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Comment & Response
May 14, 2014

Hemoglobin A1c Levels Among Patients With Diabetes Receiving Nonsurgical Periodontal Treatment

Author Affiliations
  • 1Periodontal Research Group, University of Birmingham, Birmingham, England
  • 2Department of Periodontology and Oral Medicine, University of Michigan, Ann Arbor
  • 3Department of Oral Biology and Microbiology, State University of New York, Buffalo
JAMA. 2014;311(18):1919-1920. doi:10.1001/jama.2014.2228

To the Editor The report by Dr Engebretson and colleagues1 explored the effect of nonsurgical periodontal therapy (scaling and root planing) on glycemic control in persons with type 2 diabetes and chronic periodontitis. Given the high global prevalence of both diseases, the adverse effect of periodontal infection on blood glucose levels and diabetes complications,2 and the improvements in levels of HbA1c following clinically effective periodontal therapy reported in meta-analyses,3 the results of this multicenter RCT require careful review to ensure that the conclusions drawn are supported by the data. We identified important problems with the study design, execution, data interpretation, and reporting that we think render the conclusions inappropriate.

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