Water sorption of several bonding resins.
OBJECTIVE
To determine, over the period of 1 month, (a) the degree of water sorption, and (b) the change in dimension, of four bonding resins and one low viscosity resin.


METHODS
Six specimens of bonding resin (Prisma Universal Bond 3, All-Bond 2, Bondwell LC, and LB Bond from the Clearfil Liner Bond II system) and a low viscosity resin (Protect Liner F) measuring 5 mm long, 5 mm wide and 3 mm thick were made. Each specimen was weighed immediately after curing and placed in distilled water at 37 degrees C. Weights at 1, 2, 3, 7 days and 2, 3 and 4 weeks were obtained. Specimens were measured initially and at the above times. After 4 weeks, specimens were dried for 2 weeks and remeasured for size and weight. Then, the specimens were placed in a vacuum for approximately 4 hours and the weights and dimensions were remeasured. Values were converted to a mean percentage of the original dry weight and dimension and analyzed using one-way ANOVA and Fisher's PLSD test.


RESULTS
All materials absorbed most water in the first week. Prisma Universal Bond 3 stabilized within 2 days, LB Bond stabilized within the first week, whereas the remaining materials showed statistical increases in weight for 2-3 weeks (P < 0.05). After 4 weeks, LB Bond and All-Bond 2 resins demonstrated an approximate 8% weight increase, and the least increase was observed for Protect Liner F and Prisma Universal Bond 3 at about 3%. After desiccation, Protect Liner F and All-Bond 2 returned close to their original weight, and the remainder weighed less than initially. Dimensional changes were similar to changes in weight; LB Bond showed the greatest dimensional change over the 4 weeks (5%) and Protect Liner F the least change.
Burrow
M F
MF
School of Dental Science, University of Melbourne, Victoria, Australia. m.burrow@dent.unimelb.edu.au
Inokoshi
S
S
Tagami
J
J
D000704:Analysis of Variance; D018772:Dental Marginal Adaptation; D017220:Dentin-Bonding Agents; D008422:Materials Testing; D008689:Methacrylates; D019279:Resin Cements / Q000737:chemistry*; D018709:Statistics, Nonparametric; D017155:Wettability
C116064:Bond Well LC; C112274:Clearfil Liner Bond 2; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D019279:Resin Cements; C062652:Prisma Universal Bond; C100742:All-Bond 2