Objective: To evaluate the efficacy of surface treatments on the shear bond strength (SBS) of resin-modified glass ionomer and resin cements to commercially pure titanium (CP Ti). Methods: CP Ti discs were divided into 8 surface treatments groups (n=30): (1) 50µm Al2O3 particles; (2) 120µm Al2O3 particles; (3) 250µm Al2O3 particles; (4) 50µm Al2O3 particles + silane (RelyX Ceramic Primer); (5) 120µm Al2O3 particles + silane; (6) 250µm Al2O3 particles + silane; (7) 30µm silica-modified Al2O3 particles (Cojet Sand) + silane; (8) 110µm silica-modified Al2O3 particles (Rocatec) + silane. The luting cements (1) RelyX Luting 2; (2) RelyX ARC; (3) RelyX U100 were applied to CP Ti treated surfaces (n=10). After thermal cycling SBS test was carried out. Data were analyzed using 2-way ANOVA and Tukey's test (α=.05). Results: The results revealed that surface treatment, cement and their interaction were significant (P<.001). RelyX U100 exhibited the highest SBS values, independently of surface treatments used. Selection of the best surface treatment varied according to the cement. For the RelyX Luting 2 the best surface treatments was 50µm Al2O3 particles+silane, 120µm Al2O3 particles+silane and Rocatec+silane and for the RelyX ARC was Rocatec+silane. The use of 120µm Al2O3 particles provided the highest SBS for the RelyX U100.
Table 1. Mean SBS values (MPa), standard deviations and statistical results | |||
RelyX Luting 2 | RelyX ARC | RelyX U100 | |
Al2O3 50µm | 6.31(1.30)Be | 4.10(0.79)Cd | 12.39(2.16)Af |
Al2O3 120µm | 7.12(0.94)Bd | 5.42(0.78)Cc | 16.71(2.90)Aa |
Al2O3 250µm | 6.94(1.45)Bde | 5.74(1.11)Cc | 13.76(2.03)Ae |
Al2O3 50µm+silane | 8.30(0.96)Bab | 4.34(0.71)Cd | 15.80(3.25)Ab |
Al2O3 120µm+silane | 8.58 (0.74)Ba | 5.51(0.96)Cc | 15.35(1.75)Ac |
Al2O3 250µm+silane | 7.94(0.87)Bbc | 6.64(1.36)Cb | 14.89(1.87)Ad |
Cojet Sand+silane | 7.61(1.13)Bc | 5.70(0.93)Cc | 14.89(2.80)Ad |
Rocatec+silane | 8.52(0.47)Ca | 11.84(1.75)Ba | 15.38(3.00)Abc |
Different uppercase letters indicate significant differences in row (P<0.05)
Different lowercase letters indicate significant differences in columns (P<0.05)
Conclusion: CP Ti surface treatment may increase metal/cement bond strength but the treatments had different effect on the studied cements.