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Biomedical subjects

A Itro

Publications and source records attributed to A Itro.

33 records · Page 2Linked to original sources
PubMedDate not supplied

[Maxillary sinus surgical lift. Summers' technique versus lateral surgical approach].

BACKGROUND: After an extensive review of the literature regarding maxillary sinus lift procedures, the authors report the results of a retrospective study carried out by the Institute of Oral and Maxillofacial Surgery at the Second University of Naples. METHODS: A group of 9 patients aged between 18 and 50 years old, including two females, were enrolled in this study. At the preliminary evaluation, the sites to be analysed showed a bone height between the residual crest and the sinusal membrane not exceeding 8 mm. All patients responded positively to specific preimplantation requisites. Commercially pure titanium fixtures were used as well as demineralised freeze-dried bovine bone and autologous bone graft from the retromolar region. RESULTS: All patients were followed for at least 15 months and no clinical check-ups were missed during that time. No implant was lost and no cases of spire exposure were reported. Postoperative vertical bone resorption was within normal values. CONCLUSIONS: Summers technique and its variations with bone grafts of various kinds represents a valid aid for edentulous maxillary rehabilitation with scarce osseous resources in the postero-superior sectors. It offers a number of advantages compared to the traditional technique using an invasive lateral approach and is more acceptable to patients. However, in spite of this positive experience, the follow-up in the literature still appears to be too short. The authors, are therefore cautious in expressing their absolute preference for Summers technique and stress the need to wait for further long-term results.

Adolescent↗
PubMedDate not supplied

Oculodentodigital dysplasia. A case report.

This report describes a rare case of oculodentodigital (ODD) dysplasia, an autosomic-dominant disease with alteration on the gene GJA1 of connexin 43 on the human chromosome 6q22-q23, highlighting the anomalies affecting face, eyes, teeth and limbs. The case described shows bilateral microphthalmia, microcornea, syndactyly and other phenotypic alterations characteristic of this syndrome, such as: nose of reduced size with hypoplasic wings, partial stenosis of the choanae, micrognathia, ogival palate and hypoplasia of the enamel. The authors emphasize the importance to know the principal features of ODD syndrome in order to make a correct diagnosis and the role of the dentist in the treatment of this pathology.

Abnormalities, Multiple↗
PubMedDate not supplied

[X-ray powder diffraction (XRD) in the study of biomaterials used in dentistry. 3].

This study considers X-ray power diffraction (XRD) applied to the study of mineral-based biomaterials used in odontostomatology. By means of this method the following materials were analysed: reabsorbable Dac Blu, non reabsorbable Dac Blu, non reabsorbable atomized Dac Blu, non reabsorbable fine Dac Blu, reabsorbable Biocoral 450, Calcitite 2040-12, Orthogel, Apagen, BTF 65, Calcitite 4060-2, Osprogel, Bio-oss, Biostite, Osprovit, Merck Hydroxyapatite. These analysis allow the identification of the crystalline phases, the study of the crystallinity and the crystal chemistry of the samples prepared as powder mixtures. This method permits the determination of the physical chemical and crystalline characteristics of these mineral based biomaterials formed by powders or transformable in powders. All of this information is indispensable for the evaluation of the functional biocompatibility of a biomaterial when its reaction in a biological environment is already known. This method has a great number of advantages against the traditional methods, marking with solid phases, it does not destroy the sample, it does not modify the physical or chemical characteristics and gives more information.

Biocompatible Materials↗
PubMedDate not supplied

[The characterization by Fourier-transform infrared vibration spectroscopy of mineral-based biomaterials commonly used in dentistry. 4].

In this study the following biomaterials were analysed by means of Fourier transform infrared vibrational spectroscopy (FTIR); they are: reabsorbable Dac Blu, non reabsorbable Dac Blu, non reabsorbable atomized Dac Blu, non reabsorbable fine Dac Blu, reabsorbable Biocoral 450, Calcitite 2040-12, Orthogel, Apagen, BTF 65, Calcitite 4060-2 Osprogel, Bio-Oss, Biostite, Osprovit, Merck Hydroxyapatite. The analysis was performed with a Jasco 5300-FTIR. At 64 readings for spectrum with a 2 cm-1 resolution. By means of this method it has been possible to perform a structural study at a molecular level of the commercial products mentioned before. The analysis showed which of the samples examined had lost the apatite OH- group during production. It also allowed the identification of some of the hydroxyapatites examined as carbonate apatites. Finally, it allowed the identification and quantification of the organic substances in the examined products.

Biocompatible Materials↗
PubMedDate not supplied

[The thermal analysis of mineral-based biomaterials used in dentistry. 5].

In this study the following commercial products were thermo-analysed (TG, DTG, DTA): reabsorbable Dac Blu, non reabsorbable Dac Blu, non reabsorbable atomized Dac Blu, non reabsorbable thin Dac Blu, reabsorbable Biocoral 450, non reabsorbable thin Dac Blu, reabsorbable Biocoral 450, Calcitite 2040-12, Orthogel, Apagen, BTF 65, Calcitite 4060-2, Osprogel, Bio-Oss, Biostite, Osprovit, Merck Hydroxiapatite. The apparatus utilized was a Setaram TAG 24, in a symmetrical set up, which gave the TG, DTG and DTA analysis simultaneously. The analysis of all the materials were performed in correct operative conditions. The thermo analyses gave useful information about the thermal stability of the samples. The TG analysis gave the data relative to the percentage of weight loss due to the volatile substances in the samples (H2Oass C, OH-, CO2). The DTG graph made it possible to establish the presence of carbonate apatite and/or hydroxyapatite or the absence of both the substances. Finally, DTA and DTG analyses allowed show the presence of various organic substances. These data were very useful to characterize the examined materials and confirmed the extreme importance and sensibility of this method.

Biocompatible Materials↗
PubMedDate not supplied

[Clinico-statistical observations on 292 cases of salivary gland pathologies].

292 cases of salivary gland diseases have been observed and treated at the Oral and Maxillo-Facial Surgery Department of the Faculty of Medicine II Naples University. The statistical results concerning age, sex, localization, histological characteristics and therapy are analysed and compared with other references.

Acute Disease↗
PubMedDate not supplied

[Experience with a rigid fixation device in maxillofacial surgery using shape-memory clips].

BACKGROUND: A device of alloy with shape-memorising effect (SME) was utilized in the surgical correction of maxillo-facial fractures. Nitinol, an alloy of equal atomic parts nickel and titanium, is a metal with the unusual property of shape memory. This alloy may be easily bent when cooled in its lower temperature phase and it resumes its original shape when heated in its higher temperature phase. A lot of useful properties of nitinol alloy, such the ability to convert heat energy into mechanical energy, as the biocompatibility and bioinertness, as the anti corrosive stability and high mechanical strength, suggest that it can be useful in the surgical fixation of maxillofacial bone injuries. METHODS: The fixing device of alloy with SME, the indications and the techniques of osteosynthesis and some cases have been discussed by the authors. RESULTS AND CONCLUSIONS: The results of this study showed that the surgical treatment of maxillo-facial bone fractures by devices of shape memory alloys is simple, ensures a good stability of fracture surfaces, reduces the time period of operative procedures and of patients rehabilitation, allowing rapid bone healing.

Adolescent↗