Zucchelli 2009.

Methods	RCT, split‐mouth design, 2 treatment groups, 6 months' duration
Participants	11 individuals, aged 18 to 40 years, with 2 Miller Class I maxillary buccal gingival recessions of at least 3 mm
Interventions	1. Ultrasonic instrumentation ‐ CAF 2. Hand instrumentation ‐ CAF
Outcomes	GRC CALC KTC SCRC PCRC MRC (Manual pressure sensitive probe)
Notes	University/hospital‐based
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	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