Publications by authors named "Karl O Karlsson"

Lumbar disc herniation (LDH) is common and often debilitating. Microdiscectomy of herniated lumbar discs (LDHsurg) is performed on the most severe cases to resolve the resulting sciatica. Here we perform a genome-wide association study on 4,748 LDHsurg cases and 282,590 population controls and discover 37 highly correlated markers associating with LDHsurg at 8q24.

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Introduction: The purposes of this study were to analyze long-term changes in malocclusion traits and to compare the development in orthodontically treated and untreated subjects.

Methods: The sample comprised 308 adolescents in the intermediate, late mixed, or early permanent dentition who were examined clinically at the ages of 8 to 17 years and again 25 years later. The treated subgroup of 58 subjects had received orthodontic treatment with fixed or removable appliances or both.

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Objective: The objective of this study was to produce a standardized medical risk-related history (MRRH) in order to identify the medically compromised patient (MCP) attending the general dental practitioner for treatment, to develop such a history (EMRRH), and to validate it in dental practices in 10 European countries.

Study Design: The Dutch MRRH, adapted to allow for legal and cultural differences of the participating countries was introduced. After consensus and repeated testing, the questionnaire was validated.

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Introduction: The objectives of this study were to record the extent of orthodontic treatment and the prevalence of occlusal anomalies in an adult sample in Iceland.

Methods: The study was based on a random sample of 829 subjects, 342 men and 487 women, aged 31 to 44 years, who completed questionnaires about their orthodontic treatment experiences and were available for clinical examination.

Results: Complete dentitions in both jaws were present in 52.

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In this study, we examined the prevalence of specific (dental) phobia among a sample of the Icelandic population. In addition to dental anxiety we explored factors that could be related to dental anxiety. In the period 1972-73, a stratified sample of 1641 schoolchildren in Reykjavík was selected for a study on malocclusion, dental maturation and other factors.

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