Effects of Universal Adhesive’s Ultrasonic Application on Dentin Adhesion

AIM or PURPOSE: This study aims to evaluate the effect of

ultrasonic application of the universal bonding system on

dentin adhesion by using microtensile bond strenght(mTBS)

test, failure mode analysis and SEM observation. MATERIALS and METHOD: Twenty four non-carious

extracted human third molar teeth included to the study. Mid

coronal dentin surfaces exposed by removing occlusal

enamel 1/3 with water cooling diamond saw. The specimens

were divided to four application mode groups [(Passive Rub

bing, Active Rubbing, Passive Ultrasonic, Active Ultrasonic),

n=6, one sample of each group separated for SEM analysis].

All rubbing application groups applied with rubber micro

brush andall ultrasonic application groups applied with hand

madeultrasonic bondapplicator tip. We usedprecision scales

for standardizetion to passive application(PR,PU)’s force was

4 gr. § 1 gr., active application(AR,AU)’s force was 34 gr.§1gr.

All bonding prosedures has been applied following the manu

facturer’s instructions. Then composite restoration were

placed in minimum two layers using silicone molds. After

that we executed mTBS test using a tester device. The

recorded data were analyzed by analysis of ANOVA and

Tukey HSDtests (p<0.05).

RESULTS: Statistically significant differences were found

between application modes (p<0.05). Application mode’s

comparation was resulted PU>AU=AR>PR respectively

(p<0.05). Failure analysi compatible with mTBS test findings.

In ultrasonic application groups’ SEM observation, resin tag

quantity observed very high comparing to rubbing applica

tion groups.

CONCLUSION(S): Passive ultrasonic (PU) activation during on

dentin bonding increase the bond strenght so PU may help to

long-life restoration and decrease the leakage of fluids. In fur

ther studies should focus on the micro-nano leakage.