Bond strength and microleakage of current dentin adhesives.
OBJECTIVE
The purpose of this in vitro study was to evaluate shear bond strengths and microleakage of seven current-generation dentin adhesive systems.


METHODS
Standard box-type Class V cavity preparations were made at the cemento-enamel junction on the buccal surfaces of eighty extracted human molars. These preparations were restored using a microfill composite following application of either All-Bond 2 (Bisco), Clearfil Liner Bond (Kuraray), Gluma 2000 (Miles), Imperva Bond (Shofu), OptiBond (Kerr), Prisma Universal Bond 3 (Caulk), Scotchbond Multi-Purpose (3M), or Scotchbond Dual-Cure (3M) (control). Lingual dentin of these same teeth was exposed and polished to 600-grit. Adhesives were applied and composite was bonded to the dentin using a gelatin capsule technique. Specimens were thermocycled 500 times. Shear bond strengths were determined using a universal testing machine, and microleakage was evaluated using a standard silver nitrate staining technique.


RESULTS
Clearfill Liner Bond and OptiBond, adhesive systems that include low-viscosity, low-modulus intermediate resins, had the highest shear bond strengths (13.3 +/- 2.3 MPa and 12.9 +/- 1.5 MPa, respectively). Along with Prisma Universal Bond 3, they also had the least microleakage at dentin margins of Class V restorations.


CONCLUSIONS
No statistically significant correlation between shear bond strength and microleakage was observed in this study. Adhesive systems that include a low-viscosity intermediate resin produced the high bond strengths and low microleakage. Similarly, two materials with bond strengths in the intermediate range had significantly increased microleakage, and one material with a bond strength in the low end of the spectrum exhibited microleakage that was statistically greater. Thus, despite the lack of statistical correlation, there were observable trends.
Fortin
D
D
Départment de Restauration, Université de Montréal, Canada.
Swift
E J
EJ
Denehy
G E
GE
Reinhardt
J W
JW
D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins; D001840:Dental Bonding; D003763:Dental Leakage; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005976:Glutaral; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates; D011109:Polymethacrylic Acids; D019279:Resin Cements; D013718:Tensile Strength
C074864:All-Bond system; C084544:Clearfil Linerbond System; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C074806:Imperva-Bond; D008689:Methacrylates; C088316:Optibond Dual Cure; D011109:Polymethacrylic Acids; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; C062652:Prisma Universal Bond; C074318:Scotchbond Dual Cure; C074741:Silux Plus; D017438:Bisphenol A-Glycidyl Methacrylate; C044372:Gluma; D005976:Glutaral