Biomedical subjects

H S Gray

Publications and source records attributed to H S Gray.

17 recordsLinked to original sources

PubMed1994

Occlusal adjustment: principles and practice.

Occlusal adjustment is an invasive and irreversible therapy. It is not a prophylactic procedure to be undertaken lightly. The occlusal surfaces of teeth are selectively reshaped so that the dentition will achieve the criteria of an optimum and mutually protected occlusion, at least in a Class I occlusion. The procedure, promoted some 50 years ago and modified slightly over the years, is rational and practical. However, because of the dynamic nature of the masticatory system, occlusal stability is seldom permanent and should be reviewed.

Clinical Protocols↗

PubMed1993

Occlusion and restorative dentistry: Part 1.

Dentists are responsible for the health of the masticatory system--the musculature, temporomandibular joints, and the dentition. The influence of occlusion in restorative dentistry would appear to be directly proportional to the complexity of the treatment. The criteria of a mutually protected and optimum occlusion provide sets of sound guidelines for analysis of the occlusion and for subsequent procedures. In occlusal analysis, it is important to record the several characteristics of mandibular movements made during "empty mouth" movements, and later treat when necessary, because these movements can be more damaging to the masticatory system than mastication of food.

Centric Relation↗

PubMed1993

Occlusion and restorative dentistry: Part II.

When planning treatment for major reconstruction of a dentition, occlusal factors which can affect the comfortable functioning of the masticatory system are a prime consideration. Anterior guidance and posterior support contribute significantly to the comfortable functioning of the masticatory system. Aesthetic factors are also significant for, in providing anterior guidance, the alignment, lengths, and proportions of incisors are as critical as their shape, colour and surface texture. Finally, treatment does not end with the insertion of the fixed and removable prostheses. Continual maintenance over the years can be as challenging as the reconstruction.

Aged↗

PubMed1992

Preliminary study of a pregnanolone emulsion (Kabi 2213) for i.v. induction of general anaesthesia.

Pregnanolone emulsion was administered i.v. to 13 healthy male volunteers to assess its potential as an agent for i.v. induction of general anaesthesia and to establish a pharmacokinetic profile at two doses. Each subject received 0.5 mg kg-1, 0.75 mg kg-1 and 1.0 mg kg-1 on successive occasions, the rate of administration being constant for each dose. Pregnanolone emulsion was found to produce smooth and reliable induction of general anaesthesia with cardiorespiratory effects comparable to those of other i.v. induction agents.

Adolescent↗

PubMed1989

The effect of acutely administered phenytoin on vecuronium-induced neuromuscular blockade.

Phenytoin was administered intravenously in a dose of 10 mg kg to a group of patients in whom steady state neuromuscular blockade had been established with an infusion of vecuronium. A control group of patients were given 0.9% saline instead of phenytoin. Administration of phenytoin produced significant augmentation of neuromuscular blockade (p less than 0.001). The possible mechanism of this effect is discussed.

Adult↗

PubMed1983

Movement of abutment teeth in spring cantilever bridges: a laboratory study.

The extent and directions of movements of spring bridge abutments were studied on acrylic casts with resilient steep and shallow palates and containing human molar and premolar abutments with compressible 'periodontal ligaments'. Bridges with rigid bars and 'flexible' standard, long and short lengths were cast in Type IV gold, and soldered to Type III gold retainers which were pinned to the abutments. The pontic on each bar was depressed a standard 0.2 mm, and the movement of the abutments registered on a dial gauge resting against the mesio-buccal corner of each retainer. The combination of bar length and palatal contour causing least movement of an abutment was the shortest bar to the molar abutment in the shallow palate model; indeed all bars on this model deflected the molar abutment less than similar bars on the steep palate model. Differences in palatal contours did not affect the extent of movements of the premolar abutments which were comparable to molar movements in the steep palate model. Abutment teeth moved mesio-buccally when the pontic was depressed, and the elbow of the bar usually moved off the palate indicating the fulcrum was positioned along the anterior section of the bar.

Dental Abutments↗

PubMed1979