en ترمیمی Cosmetic and Restorative Dentistry پژوهشي Research <b> Clinical Relevance</b><div> The present study was undertaken to examine the effect of phosphoric acid (PA) etching on the bond strength and acid-base resistant zone (ABRZ) formation of a two-step self-etching adhesive to enamel. Taking both bond strength and ABRZ formation into consideration, we recommend bonding enamel by the means of directly applying Clearfil SE Bond adhesive after 35% PA etching.</div><div><b> SUMMARY</b></div><div> This study examined the effect of phosphoric acid (PA) etching on the bond strength and acid-base resistant zone (ABRZ) formation of a two-step self-etching adhesive (SEA) system to enamel. An etch-and-rinse adhesive (EAR) system Single Bond (SB) and a two-step SEA system Clearfil SE Bond (SE) were used. Human teeth were randomly divided into four groups according to different adhesive treatments: 1) SB 2) SE 3) 35% PA etching→SE primer→SE adhesive (PA/SEp+a) (4) 35% PA etching→SE adhesive (PA/SEa). Microshear bond strength to enamel was measured and then statistically analyzed using one-way analysis of variance and the Tukey honestly significant difference test. The failure mode was recorded and analyzed by χ2 test. The etching pattern of the enamel surface was observed with scanning electron microscope (SEM). The bonded interface was exposed to a demineralizing solution (pH=4.5) for 4.5 hours and then 5% sodium hypochlorite with ultrasonication for 30 minutes. After argon-ion etching, the interfacial ultrastructure was observed using SEM. The microshear bond strength to enamel of the SE group was significantly lower (p<0.05) than that of the three PA-etched groups, although the latter three were not significantly different from one another. The ABRZ was detected in all the groups. In morphological observation, the ABRZ in the three PA-etched groups were obviously thicker compared with the SE group with an irregular wave-shaped edge.</div><hr><p class="MsoNormal" style="text-align: left direction: ltr unicode-bidi: embed"><b>Source: </b>Operative Dentistry <span style="font-size: 15.5pt line-height: 115% font-family: Verdana, sans-serif color: rgb(250, 250, 250) background-color: rgb(101, 111, 115) background-position: initial initial background-repeat: initial initial"><o:p /></span></p> <p class="MsoNormal" style="text-align: left direction: ltr unicode-bidi: embed"><a href="http://www.jopdentonline.org/doi/abs/10.2341/11-422-L" target="_blank"><font color="#0000ff">Full Text</font></a></p> 0 0 http://idai.ir/browse.php?a_code=A-10-32-982&slc_lang=en&sid=1 N Li 10031947532846004271 10031947532846004271 No VIP Dental Care Clinic, Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi'an, China T Nikaido 10031947532846004272 10031947532846004272 No Graduate School, Cariology and Operative Dentistry, Tokyo Medical and Dental University, Tokyo, Japan S Alireza 10031947532846004273 10031947532846004273 No Graduate School, Cariology and Operative Dentistry, Tokyo Medical and Dental University, Tokyo, Japan T Takagaki 10031947532846004274 10031947532846004274 No Cariology and Operative Dentistry, Department of Restorative Sciences, Tokyo Medical and Dental University, Tokyo, Japan J-H Chen dentjh@gmail.com 10031947532846004275 10031947532846004275 Yes Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi'an, China J Tagami 10031947532846004276 10031947532846004276 No Cariology and Operative Dentistry, Tokyo Medical and Dental University, Tokyo, Japan