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Biomedical subjects

P J Potgieter

Publications and source records attributed to P J Potgieter.

9 recordsLinked to original sources
PubMed1990

[Contrast between retrusive contact position and intercuspal position: cephalometric study].

In this study the differences between the retrusive contact position and the intercuspal position of 20 patients were compared with their interocclusal distances and their gonial angles. A highly significant negative correlation between interocclusal distances and the differences between retrusive contact and intercuspal positions could be demonstrated. A positive correlation was also found between the gonial angles and the differences between retrusive contact an intercuspal positions. A negative correlation between gonial angles and interoclusal distances could also be demonstrated.

Cephalometry↗
PubMed1983

The determination of free-way space in edentulous patients: a cephalometric approach.

This study was prompted by the hypothesis that the contractile power of the masseter and medial pterygoid muscles influences not only the shape of the gonial angle of the mandible into which these muscles insert, but also that they play a major part in determining the amount of free-way space present in any individual. Tracings were made from the lateral cephalograms of 130 dentate subjects and the gonial angle measured in each case. Free-way space was also measured, using a dakometer, and the paired values subjected to statistical analysis. A strong inverse correlation was found to exist, indicating that throughout the sample a decrease (or sharpening) of the gonial angle is accompanied by a predictable increase in the free-way space. By applying the processes of linear regression to the paired results, a formula was obtained which may be used to predict the best value of one variable for any given value of the other. Thus, in an edentulous case, where the value of the free-way space measurement is unknown, a method is provided for predicting its best value by the determination of the patient's gonial angle through cephalometric analysis.

Adult↗
PubMed1980

Protection of patients' teeth during surgical procedures.

Trauma to the teeth, gums and dental restorations during medical procedures can be avoided by the use of a mouth protector. Three types of material are discussed and the techniques for manufacture and use are described. Two of the types are available from the manufacturer as preformed U-shaped 'shells', while the third type was manufactured especially for this study on randomly selected maxillary models of different sizes. All three types of mouth protector proved to be successful over the limited period employed in this study. Minor adjustments can be made to some of the mouth protectors for better durability and comfort. More research is needed on many more patients before the effectiveness of the different types of mouth protector can be finally assessed.

Evaluation Studies as Topic↗