Table 2 Risk-of-bias assessment of the included studies
Authors/year | Randomization | Blinding | Incomplete outcome data | Selective outcome reporting | Similarity of groups at baseline | Control of confounding and interaction | Conflict of interest |
|---|---|---|---|---|---|---|---|
Strub JR et al., 1979 | No | No | No | No | Yes, split-mouth design | No | None |
Snyder AJ et al., 1984 | No | No | No | No | N/A | No | None |
Zefiropoulos GG et al., 2007 | No | Yes, single blinding | Yes, CAL gain | No | No | No | None |
Rajesh JB et al., 2009 | Yes, random-number table method | No | No | No | No | No | Yes, study was supported by the graft material company* |
Sukumar S et al., 2010 | No | No | No | No | N/A | No | None |