1,721,002 research outputs found
Profilometric and standard error of the mean analysis of rough implant surfaces treated with different instrumentations
No full textThis study evaluated, in vitro, the effects of different instrumentations used in the treatment of peri-implantitis on implant surfaces coated with hydroxyapatite or titanium plasma spray (TPS).
Materials and Methods: There were 14 cylindrical rough implants used, including 7 hydroxyapatite and 7 TPS coated. Split in 2 parts for a total of 24 experimental surfaces, implants were treated with a stainless-steel curette, plastic curette, ultrasonic scaler tip, and air-powder-water spray. There was 1 hydroxyapatite and 1 TPS implant used as controls. Profilometry and scanning electron microscopy were used to examine instrumented surfaces for variations in surface topography.
Results: All experimental procedures determined changes on tested rough implant surfaces. Such alterations were related to the implant coating material, and the procedure consisting in coating removal and/or leveling of surface roughness.
Conclusion: Although a plastic curette and air-powder-water spray induced less implant surface alterations, these instrumentations left deposits on the surface that may affect, in vivo, the tissue healing process
Oral and maxillofacial manifestations of Gardner's syndrome associated with growth hormone deficiency: case report and literature review
No full textGardner's syndrome (GS) is a hereditary disorder inherited as autosomal dominant with complete penetrance and variable expression. GS is a variant of familial adenomatous polyposis characterized by extracolonic manifestations including osteomas, dental anomalies, and epidermoid cysts. The association between GS and endocrine abnormalities has been well documented but a direct pituitary involvement has never been reported. We present a case of oral and maxillofacial manifestations in an adult patient affected by GS associated with growth hormone deficiency, a hitherto unreported association. The possible pathogenic mechanisms are discussed
Odontogenic keratocyst and uterus bicornis in nevoid basal cell carcinoma syndrome: Case report and literature review
No full textNevoid basal cell carcinoma syndrome (NBCCS), an autosomal dominant disorder with a high degree of penetrance and variable expressivity, is characterized by basal cell carcinomas, odontogenic keratocysts, palmar and/or plantar pits and ectopic calcifications of the falx cerebri. More than 100 minor criteria have been described but two major and one minor criteria or one major and three minor criteria are necessary for the diagnosis. In this report we present a 8 year old girl affected by NBCCS showing an uterus bicornis, an hitherto unreported association. However further researches are needed to confirm the association between NBCCS and mullerian fusion defects and to assess the hypothesis that focuses on chromosome 9 the mutant gene for NBCCS and fusion defects of female genital tract
Effetti in vitro su superfici implantari rugose di differenti strumentazioni in uso nella terapia chirurgica della perimplantite
No full textBACKGROUND: In vitro evaluation of the effects of different mechanical and manual instruments on rough implant surfaces coated with hydroxyapatite (HA) or titanium plasma sprayed (TPS). METHODS: Fourteen cylindrical rough implants have been used, 7 HA coated and 7 TPS coated. 1 HA and 1 TPS implant have been used as control. Implants, splitted in two surfaces for a total of 24 experimental areas, have been treated by ultrasonic scaler tips, stainless-steel curettes, plastic curettes and air-powder polishing. Instrumented surfaces have been examinted under light microscope by different examiners and then evaluated under scanning electron microscope. RESULTS: All experimental procedures have determined alterations of rough implant surfaces. Ultrasonic scaler tips and stainless-steel curettes have modified the surface topography of the coating in almost all samples examinted under light microscope, while alterations induced by plastic curettes and air-powder polishing have been detected respectively in 30% and 60% of the treated surfaces. The type of alteration was related to implant coating material and to the procedures used, and it may consist in coating removal or decreasing of surface roughness. The effect of ultrasonic scaler tips, although more aggressive, seems to be more limited compared to the other procedures. CONCLUSIONS: Ultrasonic scaler tips may be used in conjunction with a magnification system to limit the instrumentation to areas with bacterial deposits extremely adherent or calcified
Sindrome di Gorlin-Goltz con cheratocisti odontogene e difetti di fusione del tratto genitale femminile
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