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Biomedical subjects

R C Knudson

Publications and source records attributed to R C Knudson.

13 recordsLinked to original sources
PubMed1992

Sleep apnea prosthesis for dentate patients.

This article describes clinical and laboratory techniques for the fabrication of a sleep apnea prosthesis for a dentate patient. The treatment objective is to posture the mandible at an increased vertical and protrusive position to diminish or eliminate the collapse of the base of tongue into the oropharynx. During fabrication of the prosthesis, cephalograms are used to evaluate spatial change between the base of the tongue and the posterior pharyngeal wall.

Acrylic Resins↗
PubMed1991

Intranasal stent for stabilization and fixation of interstitial radioactive isotopes.

This article introduces the use of an intranasal stent for the stabilization and fixation of afterloading catheters during interstitial radiation therapy. After catheters have been positioned to desired locations within the stent, they are immobilized with light polymerizing resin. The fixation of the catheters to the stent allows the radiotherapist to afterload predetermined radiation sources to desired locations. This technique maximizes tumor response and minimizes untoward effects to normal surrounding tissues.

Acrylic Resins↗
PubMed1990

Fabrication of a custom recessed tracheostoma valve retainer for the total laryngectomy patient.

Total laryngectomy patients who depend on a prosthesis for the production of alaryngeal speech often have irregular peristomal anatomy. The standard tracheostoma (speech) valve retainer cannot be intimately adapted to uneven and highly mobile tissue. Fabrication of a custom speech valve retainer is indicated under such circumstances but may be complicated by restricted access to the surgically created stoma. This article describes the clinical and laboratory techniques for the fabrication of a custom tracheostoma valve retainer that displaces the peristomal soft tissues and musculature. This technique permits access for placement of the speech valve and valve retainer in close proximity to the speech button prosthesis. Enclosure of the custom retainer in the recess underlying the peristomal musculature also provides a plug that enhances retention and increases patient confidence during alaryngeal speech. The coordinated efforts of the speech specialist and the prosthodontist in the fabrication of this prosthesis enhances the quality of life for the total laryngectomy patient.

Humans↗
PubMed1990

The sleep apnea syndrome. Part II: Treatment.

An increase in the number of obstructive sleep apnea patients has brought a paralleled demand for timely and effective treatment. Conservative measures to maintain airway patency during sleep include weight loss, lateral decubitus sleep posture, drug therapy, nasal continuous positive airway pressure, and the use of intraoral prostheses. Surgical measures are used to correct gross anatomic defects that cause or contribute to obstruction, remove redundant tissues (uvulopalatopharyngoplasty), or provide an airway below the suspected area of obstruction (tracheostomy). Part II of this article examines the rationale, benefits, disadvantages, and potential complications of each modality of treatment.

Humans↗
PubMed1990

Fabrication of a prosthesis to prevent sleep apnea in edentulous patients.

This article describes clinical and laboratory technique to use in the fabrication of a prosthesis to prevent sleep apnea in the edentulous patient. The objective of the treatment is to establish a comfortable protrusive and vertical posture of the mandible that prevents or minimizes obstruction of the airway during sleep. During fabrication of the prosthesis, cephalograms are used to assess spatial changes between the base of the tongue and the posterior pharyngeal wall.

Acrylic Resins↗
PubMed1990

Light-cured interim palatal augmentation prosthesis. A clinical report.

The interim palatal augmentation prosthesis produced a significant improvement in function within a short period of time. With the visible light-curing system, modifications of the prosthesis were made quickly and easily. The methods described enable the treatment team to immediately assess the results of prosthesis modifications.

Acrylic Resins↗
PubMed1989

Olfaction through oral tracheal breathing tube.

Cancer of the larynx has approximately a 90% cure rate if detected early. Advanced lesions are treated surgically by removing the larynx and creating a stoma that joins the trachea. Although speech can be learned, the patient's ability to smell is permanently interrupted. This technique article describes fabrication of a simple device that permits olfaction by a laryngectomee.

Equipment Design↗
PubMed1989

Implant transfer coping verification jig.

Osseointegrated implants provide a treatment modality that should be considered for the edentulous and partially edentulous patient because of the high predictability of success. This technique article describes the fabrication of a verification jig that holds the transfer copings together in the same spatial relationship. The transfer copings can be splinted on the working cast and returned to the mouth to confirm the accuracy of the working cast.

Dental Abutments↗
PubMed1989

Stabilized record base for maxillary removable partial denture obturator.

Accurate maxillomandibular jaw relation records are enhanced by a stabilized framework used to support the occlusal rim and recording medium. Stability of the framework is often lost on the defect side because of the size of the surgical defect and/or number of missing teeth. This article introduces a technique that uses a record base stabilized with a soft resilient material that permits easy removal and replacement of the framework on the altered master cast without damage.

Acrylic Resins↗
PubMed1989

The sleep apnea syndrome. Part I: Diagnosis.

Part I of this two-part article presents a review of the symptoms, pathophysiology, and diagnosis of the sleep apnea syndrome. The more common obstructive type is characterized by disturbed sleep and daytime hypersomnolence. Subjective signs and symptoms should be correlated with objective findings by way of polysomnography (sleep study) to confirm the diagnosis and determine the severity of obstructive sleep apnea. Electrocardiographic monitoring during polysomnography has revealed potentially life-threatening arrhythmias during sleep. Differential diagnosis should include central sleep apnea and narcolepsy to avoid inappropriate therapy and worsening of symptoms.

Diagnosis, Differential↗
PubMed1984

Modified clinical and laboratory procedures for fabrication of nasal prostheses.

A modified procedure that aids in the fabrication of a nasal prosthesis has been described. This method offers several distinct advantages over traditional techniques. These are (1) use of the silicone putty impression material reduces sculpturing time, (2) the tinted wax allows improved patient acceptance of the wax model at the try-on, and (3) use of conditioning material at the try-on improves marginal adaptation.

Humans↗