Odontostomatologike proodos最新文献

[Crack path in dental amalgams]. [牙科汞合金的裂纹路径]。

Odontostomatologike proodos Pub Date : 1990-12-01

S Oualint, P Lagouvardos, G Vougiouklakis

{"title":"[Crack path in dental amalgams].","authors":"S Oualint, P Lagouvardos, G Vougiouklakis","doi":"","DOIUrl":"","url":null,"abstract":"The need of amalgam to resist fracture becomes a more evident necessity when restoration margins are taken into consideration. Marginal microcracks permit bacteria to pass beneath the restoration resulting in cement base dessalution, secondary caries and pulp inflammation. Fracture toughness of amalgam is usually studied indirectly from the maximum force required to fracture the amalgam, during compressive, tensile or bend stresses, through its ability to deform plastically or its surface hardness. Important information on fracture toughness of amalgams can be also taken from metallographic studies of their microstructures, during or after the formation of a crack. This study was planned to evaluate the microcracks produced on the surface of different amalgams, with a Vickers pyramid head of a hardness tester and their relation to the different phases of the amalgam structure. Seven amalgams were studied: Amalcap-F, Tytin, Cupralloy, Ana-2000 and three experimental combinations of them, in order to have in the same amalgam different alloy particles, for evaluation purposes. The result showed that the structure elements, that mainly assist crack formation and propagation, are voids and gamma 2-phase, while elements that resist fracture are alloy particles (gamma-phase) in conventional amalgams, eutectic spheres in admixed high copper amalgams and eta'-phase crystals in single melt high copper amalgams.","PeriodicalId":76279,"journal":{"name":"Odontostomatologike proodos","volume":"44 6","pages":"395-401"},"PeriodicalIF":0.0,"publicationDate":"1990-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13285169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

[The Pindex system in the construction of removable dies]. [可移动模具结构中的Pindex系统]。

Odontostomatologike proodos Pub Date : 1990-12-01

D P Andritsakis

引用次数: 0

[The glass ionomer cements as bases or linings]. [玻璃离子化物作为基底或衬里]。

Odontostomatologike proodos Pub Date : 1990-12-01

A Kakaboura, G Argyri

引用次数: 0

[Determination of absorbed doses of radiation in patients during periapical dental radiography]. [根尖周牙科x线摄影患者吸收辐射剂量的测定]。

Odontostomatologike proodos Pub Date : 1990-12-01

C N Donta-Bakoyianni

引用次数: 0

[Oral hygiene habits of periodontal patients in relation to age]. 牙周病患者口腔卫生习惯与年龄的关系

Odontostomatologike proodos Pub Date : 1990-12-01

N Demetriou, A Parashis, A Tsami-Pandi

{"title":"[Oral hygiene habits of periodontal patients in relation to age].","authors":"N Demetriou, A Parashis, A Tsami-Pandi","doi":"","DOIUrl":"","url":null,"abstract":"The relationship between age and oral hygiene habits as it was defined by the answers in a special questionnaire was studied and evaluated in a group of adult periodontal patients. The answers of 185 patients were evaluated from a total of 987 questionnaires from patients presented for periodontal treatment in the private offices of the authors during the last ten years, consisting a representative sample. The questions related to the personal habits of the patient in relation with the frequency of brushing, the method of brushing, the hardness of the toothbrush, the possibility \"of brushing their gums\" and the possibility of using additional mechanical aids of oral hygiene. The results showed that the frequency of the everyday brushing is decreasing steadily and progressively from the younger to the older patients. The method of brushing as well as the choice regarding the hardness of the toothbrush that the periodontal patients are using is not influenced by age. However the knowledge of patients regarding brushing the use of additional mechanical aids of oral hygiene except the toothbrush and the value of the toothpaste are statistically significant influenced by the age of the patients. The results of this study confirm that the younger age groups of periodontal patients are more informed about oral hygiene. The greater awareness which is higher in younger patients is possible explanation for these results.","PeriodicalId":76279,"journal":{"name":"Odontostomatologike proodos","volume":"44 6","pages":"413-22"},"PeriodicalIF":0.0,"publicationDate":"1990-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13285171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

[The significance of endodontic therapy before an endodontic surgery]. 【牙髓手术前牙髓治疗的意义】。

Odontostomatologike proodos Pub Date : 1990-12-01

D Valavanis, G Spyropoulos, N Kerezoudis

引用次数: 0

[Porcelain laminate veneers (HI-CERAM)]. [陶瓷层压单板(HI-CERAM)]。

Odontostomatologike proodos Pub Date : 1990-12-01

D Paroussis, C Papaoutsopoulou

引用次数: 0

[Radiographic examination of middle face fractures]. [中面部骨折的x线检查]。

Odontostomatologike proodos Pub Date : 1990-10-01

E Stefanou, P Gritgalis, E Karyaba-Stylogianni

引用次数: 0

[Peripheral ameloblastoma of the maxilla: report of a case]. 上颌骨外周成釉细胞瘤1例。

Odontostomatologike proodos Pub Date : 1990-10-01

P Economopouloy, E Elefteriadis

{"title":"[Peripheral ameloblastoma of the maxilla: report of a case].","authors":"P Economopouloy, E Elefteriadis","doi":"","DOIUrl":"","url":null,"abstract":"A case of peripheral ameloblastoma is presented which was located in the right maxillary tuberosity area in a 52-year-old caucasian male. The lesion was asymptomatic and presented as a reddish sessile mass of soft tissue, 1.5 cm in diameter, with a granular surface and firm texture (Fig. 1). There was no radiologic evidence of bone involvement (Fig. 2). A clinical diagnosis of squamous cell carcinoma was made and a biopsy was taken. The microscopical examination revealed the presence of ameloblastomatous tissue exhibiting numerous areas of continuity with the surface epithelium (Fig. 3). The tumor showed a mixed follicular (Fig. 4) and plexiform (Fig. 5) pattern and was accompanied by a mild lymphocytic infiltrate (Fig. 3). A partial maxillectomy was performed and the histopathological examination of the surgical specimen confirmed the diagnosis of peripheral ameloblastoma. A primary basaloid pattern of the tumor was identified (Fig. 6) but a search for acanthomatous areas was proved fruitless. Some epithelial islands showed peripheral columnar cells with apically polarized nuclei (Fig. 7). The space between the border of the tumor (Fig. 8) and the underlying bone was filled with dense connective tissue and contained two isolated tumor follicles with cystic change (Fig. 9). The thorough examination of the co-existed bone did not reveal any areas of tumor invasion. Finally, the oral epithelium adjacent to the tumor exhibited elongated and slender rete ridges (Fig. 10). One and a half year post-operatively, no signs of recurrence could be detected.","PeriodicalId":76279,"journal":{"name":"Odontostomatologike proodos","volume":"44 5","pages":"351-60"},"PeriodicalIF":0.0,"publicationDate":"1990-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13285165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

[Biocompatibility of dental amalgam]. [牙科汞合金的生物相容性]。

Odontostomatologike proodos Pub Date : 1990-10-01

P Missias

{"title":"[Biocompatibility of dental amalgam].","authors":"P Missias","doi":"","DOIUrl":"","url":null,"abstract":"The purpose of the present review was to present a detailed description of those current scientific results and opinions relative to the biocompatibility of dental amalgam. The first section of the percent review to the pulpar reactions caused by amalgam fillings, especially when no protective base has been used, while the second part concerns itself with the biocompatibility of the dental amalgam per se. Specifically, reference is made to: a) the adverse reactions due to amalgam fillings both on the patient's physiological system and on the dentist's employing the material under consideration. b) those investigation results bearing a relation on the amount of mercury liberated during the amalgam filling procedures, i.e., mixing, condensation, finishing and polishing and/or removal of old amalgam fillings. c) Liberation of mercury, as well as metallic ions in the patients mouth cavity during chewing and/or during the process of intrabuccal galvanization and corrosion, and d) on the amount of mercury traced in the blood and urine of the patient following amalgam fillings. No conclusive evidence on any adverse reactions on the patient's health, attributable to the liberation of mercury from amalgam fillings, could be presented by the scientific investigations under consideration. Moreover, the number of cases reported on toxic reactions due to dental amalgam is negligible compared to the immense number of amalgam fillings performed in practice. It merits mentioning in this connection, however, the fact that the total amount of mercury attained by the patient from any other source, in conjunction with that liberated from amalgam fillings, could by all means contribute to a number of toxic reactions on the patient's health in general. Conclusively, one could state without reservations, that dental amalgam fillings per se are by and large free of toxic reactions on the patient, based on current scientific observations. Mentioning is finally made on several simple but nevertheless imperative precautions for the safety of public health.","PeriodicalId":76279,"journal":{"name":"Odontostomatologike proodos","volume":"44 5","pages":"307-17"},"PeriodicalIF":0.0,"publicationDate":"1990-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13284598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0