Total Etch Performance of One Bottle Self Etch Adhesives

Objectives: Recently a combined total etch (TE) and self etch (SE) one bottle adhesive was introduced (Scotchbond^TM Universal, SBU, 3M ESPE). Aim of this study was to assess the shear bond strength (SBS) of current one bottle SE adhesives and SBU in SE and TE modes. Moisture tolerance in TE was assessed by measuring SBS to moist and air dried etched dentin.

Methods: Bovine incisors were embedded in cold-cure acrylic resin. The labial surface of each tooth was ground to expose enamel (E) or dentin (D). A cylindrical button of Filtek^TM Z250 A3 (3M ESPE, 2.36mm diameter, 2mm height) was cured on the tooth surfaces treated with Scotchbond Universal (SBU, 3M ESPE), Xeno IV (XE4, Dentsply), Xeno V+ (XE5, Dentsply), Clearfil SE Bond, (CSE, Kuraray), G-aenial Bond (GAE, GC), iBond SE (IBS, Heraeus Kulzer), Optibond All-in-one (OAI, Kerr), AdheSE One F (AOF, Ivoclar-Vivadent) in SE mode according to the manufacturer’s instructions, and in TE mode after a 15s phosphoric acid etch (n=6). A notched-edge shear method (Ultradent) was used to measure the SBS.

Results: The table shows the SBS in MPa. The standard deviations (SD) are given in parentheses. All data per substrate were analyzed by ANOVA and multiple comparisons using Fisher’s LSD procedure (p<0.05). Means with the same letters are statistically the same.

Material	E_SE [MPa]	D_SE [MPa]	E_TE [MPa]	D_TE_moist [MPa]	D_TE_dry [MPa]
SBU	27.7(5.5)a	28.7(5.3)a	32.8(4.8)ab	29.3(4.7)a	21.8(3.3)a
XE4	18.1(2.5)b	28.4(5.8)a	29.3(6.0)b	28.8(7.7)a	15.0(2.1)bc
XE5	13.1(7.1)bc	13.9(4.0)bc	19.5(4.9)cd	15.4(2.8)bc	17.4(5.2)b
GAE	22.2(2.9)b	13.1(3.5)bc	21.8(2.9)cd	12.4(1.8)c	9.5(3.3)d
IBS	19.8(3.0)b	12.5(1.4)c	23.4(5.1)c	13.1(1.9)c	7.4(0.9)d
OAI	22.7(5.2)ab	31.0(3.0)a	35.4(1.3)a	19.1(2.2)b	11.0(5.2)cd
AOF	13.1(1.4)bc	15.3(0.7)b	17.3(1.7)d	16.6(0.2)bc	14.1(3.9)bc

Conclusions: Multiple statistically significant differences were found. SBU yielded equivalent or higher SBS in SE and TE modes than the one bottle SE adhesives.