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Biomedical subjects

K Oikarinen

Publications and source records attributed to K Oikarinen.

At least 19 recordsLinked to original sources
PubMed1992

Different patterns of condylar fractures: an analysis of 382 patients in a 3-year period.

Three hundred eighty-two patients with 443 condylar fractures, accounting for 52.4% of all mandibular fractures, were given diagnoses and treated in our department between 1987 and 1989. A high proportion of the fractures (44%) were caused by interpersonal violence, followed in incidence by falls (29%) and road traffic accidents (21%). The type of condylar fracture seems to be influenced directly by its cause. Severe fractures in which the condyle was dislocated out of the glenoid fossa resulted more often from falls (22%) and road traffic accidents (26%) than from violence (8%). Fractures caused by violence showed a uniform type characterized by a subcondylar location and nondisplacement or deviation at the fracture line. A relatively large number of patients (56, 15%) were considered to have an indication for open reduction of the fracture.

Accidental Falls↗
PubMed1992

Dental health behavior in fathers of young families in Finland.

The purpose of this study was to examine dental health behavior in young fathers by means of a questionnaire for subjective evaluation of dental status, frequency of caries and visits to the dentist. Cariogenic diet was estimated by the consumption of sweets, confectionary and soft drinks. The participation rate 18 months after the birth of the family's first child was 73.1%. The mean age of the respondents was 28.1 yr (range 17-49; SD 4.6). When background factors were considered, it was observed that cariogenic diet was more often mentioned by participants from the lower social groups. The standard of the wife's knowledge level was an important indicator of dental care behavior in the fathers. If the wife's knowledge level was high, the father assessed the future condition of his child's teeth as good.

Age Factors↗
PubMed1992

Mobility and percussion sound of healthy upper incisors and canines.

In order to evaluate the correlation between mobility and percussion sound, 126 upper incisors and canines in 21 student volunteers were measured by means of the Periotest (Siemens), by evaluating the percussion sound subjectively and by analyzing its spectrum. The attenuation time and frequency of the sound were measured for each tooth. A logical mobility and percussion sound existed in accordance with the sizes of the teeth. Spearman correlation coefficients close to 1.00 were noted in individual cases between the Periotest and the three other tests describing the percussion sounds.

Adult↗
PubMed1992

Rigidity of various fixation methods used as dental splints.

Horizontal and vertical rigidity of teeth fixed with seven types of dental splints were evaluated by two tooth mobility measuring devices. Altogether 21 dissected sheep mandibles including soft tissues were used for the experiments in which Fermit, flexible wire-composite, Kevlar, Fiber, Protemp, rigid wire-composite and Triad Gel splints were applied to four incisors. The mean rigidity of the central incisors within the splint was measured by means of Mühlemann periodontometer (horizontal mobility) and Periotest (horizontal and vertical mobilities). Mobility values of teeth before splinting were used as covariants and the values with the splints were illustrated as adjusted mobility. Statistical significance between the rigidity of various splints was analyzed by an unpaired t-test. It was shown that the most rigid splints both in horizontal and vertical directions were Triad Gel, rigid wire-composite and Fermit splints. Kevlar and Fiber splint allowed more horizontal movement than other splints. Protemp and flexible wire-composite splints proved to produce adequate lateral support for the fixed teeth and allowed vertical flexibility which is experimentally known to improve periodontal healing of luxated teeth.

Acrylic Resins↗
PubMed1992

Toxic effects of various retrograde root filling materials on gingival fibroblasts and rat sarcoma cells.

The aim of this in vitro study was to evaluate the effect of amalgam, glass ionomer, composite and titanium on the growth of gingival fibroblasts (GF) and rat sarcoma cells (UMR) in vitro. The cells were either obtained from gingival biopsies taken during deliberation of unerupted canines (GF) or were of commercial origin (UMR). Equal numbers of cells were placed on culture dishes and incubated for a period of two weeks with the freshly prepared test materials. The cultures were photographed through a light microscope after 7 days incubation and finally counted after 14 days. It was shown that the proliferation of gingival fibroblasts was less disturbed by titanium, being approximately 96% of the control value (cell cultures without test particles), followed by composite, amalgam and glass ionomer (61%, 49% and 35% of the control value respectively). The number of UMR cells after 14 days incubation with the various materials was 76% of the control value with titanium, 12% with composite and 5% with both amalgam and glass ionomer. Inhibition of cell growth (UMR) around the test particles was most prominent around amalgam and glass ionomer, followed by composite and titanium. These effects were noted only with freshly prepared components however, so that the toxic reaction was less pronounced or minimal in a second incubation using the same particles sterilized in between. The results demonstrated that potential retrograde root filling materials have a variable toxic effect on gingival fibroblasts and rat sarcoma cells. The fact that the influence on proliferation disappeared when the test was performed with materials already tested once may be of clinical importance when estimating the biocompatibility in vivo.

Adolescent↗
PubMed1992

Frequency of alcohol-associated mandibular fractures in northern Finland in the 1980s.

In order to evaluate the frequency of alcohol-associated mandibular fractures, information on patients treated and diagnosed at a University Hospital and Dental Institute in northern Finland between 1981 and 1990 was analysed. Altogether, 117 male patients (out of 239) and 23 female patients (out of 78) were under the influence of alcohol at the time of accident. The annual risk for men receiving a mandibular fracture under the influence of alcohol (odds ratio) varied between 0.6 and 6.6, compared with female patients. More alcohol-associated mandibular fractures occurred in late summer and autumn and fewer in spring. Patients suffering mandibular fractures at weekends were more often under the influence of alcohol than those injured on weekdays. There seemed to be a tendency for the proportion of alcohol-associated mandibular fractures to decrease towards the end of the decade.

Alcoholic Intoxication↗
PubMed1991

Gigantiform cementoma affecting a Caucasian family.

A Caucasian family is presented in which two out of three children showed lesions resembling gigantiform cementoma clinically, radiologically and histopathologically. Both affected children had swellings of the alveolar crest, caused by large, lobular, radio-opaque masses in all four quadrants of the jaws. Histologically, cementum-like masses were surrounded by inflamed fibrous connective tissue. There was evidence indicating that the late father had similar lesions which became malignant following radiation therapy.

Adolescent↗
PubMed1991

Complications of third molar surgery among university students.

The authors analyzed complications during and after 145 consecutive operative removals of mandibular third molars performed on 109 healthy university students in Finland. The operations were all performed by the same oral surgeon under similar conditions and with similar postoperative procedures. The rate of intraoperative complications was 9%. All complications could be taken care of during the operations, and all the postoperative complications were reversible. Swelling was the most common postoperative complication and was related to the length and difficulty of the operation. Trismus at the control visit (6th postoperative day) was also related to the length of the operation. Mandibular lateral movement was more restricted to the nonoperated than to the operated side. Alveolitis sicca dolorosa (ASD) was diagnosed as true ASD in 5% of the cases and as nonspecific ASD in 15% of the cases.

Adult↗
PubMed1991

Postoperative pain after mandibular third-molar surgery.

The pain experienced after 116 operative removals of mandibular third molars was studied in a homogeneous group of patients consisting of 85 healthy university students. Pain was recorded daily on a visual analogue scale during the postoperative week. It was shown that preoperative inflammation and the difficulty and duration of the operation increased the intensity of pain.

Adult↗
PubMed1991

The Finnish family competence study: dental oral self-care behaviour and awareness of gingivitis/calculus in fathers of young families.

The purpose of this study was to examine oral self-care behaviour and the prevalence of gingivitis and dental calculus in fathers of young families using a questionnaire. The participation rate at 18 months after the birth of the first child was 73.1%. The mean age of the respondents (n = 917) was 28.1 years (range 17-49; SD 4.6). Dental health and dental care were assessed by asking about the existence of gingivitis and dental calculus. Oral hygiene habits were analysed by asking about the use of toothpicks and dental floss and the regularity of toothbrushing. Gingivitis and dental calculus were found to be related to age and to educational and occupational status. The older respondents used dental floss and toothpicks more often and brushed their teeth more regularly than those in the younger age group. When the wife's knowledge was poor, the respondent's oral hygiene habits were also poor. If the wife's knowledge level was good, the young father's oral hygiene was good, too. Parents transfer their own oral health care habits to their children. Respondents whose parents had a high socio-economic status exhibited good oral hygiene habits. The Maternity Health Care Clinic and Well-Baby Clinic network can also influence oral health care habits. The relevant parts of general prophylactic guidance given at these clinics should be included in dental health programmes.

Adolescent↗
PubMed1990

Hereditary gingival fibromatosis associated with growth hormone deficiency.

A case report of gingival fibromatosis in association with growth hormone (GH) deficiency due to a lack of growth hormone releasing factor (GRF) is presented. The girl is the youngest member of a family of eight children, five of whom lack the same hormone and have or have had similar gingival enlargements. After the growth hormone deficiency had been diagnosed and hormone substitute administered the dental age of the girl presented came closer to that of her age and sex-matched controls but did not reach the corresponding values even though the teeth were exposed by excising the overgrown gingiva. Test fibroblasts cultured from the overgrown gingiva proliferated at a slower rate than those cultured from age-matched controls. Total RNA was extracted from the test and three control fibroblasts and examined by Northern hybridisation using cDNAs for pro alpha 1(I) and pro alpha 1(III) chains. The amount of type I and III procollagen mRNAs were lower in the test fibroblasts as compared to the controls.

Age Determination by Teeth↗
PubMed1990

Replacing resorbed maxillary central incisors with mandibular premolars.

A case report is presented on autotransplantation of a lower premolar into the upper central incisor area. A traumatized upper central incisor lost because of external root resorption was replaced by a premolar transplant taken from a crowded mandibular arch. The transplant showed excellent adaptation and the periapical inflammation noticed a few years after the operation was treated successfully with apicectomy.

Bicuspid↗
PubMed1990

Prognosis of permanent teeth in the line of mandibular fractures.

A total of 45 mandibular fracture patients with 54 teeth in the fracture line were evaluated retrospectively. One tooth in the fracture line was lost in the accident, 6 were extracted later and 47 could be saved (87%). At the follow-up examination 38% of the teeth were diagnosed to have pulp necrosis, which was found more frequently in the older patients and in cases in which the time elapsing between the injury and the follow-up was longer. Pulp necrosis was also more frequent in cases in which the fracture line ran through the apex or dislocation of the fracture parts existed after the injury.

Adolescent↗
PubMed1990

Tooth splinting: a review of the literature and consideration of the versatility of a wire-composite splint.

The principles of tooth luxation splinting have been changed since the animal and human tests conducted in the early 1970s showed that masticatory stimulus promotes healing of luxated teeth and normally exerted occlusal forces are able to prevent and eliminate small resorption cavities on the root surface. It has also been shown that fixation of only one week is enough to achieve the clinical healing of repositioned teeth. Apart from esthetic and hygienic components, present-day demands on tooth fixation techniques also include ease of construction and removal and the use of devices which allow slight movement of the fixed teeth. This paper presents the history of tooth splinting, our present-day knowledge of the subject, and introduces various splinting techniques. The wide range of indications for a flexible wire-composite splint are analyzed more thoroughly.

Acrylic Resins↗
PubMed1989

Treatment of mandibular fractures. Need for rigid internal fixation.

The treatment of 200 mandibular fractures was evaluated retrospectively with special reference to the need for rigid internal fixation (AO-plating), as indicated by the ASIF organization. It was shown that the treatment was most typically intermaxillary fixation (50%) followed by Gunning-type splints (17%), wire (16%) and plate (6%) osteosynthesis, while 11% received no active treatment. Complications during splinting were most common among patients treated by osteosynthesis via an extra-oral approach. Most of the fractures (73%) were estimated to be anatomically suitable for AO-plating. One fifth (22%) had relative indications for the use of rigid internal fixation, and 59% had absolute indications, mostly due to simultaneous condylar and corpus (body) fractures or due to fractures in the angle region.

Adolescent↗
PubMed1989

Verapamil-induced gingival overgrowth: a clinical, histologic, and biochemic approach.

Verapamil-induced overgrowth was most prominent in the anterior regions and interproximal areas associated with plaque retention. Despite periodontal therapy, overgrowths recurred 1 month after gingivectomy. Discontinuation of the drug resulted in regression of the overgrowths. Histologic findings showed inflamed connective tissue covered by an acanthotic, thickened oral epithelium with long rete pegs containing dyskeratotic pearls. The proliferation rate and protein and collagen production of fibroblasts from the overgrowth sites were markedly lower than in the control cells cultured from healthy gingiva. Incubation of fibroblasts in the presence of verapamil reduced protein and collagen synthesis.

Adult↗