Enamel bonding system Enamel bongding depends on resin tags becoming interlocked with the surface irregularities created by etching
Enamel bonding system Enamel bongding depends on resin tags becoming interlocked with the surface irregularities created by etching
Macrotags: form between enamel rod peripheries Microtags: smaller tags form across the end of each rod Macrotags and microtags are the basis for micro-mechanical bonding
Macrotags: form between enamel rod peripheries. Microtags: smaller tags form across the end of each rod. Macrotags and microtags are the basis for micro-mechanical bonding
Dentin bonding system The difficulties of dentin bonding m More water---wet bonding Lower calcification Richer organic---collacen network Smear layer
Dentin bonding system The difficulties of dentin bonding: More water---wet bonding Lower calcification Richer organic---collagen network Smear layer
The bond strength is primarily related to micro-mechanical bonding to the intertubular dentin which occures between tubules along the cut dentin surtace
The bond strength is primarily related to micro-mechanical bonding to the intertubular dentin which occures between tubules along the cut dentin surface
Dentin Bonding Agent, DBA Early DBa were hydrophobic, bonded directly to the dentin smear layer Bond strengths < 6MPa Later dBA removed the smear layer but tended to over-etch dentin Bond strengths 1012MPa
Dentin Bonding Agent, DBA Early DBA were hydrophobic, bonded directly to the dentin smear layer. Bond strengths＜6MPa. Later DBA removed the smear layer but tended to over-etch dentin. Bond strengths≈10~12MPa