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Definitions */ table.MsoNormalTable {mso-style-name:"Normal Tablo"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} </style> <![endif]--> <p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align: justify; text-indent: 14.2pt;"><strong><span style="font-size: 10pt; line-height: 115%; font-family: ";Times New Roman";,";serif";;" lang="EN-US">Objectives</span></strong><span style="font-size: 10pt; line-height: 115%; font-family: ";Times New Roman";,";serif";;" lang="EN-US">: T<span style="color: #231f20;">he objective of this study was to evaluate the effect of thermal cycling on microtensile bond strengths (MTBS) of various adhesives to dentin. </span><strong>Methods:</strong> Three adhesive systems including a <span style="color: black;">1-step self-etch adhesive system (G-Bond), a 2-step self-etch adhesive system (AdheSE), and an</span> e<span style="color: black;">tch&rinse adhesive system (</span>Prime & Bond NT) were evaluated. Twenty-four extracted molars were used. After grinding the coronal enamel surface, the teeth were <span style="color: black;">randomly divided into 6 groups (<em>n</em>=4) (G-Bond, G-Bond+thermal cycling, AdheSE, AdheSE+thermal cycling, </span>Prime & Bond NT, and Prime & Bond NT+thermal cycling). Adhesives were applied according to each manufacturer’s instructions followed by resin composite polymerization.<span style="color: black;"> Groups without thermal cycling were stored in distilled water at 37 <sup>0</sup>C for 24 hours and used for immediate testing of the MTBS. Groups with thermal cycling were subjected to thermocycling (10.000 cycles between 5 <sup>0</sup>C and 55 <sup>0</sup>C, for a dwell time of 30 seconds). For MTBS test, teeth were sectioned occluso-gingivally into a serial slabs </span>and further sectioned into composite-dentin sticks.<span style="color: black;"> </span>Testing was performed on a universal testing machine at a crosshead speed of 1.0 mm/min. One-way ANOVA and post hoc Tukey-Kramer multiple comparisons tests (<em>α</em>=0.05) were performed on all data. <strong>Results:</strong> The results of the MTBS test showed that the highest bond strengths were observed in e<span style="color: black;">tch&rinse adhesive groups (3 and 3T).</span> A statistically significant difference in MTBS was found between group 1 and group 1T (<em>p</em><0.05). Moreover, there was no statistical difference in MTBS between group 1 and group 2 (<em>p</em>=1.000). <strong>Conclusions:</strong><span style="color: black;"> Contrary to result with 1</span>-step self-etch adhesive<span style="color: black;">, thermal cycling </span>was found ineffective on the MTBS of the <span style="color: black;">2</span>-step self-etch and e<span style="color: black;">tch&rinse</span> adhesive systems. </span></p> <p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align: justify; text-indent: 14.2pt;"><strong><span style="font-size: 10pt; line-height: 115%; font-family: ";Times New Roman";,";serif";;" lang="EN-US">Keywords: </span></strong><span style="font-size: 10pt; line-height: 115%; font-family: ";Times New Roman";,";serif";;" lang="EN-US">Adhesive, thermal cycling, microtensile bond strength.</span></p>
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