Adhesive systems, classification, principles of bonding, instruction for use

From WikiLectures

SMUCLER, Fillip. Consultation [lecture for subject Restorative, specialization Restorative dentistry, LF1 Charles university]. Prague. June 2012. 

Classification of adhesive systems[✎ edit | edit source]

  • There are many classifications about the adhesive systems. So, in this article we will discuss two of them.

Etching[✎ edit | edit source]

  • Total etch
We etch enamel and dentin with the same orthophosphoric acid
  • Non etch
We use different etching gel for dentin and different for enamel

Stages of etching[✎ edit | edit source]

  • 3 step etching: each material is in a different bottle
First we apply the etching gel
Then we apply the primer
In the end we place the bond
  • 2 step etching: we use only to bottles for the adhesion
Self etching primer
This bottle contains both the etching and primer
Bond is in a different bottle
Those are considered to be the 6th generation of adhesives
  • 1 step etching: one bottle
All in one
The etching gel, the primer and the bond are all in one bottle
Those are considered to be the 7th generation of adhesives

Important points for adhesive systems[✎ edit | edit source]

  • Etching in enamel must be done for longer time than in dentin
Enamel etching: 25-30 sec
Dentin etching: 15 sec
  • The purpose of the etching technique is to make dentinal and enamel surface more rough
In enamel after etching the hydroxyapatite crystal and prisms protrude thus the composite forms a much harders micromechanical bond with the tooth structure