
pmid: 11174685
as abutments for fixed partial dentures, the goal is to establish a path of placement that will allow unimpeded insertion of the restoration in conjunction with an optimum convergence angle of 2.5 to 6.5 degrees to minimize stress concentrations.1,2 When multiple abutments are being evaluated for a common path of placement, the mouth mirror is centered over 1 abutment and moved to the next without changing the angulation of the mirror.3 Preparations need to be viewed with 1 eye closed because undercuts may remain undetected with binocular vision. This technique requires that the angulation of the mouth mirror remain unchanged as each abutment is evaluated for undercuts relative to opposing axial walls. The greater the number of abutments and the greater the distance between them, the harder it is to determine whether a common path of placement exists. Mirrors that are designed for use in taking intraoral pictures allow multiple abutments to be viewed at the same time. Viewing the implant abutments (Fig. 1) with 1 eye by using an intraoral photography mirror reveals nonparallelism of the axial walls of the abutments. Either an angled abutment must be used or the axial walls of the solid abutments must be modified. Multiple preparations confined to 1 quadrant or sextant may be viewed with a buccal photography mirror, whereas an occlusal photography mirror provides a better view of multiple preparations in an entire arch.
Dental Instruments, Photography, Dental, Humans, Dental Abutments
Dental Instruments, Photography, Dental, Humans, Dental Abutments
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