Influence of drying time and temperature on bond strength of contemporary adhesives to dentine.
OBJECTIVE
To evaluate the bond strength (microTBS) of self-etching adhesives in different solvent evaporation conditions.


METHODS
Flat dentine surfaces from extracted human third molars were bonded with: (1) 2 two-steps self-etching adhesives (Clearfil SE Bond-CSEB); (Protect Bond-PB) and (2) 2 one-step self-etch systems (Adper Prompt L Pop-ADPLP); (Xeno III-XIII). Bonded dentine surfaces were air-dried for 5s, 20s, 30s or 40s at either 21 degrees C or 38 degrees C. Composite build-ups were constructed incrementally. After storage in water for 24h at 37 degrees C, the specimens were prepared for microtensile bond strength testing. Data were analyzed by two-way ANOVA and Student-Newman-Keuls at alpha=0.05.


RESULTS
CSEB and PB performed better at warm temperature with only 20s of air-blowing. The bond strength increased when XIII was performed at warm temperature at 40s air-blowing. Extended air-blowing not affect the performance of ADPLP, except at 30s air-blowing time at warm temperature.


CONCLUSIONS
The use of a warm air-dry stream seems to be a clinical tool to improve the bond strength to self-etching adhesives.
Garcia
Fernanda C P
FC
Faculty of Ceilândia, University of Brasilia-UnB, Ceilândia-DF, Brazil. garciafcp@uol.com.br
Almeida
Júlio C F
JC
Osorio
Raquel
R
Carvalho
Ricardo M
RM
Toledano
Manuel
M
D000134:Acid Etching, Dental / Q000379:methods*; D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods*; D003804:Dentin / Q000187:drug effects*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008964:Molar, Third; D010755:Organophosphates / Q000737:chemistry; D018709:Statistics, Nonparametric; D013696:Temperature; D013718:Tensile Strength / Q000187:drug effects
C489661:Adper Prompt Self-Etch; C503075:Clearfil Protect Bond; D017220:Dentin-Bonding Agents; D010755:Organophosphates; C487957:Xeno III; D017438:Bisphenol A-Glycidyl Methacrylate