Biomedical subjects
Publications and source records attributed to A O Rahn.
A technique in the fabrication of a heat-cured acrylic resin transitional maxillary obturator using vinyl polysiloxane putty instead of wax is demonstrated. The putty allows a decrease in the time of fabrication in both the pattern and the processing stage of the prosthesis.
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The labial sectional impression technique in the maxillary immediate denture can be done in many different materials with varied results. The use of vinyl polysiloxane putty for this impression technique is demonstrated and shows the superior results both in the ease of use and the detail of the impression surface.
With the use of vinyl polysiloxane during fabrication of the altered cast, a complete speech aid prosthesis may be tried in at the wax stage without prior processing. Laboratory time is saved when double processing is avoided.
A simplified method of transferring diagnostic odontoplastic information from the cast to the patient is described. This technique can be used successfully when treating fixed, removable, or combination prosthodontics patients.
The Aramany classification system of postsurgical maxillectomy defects is a useful tool for teaching and developing obturator framework designs and enhancing communication among prosthodontists. This article describes a series of Aramany-obturator design templates and discusses the relevant considerations for each. In all situations, a quadrilateral or tripodal design is favored over a linear design because this allows a more favorable leverage design application that will aid in the support, stabilization, and retention of the prosthesis.
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Discussion between the surgeon and prosthodontist on surgical planning is important. It is necessary that they each be aware of the other's problems. Only in this way can continuity be established between surgical and prosthetic procedures. This will provide a maximum level of treatment for the maxillofacial patients, thereby returning them to society most expeditiously.
A laboratory experiment was conducted to measure the amount of movement in each of two directions on each of seven teeth, induced by three common designs of retainer, under both splinted and unsplinted conditions. An analysis of variance on a four-way, completely crossed, fixed-effects model showed significant main effects for design, splintedness, and teeth involved. Also of significance were the interactions between the factors of splintedness and teeth and between design and splintedness. Most of the variability in tooth movement was due to differences among the seven teeth (49.3 per cent of variance) and to the interaction of splintedness and teeth (20.2 per cent of variance).
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