الفهرس 
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Abstract
strength to bovine dentin (P=0.0001). On the other hand, light curing distance had no significant effect on the shear bond strength of resin composite on bovine dentin (p=0.056). Results of degree of conversion showed that Resin composite shade and increment thickness showed a statistical significant effect (p=0.0001) on degree of conversion of resin composite. Light curing distance showed a statistical significant effect (p=0.001) on the degree of conversion of resin composite. Results of cytotoxicity showed that resin composite core shade, increment thickness and the interaction among the three tested variables have a statistically significant effect (p=0.0001) on cytotoxic behavior of resin composite core material.
Under the limitations of this study, several conclusions could be suggested:
1- Blue shade is considered the only shade can be used in bulk (up to 4mm) regarding its SBS.
2- Regarding the DC and the cytotoxic behavior of the tested resin composite material, all shades are preferable to be used with incremental insertion technique with increment thickness not exceeding 2mm.
3- The light curing distance does not appear to be a detrimental factor on both the SBS and the cytotoxic behavior.
4- Increasing the light curing distance shows a negative effect on the DC of the tested resin composite.
5- Dual-cure resin composite cytotoxicity is highly affected by increment thickness and shade of the material.
Recommendations:
1- Since the DC of the tested material showed no influence on its cytotoxicity, further studies based on the evaluation of the effect of different eluted components from the resin composite material might be of value.
2- Although, SBS is considered the test of choice to correlate between different materials and adhesives, other evaluating tests, such as long term adaptation, nanoleakage or water sorption and solubility, should be considered in future research