Hollow Abutment Screw Design for Easy Retrieval in Case of Screw Fracture in Dental Implant System

Table 1

Material properties.

Components	Material	Elasticity (Gpa)	Poisson’s ratio
Crown	Zirconia	260	0.28
Abutment	Ti alloy	113.8	0.342
Fixture
Abutment screw
Cortical bone	Cortical bone	14.0	0.3
Cancellous bone	Cancellous bone	1.5	0.45