Biomedical subjects

A Frykholm

Publications and source records attributed to A Frykholm.

14 recordsLinked to original sources

PubMed1998

Five-year prospective follow-up report of the Astra Tech Dental Implant System in the treatment of edentulous mandibles.

This report of the 1st 2 prospective studies using the Astra Tech Implant System and fixed detachable bridges for rehabilitation of mandibular edentulism, presents clinical and radiographic data at the 5-year follow-up. The original material comprised 109 subjects, 56 of whom had been included in the original study, using the 1st generation Astra Tech Implant. Two subjects were excluded and the 3-year follow-up report was based on the remaining 54 subjects and 310 fixtures. After some minor changes to the fixture and the abutment, the 2nd generation Astra Tech Implant was used in 53 subjects and 308 fixtures. In all 16 subjects were lost to follow-up and the 5-year results are based on the remaining 91 subjects with 517 fixtures in function: 5 fixtures were lost due to mobility at abutment installation and during the 1st year, 2 fixtures were removed due to pain, and after 4 years in situ 1 fixture failed. As no clinical or radiographic differences were obvious in the annual registrations of the 2 studies the results have been combined. The fixed bridges were removed at 3 and 5 years to test each fixture and none was mobile. The cumulative fixture survival rate at 5 years was 98.7% and the bridge survival rate was 100%. Of the sites 82% were plaque free, and 96.8% showed no signs of inflammation. Over the 5-year period after bridge insertion, i.e. from baseline registration, there was only minor deterioration in marginal bone levels as measured on standardized intraoral radiographs: the mean differences in mm and standard deviations (SD) were -0.09 (0.27) in the 1st year, -0.20 (0.40) in the 3rd year, and -0.26 (0.53) in the 5th year. According to the stringent clinical and radiographic criteria by Albrektsson and co-workers, the successful treatment outcome and the survival rate in 91 subject over 5 years, indicates that the Astra Tech Dental Implant System with fixed detachable bridges is an appropriate method for rehabilitation of mandibular edentulism.

Adult↗

PubMed1993

A clinical and radiological two-year follow-up study of maxillary overdentures on osseointegrated implants.

In order to satisfy the need to restore the aesthetics, phonetics and comfort and to facilitate optimal hygiene procedures, 20 edentulous patients were treated with a new concept of overdenture therapy on implants and modum Brånemark. After 24 +/- 3.5 months the patients were re-examined. They were asked to answer a questionnaire and use a Visual Analogue Scale (VAS) to give their opinion on the prosthetic treatment. The results indicate that an implant-retained overdenture in the maxilla with this design can satisfy the patients needs in aesthetics, phonetics and comfort and can facilitate oral hygiene measures.

Aged↗

PubMed1992

A 3-year clinical study of Astra dental implants in the treatment of edentulous mandibles.

A prospective study for the treatment of mandibular edentulism using the new Astra dental implant system was conducted on 54 patients. The clinical performance of 310 implants was monitored over 3 years. The survival rate was 100% for the prostheses and 98.1% for individual implants. Four implants failed during the first 3 months after placement, one was retained as a "sleeper," and two more were removed because of persistent discomfort. Both resorption and deposition of mandibular marginal bone were observed. Bone changes from baseline to the end of the first year ranged from -0.4 to +1.0 mm (median 0.00), from the first to the third year from -0.8 to +0.6 mm (median 0.04), and over the 3 years ranged from -1.1 to +1.0 mm (median 0.01). No marked mean bone resorption was observed during the first year compared to the two following years. A significant gain in marginal bone level was recorded in males, but in females the level was unchanged. There were no serious inflammatory reactions in the surrounding soft tissues during the 3-year follow-up period.

Adult↗

PubMed1991

Rapid orthodontic extrusion of crown root and cervical root fractured teeth.

This study concerns the relapse tendency and extent of root resorption in 33 extruded non-vital crown root fractured or cervical root fractured teeth in 32 patients 10-20 years old. They constitute all orthodontically extruded teeth at the Orthodontic or Pedodontic Departments, Eastman Institutet, Stockholm (1982-1987). A simple extrusion mechanism exerted a force of 60-70 p along the root axis of the tooth. An extrusion of 2-3 mm was obtained in most patients; the most extreme effect was 6 mm. In 16 patients the extrusion was achieved within 3 weeks, in 12 it lasted for 4-6 weeks and in 5, 7-9 weeks. The treatment was more complicated in the lower jaw. After the extrusion, a fibrotomy was done and in most patients also a gingival recontouring to create an optimal relation between the gingiva and the margin of the restoration. Periodically identical radiographs were taken immediately before and after the extrusion, after 3 months and after 1 year. A minor relapse, about 0.5 mm, was observed in 3 patients. Limited root resorption was found in 6 teeth and severe in only 1. The resorptions did not progress in the following 2 years of observation.

Adolescent↗

PubMed1987

Clinical evaluation of intra-alveolar transplantation of teeth with cervical root fractures.

Transverse and oblique intra-alveolar fractures constitute a major therapeutic problem, particularly in young dentitions. Very few treatment alternatives apart from extraction have been available. This report is a clinical and roentgenological evaluation of a series of intra-alveolar transplantations which were carried out on 56 teeth with complicated crown-root fractures. The patients ranged in age from 9-33 years and were observed over a period of 4 years. Of the 8 teeth which had to be extracted due to further traumatic/prosthetic complications, 7 were retained for histologic examination. All teeth exhibited successful healing without ankylosis. In 12 per cent of the cases, unhealed resorptions could be observed within the apical area. Two to nine weeks post-operatively, endodontic and/or prosthetic treatment could be carried out, after which the teeth have continued to function well in terms of both aesthetics and performance. No negative effects in the adjacent teeth have been observed. Cases with multiple crown-root fractures and one case with internal resorption have been described. The intra-alveolar transplantation technique provides not only an alternative method of treatment, but also an opportunity for deep root injuries to be diagnosed.

Adolescent↗

PubMed1984

Surgical treatment of ankylosed and infrapositioned reimplanted incisors in adolescents.

A method for preserving the alveolar ridge of ankylosed and infrapositioned incisors and improving conditions for a subsequent prosthetic therapy is described and evaluated clinically and radiographically. The method involves removal of the crown and root filling from the root, which is retained and covered with a mucoperiosteal flap. Clinically, there were no postoperative complications and after the follow-up a satisfactory prosthetic restoration was performed in all cases, regardless of the degree of infraposition before treatment. Radiographically, no pathologic changes were observed apart from a continuous resorption and replacement of lost root substance by bone. Alveolar bone level shifted only slightly between postoperative and 12-month follow-up radiographs, in a majority of cases in a coronal direction.

Adolescent↗

PubMed1983