Bonding Performance of a New Adhesive “CLEARFIL TRI-S BOND PLUS”

Kuraray Medical Inc. has developed a new self-etching adhesive “CLEARFIL TRI-S BOND PLUS (TSP)”. TSP is a single-step fluoride-releasing bond system comprised of an adhesive phosphate monomer (MDP), methacrylate monomers, water, ethanol, initiators, sodium fluoride and filler. It contains an original hydrophilic dimethacrylate in combination with HEMA to achieve optimal balance between curing property and hydrophilicity.

Objectives: The purpose of this study was to compare the tensile bond strength (TBS) of TSP to bovine enamel and dentin with other commercial 1-step and 2-steps self-etching adhesives; OptiBond All-In-One (AIO)/ Kerr (1-step) and OptiBond XTR (XTR)/ Kerr (2-steps) which contains GDMP as an adhesive monomer, CLEARFIL SE BOND (SEB)/ Kuraray Medical (2-steps) and CLEARFIL SE PROTECT (SEP)/ Kuraray Medical (2-steps) which contains MDP as well as TSP.

Methods: Each adhesive was applied to bovine enamel or dentin according to the manufacturer's instructions. TBS after 24 hrs immersion and thermo cycling (4¢ªC-60¢ªC, 1 min. each, 4,000 cycles: TC4000) was measured using a universal testing instrument (Shimadzu).

Results:

The TBS data are shown in Table 1. TSP, MDP-based optimal 1-step formulation, showed higher bond strength to bovine enamel than AIO and XTR both after 24 hrs and TC4000. Regarding dentin bonding, TBS of TSP after TC4000 was higher than that of AIO, and it was comparable to 2-steps system.

Table 1                                                                                                                        MPa(SD)

		Bovine Enamel		Bovine Dentin
		37°C, 24 hrs	TC4000	37°C, 24 hrs	TC4000
1-step	TSP	20.4(4.5)	20.5(6.1)	18.8(4.3)	21.7(2.9)
	AIO	13.0(2.5)	16.3(2.1)	13.9(2.4)	16.4(2.1)
2-steps	SEB	22.1(6.3)	21.8(7.4)	22.9(6.0)	22.5(3.8)
	SEP	22.6(4.5)	21.3(3.9)	22.7(4.0)	21.9(4.2)
	XTR	16.8(7.0)	16.2(6.5)	22.6(5.4)	19.9(3.7)

Conclusions: This result indicated that “CLEARFIL TRI-S BOND PLUS” might exhibits reliable clinical performance equal or superior to 1-step and 2-steps adhesives used in this study.