Influence of temporary cements on bond strength between resin-based luting agents and dentin.

Purpose: To examine the influence of temporary cements on the strength of the bond formed between resin-based luting agents and dentin.

Methods: An acrylic resin plate was luted to bovine dentin using one of three temporary cements; HY-Bond Temporary Cement Hard (HYB), Freegenol Temporary Pack (FTP), or Neodyne T (NDT). The control group (CON) was not treated with cement. Following the removal of the temporary cement, each dentin substrate was bonded to a silane-treated ceramic material (IPS Empress) with one of four luting agents; Super-Bond C&B (SCB), Panavia F (PAF), Nexus II (NEX), or Fuji Luting S (FLS). The specimens were immersed in water for 24 hours and the strength of the bond to shearing forces was determined.

Results: The bond strengths (in MPa), with statistical categories shown in parentheses were: HYB (25.7, a), CON (23.5, a, b), FTP (19.8, b, c), and NDT (16.8, c, d) for the SCB system; FTP (13.8, d, e), CON (12.9, d, e), NDT (10.6, e, f), and HYB (7.8, f, g, h) for the PAF system; FTP (9.2, e, f, g), CON (7.9, f, g, h), HYB (7.7, f, g, h), NDT (7.1, f, g, h) for the NEX agent; and FTP (5.2, g, h, i), CON (3.7, h, i), NDT (3.0, h, i), HYB (1.6, i) for the FLS agent, (P< 0.05).