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Biomedical subjects

P J Mack

Publications and source records attributed to P J Mack.

6 recordsLinked to original sources
PubMed1989

A computer analysis of condylar movement as determined by cuspal guidances.

In 1926 Hanau proposed a link between incisal, condylar, and occlusal guidances of the stomatognatic system. This work has been extended by undertaking a computer simulation of the movement of the mandible between centric occlusion and centric relation in an effort to establish a possible mathematical relationship between the variables in Hanau's "Quint." One scheme is proposed by which the geometry of the guidances might be analyzed. The results of the analysis show that there could be a direct link between an altered occlusal guidance and one of the factors involved in the initiation of the temporomandibular joint dysfunction syndrome.

Adolescent↗
PubMed1989

Denture soft lining materials: clinical indications.

The success or failure of a soft lining in a denture is dependent not only upon the physical properties of the material employed, but also on an understanding of the intended function of this group of products, and the physiological and biological properties of the resilient oral tissues upon which the denture rests. This paper identifies the clinical factors that must be reviewed in order to assess the need for and likely success of a denture soft lining material.

Alveolar Process↗
PubMed1989

A discussion of some factors of relevance to the occlusion of complete dentures.

There exists general agreement that in the construction of complete dentures the accurate positioning of the plane of occlusion is essential for correct denture function. Yet rarely does a prosthodontist give detailed instructions concerning the positioning of this plane to the technician who is to set the teeth. In this paper the three-dimensional location and form of the occlusal plane is discussed. For both anatomical and mechanical reasons the author favours the use of the mandibular rather than the maxillary record rim as the clinical determinant of the level of the artificial occlusion. A change in the method of setting the face-bow is recommended to allow for the difference between the cranial Frankfort plane and the axis-orbital plane of the articulator. Arguments are advanced to support the proposal that artificial teeth should be set to an intercuspal location forward of centric relation; and that the form of the antero-posterior compensating curve of the artificial dentition should be determined by the clinician before the teeth are set to the registration rims.

Dental Articulators↗
PubMed1989

Denture soft linings: materials available.

Denture soft lining materials are products which are applied to the fitting surfaces of dentures for the purpose of achieving a more equal distribution of load and reduction of local point pressures. These materials have provided a focus for research and controversy for over 100 years. In that time large numbers of products have been advanced as the ideal soft denture liner. This paper discusses the five main groups of materials that have been available to dentists: the natural rubbers, vinyl co-polymers, hydrophilic polymers and the silicone and acrylic based soft lining materials.

Acrylic Resins↗