[Effect of bonding strength of dentin adhesive agent under 2 kinds of storage temperatures].
OBJECTIVE
To measure the changes of bonding strength of dentin adhesive agent at different storage temperatures.


METHODS
One hundred extracted bicuspids were randomly divided into 10 sets, 10 teeth in each set. Each set was further divided randomly into Group A and Group B, each with 5 teeth. During a 10-week test period, Groups A and B were applied with adhesives labeled A and B. Group A was refrigerated under 4 degrees centigrade and B was stored at room-temperature from the second week on. The first set was stored at the same situation. The shear force of samples were tested by universal material tester at the speed of 1 mm/min. The results were evaluated using one-way ANOVA and LSD t test using SPSS 18.0 software package.


RESULTS
According to one-way ANOVA, the shear bond strength of the 2 groups differed significantly (P<0.05). Comparing the sets by LSD t test, the results showed that during the first 5 weeks, there was no significant difference between Group A and B. However, there were measurable differences in performance after 6 weeks.


CONCLUSIONS
With time goes on, the bonding strength of both refrigerated and room-temperature adhesives tend to diminish. After 6 weeks, the bonding performance of the 2 groups begins to differ significantly, and the refrigerated adhesives are superior to room-temperature adhesives.
Department of Prosthodontics, the Fourth Affiliated Hospital, Zhengzhou University. Zhengzhou 450052, Henan Province, China.E-mail:zhangxiaoxiao67@126.com.
Xiao
X
Zhang
Qing
Q
Wang
Miao-miao
MM
Xue
Yi-fan
YF
Liu
D000269:Adhesives; D003188:Composite Resins; D001840:Dental Bonding; D003804:Dentin; D017220:Dentin-Bonding Agents; D006801:Humans; D008422:Materials Testing; D011897:Random Allocation; D019279:Resin Cements; D013696:Temperature
D000269:Adhesives; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements