If during rubber dam application, you see the gingiva is protruding out of margins; what can be the cause for it?
Holes punched too close together - holes pull away from teeth causing leakage.
Holes punched too far apart- dam bunches up between teeth.
Holes position too low on the dam - dam covers patient's eyes or nose.
Holes position too high on dam - dam does not extend over upper lip.
Holes on rubber dam placed too far from each other
Holes on rubber dam placed too close from each other
Gingival tissue around holes are oedematous
Rubber dam is too thin