Please give me some insight to develop crack bridging user element in Abaqus

Dear all

 I am trying to model damage at the interface of Dentine and enamel. AS the property of dentine material crack grown in the area of Dentine Enamel Junction(DEJ), when comes to dentine region,it start arresting due to prescence of collagen and mineral fibers in the dentine composite. I am trying to simulate that crack arresting property by modelling the DEJ region with user element facility in abaqus with crack arresting or crack healing capabilities.

Can some body help me in this regard ?

Thanks and waiting to get your insightfull advices in this regard.

Sincerely

Dhaneshwar