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Palatal Mucosa (palatal + mucosa)
Selected AbstractsThe occurrence of porosity in reline acrylic resins.GERODONTOLOGY, Issue 1 2009Effect of microwave disinfection Background:, Microwave energy has proved to be an effective method for disinfecting acrylic dentures. However, the effect of microwave heating on the porosity of autopolymerising denture reline resins has not been investigated. Objective:, The purpose of the study was to determine the effect of microwave disinfection on the porosity of autopolymerised denture reline materials (Kooliner-K, New Truliner-NT, Tokuso Rebase Fast-TR and Ufi Gel Hard-UGH) and a conventional heat-polymerised denture base resin (Lucitone 550-L). Material and methods:, Specimens (10 mm × 20 mm × 1 mm) were obtained from the impression surface of the palatal mucosa in a single person and divided into four groups (n = 5). The porosity was evaluated after polymerisation (C1), after two cycles of microwave disinfection (MW2), after seven cycles of microwave disinfection (MW7) and after 7 days storage in water at 37°C (C2). Specimens from group MW7 were exposed to microwave disinfection daily being stored in water at 37°C between exposures. All the replicas were sputter coated with gold and micrographs/digital images were taken of each replica using scanning electron microscopy at magnification × 100. The SEM micrographs were then examined using an image analyser to determine the number of pores. Comparison between materials and groups were made using Kruskal,Wallis tests. Results:, MW7 resulted in a significant increase in the number from the pores of material K, but decreased in number in reline material TR and UGH reline resin. The number of pores in materials NT and L remained unaffected following microwave disinfection. Conclusion:, Differences in the porosity amongst the materials and for different experimental conditions were observed following microwave disinfection. [source] Rare benign tumours of oral cavity , capillary haemangioma of palatal mucosa: a case reportINTERNATIONAL JOURNAL OF PAEDIATRIC DENTISTRY, Issue 2 2000Aydan Açikgözsurname Haemangiomas are benign tumours composed of blood vessels, they are probably developmental rather than neoplastic in origin. Haemangiomas are often present at birth but may become more apparent during life. The tumours appear as a flat or raised reddish-blue lesions and are generally solitary. They are occasionally seen on the palatal mucosa. Haemangiomas are classified on the basis of their histological appearance as capillary, mixed, cavernous or a sclerosing variety that tends to undergo fibrosis. Their differential clinical diagnosis is based on appearance. The tumours may be slowly progressive, involving extensive portions of the superficial and deep blood vessels. Function may be affected where development of the lesion is extra-invasive. Colour change on pressure is a common finding with return to the original colour on withdrawal of pressure. The case presented here was referred because of swelling and recurrent periodontal bleeding. The lesion was diagnosed as a capillary haemangioma through histopathology. Although different therapeutic procedures have been reported, in this case surgical excision was carried out under general anaesthesia following hospitalization. Despite their benign origins and behaviour, haemangiomas in the region of oral cavity are always of clinical importance to the dental profession and require appropriate clinical management. Dental practitioners and oral surgeons need to be aware of these lesions because they may pose serious bleeding risks. [source] Epithelial,mesenchymal interactions in experimental oral mucosal carcinogenesisJOURNAL OF ORAL PATHOLOGY & MEDICINE, Issue 7 2001Alison M. Rich Abstract: In an effort to come to a better understanding of human oral mucosal carcinogenesis, an animal model was used in which the carcinogen 4-nitroquinoline-1-oxide was applied to rat palatal mucosa for varying periods of time. Histological and histometric analyses showed that there were quantifiable differences in the palatal epithelium to which carcinogen had been applied in comparison with control tissue. Tissue recombination experiments, using various combinations of the palatal mucosa and analysed after recovery from transplantation to hypothymic BALB/c mice, showed that control epithelium recombined with connective tissue from carcinogen-treated mucosa was altered, indicating that the underlying connective tissue modified histomorphological aspects of the epithelium in the later stages of carcinogenesis. [source] Morphological and molecular changes in denture-supporting tissues under persistent mechanical stress in ratsJOURNAL OF ORAL REHABILITATION, Issue 12 2008M. TSURUOKA Summary, The purpose of this study was to determine the effects of mechanical compression on the palatal mucosa using an experimental palatal base. The palatal base was either pressed onto (stress group) or not pressed onto (fit group) rat palatal mucosa. Blood flow was measured and the animals were sacrificed 6,72 h later for analysis. The expression of heat shock protein 70 (HSP70), vascular endothelial growth factor (VEGF) and proliferation cell nuclear antigen (PCNA) was characterized by immunohistochemical staining. For morphometric analysis, connective tissues were divided into bone side and epithelial side tissues. The ratio of PCNA-positive cells (PCNA score) was calculated, and the expressions of mRNA encoding HSP70 and VEGF was evaluated. Whereas blood flow in the stress group showed ischaemia, none was found in the fit group. Proliferation cell nuclear antigen scores on the bone side were higher than on the epithelial side in the stress group (P < 0·05). Heat shock protein 70- and VEGF-positive cells were observed under compression conditions, particularly in the periosteum. In the stress group, the expressions of mRNA encoding HSP70 and VEGF were highest at 12 h (P < 0·05). These results suggest that mechanical compression of the palatal plate induces ischaemia, and that cells in the underlying denture-supporting tissue, which includes the periosteum, synthesize HSP70 and VEGF to maintain homeostasis under these conditions. [source] Effect of palate covering on bolus-propulsion time and its contributory factorsJOURNAL OF ORAL REHABILITATION, Issue 1 2006Y. KODAIRA summary, The aim of this study was first to investigate whether the covering of the palatal mucosa with a denture base affects or not the bolus-propulsion time, and second if there was such an effect then investigate the possible contributory factors which have influence on the propulsion time. The propulsion time was measured in 21 young normal edentulous subjects under five different conditions: a complete palatal covering, non-covered palate, anterior palatal covering, posterior palatal covering and surface anaesthetized palate. As possible contributory factors palatal morphometric parameters, as well as tongue pressure were also measured. The data were analysed on the following way: changes when the palate was complete covered and non-covered, effects of sensation reduction after topic anaesthesia, effects of differences in the covering site, effects of palatal morphometric parameters and effects of tongue pressure. Ten subjects exhibited significant differences in the propulsion time when comparing the data between the complete palatal covering and the non-covered palate condition (change group). Eleven subjects did not show changes (unchanged group). Effects in the propulsion time were also recognized with posterior palatal covering-palate and superficially anaesthetized palate. With regard to the tongue pressure, significant differences during swallowing were observed. These results indicated that the bolus propulsion time into the oropharynx was affected by the palatal covering in some subjects. Moreover, the sensation in the posterior region of the hard palate, as well as the tongue pressure were also factors which affected the propulsion time during swallowing. [source] Differential diagnosis of denture-induced stomatitis, Candida, and their variations in patients using complete denture: a clinical and mycological studyMYCOSES, Issue 3 2009Saadettin Da, istan Summary Denture-induced stomatitis usually occurs in persons who wear a complete or a partial denture. Among the many aetiological and predisposing factors, Candida spp. are believed to play an important role in the initiation and progression of the infection. Seventy cases who attended the clinics of the Dental Faculty, University of Atatürk, Turkey were investigated from the viewpoint of denture-induced stomatitis. After questioning the patients for their personal information, they were examined clinically and smears were obtained from lesions of the palatal mucosa and the contiguous denture surface by calcium aliginate swabs, and inoculated onto Sabouraud dextrose agar supplemented with 1% chloramphenicol, and CHROMagar Candida. Individual yeast species were identified by a germ tube test, development of blastospores, chlamydospores and pseudohyphae and assimilation tests employing the commercial kit API 20C AUX system. According to the results obtained, 70% of the cases had denture-induced stomatitis, and in 68% of them mycological culture results were positive. Candida albicans was the most frequently isolated fungus (68.75%). On the other hand, fungal growth was much more pronounced in the cultures made from the inner surface of the dentures. In conclusion, this study showed that candidal infections are not the predisposing factor in the occurrence of denture-induced stomatitis, but they play a major role, as also some other factors, especially those related with dentures. [source] | ||||||||||