Chicago : Quintessence Publishing Company , 1999 . When the perforation is small and located in an area where the elevated mucosa is folded together , it will be healed by itself . If the perforation is large and located in an unfavorable area , the perforation needs to be closed in to prevent loss of the bone graft (see Vlassis JM , Fugazzotto PA . Aclassification system for sinus membrane perforations during augmentation procedures with options for repair . J Periodontol 1999 70 : 6929 . Perforation of the membrane...











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