[The influence of bonding strength of denture soft reline resin by different surface treatments].
OBJECTIVE
This study evaluated the influence of bonding strength of heat-polymerized denture soft reline resin by 4 different surface treatments bonded to denture base resin.


METHODS
Denture base resin (8mm in diameter and 15 mm in length) were fabricated from heat-polymerized acrylic resin (Densply). And heat-polymerized denture soft reline resin disks (Physio liner) were also made (4 mm thick and 10 mm diameter). Two denture base resins were bonded to the denture reline resin disk at the centure on the two sides of the disk. All the specimen were divided into 4 groups (n=10) with 3 different surface treatments: (1) no treatment(control), (2) sandblasted, (3) surface liner application, (4) surface liner application+sandblasted. Bond strength (MPa) was measured by tension bond testing at a 12.7 mm/min speed until the soft reline resin debonded from the base resin. Data were statistically analyzed by SPSS 10.0 software package for ANOVA.


RESULTS
The mean bond strengths of group 1, 2, 3, 4 were 3.518, 2.834, 4.077, 3.852MPa respectively. The bonding strength of all the three groups showed significant difference (P<0.0014). The group with surface liner application showed significantly highest bonding strength, while the group with sandblasted showed the lowest bonding strength.


CONCLUSIONS
The use of surface liner can significantly improve the bonding strength of heat-polymerized denture soft reline resin to the denture base resin, while the bonding strength decreased after using sandblasting.
Sun
Jian
J
Department of Prosthodontics, School of Stomatolog, Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China.
Lang
Wei-jun
WJ
Li
Jing
J
Zhang
Fu-qiang
FQ