•Purpose: present findings of a clinical study using internally placed amalgam or gutta-percha to repair iatrogenic perforations.
•N= 57 molar teeth involving mechanical root perforations
•Records and radiographs of 57 molar teeth involving mechanical root perforations were obtained from the undergraduate student clinic •Perforations were epaired with amalgam or gutta-percha (vertically condensed warm GP.). Evaluation periods from 3 months to 6 yr. •Perforations: furcation perforations in middle \coronal third of root, of chamber floor, & perforation in apical third.
•repaired on the same day discovered or delays of 1 to 60 days.
•Five mand.molars with repaired perforations were found to be failing at initial recall & received surgical repair.
•Perforation repairs considered successful when teeth met criteria by Stromberg. (absence of any sign or symptom)
Most highlighted Results:
1.Overall success : 54.4% (73.1%) had been repaired with GP & (27%) with amalgam.
2.Teeth were repaired with gutta-percha: (42.4%) succeeded
3.Teeth were repaired with amalgam: (74.1%) successful
4.Regardless of the recall period involved, teeth with GP repairs failed more often than teeth with amalgam repairs.
5.All of these surgically treated teeth were judged to be healing successfully at recall evaluations.
6.Delay of repair had no significant effect on the prognosis of the cases considered.
7.69% of all failures occurred when repair materials were extruded beyond the root surface.
Amalgam was found to be superior to gutta-percha when used in perforation repair.