title: Fracture Resistance of Implant Abutments Following Abutment Alterations by Milling the Margins: An In Vitro Study.
abstract: This in vitro study evaluated the effect of different levels of preparation of an implant abutment on its fracture resistance. The study evaluated abutments that incorporated a platform switch (Myriad Plus Abutments, Morse Taper Connection) and Standard abutments (BioHorizons Standard Abutment, BioHorizons Inc). Each abutment was connected to an appropriate implant and mounted in a self-cured resin base. Based on the abutment preparation depths, 3 groups were created for each abutment type: as manufactured, abutment prepared 1 mm apical to the original margin, and abutment prepared 1.5 mm to the original margin. All the abutments were prepared in a standardized manner to incorporate a 0.5 mm chamfer margin uniformly. All the abutments were torqued to 30 Ncm on their respective implants. They were then subjected to loading until failure in a universal testing machine. Abutments with no preparation showed the maximum resistance to fracture for both groups. As the preparation depth increased, the fracture resistance decreased. The fracture resistance of implant abutment junction decreases as the preparation depth increases.
authors: 1   Department of Prosthodontics, M.A. Rangoonwala College of Dental Sciences and Research Centre, Pune, India.
authors: Anuya
authors: A
authors: Patankar
authors: 1   Department of Prosthodontics, M.A. Rangoonwala College of Dental Sciences and Research Centre, Pune, India.
authors: Mohit
authors: M
authors: Kheur
authors: 2   Department of Oral Pathology and Microbiology, D.Y. Patil Dental College, Pimpri, Pune, India.
authors: Supriya
authors: S
authors: Kheur
authors: 1   Department of Prosthodontics, M.A. Rangoonwala College of Dental Sciences and Research Centre, Pune, India.
authors: Tabrez
authors: T
authors: Lakha
authors: 1   Department of Prosthodontics, M.A. Rangoonwala College of Dental Sciences and Research Centre, Pune, India.
authors: Murtuza
authors: M
authors: Burhanpurwala
mesh_terms: D000044:Dental Abutments; D015921:Dental Implants; D017267:Dental Prosthesis Design; D066298:In Vitro Techniques
chemical_list: D015921:Dental Implants
keywords: abutment; fracture resistance; implant; milling