تاثير نوع خط خاتمه تراش بر ريزنشت لان در پروتز ثابتمنگي بر ايمپلنت در اكلوژن

Introduction: Resistance to sliding and tipping of a restoration must be considered at the time of treatment planning. Some factors have influence in resistance such as type of occlusion, size of occlusal table in comparison with cervix, and place and amount of occlusal forces. When the occlusal table of a restoration is wide and the cervical part is narrow, it is very probable that the line of action of an applied force on marginal ridges passes outside the margins of the restoration and produce destructive torque and causes dislodgment of the restoration. Leverage is probably the predominant factor in the dislodgment of cemented superstructure of implant supported prosthesis, that results in disruption of the cement film. The purpose of this study was to evaluate the effect of finishing line form on cement microleakage in implant supported prosthesis following occlusal forces in cusp to marginal ridge occlusion.