{"title":"[A comparison of stress distribution at tapered vs. threaded cylindrical posts using photoelastic stress analysis].","authors":"P S Thorsteinsson, P Yaman","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The need for complex restoration of pulpless teeth has resulted from successful endodontic therapy. When a post and core is necessary thought must be given to the stress producing characteristics of the post. A two-dimensional photoelastic analysis was used to investigate the stress distribution of a tapered post and core and two different core materials on the stress distribution of a threaded cylindrical post. A cast gold tapered post with core, and a prefabricated VLock post with amalgam or composite cores were compared with the VLock post without core at installation, at vertical, and at inclined loading. The findings confirm that tapered posts are benign on installation and that threaded posts create stress where they engage the model, the stresses being intensified upon loading where the posts are in contact with the models. The findings further indicate that cores can facilitate a more favorable distribution, especially at inclined loading.</p>","PeriodicalId":77631,"journal":{"name":"Tannlaeknabladid : blad tannlaeknafelags Islands = Icelandic dental journal","volume":"9 1","pages":"7-12"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12978241","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}
{"title":"[Institutionalized elderly in Reykjavik in 1984. Their opinions of dental visits, need for dental service and possible changes in dental service and third party payments].","authors":"E Ragnarsson, G Axelsson, S Steingrímsson","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In 1984 an investigation was done among a random sample of 400 old-age pensioners, 67 yrs, and older, who were either inmates of old people's residential or nursing homes or long-term patients in geriatric departments at the hospitals in Reykjavík. A dentist asked all participants standardised questions, among which were: questions concerning dental visiting habits; opinion on the dental public health system; subjective estimation on own need for dental services; opinion on the services rendered by the dental profession; and refunds of dental fees by the public health system. During the last twelve month period only 16.6% had visited a dentist and 34% had not gone to a dentist for more than 20 years. Of those who had made use of dental services during the last 5-10 years, 79.6% said they were satisfied. Barely 75% considered themselves in need of dental services, and 67.6% claimed that they would not seek dental services more frequently if they were made available in the institution, or if free transportation were available to the dentist's office. Only 35.9% said that they would make use of free dental checkups, while 82.2% however were in favour of free health services for old age pensioners. For statistical analysis chi-square at 5% level was used, comparing the answers by sex, age, and institution. There was no statistically significant difference with the exception of difference between institutions with regard to a question of free dental services (0.005 less than p less than 0.01). This question however did not give a significant difference between the sexes or the two different age groups.</p>","PeriodicalId":77631,"journal":{"name":"Tannlaeknabladid : blad tannlaeknafelags Islands = Icelandic dental journal","volume":"9 1","pages":"17-20"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12978235","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}
{"title":"[Long-term study of incidence and occurrence of dental decay among children in Akureyri born in 1976, (11-12 years of age), 1988-89].","authors":"A Pórdarson","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The Prevalence and incidence of dental caries was determined for children living in Akureyri, North Iceland, and born in 1976. They were examined when aged 11y and again at 12y. 240 children were examined in 1988 (99.2% of 11-year-olds resident at that time) and 222 children were examined on both occasions (greater than 90% of the total age cohort). The recommended methods of WHO were used for these examinations and no radiographs were taken. No teeth had been extracted because of caries. 22.5% of children aged 11y were caries free and 19.3% of those aged 12y. Mean DFS and DFT scores at 11y were 5.7 and 3.2 respectively and 6.2 and 3.5 at 12y. These figures resemble very closely those obtained for children of the same age examined by the Schools' Dental Service in Reykjavík in the respective years. The prevalence and incidence of caries in these two Icelandic communities is similar despite being quite different with respect to the organization of dental health care. In Akureyri the dental care of children is organized by the private dental practitioners. More than half the increment in caries scores observed in the children at 12y was distributed amon only 9% of the study population (20 subjects). About one quarter of 12-years-old children had 60% of the total caries score. The decline in caries prevalence from levels previously observed in Iceland makes it now likely that the aim of WHO to reduce mean DMFT scores to 3 by 2000 AD in children aged 12y will be achieved in Iceland.</p>","PeriodicalId":77631,"journal":{"name":"Tannlaeknabladid : blad tannlaeknafelags Islands = Icelandic dental journal","volume":"9 1","pages":"21-4"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12978237","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}
{"title":"[The ability of elderly institutionalized pensioners in Reykjavik in maintaining and carrying out oral hygiene procedures in 1984].","authors":"G Axelsson, E Ragnarsson, S Steingrímsson","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In 1984 a random sample of 400 institutionalized old-age pensioners, 67 years and older, was interviewed on oral hygiene habits. Complete denture cleanliness was also studied by using a plaque detector to disclose plaque on the fitting surface of the maxillary denture. Based on the distribution of plaque a grading system using three categories (excellent, fair, poor) was applied to indicate complete denture cleanliness. About 94% of dentulous and 88.7% of edentulous respondents claimed that they were able to take care of their oral hygiene themselves. The proportion of dentulous subjects that cleaned their teeth at least once a day was 66.7%. A great majority (92.4%) of edentulous pensioners reported that they cleaned their complete dentures once a day or more often and women cleaned their dentures more frequently than men. Nevertheless cleanliness was graded excellent in only 14.4% of the complete dentures. This seems to indicate a need for increased education on the importance of a good oral hygiene and that institutionalized pensioners should receive more help with their daily oral hygiene.</p>","PeriodicalId":77631,"journal":{"name":"Tannlaeknabladid : blad tannlaeknafelags Islands = Icelandic dental journal","volume":"9 1","pages":"13-6"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12979043","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}
{"title":"[Unexpected discovery in an orthopantomogram. Case report].","authors":"G Axelsson, S E Porvaldsson","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":77631,"journal":{"name":"Tannlaeknabladid : blad tannlaeknafelags Islands = Icelandic dental journal","volume":"9 1","pages":"40-1"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12978240","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}
{"title":"[Use of hydrochloric acid and pumice to remove stains in the surface layers of enamel].","authors":"M R Grímsdóttir","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":77631,"journal":{"name":"Tannlaeknabladid : blad tannlaeknafelags Islands = Icelandic dental journal","volume":"8 1","pages":"40-2"},"PeriodicalIF":0.0,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13290365","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}
{"title":"[Incidence and estimated need for complete dentures in elderly inhabitants in nursing homes and long-term patients in hospital geriatric units in Reykjavik in 1984].","authors":"G Axelsson, E Ragnarsson, S Steingrímsson","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In 1984 prevalence and objective and subjective need for complete dentures was investigated in a random sample of 400 old-age pensioners, 67 years and older, who were either inmates of old people's residential or nursing homes or long term patients in geriatric departments of the hospitals in Reykjavík. Complete upper and lower dentures were worn by 80.5% of the inmates, a complete maxillary denture alone by 7.5% and a complete mandibular denture alone by 0.5%. Prevalence of denture wearing was significantly higher in females than males and higher in those who, before admission to the institutions, lived in Reykjavík or other towns and villages rather than in inmates coming from rural districts. The difference between estimated objective (58%) and subjective (19.2%) need for complete dentures was great.</p>","PeriodicalId":77631,"journal":{"name":"Tannlaeknabladid : blad tannlaeknafelags Islands = Icelandic dental journal","volume":"8 1","pages":"9-11"},"PeriodicalIF":0.0,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13290366","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}
{"title":"[Correction of a crossbite in an adult. Case presentation].","authors":"S Pálsson","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":77631,"journal":{"name":"Tannlaeknabladid : blad tannlaeknafelags Islands = Icelandic dental journal","volume":"8 1","pages":"36-9"},"PeriodicalIF":0.0,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13290364","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}
{"title":"[Prevalence of dental caries in children in Vopnafjördur].","authors":"S R Saemundsson, H Bergmann","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The prevalence of dental caries in Iceland has been high for many years and the improvements reported from the other Nordic countries in recent years has been slow to appear in Iceland. In this study the prevalence of dental caries among young children in Vopnafjörour, a small community in East Iceland, was investigated in the spring of 1989. Virtually all children in the community born between 1982 and 1985 were examined clinically and with bite-wing radiographs and caries scored as dmfs and DMFS according to standard criteria. The results indicated that children in this community did not have poor dental health, no worse than children from other parts of the country. Sixty-five per cent of four year old children were caries-free which is similar to the proportion reported from other Nordic countries. Children living in the country districts surrounding the town had significantly better dental health than those living in the fishing town itself. It was also apparent that four year old children attended the dentist less regularly than those aged 6 years and this was attributed to the failure of the State Health Insurance Scheme to reimburse the full cost of treatment for children younger than 6 years. Caries was unevenly distributed among the children with 78% of the total amount of caries being found in 21% of children. Clearly the best way to reduce further the prevalence of dental caries would be to concentrate effort on those children most at risk.</p>","PeriodicalId":77631,"journal":{"name":"Tannlaeknabladid : blad tannlaeknafelags Islands = Icelandic dental journal","volume":"8 1","pages":"16-20"},"PeriodicalIF":0.0,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13290490","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}