Clinical ResearchThe Influence of Different Factors on the Survival of Root Canal Fillings: A 10-Year Retrospective Study
Section snippets
Materials and Methods
All root canal fillings performed in 1990 and 1991 at the Department of Operative Dentistry, Dental School, Philipps University of Marburg, Germany, were followed up with reference to the dental records. The patient's name and date of birth were taken from the radiographic records of the respective year with reference to the control radiograph made on completion of any endodontic treatment.
The unit ‘tooth' was specified as the smallest study unit. In cases where more than one tooth had
Results
Followed up were 965 teeth that had undergone endodontic treatment in 1990 and 1991 at the Department of Operative Dentistry, Philipps University of Marburg, Germany. Of these, 441 root canal fillings (45.7%) dated from 1990, and 524 (54.3%) from 1991. There were 51 root canal fillings (5.3%) that had been placed presurgically for planned root resections not included in the study, so that 914 root canal fillings were available for further evaluation.
The gender distribution was well balanced
Discussion
There were 914 teeth that had undergone root canal treatment and were followed up in the present study. The number of teeth investigated in comparable studies ranges between 22 and 2298 (7), one study had access to 110,766 cases using a data-warehousing approach at an insurance company database (15). By contrast, some authors specified the number of roots; this ranged between 501 (8) and 1277 (16).
In the present study, the tooth was selected as the smallest study unit. A subdivision based on
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