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Biomedical subjects

O Kjellman

Publications and source records attributed to O Kjellman.

At least 19 recordsLinked to original sources
PubMed1998

Do healing abutments influence the outcome of implant treatment? A three-year multicenter study.

STATEMENT OF THE PROBLEM: It is not known if healing abutments replaced subsequently with permanent abutments adversely affect the soft tissues and marginal bone levels around dental implants. PURPOSE: This study evaluated the mucosal condition and marginal bone levels 3 years after placement of healing abutments in patients provided with fixed prostheses supported by Brånemark implants. MATERIAL AND METHODS: Data were analyzed retrospectively from 117 patients treated at five centers in which 318 healing abutments were placed on maxillary and 112 on mandibular implants. A prospective 3-year appraisal with a specific protocol assessed the response of mucosal cuffs and marginal bone levels surrounding surviving implants. RESULTS: Exchange of abutments did not affect expected survival rates of implants (94% maxilla, 99% mandible) or produce mean levels of marginal bone loss greater than anticipated for the system. Mean marginal bone levels correlated significantly with the jaw. Most patients achieved good oral hygiene and favorable peri-implant soft tissue health. CONCLUSION: No evidence was found to suggest abutment exchange adversely affects outcome of implant treatment.

Adolescent↗
PubMed1995

Jaw fractures in the county of Stockholm. A comparative study with an interval of 10 years.

The material comprised patients from the Stockholm region with jaw fractures during 1978-1980 and 1988-1990. The study showed that there had been a decrease of jaw fractures in Stockholm during the two periods. Some of the findings indicated that the injuries had become more serious while this was contradicted by others. There was no conclusive evidence of a significant increase in either the number or severity of injuries due to violence or traffic accidents. On the contrary the study indicated that the decrease of jaw fractures had continued.

Accidental Falls↗
PubMed1989

Metal release from plates used in jaw fracture treatment. A pilot study.

This study investigated the occurrence of corrosion associated with the use of metallic implants to stabilize jaw fractures. Three different types of plates, Co-Cr and Ni-Cr alloys and Titanium, were connected in vivo to the mandibular bone surface of monkeys (Cercopithecus aethiops). The animals were killed after 3 and 6 months. The mucous membrane and bone tissue were analysed for concentrations of Co, Cr, Ni, Mo, Al, and Ti by atomic absorption spectrophometry and a radiochemical neutron activation technique. With the exception of Ti, higher concentrations of all the above elements were found in the tissue near the implants when compared with contralateral controls. However, no signs of corrosion, macroscopic or microscopic, were observed on the surface of the implants.

Animals↗
PubMed1989

Jaw fractures in the county of Stockholm (1978-1980). Jaw fractures in children and adolescents.

Jaw fractures are less frequent in children than in adults. Very few studies exclusively on jaw fractures in children have been reported. From an investigation earlier published about jaw fractures in the country of Stockholm during the years 1978, 1979 and 1980 the authors have selected all cases of jaw fractures in children and adolescents below the age of 20. One hundred and seventy-one patients were studied, 128 boys and 43 girls. The ratio between boys and girls was 3:1. The material was separated into 4 age groups: 0-5, 6-10, 11-15 and 16-20 years. Sixty percent of the fractures were found in the older age groups. The majority of the injuries (62%) occurred during the period May-September, mostly on Fridays and Saturdays, in the younger groups in day time, in the older group during the evening. Fractures due to falling and playing dominated in the younger age groups, but decreased with age. Even if all bicycle traffic accidents were excluded, this vehicle caused 31% of all play and sporting accidents. The relatively percentage of traffic accidents increased steadily from 17 to 42% in the age groups. In the oldest age group violence exceeded traffic as the dominating cause. Le Fort fractures were not found in the younger groups, were fractures of the mandibular condyle and maxillary alveolar process dominated. An erupted tooth in the fracture line was registered in 43% of the cases. Most patients received outpatient treatment.

Accidents↗
PubMed1989

Jaw fractures in the country of Stockholm (1978-1980). Injury dynamics--etiologic factors in relation to anatomic site of fracture.

This paper presents a retrospective review of jaw fractures sustained by 795 individuals in the county of Stockholm from 1978-80. The material comprised 904 mandibular and 249 maxillary fractures, a total of 1.153 fractures. The present part of the study concerns the relationship between etiologic factors and fracture location. Single fractures were noted in 43% of the mandibular fractures and in 4% of the maxillary fractures. The region most frequently fractured was the mandibular condyle (19% of all fractures). Violence was the etiologic in 42% of the total number of fractures and 47% of mandibular fractures. Compared to earlier reports, this seems to represent an increase over the last decades and probably reflects a general trend towards greater incidence of violence in society. Jaw fractures caused by traffic accidents accounted for 25% of all fractures and have decreased, probably as a result of the safety belt law of 1975 and better traffic security reforms. However, the severe Le Fort III fractures, combined with unconciousness and neurological injuries, are mainly the result of on traffic accidents. Falls accounted to 23% of the fractures, mostly localized to the mandible (81%).

Accidents↗
PubMed1988

Osseointegrated oral implants. A Swedish multicenter study of 8139 consecutively inserted Nobelpharma implants.

Fourteen Swedish teams outside the University of Gothenburg, each with minimally three years' experience in the Nobelpharma osseointegrated implant participated in a retrospective multiclinic study. The total number of consecutively inserted implants at the 14 clinics was 8139. The outcome of every implant was reported and all implant failures, irrespective of when they occurred, were published. The success criteria included absence of implant mobility, absence of radiolucent zones on x-rays, and an annual bone loss after the first year of less than 0.2 mm. In the mandible 334 implants were followed for five to eight years, with only three failures, for a success rate of 99.1%. In the maxilla 106 implants were followed for five to seven years, with a success rate of 84.9%. In irradiated and grafted mandibles, 56 implants were inserted and none was lost during a follow-up of up to five years. In the irradiated maxilla there were 16 implants inserted with three reported failures and in the grafted upper jaw 71 implants were inserted with 12 failures. The proportions of mandibular and maxillary sleeping implants were 0.8 and 0.3%, of patient drop-out implants 0.3 and 0.6%, and of patient death implants 0.9 and 1.2%, respectively. It was concluded that the osseointegrated implant, if inserted according to the guidelines of Brånemark, results in a very high degree of clinical success, thereby meeting any published oral implant success criteria.

Clinical Trials as Topic↗
PubMed1987

Indications for surgical removal of the mandibular third molar. Study of 2,630 cases.

Indications for surgical removal of 2,630 impacted mandibular third molars were studied. The investigation comprises all operations during a period of 12 months and was carried out at 4 departments of oral surgery within the Stockholm area. The average age of the patients was 27 years. Pathological changes were seen in about 60% with pericoronitis as the most common diagnosis. Root resorption of the adjacent molar was seen in 4.7% and cysts in 4.5%. Orthodontic indications were noted in 10.7%. In about 20% of cases, prophylactic indications (i.e. complications were predicted of tooth remained) were given as the reason for extraction. It was stated that the indications were in some cases uncertain. Further studies of relevant factors are therefore well motivated.

Adolescent↗
PubMed1986

Long-acting local anaesthetics in oral surgery. Clinical evaluation of bupivacaine and etidocaine for mandibular nerve block.

2 long-acting local anaesthetics, bupivacaine and etidocaine, have been compared to lidocaine with regard to effect during surgical removal of impacted mandibular third molars and effect upon the immediate postoperative pain. It can be concluded from this study that both bupivacaine and etidocaine as well as lidocaine were highly effective and without significant difference with regard to pain blocking during surgery. Both long-acting solutions were significantly superior to lidocaine in providing an extended duration of postoperative pain control. Comparing the 2 long-acting solutions, patients in the bupivacaine group had a significantly longer pain-free period than patients in the etidocaine group.

Acetanilides↗
PubMed1985

Endosseus titanium implants in extraction sockets. An experimental study in monkeys.

In a series of monkeys, titanium implants (Xenodent) were installed in the sockets of mandibular incisors. The animals were sacrificed 7 and 12 weeks after the implantations. The healing was studied by histological and microradiographical techniques. A gradual osseointegration free from adverse interference could be noticed.

Alveolar Process↗