Effect of the application time of phosphoric acid and self-etch adhesive systems to sclerotic dentin

Abstract

Objectives:To evaluate the effect of application time on the resin-dentin bond strength (µTBS) and etching pattern of adhesive systems applied on sclerotic dentine.Material and Methods:A total of forty-two bovine incisors had their roots removed. The 1-step self-etch GO (SDI), the 2-step self-etch Adper SE Bond (3MESPE) and the 35% phosphoric acid (3MESPE) from the 2-step etch-and-rinse Adper Single Bond 2 (3MESPE) were applied on the bovine incisal surfaces according to the manufacturer's instructions or duplicating the recommended conditioning time. After adhesive application, thirty teeth were restored with composite resin, stored for 24 h in distilled water at 37º C, and sectioned into resin-dentin bonded sticks (0.8 mm2) and tested according to the µTBS at 0.5 mm/min. The etching pattern of the remaining twelve teeth (n=4 for each material) was examined under scanning electron microscopy. Each tooth was divided into a buccal-to-lingual direction into three thirds, and each third randomly assigned to the groups: control (no treatment), according to the manufacturers' instructions and duplicating the recommended application time. The µTBS and the relative percentage of the tubule area opening were evaluated by two-way repeated measures ANOVA and Tukey's tests (α=0.05).Results:The duplication of the conditioning time favored only the GO adhesive (p<0.05). Both application methods significantly increased the tubule area opening (p<0.05) compared to the controls.Conclusions:The efficacy of duplicating the conditioning time was only effective for the 1-step self-etch adhesive system tested.

Influence of Isolation Method of the Operative Field on Gingival Damage, Patients' Preference, and Restoration Retention in Noncarious Cervical Lesions

“…In a recent laboratory study, the adhesive GO! produced the lowest microtensile bond strength values to dentin, 35,38 with a high percentage of premature failures. In addition, it was already reported that most of the teeth from the GO!…”

Effect of different surface treatments of human occlusal sclerotic dentin on micro‐tensile bond strength to resin composite core material

“…However, the tooth substrates and the substrate locations are different in each study. For example, tooth substrates can vary from human teeth (10,(13)(14)17,20) to bovine teeth (18)(19)21), while the location can represent cervical (10,13,17,20), incisal (18)(19)21) or palatal (14) sclerotic dentin. These factors could affect the bond strength of resin composite to the sclerotic dentin surface (22,29).…”

Aplicação dos sistemas adesivos nos últimos cinco anos

“…Mena-Serrano et al 5 verificaram a influência do tempo de aplicação do ácido fosfórico e de adesivos autocondicionantes em dentina esclerosada, verificando assim a resistência adesiva de restaurações de resina composta após os testes, foram utilizados um sistema adesivo convencional, single bond 2(3M) e dois sistemas adesivos autocondicionantes, o sistema Scothbond SE(3M) e o sistema GO(SDI), sendo testados de acordo com as normas do fabricante e também com o dobro do tempo de condicionamento, como resultado foi observado que duplicar o tempo de condicionamento para o sistema de passo único o torna mais efetivo para o sistema testado.…”

“…Mena-Serrano et al 5 verificaram a influência do tempo de aplicação do ácido fosfórico e de adesivos autocondicionantes em dentina esclerótica. Verificaram que a duplicação do tempo de aplicação tem influência direta na resistência adesiva de adesivos autocondicionantes.…”