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Biomedical subjects

C Piacentini

Publications and source records attributed to C Piacentini.

52 records · Page 3Linked to original sources
PubMedDate not supplied

Deep lamellar keratoplasty.

PURPOSE: To describe a new technique of lamellar surgery and to compare the results of 150 cases treated with this technique with those observed in as many cases of penetrating keratoplasty (PK). PATIENTS AND METHODS: One hundred and fifty deep lamellar keratoplasty (DLKP) procedures were performed in patients affected by various diseases of the corneal stroma but having a preserved endothelium. Each case was matched with a patient of similar age, gender and pathology who had undergone PK. The following parameters were evaluated: number of rejection episodes, density of endothelial cells, degree of ophthalmometric astigmatism, visual acuity and ocular tension. Statistical analysis was performed with Student's t test to compare patients in a similar clinical setting. RESULTS: No rejection episodes were recorded in the 150 patients who underwent DLKP surgery, whereas rejections occurred in 4% of the patients after PK. A statistically significant higher density of endothelial cells was found in DLKP cases, who also experienced a lower degree of astigmatism than PK patients. A slight but significant improvement in visual acuity was achieved in DLKP patients. CONCLUSION: Our results confirm that DLKP is the preferential procedure when no endothelial damage is involved.

Adolescent↗
PubMedDate not supplied

Morphometric computerized analysis on the dentinal tubules and the collagen fibers in the dentine of human permanent teeth.

A morphometric analysis has been performed on important components of human dentine using an image computerized analyzer. The dentinal tubule diameter and their area percentage were calculated. Moreover the area percentage of the collagen fibers in the dentinal matrix was measured. These parameters have been evaluated in different areas of the coronal and the radicular dentine in permanent teeth. Measurements have been performed on undecalcified and decalcified teeth and on teeth treated with enzymatic digestion to remove the organic non collagen matrix and to evidentiate the collagen fiber network. The values obtained in different areas of the tooth and in samples submitted to different treatments were evaluated by statistical analysis. Dentinal tubule diameter and area percentage significatively decrease from the inner to the peripheral dentine both in the undecalcified teeth as in the decalcified ones and in the samples undergone to enzymatic digestion. The collagen fiber percentage in the organic matrix is significatively lower in the mantle dentine.

Adult↗
PubMedDate not supplied

[Light and electron microscopy observations on different tissues of a complex odontoma].

Several aggregates of dental tissues constitute the complex odontoma. They are almost completely covered by a layer of prismatic enamel. By the observations at transmission and scanning electron microscope enamel present the characteristics of a not fully developed tissue. The organic component is still abundant and the enamel surface is covered by a cellular layer having the morphological features of the mature ameloblasts. Therefore this enamel results to be yet actively engaged in the maturation phase although the tissues of the odontoma have generally a limited developing time.

Adolescent↗
PubMedDate not supplied

Lymphatic vessels in inflamed human dental pulp.

Investigation has been performed on both the light and electron microscopic characteristics of the lymphatic vessels present in the dental pulp of human teeth which have been affected by serious carious lesions. These conditions provoke a severe inflammatory response resulting in structural and functional modifications of the tissue; increase of the tissue pressure is followed by the need for a more intensive lymphatic drainage. In the inflamed pulps, dilated lymphatic vessels with distended walls and "open junctions" between endothelial cells are detectable. On the other hand they lack certain endothelial structures which characterize the morphology of these vessels under normal conditions. In the pulpal regions affected by fibrotic proliferation shrunken vessels with irregular profiles are present. From these observations it is possible to obtain other information on the mechanisms regulating the lymphatic drainage in different structural and functional conditions of the interstitium.

Dental Pulp↗