Aim of the study: To assess the strength of the shear bond, 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:The present research is an in vitro experimental, comparative study where 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, there is a significant difference between ACTIVA with adhesive (AII) and Fuji II LC (AIII) (P= 0.008). No significant differences were found between ACTIVA with no adhesive (AI) and ACTIVA with adhesive (AII) and between ACTIVA with no adhesive (AI) and Fuji II LC (AIII) {(P=0.824) and (P= 0.161) respectively}.

For marginal adaptation, there is a significant difference between ACTIVA with no adhesive (BI) and ACTIVA with adhesive (BII) and between ACTIVA with adhesive (BII) and Fuji II LC (BIII) {(P=0.020) and (P