Reino 2012.

Methods	RCT, split‐mouth design, 2 treatment groups, 6 months' duration
Participants	12 individuals (heavy smokers ‐ 20 or more cigarettes per day for more than 5 years), 10 females, aged 35 to 50 years, with 2 bilateral Miller Class I or II buccal gingival recessions of at least 3 mm
Interventions	1. SCTG + CAF (extended flap) 2. SCTG + CAF
Outcomes	SCRC PCRC MRC (Automated controlled force probe and manual probe)
Notes	University/hospital‐based and supported by the State of São Paulo Research Foundation, São Paulo, Brazil
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Coin toss
Allocation concealment (selection bias)	Unclear risk	Method not reported
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Information not reported
Blinding of outcome assessment (detection bias) All outcomes	High risk	All measurements were performed by 1 examiner aware of the type of surgical procedure
Incomplete outcome data (attrition bias) All outcomes	Low risk	All patients completed the follow‐up period
Selective reporting (reporting bias)	Unclear risk	Baseline and follow‐up means regarding recession depth, clinical attachment level and keratinized tissue width were not reported in the study
Other bias	Low risk	Evidence of other bias was not detected