Relationship between diabetes and periodontal infection

Table 1 How periodontal therapy affects diabetes glycemic control

	Ref.	Design	Sample	Follow-up	Outcome	Results
Type 1	Aldridge et al[55]	Randomized clinical trial	23 subjects	2 mo	HbA1c	No changes
	Smith et al[47]	Controlled clinical trial	18 subjects	2 mo	HbA1c	No changes
	Christgau et al[53]	Cohort study	7 subjects	4 mo	HbA1c	No changes
	Llambés et al[45]	Randomized clinical trial	30 subjects	3 mo	HbA1c	0.06% reduction (no changes)
Type 2	Stewart et al[75]	Controlled clinical trial	72 subjects	10 mo	HbA1c	6% reduction
	Kiran et al[51]	Randomized clinical trial	44 subjects	3 mo	HbA1c	0.8% reduction
	Faria-Almeida et al[46]	Cohort study	20 subjects	6 mo	HbA1c	5.7% reduction
	Dağ et al[56]	Controlled clinical trial	45 subjects	3 mo	HbA1c	No changes
	Auyeung et al[57]	Cohort study	75 subjects	12 mo	HbA1c	No changes
	Engebretson et al[58]	Randomized clinical trial	257 subjects	6 mo	HbA1c	No changes
	Gay et al[59]	Randomized clinical trial	126 subjects	4 mo	HbA1c	No changes