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Biomedical subjects

P L'Estrange

Publications and source records attributed to P L'Estrange.

9 recordsLinked to original sources
PubMed1994

Conservative management of erosion-abrasion: a system for the general practitioner.

This final article in a series of three covering general practice aspects of erosion-abrasion presents a three-phase system for clinical management of erosive-abrasive damage. The first phase comprises pre-restorative case evaluation, initial measures to control factors predisposing to continued erosion-abrasion and where necessary the provision of acrylic overlays to restore facial height. In the second phase the teeth are systematically restored using an acid-etch composite resin technique; guidance for comfortable occlusion is provided by the patient acceptance method. The third phase comprises follow-up, including monitoring of salivary and bacteriological parameters, maintenance of the restorations and modifications of preventive measures necessary to preserve the dentition restored by multiple composite therapy. Modern oral physiological concepts and recent developments in multiple composite therapy and erosion control are discussed.

Composite Resins↗
PubMed1993

Idiopathic cervical lesions: in vivo investigation by oral microendoscopy and scanning electron microscopy. A pilot study.

The development and progression of cervical lesions have not been thoroughly documented. Clinically, two morphologically distinct forms, saucer-or wedge-shaped, have been described. In this study, the micromorphology of manifest cervical lesions was documented in six subjects, by SEM replication and microendoscopy. Optoelectronic recordings were made of extreme mandibular lateral excursions. Salivary parameters were evaluated and a detailed case history, including oral hygiene and dietary habits, was taken. Lesions of varying severity could be observed in the same subject. Longitudinal fractures of the enamel were common. The dietary analyses were uneventful and salivary values were normal. No correlation was found between brushing habits and the location and severity of the lesions. The optoelectronic recordings, however, indicated a possible correlation between irregular lateral excursion and the severity and location of the lesions, with a tendency for fewer and less severe lesions on the preferred chewing side. The results have indicated some areas of interest for future studies applying non-invasive observation methods.

Adult↗
PubMed1990

Chairside evaluation of salivary parameters in patients with tooth surface loss: a pilot study.

In cases of tooth surface loss, the possibility of an erosive component should be considered, even when the lesions have the characteristic clinical appearance of abrasion or attrition. Individual susceptibility or resistance to erosive damage has been attributed to variations in the quality of saliva. Two recent studies have indicated that rate of flow of saliva and buffer capacity may be important determinants in erosion susceptibility. These parameters may be readily assessed using the chairside kits developed in Scandinavia for assessing caries susceptibility. In eight consecutive patients referred to the University of Queensland Dental School for investigation of tooth surface loss, six had no measurable quantities of resting whole saliva, four had low values for stimulated saliva flow rates, and only two patients had buffer capacities within the normal range. The results indicate the need for a larger scale study of salivary parameters in this patient group. The chairside kits provide a simple, rapid, hygienic means of assessing salivary values.

Adolescent↗
PubMed1989

Intraoral application of microcolpohysteroscopy. A new technique for clinical examination of oral tissues at high magnification.

Colposcopy is an established technique for diagnosis in gynecology. A recently developed optical instrument is the contact microcolpohysteroscope for macroscopic examination of the cervical mucosa. This article evaluates the application of the contact microcolpohysteroscope for examination and recording of the surface topography of the hard and soft tissues of the oral cavity. This is a promising, noninvasive method of observation of tissue surfaces at high magnification. Modifications of the method for oral use are described, and potential applications for diagnosis and research in dentistry are proposed.

Colposcopes↗
PubMed1987

Changes in lip pressure following extension and flexion of the head and at changed mode of breathing.

The changes in upper and lower resting lip pressures following extension and flexion of the head and at changed mode of breathing were studied in a sample of 15 adults with Class I molar relationship. The lip pressure was measured with bonded strain gauge transducers on the upper and lower central incisors. The transducers could be calibrated directly in the subject's mouth. The upper and lower lip pressures during natural head posture had a mean value of 3.91 g/cm2 and 8.58 g/cm,2 respectively. The mean values of the differences between pressures obtained during natural head posture and during 5 degrees, 10 degrees, and 20 degrees of extension showed a continuously, highly significant increase in pressure. During 5 degrees, 10 degrees, and 20 degrees of flexion, the upper lip pressure continuously decreased with highly significant values. Changes in the lower lip pressure during flexion were difficult to measure because of intense muscle activity. A significant decrease was shown for the difference in upper and lower lip pressures between nose breathing and mouth breathing, whereas there was a significant increase in pressure when the subject extended the head 5 degrees during mouth breathing.

Adult↗
PubMed1986

Temporomandibular joint disorders: a diagnostic challenge.

During the past decade much interest has been focused on disorders of the TMJ. The etiology appears to be multifactorial, with signs and symptoms difficult to evaluate and radiologic investigations insufficient. This review attempted to analyze current diagnostic tools. The recent introduction of various techniques promises optimism for this diagnostic and therapeutic challenge.

Arthroscopy↗