[Effect of surface treatment on the bonding of silicone elastomer to acrylic resin].
OBJECTIVE
To evaluate the effects of surface treatments on the bonding of silicone elastomer to acrylic resin.


METHODS
Ninety acrylic resin specimens were randomly divided into 9 groups which were assigned to 9 different surface treatments: finished by 80-, 240-, 400-, 600-, 800-, 1000-, 1500-grit silicon carbide paper under running water, or polished or sandblasted. Roughness of the specimen surface was tested in each group, and the microstructure was observed with scanning electron microscopy (SEM). ZY-1 silicone elastomer, ZA-1 primer and acrylic resin specimens were prepared. Shear bond strength were tested and failure modes were assessed for all specimens.


RESULTS
The roughness of all 9 groups showed significant difference (P < 0.05). The sandblasted group showed the highest roughness [(2.97 + or - 0.48) microm], the 1500-grit silicon carbide paper finished group showed the lowest roughness [(0.21 + or - 0.14) microm]. The sandblasted groups showed the lowest bonding strength [(0.98 + or - 0.11) MPa] (P < 0.05) while the 600-grit silicon carbide paper finished group showed the highest strength [(2.13 + or - 0.14) MPa].


CONCLUSIONS
Over high surface roughness does not improve the shear bond strength between silicone elastomer and acrylic resin. Treatment of acrylic resin surface with 600-grit silicon carbide paper can increase the shear bond strength between silicone elastomer and acrylic resin.
Li
Feng-lan
FL
Department of Prosthodontics, College of Stomatology, The Fourth Military Medical University, Xi'an 710032, China.
Ma
Lan
L
Shi
Yong
Y
Zhao
Yi-min
YM
D000180:Acrylic Resins; D001840:Dental Bonding; D008422:Materials Testing; D033081:Shear Strength; D012826:Silicone Elastomers
D000180:Acrylic Resins; D012826:Silicone Elastomers