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Biomedical subjects

T Bergendal

Publications and source records attributed to T Bergendal.

At least 19 recordsLinked to original sources
PubMed2000

Caries prevalence and distribution in 20-80-year-olds in Jönköping, Sweden, in 1973, 1983, and 1993.

In 1973, a cross-sectional study on oral health status was performed on 1000 individuals in the age groups 3-70 years in Jönköping, Sweden. In 1983 and 1993, new cross-sectional studies were carried out in the age groups 3-80 years. The aim of the present study was to analyze caries prevalence and distribution in the three investigations 1973, 1983, and 1993 in the age groups 20-80 years. In the younger age groups (20-40 years), a larger proportion of individuals with good oral health was found in 1993 than in 1973 or 1983. A steady increase in the number of teeth in the age groups 40-80 years could be found, which was also reflected in the increasing number of decayed and filled tooth surfaces (DFS) in the same age groups. A marked decrease in proximal DFS in 20-50-year-olds in 1993 compared to 1973 and 1983 was found. However, a rather large and unchanging group of individuals suffering from severe caries was also observed. This situation demands an individualized caries treatment strategy based on risk assessment.

Adult↗
PubMed2000

Possible sites for cylinder implants in Swedish individuals aged 20-70 years. A comparative radiological inventory in 1983 and 1993.

UNLABELLED: The aim of this study was to evaluate the number of possible sites for cylinder implants in an epidemiological sample of adult individuals and to compare these results with those from a similar inventory performed 10 years earlier. This study, which comprised individuals 20-70 years old, is part of two larger epidemiological dental studies of individuals from the community of Jönköping, Sweden, performed in 1983 and 1993. Random samples of 579 and 575 individuals respectively were examined and classified according to the Eichner index. The radiographic examination included an orthopantomogram and a full-mouth intra-oral examination. Only existing spaces anterior to the second molars were considered as possible implant sites. Cylinder implants with a diameter of 3.75 mm and a length between 7 and 20 mm were plotted on the radiographs. RESULT: The most striking result from this study was the reduction by almost a half of the total number of possible implant sites between 1983 and 1993. A certain proportion of existing tooth gaps had been treated with conventional fixed prostheses, usually in small tooth gaps, and this tendency had increased between 1983 and 1993. The need for implants in the anterior frontal region was small but constant (less than 1%) in 1983 and 1993. In the future, implants will be a treatment option in young individuals, most likely in cases of trauma and tooth agenesis. Further it may be assumed that implant treatment in edentulous jaws will continue to increase in relative terms, i.e. the percentage of edentulous jaws that have been treated with implants will increase. In absolute terms, however, the frequency of the treatment will decrease because fewer individuals will be edentulous. Instead, the proportion of partially dentate subjects treated with implants will increase.

Adult↗
PubMed1996

A multidisciplinary approach to oral rehabilitation with osseointegrated implants in children and adolescents with multiple aplasia.

Oral rehabilitation of children with extensive aplasia includes a number of dental considerations as well as attention to psychological and physical development. The well-documented results of the use of implants in adults have raised the question of the use of implants and the timing of this procedure in children and adolescents with multiple aplasia. Eight-years' experience of a multidisciplinary approach to oral rehabilitation of children with extensive aplasia is described. Special emphasis is placed on early diagnosis, careful therapy planning, and co-ordination and timing of different parts of the therapy. The specific considerations from the point of view of paediatric dentists, orthodontists, oral surgeons, and prosthodontists are presented. A system for integrating all these aspects and knowledge will be a guarantee for high professional standards and a successful outcome. To exemplify the multidisciplinary approach, three treated cases are presented.

Adolescent↗
PubMed1995

Evaluation of implant-supported carbon/graphite fiber-reinforced poly (methyl methacrylate) prostheses. A longitudinal multicenter study.

Carbon/graphite fiber-reinforced poly (methyl methacrylate) (CGFP) has been suggested as an alternative framework material for implant-supported fixed prostheses. The aim of this study was to evaluate CGFP prostheses clinically over time in patients treated with titanium implants of the Brånemark type and to study the handling of the material in the technical production. Twenty-five patients were fitted with 27 CGFP prostheses supported by 119 implants. Three implants, all in the upper jaw, were lost after loading. After a mean functioning time of 44 months (range 32-56), 19 prostheses (70%) were still in situ. In all, 5 prostheses fractured, of which 3 were exchanged whereas 2 could be repaired. The fractures were discovered early after loading and located close to the end abutment cylinders. During the follow-up period, the bone loss around the implants was about the same as earlier reported values for fixed prostheses with cast frameworks. It is concluded that a CGFP framework can be used to form the biocompatible superstructure of implant-supported prostheses with high precision at a low material cost and with good aesthetic results. The mechanical properties are so far not satisfactory but the method has the potential to be further developed and standardized.

Adult↗
PubMed1995

Oral health of individuals aged 3-80 years in Jönköping, Sweden in 1973, 1983, and 1993. I. Review of findings on dental care habits and knowledge of oral health.

The aim of the present study was to compare data on dental care habits and knowledge of oral health in three cross-sectional studies carried out in 1973, 1983, and 1993. The 1973 study constituted a random sample of 1000 individuals evenly distributed in the age groups 3, 5, 10, 15, 20, 30, 40, 50, 60, and 70 years. The same age groups with addition of a group of 80-year-olds were included in the 1983 and 1993 studies which comprised 1104 and 1078 individuals, respectively. A questionnaire (23-101 questions) about dental care habits and knowledge of oral health was used in connection with a clinical and radiographic examination. The same questions were used in all the three studies. An addition to the 1993 investigation was questions concerning ethnographic background. In 1993 approximately 95% of all individuals were visiting the dentist on a regular basis every or every second year. The 30-year-olds, however, did not visit a dentist as regularly in 1993 as in 1983. The 70- and 80-year-olds visited a dentist more regularly in 1993 than in 1983. An increased number of adults in all age groups, except for the 70-year-olds, received their dental care in the Public Dental Service in 1993 compared to 1983 and 1973. Most 40-year-olds and older, however, received their dental care by private practitioners. About 80% of all adults in 1993 were enrolled in a recall system on the dentist's initiative while in 1973 most appointments were based on the patient's own initiative. The number of individuals who felt discomfort at the prospect of an appointment with the dentist was more or less the same in 1973, 1983, and 1993. The knowledge of the etiology of dental diseases has not changed much between 1973 and 1993. The frequency of toothbrushing has increased since 1973 and in 1993 more than 95% of all individuals brushed their teeth daily. The use of dental floss and toothpicks as well as disclosing tablets decreased in 1993 compared to 1983. Almost all individuals in 1993 used fluoride toothpaste. The use of topical fluorides and fluoride tablets in children had decreased considerably in 1993 compared to 1983.

Adolescent↗
PubMed1995

Oral health of individuals aged 3-80 years in Jönköping, Sweden in 1973, 1983, and 1993. II. Review of clinical and radiographic findings.

The aim of this epidemiological study was to analyse various clinical and radiographic data on oral health and compare the results to those of two cross-sectional studies carried out in 1973 and 1983. In 1973, 1983, and 1993 a random sample of 1000, 1104, and 1078 individuals, respectively were studied. The individuals were evenly distributed in the age groups 3, 5, 10, 15, 20, 30, 40, 50, 60, and 70 years. In 1983 and 1993 80-year-olds were also included. All subjects were inhabitants of the community of Jönköping, Sweden. The clinical and radiographic examination assessed edentulousness, removable dentures, implants, number of teeth, caries, restorations and overhangs, oral hygiene, calculus, periodontal status, endodontic treatment, and periapical status. The number of edentulous individuals was reduced by half from 1973 to 1993 and is now 8% in the age groups 40-70 years. The mean number of teeth has increased and up to the age of 50 years the individuals had more or less complete dentitions. During the 20-year period there was generally decreasing number of carious lesions and restorations. In the 15- and 20-year-olds, however, there was an increasing number of decayed/filled tooth surfaces in 1993 compared to 1983. Furthermore, after the age of 50 there was an increase in number of restored tooth surfaces. As regards secondary caries there was an increase for the 10- and 15-year-olds between 1983 and 1993. For all other age groups there were only minor differences. Generally restorations exhibited a high quality and 85-90% had no proximal overhangs. In 1973 this figure was about 60%. Concerning the frequency of tooth surfaces exhibiting plaque and gingival inflammation there was a considerable decrease from 1973 to 1983, but during the period from 1983 to 1993 there seems to be no improvement. In some age groups there was even a significant increase in plaque (15-year-olds) and gingivitis (3-, 5-, 15-, 20-, and 60-year-olds). The frequency of individuals with one or more periodontal pockets (> 4 mm) increased with age. In 1993 the bone level at the age of 40 years corresponded to the bone level at the age of 20 years in 1973. The percentage of endodontically treated teeth was lower in 1993 in all age groups than in 1973 and 1983. The percentage of endodontically treated teeth with periapical or juxtaradicular destructions was unchanged in all three studies. The comparison of the three studies from 1973, 1983, and 1993 shows that there has been a great improvement in oral health over this 20-year period. In 1993, however, the increasing number of decayed/filled tooth surfaces in the 15- and 20-year-olds and an increase in plaque and gingivitis in some younger age groups calls for special attention.

Adolescent↗
PubMed1994

A radiological inventory of possible sites for cylinder implants in edentulous regions of the jaws. An epidemiological study.

Implant treatment is nowadays requested as an alternative mode of treatment for both total and partial edentulousness. The purpose of the study was to assess the maximum number of possible implant sites in a group of adults. The study material comprised 579 persons divided into the age-groups 20, 30, 40, 50, 60 and 70 years. Based on radiological examination, the subjects were grouped according to Eichner's index. They comprised both dentate and edentulous individuals. Templates, marked with cylinder implants of different dimensions, were placed over edentulous regions. The possible number of cylinder-shaped endosseous implants that could be placed anterior to the second molar was assessed in relation to bone availability and anatomical structures. Gaps treated with fixed bridges were not registered. Altogether 1,048 presumptive fixture sites were marked, of which 78% in the age-groups 60 and 70 years. Eichner groups C 1-3, which comprised the edentulous persons, constituted 12% of the subjects and accounted for 57% of the possible number of implants. All edentulous mandibles and 70% of the edentulous maxillae were judged suitable for placement of implants. On average 5.5 and 5.8 sites were marked per edentulous maxilla and mandible, respectively. Groups B1-4 comprised 21% of the subjects and accounted for 37% of the implants. It is discussed that implant treatment in totally edentulous jaws will increase in relative terms in Sweden as in other Scandinavian countries, i.e. the percentage of edentulous jaws treated with implants will increase. In absolute terms, however, the treatment will probably decrease owing to a marked decrease in the number of edentulous individuals. The future need for implant treatment in the residual dentition will probably increase but it is difficult to predict by how much.

Adult↗
PubMed1991

Osseointegrated implants in the oral habilitation of a boy with ectodermal dysplasia: a case report.

The most characteristic oral feature in ectodermal dysplasia is hypodontia. Children and adolescents suffering from ectodermal dysplasia often need extensive and complicated prosthetic treatment. The development of techniques for osseointegrated implants offers new possibilities for the oral habilitation of these children. This paper describes the oral habilitation of a boy with severe ectodermal dysplasia and where Brånemark osseointegrated implants have been used as part of the treatment. The patient was seen at the dental department at the age of 1.5 years. Two conically-shaped upper incisors were at that time the only teeth that had erupted. The treatment was planned in a multidisciplinary odontological group involving paediatric dentistry, orthodontics, prosthodontics, oral surgery and maxillofacial radiology. At the age of 3 years it was verified that the boy had four primary teeth (53, 51, 61, 63) and four permanent teeth (16, 11, 21, 26). There were no teeth in the lower jaw. The alveolar ridges in the edentulous areas were low or missing. During the period 3-6 years of age the boy used an upper partial denture adapted to allow the mesial drift of the 16 and 26 teeth. At the age of 6 years, two Brånemark implants were inserted in the lower front-cuspid region. A specially designed overdenture for the lower jaw was constructed. The overdenture was retained in contact with the male attachments by two cuffs of heat-polymerized resilient silicone. Over the next 4 years the dentures were modified due to the eruption of permanent teeth and growth. However, only minor corrections were necessary concerning the retention system of the lower denture. The implants are well osseointegrated and stable and allow the boy to use a lower denture without any complications.

Anodontia↗
PubMed1990

An individual tooth wear index and an analysis of factors correlated to incisal and occlusal wear in an adult Swedish population.

The aim of the study was to introduce an individual tooth wear index and to use this index to investigate factors correlated to occlusal wear. The material consisted of 585 randomly selected dentate individuals from the community of Jönköping, Sweden, who in 1983 reached the age of 20, 30, 40, 50, 60, 70, or 80 years. The degree of incisal and occlusal wear was evaluated for each single tooth in accordance with criteria presented earlier. An individual tooth wear index, which made it possible to rank individuals in accordance with incisal and occlusal wear, was used as dependent variable to investigate factors related to incisal and occlusal wear. Of all factors analyzed, the following were found to correlate significantly with increased incisal and occlusal wear: number of existing teeth, age, sex, occurrence of bruxism, use of snuff, and saliva buffer capacity. Stepwise multiple regression analysis gave a total explanation factor of R2 = 0.41. It was also possible to distinguish well between groups of individuals with and without tooth wear by means of these factors.

Adult↗
PubMed1990

The effect of an airbrasive instrument on soft and hard tissues around osseointegrated implants. A case report.

A 40-year-old woman with natural teeth in the upper jaw and a complete lower denture was treated with six osseointegrated implants connected to a fixed bridge. On a recall visit 6 months posttreatment an air powder abrasive devise Prophy-Jet had been used to remove calculus and debris from the titanium abutments by the referring dentist. This resulted in an acute clinical reaction characterized by pain and submucosal emphysema. Furthermore, radiographs revealed break down of the marginal bone surrounding the fixtures. The treatment and follow-up period became long. These observations suggest that the use of air powder abrasive instruments is not the treatment of choice in the maintenance care of osseointegrated titanium implants.

Adult↗
PubMed1988

Prevalence and severity of incisal and occlusal tooth wear in an adult Swedish population.

The material consisted of 585 randomly selected dentate individuals from the community of Jönköping, Sweden, who in 1983 reached the age of 20, 30, 40, 50, 60, 70, or 80 years. The degree of incisal or occlusal wear was evaluated for each single tooth in accordance with the following criteria: 0 = no wear or negligible wear of enamel; 1 = obvious wear of enamel or wear through the enamel to dentin in single spots; 2 = wear of dentin up to one-third of the crown height; 3 = wear of dentin more than one-third of the crown height and/or excessive wear of tooth restorative material. Among the 20-year-olds 35% of the subjects had no or slight incisal or occlusal wear. The corresponding figures for the 30- to 80-year age groups were 20%, 32%, 18%, 14%, 26%, and 23%, respectively. For the age groups 20-80 years, the percentage of teeth with incisal or occlusal wear in accordance with criteria 1-3 was 13%, 20%, 16%, 24%, 23%, 23%, and 23%, respectively. Men presented more teeth with wear than women, the difference being significant for all age groups except the 20- and 60-year-olds. Among the 20-year-olds 6% had one or more teeth with wear scored 2. Among subjects aged 30 and 70 years 10% and 31%, respectively, showed tooth wear with score 2. Wear with score 3 was only found in 2% of the total population. There was an increase in the number of teeth with incisal or occlusal wear with age. With increasing age, there was also a change in distribution of wear within the dentition.

Adult↗
PubMed1988

Caries prevalence and distribution in individuals aged 20-80 years in Jönköping, Sweden, 1973 and 1983.

In 1973 an epidemiological study was performed in the community of Jönköping, Sweden. The study covered 1000 individuals, evenly distributed in the age groups 3, 5, 10, 15, 20, 30, 40, 50, 60 and 70 years. In 1983 a new cross-sectional study was carried out on the age-groups 3-80 years. The aim of the present study was to compare and analyse in detail caries prevalence and distribution in the age-groups 20-80 years at the examinations in 1973 and 1983. The subjects were examined clinically and radiographically regarding number of teeth, caries, restorations, etc. The mean number of teeth increased between 1973 and 1983, especially in the older age-groups. During the same period, the percentage of DFS decreased in the age-groups 20, 30 and 70 years, and was unchanged in the age-groups 40 to 60 years. There were only minor differences in DS in the respective age-group during the 10-year period. The distribution of subjects according to DFS showed that a large proportion of individuals in the age-groups 20 and 30 years had low DFS in 1983 as compared to 1973. For the age-group 40-years, the distribution was unchanged. For the 50, 60 and 70-year-olds, there was a change in distribution towards a larger proportion of individuals with high DFS values in 1983 as compared to 1973. The frequency distribution of individuals with primary and secondary carious lesions respectively was skewed, a small number of individuals having a high number of lesions in each age-group.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1987

Occlusal force pattern during mastication in dentitions with mandibular fixed partial dentures supported on osseointegrated implants.

The occlusal force pattern during chewing and biting was studied in eight edentulous patients whose dentitions had been restored with mandibular bilateral posterior two-unit cantilever fixed prostheses supported on osseointegrated titanium fixtures and occluding with complete maxillary dentures. The chewing pattern was comparable to that reported for subjects with complete healthy dentitions or with tooth-supported cross-arch fixed partial dentures. However, during chewing and swallowing the voluntary capacity of the jaw-closing muscles was used to a much greater extent. Contrary to reports for cantilevers in tooth-supported cross-arch unilateral posterior two-unit cantilever fixed partial dentures occluding with natural teeth, the posterior cantilever segments in the present fixture-supported cantilever prostheses occluding with complete dentures regularly exhibited the largest local forces. Despite this, material failures of this type of fixed prostheses are rare, as demonstrated in long-term follow-up studies.

Adult↗
PubMed1986

In situ characterization of the inflammatory cell infiltrates of hyperplastic denture stomatitis.

Cryostat sections from 14 surgical specimens were examined to determine whether selected factors of the immune response related to histopathological reactions are present in the palatal mucosa affected by hyperplastic denture stomatitis. By means of various immunological techniques the presence of IgG, IgA, IgM, complement factor C3c, receptors for the Fc region of IgG (FcR) and for complement factor C3b (C3bR), T lymphocytes, and macrophages were studied. The inflammatory infiltrate was mainly located in the papillary part of the lamina propria. IgG, IgA, and IgM appeared both in plasma cells and intercellularly. FcR, C3bR, and T lymphocytes were present in the areas with inflammatory cell infiltrate. Macrophages were found in the papillary part of the lamina propria and within the epithelium. The immunological response in the mucosa affected by denture stomatitis was in many respects similar to that of marginal and apical periodontitis. We conclude that hyperplastic denture stomatitis is a complex inflammatory lesion showing elements of both humoral and cellular immune responses.

Antibody Formation↗
PubMed1986

Oral health of individuals aged 3-80 years in Jönköping, Sweden in 1973 and 1983. I. A review of findings on dental care habits and knowledge of oral health.

The aim of the present study was to present data from dental care habits and knowledge of oral health in two cross-sectional studies carried out in 1973 and 1983. A random sample of approximately 1000 individuals evenly distributed in the age groups 3, 5, 10, 15, 20, 30, 40, 50, 60 and 70 years was studied for each of these two years. In the 1983-year examination 80 individuals 80 years of age were also included. All subjects were inhabitants of the community of Jönköping, Sweden. A questionnaire about dental care habits and knowledge was used in combination with a clinical and radiographical examination. The participants answered 23-101 questions. The same questions were raised in 1973 and 1983. For most age groups more then 80 per cent visited a dentist yearly in 1983. This yearly attendance was higher than that for 1973. In the 20-year-old group 14 per cent of the individuals received dental care in the PDS in 1973 compared to 63 per cent in 1983. The main reason to visit a dentist in 1973 was by the patient's own initiative while in 1983 the appointments were based on the dentist's initiative. The number of subjects that felt discomfort in connection with a visit to the dentist had decreased between 1973 and 1983. Knowledge about the etiology of caries had increased between 1973 and 1983 was not the case for gingivitis and periodontitis. An increase had occurred in toothbrushing frequency and the use of toothpicks and disclosing tablets but this between 1973 and 1983. In 1983, 98 to 93 per cent of the subjects in the age groups 10-30 years had been exposed to topical fluorides. The corresponding figure for 30-year-olds in 1973 was 1 per cent. It is obvious that during the period 1973 to 1983 there has been an increase in dental attendance, knowledge of dental diseases, oral health and the use of preventive measures.

Adolescent↗
PubMed1986

Oral health of individuals aged 3-80 years in Jönköping, Sweden, in 1973 and 1983. II. A review of clinical and radiographic findings.

The aim of this study was to present data from clinical and radiographic examinations on oral health in two cross-sectional studies carried out in 1973 and 1983. A random sample of approximately 1000 individuals, evenly distributed in the age groups 3, 5, 10, 15, 20, 30, 40, 50, 60 and 70 years was studied for each of these two years. In the 1983-year examination 80 individuals, 80 years of age, were also included. All subjects were inhabitants of the community of Jönköping, Sweden. The clinical and radiographic examination assessed edentulousness, removable dentures, number of teeth, caries, restorations and overhangs, gingival and periodontal status, oral hygiene and calculus, endodontic treatment and periapical status. A reduction in number of edentulous individuals by 25% was recorded between the two examinations. This was matched by an increase in the mean number of teeth, mainly of molars. The largest difference in mean number of teeth between the 1973 and 1983 examinations was found for the 70-year-olds. These were 8.5 and 11.8 teeth respectively. The younger age groups showed an increase in the proportion of individuals free from caries and restorations. In 1973 the caries-free proportions were 35% for 3-year-olds and 9% for 5-year-olds. In 1983 these values had improved to 70% and 29% respectively. Corresponding to this trend the number of decayed tooth surfaces was lower in 1983. Fewer filled tooth surfaces were present 1983 compared with 1973 for the age groups 10, 15, 20 and 30 years but higher for the age groups 5, 50 and 60 years and unchanged for the remaining groups. For the younger age groups the overall reduction in DFS was about 50% but this increased to 90% for buccal and lingual surfaces. Both secondary caries and overhanging restorations had decreased in the 1983 group for all ages. At least 75-86% of restorations were without overhangs in 1983 compared to 47-65% in 1973. Gingival health had improved over the 10-year period. Sites with plaque and calculus and gingival units exhibiting gingivitis had all decreased in frequency by 1983. Buccal surfaces showed the greatest improvement. The frequency of individuals with one or more periodontal pockets (greater than or equal to 4 mm) increased with age but was of the same distribution in 1983 as in 1973.(ABSTRACT TRUNCATED AT 400 WORDS)

Adolescent↗