الفهرس 
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Abstract
Forty sound molars have been chosen which can be detached from caries, it became cleaned and saved in physiological serum with lines of chloroform. It became detached from filling or any imperfection.
The lacquer have been chosen practically indistinguishable components of buccolingual and mesiodestal.The finish have been reestablished with fired occlusal facade of CAD/CAM lithium disilicate (LD) material.
They partitioned to 2 offices of customary format and with end line and each association separated to 2 sub organizations of bucally retentive recuperating or presently no longer with outstanding thickness 1&1.five mm.
They exposed to 2 appraisals of break opposition and minimal opening estimation .There turned into no measurably qualification of the negligible opening in the organizations
that became P esteem >0.05, while assessing the 2 offices with each and every other’s there has been an extraordinary qualification that the p esteem < 0.05. The buccal section expansion had additional break obstruction than format with out it.
This notice gave an idea roughly the recorded most burdens and next possibility of crack of the occlusal facade.