Reino 2015.

Methods	RCT, split‐mouth design, 2 treatment groups, 6 months' duration
Participants	20 individuals, 14 females, aged 26 to 46 years, with 2 bilateral Miller Class I or II buccal gingival recessions of at least 3 mm
Interventions	1. XCM + CAF (extended flap) 2. XCM + CAF
Outcomes	GRC*(1) CALC KTC MRC (Automated controlled force probe and calliper)
Notes	University/hospital‐based and supported by the State of São Paulo Research Foundation, São Paulo, Brazil and Geistlich Pharma AG
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Computer‐generated randomly permuted block
Allocation concealment (selection bias)	Low risk	Sealed envelopes
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Information not reported
Blinding of outcome assessment (detection bias) All outcomes	Low risk	All measurements were performed by 1 examiner not 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)	Low risk	Evidence of selective reporting of outcomes was not detected
Other bias	Low risk	Evidence of other bias was not detected