Treatment of periodontal dehiscence-type defects with collagen and ePTFE membranes. Histometric analysis in dog - Marcantonio, Rosemary Adriana Chierici [UNESP]; Marcantonio, E.; Cirelli, Joni Augusto [UNESP]; Goissis, G. (American Association for Dental Research (AADR), 1997)