Objectives : In this study the addition of polymerization promoters to experimental self-etching primers on the bond stability of two-step adhesives to dentin was investigated.

Materials and methods : A model self-etching primer composed of phosphate acidic monomers, HEMA, ethanol and water was obtained. The polymerization promoters added to the primer were: none (control), camphorquinone (CQ), thioquixantone (QTX), diphenyliodonium hexafluorphosphate (DPIHPP), thiobarbituric acid derivative (TBAD) or sulfinic acid derivative (SAD). The bonding resin was composed of Bis-GMA, TEGDMA, HEMA, camphorquinone and amine. Microtensile bond strength testing to bovine dentin was carried out after 24 h or one-year storage in sodium azide solution, at 37 °C. Failure modes were classified under magnification (500×).

Results :

Polymerization promoter	24 h	One-year
Means (SD) for bond strength (MPa)
None	73.3 (15.2) A,ab	40.3 (11.0) B,a
CQ	70.8 (15.5) A,b	52.1 (11.4) B,a
QTX	74.6 (17.2) A,ab	42.0 (12.5) B,a
DPIHPP	84.3 (19.4) A,a	37.6 (10.5) B,a
TBAD	66.2 (13.5) A,b	40.8 (15.2) B,a
SAD	73.3 (15.7) A,ab	44.3 (15.6) B,a

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