In this work, we develop and test a matchline dosimetry analysis tool (MDAT) to examine the dose distribution within the abutment region of two or more adjoining radiotherapy fields that employ different blocking mechanisms and geometries in forming a match. This objective and quantitative tool uses calibrated radiographic film to measure the dose in the abutment region, and uses a frequency di...

Leaf end abutment is seldom studied when delivering segmental intensity modulated radiation therapy (IMRT) fields. We developed an efficient leaf sequencing method to eliminate leaf end abutment for segmental IMRT delivery. Our method uses simple matrix and sorting operations to obtain a solution that simultaneously minimizes total monitor units and number of segments without leaf end abutment ...

The indications for implant dentistry continue to increase, enabling the restoration of partially and totally edentulous patients with greater success and predictability. Recent goals for implant dentistry include simplifying the involved procedures, reducing the duration of therapy for the patient and clinician, and enabling the use of conventional prosthodontic techniques for implant-supporte...

To resist these forces, dentistry has developed a wide variety of mechanical attachments that include circumferential clasps, bar clasps, indirect retainers, ring clasps, reverse loop clasps, hybrid clasps; and an assortment of precision attachments that include springs, flanges, snaps, latches, plungers and retentive arms. Despite dramatic differences in design, virtually all of these retentio...

Title of Document: EFFECTS OF WINGWALL CONFIGURATIONS ON THE BEHAVIOR OF INTEGRAL ABUTMENT BRIDGES Andreas Paraschos, Doctor of Philosophy, 2016 Dissertation Directed By: Professor Amde M. Amde Department of Civil and Environmental Engineering This research includes parametric studies performed with the use of three-dimensional nonlinear finite element models in order to investigate the effects...

504 THE JOURNAL OF PROSTHETIC DENTISTRY phase because new components must be purchased. This article describes a simple technique to limit the trapping of air bubbles in the cast-to abutments or prosthetic cylinders. This procedure reduces the risk of trapping air bubbles in the screw access holes of the abutment by directly injecting the investment into the cast-to abutment or prosthetic cylin...

This clinical report compares the esthetic outcome of replacing the same left maxillary central incisor with 2 types of implant-supported restorations, a zirconia abutment with a Procera crown and a custom metal abutment with metal ceramic crown. There were only subtle differences noted and both restorations yielded a satisfactory result.

The interface between a dental implant and an abutment is stabilized by two mechanical characteristics: preload of screw the friction contact surfaces abutment. These properties are quantitatively analyzed using physical formulas. important thing that such cause various biological phenomena when medical devices inserted into human bodies. Some complications in prostheses closely associated with...