الفهرس 
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Abstract
Restoration of decayed primary molars remains a key concern in pediatric dentistry, in which proper marginal seal and pulp protection are very essential in preventing secondary caries. This need is expected to be met by the development of materials such as ACTIVA BioACTIVE Restorative (ACTIVA).
Aim of the study: To assess the shear bond strength, bond mode of failure as well as marginal adaptation of ACTIVA in comparison to Fuji II LC when used in primary molars.
Materials and methods: Sixty primary extracted molars were randomly divided into two groups (A and B); each group consisted of 30 specimens. group A was used for measuring shear bond strength and group B for measuring marginal adaptation. group A and group B were subdivided each into three subgroups. The first subgroup received ACTIVA with no pretreatment (I). Second subgroup received ACTIVA with adhesive (II). Third subgroup received Fuji II LC (III).
Results: For shear bond strength: Results showed that ACTIVA with adhesive showed the highest mean shear bond strength whereas Fuji II LC showed the lowest with significant difference between both groups (P=0.008). The results also revealed that shear bond strength of ACTIVA with adhesive produced higher values than ACTIVA with no adhesive but with no significant difference.
For marginal adaptation: Results showed that ACTIVA with adhesive had significantly lower mean wall to wall contraction in comparison to Fuji II LC (P<0.0001). Results also showed that the mean wall to wall contraction of ACTIVA with adhesive was significantly lower than ACTIVA with no adhesive (P=0.020).
Conclusion: ACTIVA could be considered as a promising restorative material in primary teeth.