Tensile bond strength of hydroxyethyl methacrylate (HEMA) bonding agent to bovine dentine surface at various humidity

<span style="font-family: TribuneItalic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>One factor that make bonding agent adhere to dentine surface maximally is the humidity condition around the dentine surface. </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>The best bond strength between bonding agent with dentine surface is depending on the moist surface. It mean that the dentine </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>surface should neither too dry or wet. The objective of this research is to know the tensile bond strength of hydroxyethyl methacrylate </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>(HEMA) bonding agent to bovine dentine surface at various humidity. The bovine dentine was grounded to give flat surface, which </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>was then etched with 37% phosphoric acid for 15 seconds. Dentine was washed with 20 ml water and dried with blot dry technique. </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>The dentine, except the control group, was placed in a desiccator for one hour at difference humidity. Dentin was removed from </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>desiccator, then covered with bonding agent and put into tensile tool plunger. Self-cured acrylic resin was applied on this bonding </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>agent layer, which was placed on opposite-plunger. After 24 hours, tensile bond strength was measured with Autograph instrument. </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>Data was statistically analyzed with One-Way ANOVA at 95% confidence level, continued with LSD test. Results of this study showed </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>that 60%–90% humidity gave produce the lower of tensile bond strength of bonding agent to dentine surface (p </em><span style="font-family: Symbol; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">≤ <span style="font-family: TribuneItalic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>0.05). In conclusion, </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>the treatment in 60% humidity gave the greatest tensile bond strength.</em></span></span></span></span></span></span></span></span></span></span></span></span>