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Biomedical subjects

W H Steen

Publications and source records attributed to W H Steen.

10 recordsLinked to original sources

Masticatory ability, denture quality, and oral conditions in edentulous subjects.

This study investigated the relationships between the ability of 38 patients with complete dentures to comminute a tough artificial test food and their answers to questions about the chewing experience. Also, clinical assessments were made of denture quality and oral conditions. Significant but weak relationships were found between the ability to comminute the test food and the subjective chewing experience as well as the degree of resorption of the mandibular residual ridge. Masticatory ability is conceivably determined by many other factors as well. Results indicate that dentists cannot rely on asking denture wearers about chewing problems and clinical responses with respect to oral conditions and denture quality for predicting those patients' masticatory abilities. The ability of wearers of complete dentures to comminute tough foods should be determined individually by a series of chewing tests.

Adult

Standardized radiographs of the alveolar crest around implants in the mandible.

The techniques currently used for standardized longitudinal radiographic evaluation of the supporting bone around dental implants are not suitable for general application. An aiming device is described for intraoral radiography used to evaluate the crestal bone height around dental implants used as retention for overdentures. This aiming device has been tested on four different implant systems by four dentists. Error analysis of serial radiographs indicates small deviations in reproducibility. It is concluded that this method is suitable for routine evaluation of dental implants.

Alveolar Process

Comminution of food by complete-denture wearers.

A method for quantifying the comminution of an artificial test food (Optosil) was evaluated with respect to its suitability for measurements of masticatory performance in complete-denture wearers. Reference was made to subjects with natural dentitions. The description of particle size distributions generated by complete-denture wearers by a Rosin-Rammler equation was subject to limitations, due to the presence of large proportions of almost-intact particles, which had hardly been damaged or broken during chewing. This finding might be explained by: (i) the relatively high fracture strength of Optosil as compared with natural foods; and (ii) the limitations of complete-denture wearers in exerting bite forces. The particle size distributions obtained after repeated measurements and described by linear interpolation of data points were reproducible. In comparison with young adults with natural dentitions, the denture-wearers needed approximately seven times more chewing strokes to achieve an equivalent reduction in particle size.

Adult

[Oligodontia].

In every dental practice patients with oligodontia can be met. Oligodontia can occur solitary or as part of a syndrome. It is important for the dentist to be familiar with the various symptoms, including those of oligodontia as part of a syndrome.

Anodontia

Anticoagulants and cataract surgery.

A series of 49 cataract operations in 42 patients is presented in support of our contention that if anticoagulants are necessary for a patient's well being, they should not be discontinued for cataract surgery.

Aged

Granular cell tumor (myoblastoma) of the orbit.

A 43-year-old woman had a three-month history of increasing proptosis and visual loss secondary to an inferior orbital mass. Surgical exploration revealed an encapsulated mass that was excised with good visual recovery. Light microscopy as well as electron microscopy confirmed the diagnosis of granular cell myoblastoma. The tumor's location within the orbit was unusual and its histologic origin was uncertain.

Adult

Pseudophakos.

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Adult