Journal of Marmara University Dental Faculty最新文献

Actinomycosis is now a very uncommonly diagnosed human disease. Major medical centers report approximately one case a year. The pathogenesis of actinomycosis is unclear, but trauma provides a portal of entry. The cervicofacial form is the most common and usually appears as a chronic swelling with one or more draining sinus tracts. For treatment, penicillin in high doses is suggested. This case report presents a case of cervicofacial actinomycosis in a 14 year old boy which was misdiagnosed for a long time and the treatment of the disease with mezlocillin, a new antibiotic in the treatment of actinomycosis.

The aim of this study was to observe the clinical and cephalometric effects of intra-oral distalization with the maxillary bimetric arches. 3 girls and 1 boy with a mean age of 13.5 years with Class II skeletal and dental relationship were selected. Care was taken to select patients having a normal vertical growth pattern. Lateral cephalograms were taken at the beginning and at the end of the distalization period, which was approximately 3 months. To observe the distal movement, a metal marker was attached to the distal end of the buccal tube of the first molar. On each lateral cephalometric radiograph a reference plane perpendicular to the occlusal plane and passing through the point Sella was drawn to assess the amount of distalization. Cephalometric measurements indicated that the upper molars moved approximately 3 mm distally and that the lower incisors were proclined.

Class V abrasion, erosion and caries lesions restored with composite resin seem to be more susceptible to microleakage, because the gingival margin is usually placed in cementum and/or dentine. The purpose of this study was to evaluate the microleakage, in vitro, of a dentinal bonding system using a technique of restoration with a positive and a negative control. This study was accomplished using extracted human teeth and dye penetration technique. The teeth were examined for microleakage after one month. It was concluded that in the gingival wall of the cavity microleakage was significantly reduced when the dentinal bonding agent and composite resin was placed and polymerized incrementally from enamel, to cementum.

The use of implant systems is a focus of interest nowadays, as an alternative method to classical dental prostheses used in partially or completely edentulous patients. Such an interest of both the patients and the clinicians seemed likely to be due to the opportunity of using fixed prostheses on these implants. However, besides its advantages, problems exist regarding the zone of attached gingiva around implants, for the vestibular depth has generally been decreased because of the excessive amount of alveolar bone resorption. The problem from the periodontal point of view is that the periodontal pockets around implants used as abutments may turn out to be pathologic pockets and an inadequate and nonfunctional vestibular depth will result. In this study, the conventional free soft tissue autograft technique was performed around 34 implants in 9 patients in whom 40 Brånemark implants in total were placed. The postoperative evaluations indicated that the decrease in the vestibular depth, due to the shrinkage of the keratinized tissue had a negative effect on this surgical procedure. The use of acrylic stents after surgery seemed to be a better solution and would give good clinical results.

Intrusion has been regarded as a controversial topic in the literature. It is apparent from many studies that excessive forces applied in orthodontic treatment might lead to undesirable results such as circulatory disturbances, pulp degeneration, calcification and even necrosis. This study was performed to observe the reaction of pulp and roots following tooth intrusion. Material consisted of four first premolar teeth of two adult patients. One premolar of each patient was intruded orthodontically and the other premolars were taken as controls. The palatal roots of the experimental teeth were cut and examined in scanning electron microscope (SEM) and the pulps of the teeth were examined in transmission electron microscope (TEM). At SEM examination, root surfaces of intruded teeth showed resorption cavities of different diameters and depths. At TEM examination, vascular degeneration was the main change in the pulps of experimental teeth.

Two thermoplasticized gutta-percha techniques were evaluated for the percentage area of canal obturated by gutta-percha and compared with the lateral condensation of gutta-percha technique. All obturation systems were used in conjunction with Grossman's sealer. Single rooted teeth were obturated by either injected thermoplasticized gutta-percha (Ultrafil), thermoplasticized gutta-percha with metal carrier (Thermafil) or lateral condensation of gutta-percha. There were ten specimens in each group. The teeth were embedded in resin, sectioned at 1.5 mm, 3 mm and 4.5 mm from the root apex and examined with a stereomicroscope. Specimens filled by Ultrafil and Thermafil contained a significantly higher percentage of gutta-percha than specimens filled by the lateral condensation technique at every level. However no difference was found between Ultrafil and Thermafil. Three lateral condensation specimens showed voids at the 1.5 mm section; no voids were detected in specimens filled by Ultrafil or Thermafil at any level.

Hereditary gingival fibromatosis (GF) is a special type of fibrous overgrowth classified as non-inflammatory gingival enlargement. Microscopically, the connective tissue consists of coarse collagen bundles and fibroblasts. The ultrastructural examination of fibrous gingival hyperplasia reveals that fibroblasts phagocyte the mast cell granules and mast cells stimulate collagen synthesis which results in hyperplasia. In the ultrastructural examination of phenytoin-induced hyperplasia, fibroblasts, phagocytosing mast cell granules were also found. Based on these findings, the purpose of this study is to establish whether there is a relationship between fibroblasts and mast cells in GF. The gingival tissues of 5 patients with GF were examined ultrastructurally. In the connective tissue, well-defined bundles of collagen fibres were found together with fibroblasts and capillaries. There were mast cells around these capillaries which had collapsed lumens. The proximity of the mast cells and fibroblasts may indicate that mast cells play some role on collagen synthesis of fibroblasts.

In this study, the clinical effects of two extra-oral orthopaedic appliances were compared cephalometrically. Lateral cephalograms of 60 individuals were used in this investigation. The study group was randomly divided into three parts as a) control, b) mandibular headgear and c) chin-cap groups. The subjects of the study group were selected among Class III, low angle or vertically normally growing individuals. The total observation period was one year. Results showed that both appliances were effective skeletally, but there were some differences between them. The results are as follows; chin-cap therapy led to an inhibition in the development of the upper face and an effective control of the vertical dimension in addition to the posterior positioning of the mandible. Mandibular headgear inhibited general growth and development of the mandible and showed an increase in lower anterior face height and also, a significant lower molar distalization was found.

The purpose of this study was to determine the etiologic factors of denture stomatitis. Fifteen subjects with clinical evidence of localized simple denture stomatitis, fifteen subjects without clinical signs of denture stomatitis, and forty-five subjects with clinical evidence of generalized simple denture stomatitis were investigated clinically and mycologically. Subjects were evaluated according to age, sex, duration of denture usage, smoking habits, frequency of denture brushing, overnight denture wearing, pH level of saliva and degree of candidal colonization and candidal formation. Salivary samples and swabs were taken from the palate and the mucosal surfaces of the dentures investigated mycologically in order to identify the yeast colonies. Smears were taken from the palate and investigated in order to identify candidal formation. No statistically significant relationship was found between denture stomatitis and age, sex, duration of denture usage, frequency of denture brushing, overnight denture wearing or pH level of saliva. There was however, a statistically significant relationship between denture stomatitis and denture hygiene, smoking habits, candidal colonization and candidal formation.

The aim of the present study is to describe the changes in the Holdaway angle during and after treatment with a fixed appliance and to search for any possible differences between non-extraction treatment and extraction treatment. Thirty-five randomly selected Angle Class II. Division I cases with complete records before treatment, at the end of treatment, and at time at least one year out of retention, were collected. The sample was divided into two groups, one consisting of nineteen non-extraction cases and the other group of sixteen extraction cases. All cephalometric radiographs were traced on to acetate film and a computer program developed for cephalometric analysis according to the Bergen Technique was used to evaluate the radiographs. A computer program was used for the statistical evaluation of the data. In conclusion it can be said that no significant differences with regard to the Holdaway angle were found between fixed appliance therapy with or without extraction. A significant influence on the Holdaway angle itemed from the sagittal base relation (ANB) and chin prominence. It seems reasonable to assume that only orthopaedic appliances that influence sagittal base relationship, and especially the lower jaw, can have a profound influence on Holdaway angle.