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Jawbone Loss Caused by Periodontitis Predates Rheumatoid Arthritis

by Anjali Aryamvally on December 3, 2017 at 1:46 PM
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Jawbone Loss Caused by Periodontitis Predates Rheumatoid Arthritis

Jawbone loss caused by periodontitis predates the onset of rheumatoid arthritis, says study by a research team from Umeå University in Sweden published in the journal Arthritis & Rheumatology. The research also shows a causal relationship between jawbone loss and elevated levels of the bone resorption inducing molecule RANKL in the blood.

Jawbone loss caused by inflammation is characteristic to both periodontitis - a disease leading to tooth loss - and rheumatoid arthritis. Despite differences in what causes the inflammation in periodontitis or rheumatoid arthritis, it has now been established that there is a correlation between the two.

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"For example, it's known that individuals with rheumatoid arthritis to a great extent show symptoms of tooth loss than individuals with healthy joints. It's also been known that treatments aimed at periodontitis also ease symptoms from joints in individuals with rheumatoid arthritis. What's not been proven so far, however, is a causal relationship between the two," says Pernilla Lundberg, senior lecturer at the Department of Odontology at Umeå University, and one of the researchers behind the study.

In a collaboration, Pernilla Lundberg and Solbritt Rantapää-Dahlqvist, who is a researcher at the Department of Public Health and Clinical Medicine at Umeå University, have analysed the prevalence of jawbone loss in dental x-rays of individuals with rheumatoid arthritis. The X-rays were performed before arthritis symptoms had developed, and were compared with X-rays from matching controls. All participants in the study had on numerous occasions donated blood to the Medical Biobank Northern Sweden Health and Disease Study. Dental X-rays had been retrieved from the treating dentists.
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The results, now presented in the journal Arthritis & Rheumatology, show for the first time that the individuals who later develop rheumatoid arthritis to a greater degree show signs of jawbone loss. Individuals with rheumatoid arthritis also to a greater extent develop jawbone loss over time. Among the individuals who later developed rheumatoid arthritis, the greatest degree of bone loss was detected in individuals who also showed elevated levels of the bone resorption inducing molecule RANKL in the blood.

"As far as we know, no one has previously been able to show that individuals who later develop rheumatoid arthritis have a higher degree of jawbone loss before showing any symptoms of arthritis," says Solbritt Rantapää-Dahlqvist.

"Our results indicate a causal relationship between periodontitis and rheumatoid arthritis. Nevertheless, further clinical studies and studies on basic mechanisms are needed in order to prove the existence of a causal relationship with certainty."



Source: Eurekalert
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