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

Only gold members can continue reading. Log In or Register to continue

Share this:

• Click to share on Twitter (Opens in new window)
• Click to share on Facebook (Opens in new window)

Related

Related posts:

1. Variables related to materials and preparing for bond strength testing irrespective of the test protocol
2. Mefp-1-based peptides as hydrophilic adhesives: Bonding to zirconia
3. Cluster analysis of long-term USPHS-category changes for posterior composites
4. Gloss retention of nanocomposite resins after toothbrushing

Stay updated, free dental videos. Join our Telegram channel

Join