Purpose: to investigate histologically healing of the periodontal tissue after surgical treatment of root perforation
N= 16 perforations on lower premolars and molars of 2 dogs
•The root canals were filled with Chloroform rosin and gutta percha cones •16 perforations were then made by bur in the canal
•The sample was divided into 2 groups
(A: 8 immediate repair,
B: 8 delayed repair) and subdivided into subgroups of repair material (A1,B1: Gutta percha & A2,B2: amalgam)
•The perforations were repaired surgically, a flap was raised bone over perforation removed
-GP groups, GP was trimmed to the perforation exit by warm instrument
-amalgam groups, amalgam was added to the perforation exit.
•The durations of observation periods ranged from 120 and 524 days.
•In group B (delayed repair), the perforation entrances were sealed with phosphate cement and perforation repair was made at 43,275, 266 and 292 days after perforation
Most highlighted Results:
•In immediate repair group, a favorable healing of periodontal tissue occurred.
-Epithelial proliferation was noted in one case in which the perforation was closed to the gingival crevice.
•In delayed repair group, a less favorable healing occurred
-Bone destruction and lowering of interdental bone crest occurred in the period before the repair which resulted in proliferation of cervical epithelium to the perforation site
•Gutta percha caused less irritation and inflammation of the tissues than amalgam
Clinical significance: immediate repair of perforation produce more favorable healing