A study to evaluate and compare the shear bond strength of resilient liners with heat cure denture base resins, with and without the effect of saliva: an in vitro study.
OBJECTIVE
To evaluate and compare the shear bond strength of resilient liners with heat cure denture base resins in the presence or absence of saliva.


METHODS
Two commercially available heat polymerized acrylics and three commercially available denture liners were immersed in artificial saliva for 7 days and 14 days, respectively. A total of 180 (Acralyn-H, No.90 and Lucitone - 199, No.90) specimens were prepared. Total of 90 overlapping joint specimens were prepared, 45 of them using Acralyn H (AGroup) and rest 45 using Lucitone-199 (L-Group). The specimens were tested for flexural strength with a 3-point bending test on an Instron universal testing machine. The results were analyzed with a one-way analysis of variance (ANOVA).


RESULTS
The mean difference in shear bond strength (SBS) at different time intervals was found to be statistically significant (p < 0.001). Lucitone-199 recorded a significantly higher mean SBS compared to Acralyn H (p < 0.001). Further, significant differences between GC and Densply, GC and Aswin liners, and between Dentsply and Aswin were noted (p < 0.001). Difference between baseline and 7 days time interval, as well as, between baseline and 14 days time interval with respect to the mean SBS of these materials were significant (p < 0.001). Also, the mean difference in SBS between 7 days time interval and 14 days time interval was statistically significant (p < 0.001). Among the three different liners, GC yielded a higher mean SBS compared to Aswin and Dentsply at all the three time intervals. The mean SBS recorded in Dentsply and Aswin was almost same at 14 days time interval, but at baseline and 7 days, it was higher in Aswin compared to Dentsply.


CONCLUSIONS
Lucitone-199 recorded a higher mean SBS compared to Acralyn H. As the time interval increases, the mean SBS recorded in both the denture base materials decrease. Among the three different liners, GC yields a higher mean SBS compared to Aswin and Dentsply at all the three time intervals.


CONCLUSIONS
The most common reason for failures of resilient linings in removable dentures is the separation of these linings from the denture base. Therefore, poor adhesive bond properties are one of the serious defects of the material in clinical practice.
Department of Prosthodontics, Hitech Dental College and Hospital, Bhubaneshwar, Odisha, India.
C Satyanageshwar
CS
Rao
S Sreedhar
SS
Reddy
G Maruthi
GM
Prasad
K Srinivas
KS
Reddy
N Venugopal
NV
Rao
Madhukeshwara S
MS
Naik
D000180:Acrylic Resins; D000704:Analysis of Variance; D001840:Dental Bonding; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D003819:Denture Bases; D003822:Denture Liners; D006358:Hot Temperature; D008422:Materials Testing; D018583:Pliability; D058105:Polymerization; D012464:Saliva, Artificial; D033081:Shear Strength; D013718:Tensile Strength
D000180:Acrylic Resins; D012464:Saliva, Artificial