Comparison of “Look-Alike” Implant Prosthetic Retaining Screws

: The maximum preload torque of implant prosthetic retaining screws from four manufacturers and of two alloy types was measured to determine one index of interchangeability of intersystem components. Materials and Methods : Implant prosthetic retaining screws from four manufacturers (3i Implant Innovations Inc, West Palm Beach, FL; Impla-Med Inc, Sunrise, FL; Nobelpharma USA Inc, Chicago, IL; and Implant Support Systems Inc, Irvine, CA) and of two metal types (gold and titanium) were investigated using an in vitro simulation model. Five screws of each type were tightened down against a gold cylinder using a Tohnichi BTG-6 torque gauge (Tohnichi American Corporation, Northbrook, IL) until fracture occurred. Results : The 3i Implant Innovations gold and the Nobelpharma gold were not significantly different. The 3i Implant Innovations titanium and the Impla-Med gold were able to withstand less preload torque than the 3i Implant Innovations gold and the Nobelpharma gold. The Implant Support Systems titanium was able to withstand significantly more preload torque than all of the other screws. Conclusions : Interchanging implant prosthetic retaining screws could introduce new and unknown variables that may affect the long-term survival of implant fixtures and/or the implant prostheses.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/74593/1/j.1532-849X.1995.tb00310.x.pd

Measurement of composite resin filler particles by using scanning electron microscopy and digital imaging

Composite resins are routinely classified on the basis of filler particle size for purposes of research, clinical applications, and communications. The size and characterizations of filler particles have also been considered a significant factor in the rate of wear of composites. Making valid correlations between the filler particles within a composite and wear requires accuracy of filler particle size and characterization. This study was initiated to examine two methods that would (1) qualify the filler particle content of a composite resin and (2) quantify the number, size, and the area occupied by the filler particles in composite resins. Three composite resins, BIS-FIL I, Visio-Fil, and Ful-Fil, were selected as the materials to be examined, on the basis of their published composite classification type as fine particle. The findings demonstrated that scientific methods are available to examine qualitatively and measure quantitatively the composite resin filler particles in terms of their numbers, sizes, and area occupied by use of a scanning electron microscope and digital imaging. Significant differences in the filler particle numbers, sizes, and the area occupied were found for the three composite resins in this study that were classified as fine particle.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/30850/1/0000512.pd

Pantographic transfer of hinge axis : effect on articular dictated cusp movement : a thesis submitted in partial fulfillment ... restorative dentistry ... / by Merle J. Jaarda.

vii, 83 leaves.http://babel.hathitrust.org/cgi/pt?id=mdp.39015008115373;view=2up;ui=fullscreen#page/n0/mode/2uphttp://babel.hathitrust.org/cgi/pt?id=mdp.39015008115381;view=2up;ui=fullscreen#page/n0/mode/2u