From:  Centre versus peripheral tapping during lateral window sinus lift preparation: an ex vivo comparative study

 Schneiderian membrane perforation according to tapping technique.

Tapping techniquePerforation absent, n (%)Perforation present, n (%)Total, n
Centre tapping12 (60.0)8 (40.0)20
Peripheral tapping16 (80.0)4 (20.0)20
Total28 (70.0)12 (30.0)40

Note: Centre and peripheral tapping were performed on contralateral sides of the same 20 specimens.