1,721,056 research outputs found
Sinus lift and endosseous implants--preliminary surgical and prosthetic results
No full textThe authors present their experience in 43 cases of maxillary sinus augmentation with autologous bone and hydroxylapatite granules via a lateral maxillary approach. During the same operation or after six months, according to width and height of the residual alveolar ridge, hydroxylapatite coated titanium endosteal implants (IMZ) were inserted in the maxilla; after an additional healing period of 6 months, dental prostheses were applied; the mean follow-up was 14.5 months (range: 12-24 months). Out of 124 implants inserted in the grafted sinuses, 8 failed, with a 93.5% success rate, whereas of 38 implants inserted in the grafted sinuses, 8 failed, with a 93.5% success rate, whereas of 38 implants inserted in the anterior maxilla, 2 (5.3%) failed. The results from this preliminary report indicate that composite bone grafting of the maxillary sinus is a very reliable technique that provides the bony structure for correct placement of endosseous implants
Sinus lift and endosseous implants
No full textThe authors present their experience in 43 cases of maxillary sinus augmentation with autologous bone and hydroxylapatite granules via a lateral maxillary approach. During the same operation or after six months, according to width and height of the residual alveolar ridge, hydroxylapatite coated titanium endosteal implants (IMZ) were inserted in the maxilla; after an additional healing period of 6 months, dental prostheses were applied; the mean follow-up was 14.5 months (range: 12-24 months). Out of 124 implants inserted in the grafted sinuses, 8 failed, with a 93.5% success rate, whereas of 38 implants inserted in the grafted sinuses, 8 failed, with a 93.5% success rate, whereas of 38 implants inserted in the anterior maxilla, 2 (5.3%) failed. The results from this preliminary report indicate that composite bone grafting of the maxillary sinus is a very reliable technique that provides the bony structure for correct placement of endosseous implants
Possibilità terapeutiche e risultati a lungo termine degli innesti ossei di interposizione orizzontale
No full textSimultaneous rhinoplasty and maxillomandibular osteotomies: Indications and contraindications
No full textFunctional and esthetic correction of a dentofacial deformity may require not only maxillary or mandibular osteotomies but also a rhinoplasty. Rigid internal fixation makes it possible to perform rhinoplasty and maxillary osteotomies simultaneously. Nevertheless, to plan rhinoplasty correctly it is of paramount importance to predict changes of the nose that will follow osteotomy of the maxilla. The authors present their experience concerning the surgical technique, advantages, and disadvantages of rhinoplasty in combination with orthognathic surgery
Il rialzo del seno mascellare a scopo implantologico
No full textIl rialzo del seno mascellare a scopo implantologic
Il rialzo del seno mascellare a scopo implantologico mediante innesto osseo autologo: risultati preliminari
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Quaternary dedolomitization along fracture system in a Late Triassic dolomitized platform (Western Southern Alps, Italy)
No full textThe studied area belongs to a south vergent thrust and fold belt of the Southern Alps of central Lombardy where the norian Dolomia Principale crops out. This up to 2 km thick carbonate platform succession has been massively dolomitized from early to shallow burial diagenesis. Dark grey, bedded dolostones (basal Dolomia Principale), outcropping along the both lower slopes of Iseo Lake (lower Camonica Valley), show a complex network of dedolomitized white-grey areas. The calcareous lenses show an irregular, elongated (up to few meters large) shape; they are usually located along fault-fracture systems and extending along the strata bedding. Two main fabrics have been recognized: the fabric A is formed by a reticulate of small fractures filled by calcite and surrounded by fine grained calcitized halos, the fabric B is associated to more intense fracturation process that locally gave rise to breccia fabric; moreover a ochre-reddish internal sediment is locally present in small cavities or as a breccia matrix, a huge speleothem-like cementation is associated to these dedolomitized fabric. This study was aimed to reconstruct the dedolomitization process and to propose a relevant genetic model. The petrographic analyses, integrated using cathodoluminescence and electron scanning microscope allowed to find out that dedolomitization process is composed of a first phase of dolomite dissolution along permeable path ways, both at the macro and at the micro scale, followed by calcite precipitation in the pore spaces. The negative δ18O and δ13C values of the calcite cements and the calcitic fraction of the dedolomitized fabrics suggest precipitation in presence of meteoric water derived fluids. Radiometric absolute age determination (230U/234Th) indicates that calcite cements precipitated in the last 100000 years: age during which the area was subject to several advances and retreats of glacial tongues. The field mapping, analytical data and the geomorphology of the areas where the dedolomitized patches are more frequent, in correspondence of a narrow passage of the lower Camonica valley, allowed us to infer that the dedolomitization developed during glacial-interglacial phases particularly active in the region during the Pleistocene. In particular we propose that the fracturation and the first phase of dedolomitization (fabric A) occurred during the glacial period, while extensive calcite precipitation and brecciation (fabric B) formed during the interglacial periods, dominated by a warm climate during which extensive soil cover and karst processes developed
Il neurilemmoma (Schwannoma) del cavo orale: presentazione di due casi clinici
No full textNeurilemmoma (schwannoma) is a benign, encapsulated perineural tumor of neuroectodermal derivation that originates from the Schwann cells of the neural sheath of motor and sensitive peripheral nerves; the etiology is still unknown. The tumor is normally solitary, smooth-surfaced, slow growing and generally asymptomatic. It may develop at any age and there is no gender predilection. Head and neck are one of the most frequent localizations, but intraoral development is quite uncommon. In this area the mobile portion of the tongue, and in a decreasing order, the palate, the cheek mucosa, the lip and gingiva are the most frequent locations. Although it origins from the nervous tissue, only in 50% of the cases a direct relation with a nerve is demonstrated. The term schwannoma has been attributed in the past either for neurofibroma and neurilemmoma. Their histogenesis remain anyway a controversial argument. Some authors think that both tumors originate from Schwann cells and perineural connective cells. Others think that the first one originate from perineural cells, while the latter from Schwann cells. Diagnosis is confirmed by microscopic examination. Neurilemmoma shows two different components: Antoni type A and Antoni type B tissue. The first one consists of Schwann cells arranged in compact, twisted bundles, associated with delicate reticulin fibres and spindle-shaped nuclei aligned in parallel rows forming a typical palisading pattern. Between the rows there are fine cytoplasmatic fibrils with acellular, eosinophilic masses called Verocay bodies. The second one is formed by irregularly arranged masses of elongated cells and fibers similar in appearance to neurofibroma, with areas of cystic degeneration and edema.(ABSTRACT TRUNCATED AT 250 WORDS
Endosseous implants for prosthetic rehabilitation in bone grafted alveolar clefts
No full textThe authors report their experience in the surgical and prosthetic rehabilitation of three patients affected by sequelae of cleft lip and palate, with residual alveolar cleft and absence of maxillary anterior teeth. The patients were treated by means of late secondary bone grafting of the alveolar cleft, followed by the insertion of endosseous titanium plasma-sprayed implants (IMZ). After a further healing period (6-12 months) fixed dental prostheses were constructed. Preliminary results from this series have shown how dental prostheses supported by endosseous implants in grafted alveolar clefts are a very reliable possibility in dental rehabilitation of this malformation
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