To the Editor The study by Engebretson and colleagues1 adds knowledge about the effect of periodontal treatment on glycemic control in patients with type 2 diabetes and moderate to advanced chronic periodontitis. The authors of this multicenter randomized study (the Diabetes and Periodontal Therapy Trial [DPTT]) concluded that nonsurgical periodontal therapy did not improve HbA1c values. Despite its high internal validity, this trial raises some important interpretation issues, particularly regarding the interventions that were compared.
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