Introduction: Widely damaged teeth involve enamel as well as dentin could be due to caries or other causes,resulting in the preparation of retention could not be fulfilled so that additional pin is used as retention. Pin is made of titanium and used as retention for restoration with the aim to unite restorative material in the tooth cavity by filling the hole that is prepared in the dentin

pin retained, self-threading, mechanical orthodontics, ecofriendly, amalgam restoration