays a significant role in both the strength and longevity of the restoration. Universal adhesives like G-Premio Bond simplify the bonding protocol without compromising performance. This guide covers how to optimise your bonding protocol for direct composites, ensuring predictable results, minimal sensitivity, and long-term success.
Etching Techniques
Etched enamel
Phosphoric acid will dissolve the superficial aprismatic enamel, exposing the surface of the enamel rods.
Surface of enamel after etching
Etched dentin
Dry dentin
Collapsed collagen fibres
Hydrated dentin
Expanded collagen fibres
Surface of the dentin after etching
Dried out dentin:
- Collagen fibre collapse
- Lack of bonding infiltration
- Post-op sensitivity, hydrolysis & degradation of exposed collagen
Hydrated dentin:
- Collagen fibres are expanded and can be infiltrated properly by the bonding agent
Smear Layer
To increase bonding infiltration one must handle the smear layer (debris) caused during the preparation. It can either be removed or modified. By etching the dentin (in total etch) the smear layer is removed. However, to avoid issues related to the etching of the dentin, one might prefer to use the adhesive on the selective etching mode where only the enamel is etched. In this case the adhesive will modify and infiltrate the smear layer at the same time. If desired the smear layer can be also modified by air abrasion before the adhesive application.
GC‘s expertise in bonding
Both GC’s Universal Bonding Systems
- Offer high bond strength – for a strong bonding both to tooth & restorations in case of repair
- Contain unique combination of three functional monomers (4-MET, MDP, MDTP), allowing top performance in all situations
- Are HEMA free – for higher durability & lower water sorption
- Have an ergonomic design – for easy use
- Deliver precise dispensing – with a high number of drops per bottle
- Can be used in all etching modes: total etch, selective etch and self etch with virtually no post-operative sensitivity
- Multiple indications: direct restorations, hypersensitivity, repair, indirect restorations, etc.
G-Premio BOND
One-step one bottle adhesive system
G2-Bond Universal
Two-step two bottle adhesive system (primer and bond)
