Aims:To compare the shear bond strength of sixth generation and seventh generation bonding agents to dentin.Materials and Methods:Eighty human maxillary premolars were reduced to expose flat surface of dentin and divided into four equal groups, which were bonded using following bonding agents: Sixth generation bonding agents, Adper SE Plus and Xeno III and Seventh generation bonding agents, Adper Easy One and Xeno V. Composite cylinders were then built using a plastic mould on these prepared dentinal surfaces. Samples were stored in distilled water for 24 hours and tested for shear bond strength with universal testing machine. Shear force was applied perpendicular to the long axis of composite cylinder at adhesive-tooth interface until debonding occurred. The data so obtained were tabulated and analyzed statistically using independent-samples t test and analysis of variance (ANOVA) testResults:The seventh generation adhesives showed significantly higher shear bond strength to dentin compared to sixth generation adhesives (P < 0.01). The highest value of shear bond strength was obtained from Adper Easy One system, while Adper SE Plus gave the lowest shear bond strength values.Conclusions:Seventh generation adhesives are more advantageous than sixth generation adhesives in dentin bonding as it requires less time, fewer steps, and better bond strength.

The present study indicated that GIC had the greatest dye penetration followed by CPC and MTA. Mineral trioxide aggregate and calcium phosphate cement had comparatively better sealing ability than glass ionomer cement.

The aim of the study was to compare In-vitro the micro tensile bond strength of sixth generation (Clearfil SE Bond, Kuraray, Japan), seventh generation (Adper Easy One, 3 M ESPE, Germany) and eighth generation ((Futurabond DC, Voco, Germany) dentin bonding agents. Twenty freshly extracted caries free, unrestored human molars were selected. The occlusal surfaces were ground flat; divided into four groups of five each according to the bonding agent applied and covered with composite resin (10 mm in height). The teeth were sectioned into one mm thick specimens with a cross sectional area of 1 mm square in hard tissue microtome and subjected to tensile force in a universal testing machine. The highest strength was seen in 8th generation bonding agent (Futura bond DC, Voco, Germany) 34.9332 MPa followed by 6th generation bonding agent 32.3477 MPa (Clearfil SE Bond, Kuraray dental, Japan) and the 7th generation agent 31.8826 MPa (Adper Easy One, 3M ESPE, Germany) respectively. The eighth generation dentin bonding agent appeared to be more advantageous in bonding than sixth and seventh generation dentin bonding agents

Aim:To determine the reversal effect of 10% sodium ascorbate, on the bond strength of previously bleached teeth with hydrogen peroxide.Materials and Methods:Sixty extracted maxillary premolars were selected and they were divided randomly into three groups. Group A teeth were etched and bonded; Group B bleached, etched and immediately bonded; Group C was subjected to bleaching, followed by treatment with 10% sodium ascorbate solution, then etched and bonded; Then all the three groups were subjected to testing procedure for bond strength.Results:The bond strength analysis was carried out by using instron, universal testing machine. In this study Group A had the maximum bond strength of 12.24 Mpa followed by Group C 11.62 Mpa and Group B 10.96 Mpa.Conclusion:Group C the experimental group which was treated with 10% sodium ascorbate following bleaching with 35% hydrogen peroxide provided higher bond strength compared to Group B which was bonded immediately after bleaching even though it was not statistically significant.