The prevalence of AP in root-filled and untreated teeth was comparable to that reported in previous methodologically compatible studies. The quality of both the root filling and the restoration were found to impact on the periapical health of root-filled teeth, with the impact of the restoration being most critical when the quality of the root filling was adequate.

The purpose of this study was to assess quality of life and satisfaction in relation to endodontic treatment in two Canadian populations and the association of these outcomes with the treatment providers' level of training (generalist or endodontist). New patients aged 25 to 40, presenting at the dental faculties in Toronto and Saskatoon were screened. Patients with radiographically identifiable endodontic treatment were invited for interviews conducted using a questionnaire that measured changes in quality of life after endodontic treatment and semantic differential scales that measured satisfaction with endodontic treatment. Data were analyzed using Chi-square, multiple and logistic regression (p < 0.05), and Mann-Whitney U test (p < 0.02). Subjects reported preoperative factors (e.g., pain, sleep disturbances) impacting quality of life, which improved after endodontic treatment, significantly more in the Toronto than in the Saskatoon population. Satisfaction was significantly better when endodontic treatment was provided by endodontists.

Summary. This study compared syringe irrigation with endosonic‐facilitated irrigation. Two experiments, conducted on acrylic models and extracted natural human teeth, tested both the degree of apical penetration and the flushing potential of irrigant in canals prepared to different sizes. Radio‐opaque dyes of different viscosities were used to monitor radiographically irrigant delivery or dye removal. Results indicated that endosanics was significantly superior to syringe irrigation alone, particularly in canals prepared apically to a diameter of 0.3 mm or less without coronal flaring.