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Biomedical subjects

D Castellani

Publications and source records attributed to D Castellani.

14 recordsLinked to original sources
PubMed2000

[Mandibular atrophy and a screw-retained implant-supported prosthesis].

Prosthetic care for mandibular atrophy has raised many difficult problems, particularly in the most severe cases. The solution to most of these problems lies in the use of osteointegrated implants. Good results were obtained by using a small number of implants associated with adjustable overdenture prostheses or, alternatively, by using a larger number of implants (5 or 6) associated with a screw fixed prosthesis with posterior cantilever. Cantilever prostheses can provide support for the mental foramen zones and the posterior zones of the mandibular body where bone resorption is important after application of adjustable plates to the fibromucosa.

Aged↗
PubMed1997

An alternative method for direct custom tray construction using a visible light-cured resin.

The use of a properly made tray is highly desirable for impression making. To avoid the extra time required for tray fabrication, the alternative techniques of the putty wash or "reline" technique and intraoral fabrication of a custom tray by relining a stock tray with self-curing resin are proposed. This article illustrates a new technique of direct custom tray fabrication used for impression making for fixed prosthodontics. The proposed technique allows the direct fabrication of custom trays with light-cured resin and is time-saving, efficient, and inexpensive.

Acrylic Resins↗
PubMed1994

Thermal distortion of different materials in crown construction.

This study compared the thermal distortion of all-ceramic crowns with porcelain-fused-to-metal crowns. The materials exhibited different responses: metal ceramic crowns stabilized after an initial loss of marginal precision, and the all-ceramic crowns continued to distort with each firing cycle.

Aluminum Oxide↗
PubMed1990

[Ethical, medico-legal and deontological aspects of dentistry in HIV infection].

Medical behaviour toward HIV infected patients is often complicated by fear, confusion and lack of knowledge. Since frequently pathological manifestations in the oral area are early signs warning of HIV infection, dentists must deepen their knowledge in this field in order to be able to help diagnose for early treatment as well to cope with connected ethical, medico-legal and deontological aspects.

Attitude of Health Personnel↗
PubMed1988

Multidisciplinary team approach to the pediatric burn patient.

Burn trauma is the most devastating injury the body can sustain. Each year, 100,000 victims will sustain burn injuries serious enough to require hospitalization; 35% of these victims are children. The Shriners Hospitals for Crippled Children Burns Institute, Cincinnati Unit (SBI-Cincinnati), is a 30-bed hospital with all of the support systems of a major university medical center. SBI-Cincinnati uses a multidisciplinary team approach to family-centered care. The primary nurse and physician collaborate with the rest of the health care team to manage all aspects of care. This approach assures that coordination of care occurs and allows the family the opportunity to maintain a unique role as the primary caregiver.

Adolescent↗
PubMed1986

Prostanoid concentrations in human CSF following acute ischaemic brain infarction.

Thromboxane A2 and prostacyclin are two compounds which have been implicated as important modulators of local cerebral blood flow. Concentrations of the stable metabolites of these two compounds, thromboxane B2 and 6-keto-PGF1 alpha, were measured in cerebrospinal fluid (CSF) from eight acute ischaemic stroke patients and 14 patients with no evidence of cerebrovascular disease. Concentrations of thromboxane B2 ranged from 0.15 to 4.0 pg/ml and were significantly higher (P = 0.025) in the ischaemic stroke group when compared with the control group (0.1-0.3 pg/ml). Simultaneously acquired concentrations of 6-keto-PGF1 alpha were not elevated in the stroke group when compared to normals. These clinical findings support evidence from animal studies that emphasizes the importance of cerebral prostaglandins in mediating the secondary vascular changes of cerebral infarction. In conclusion there is an aberration in CSF thromboxane B2 concentrations in patients who have had a stroke. This may be an acute or chronic phenomenon.

6-Ketoprostaglandin F1 alpha↗
PubMed1983

Extracranial-intracranial arterial bypass and basilar artery ligation in the treatment of giant basilar artery aneurysms.

Two patients with giant aneurysms of the basilar artery treated with prophylactic extracranial-intracranial arterial bypass (EIAB) to the rostral brain stem before basilar artery ligation are presented. In both cases, the bypass provided considerable collateral flow to the upper basilar, posterior cerebral, and superior cerebellar arteries. Basilar artery ligation has been shown to be an effective, albeit dangerous, means of treating giant aneurysms of the basilar artery. The risk of significant brain stem ischemia after ligation is at least 30%. EIAB to the rostral brain stem should be considered whenever basilar artery ligation is performed, especially in cases where angiography demonstrates poor collateral circulation to the distal basilar artery.

Aged↗
PubMedDate not supplied

Resistance to fracture of metal ceramic and all-ceramic crowns.

This study evaluated the fracture resistance of three types of all-ceramic crowns and compared these to the fracture values of metal ceramics. Uniform metal ceramic specimens; veneered, cast glass-ceramic; and porcelain fused to two different dispersion-strengthened ceramic cores (Hi-Ceram and In-Ceram) were investigated. The metal ceramic specimens demonstrated a significantly higher resistance to fracture than did the Hi-Ceram or veneered glass-ceramic units but did not significantly differ from the In-Ceram specimens. The metal ceramic crowns showed cracks only in the ceramic layer, whereas the all-ceramic specimens underwent global fracture.

Aluminum Oxide↗
PubMedDate not supplied

In vivo plaque formation on cast ceramic (Dicor) and conventional ceramic.

This study compared plaque accumulation on glazed and nonglazed metal ceramic porcelain surfaces with shaded and nonshaded Dicor cast ceramic surfaces. Plaque accumulation on natural teeth was also measured at 4, 12, 24, and 48 hours. Bacterial cultures were prepared from each sample to establish the aerobic and anaerobic charge. Plaque accumulation between 12 and 24 hours was measured on different materials. No significant differences were discovered between the plaque-retaining capacities of metal ceramic porcelain and Dicor ceramic surfaces. There was less plaque accumulation on glazed surfaces than on nonglazed surfaces.

Bacteria, Aerobic↗