Retrospective fractal analyses of one-year follow-up data obtained after single-visit nonsurgical endodontic retreatment on periapical radiographs

Abstract

ObjectivesThe aim of retrospective study was to evaluate the changes to the periapical bone sites after non-surgical endodontic retreatment by using fractal analysis on periapical radiographs. Materials and methods Thirty patients whose teeth had periapical lesions and underwent primary endodontic treatment were selected for nonsurgical single-visit endodontic retreatment. Two radiographs were taken, the first immediately after retreatment and the second at the 1-year follow-up. An identical region of interest close to the infected root apex was selected from each radiograph. FD was measured using the box-counting method. Periapical status was evaluated using the periapical index (PAI). Treatment outcomes were categorized into healed (PAI < 3), or not healed (PAI ≥ 3) based on radiographic criteria. ResultsThe mean FD value significantly increased at the 1-year follow-up compared to baseline. No significant sex biases were apparent. According to the PAI, retreatment after 1 year resulted in a 63.3% healed. ConclusionThe extent of periapical trabecular bone evident radiographically increased, as revealed by FD data, 1 year after endodontic retreatment. Clinical relevanceThe use of fractal analysis as a quantitative method to evaluate changes in periapical trabecular bone (such as healing and inflammation) after endodontic retreatment can be an important marker in determining the prognosis of endodontic retreatment.

Anatomical assessment of the trabecular structure of the alveolar bone in periodontal disease by fractal analysis method

“…It has been reported that the FD value calculated by the studies is not affected by variables such as irradiation time (mAs), kilovolt peak acceleration voltage (kVp), and projection angle, therefore fractal analysis can be performed with non-standardized radiographs during the filming of (33)(34)(35).…”

The Quantitative Method for Following Radiologic Healing in Endodontic Retreatment; 1-Year Follow-up Study

“…According to the PAI system, which is the commonly used index in the literature in the analysis of radiographic findings, PAI 1 and 2 scores are reported as healing in most of the studies. 8,[15][16][17] In this study, the same scores were taken as a reference. A healing pattern (PAI 1 and PAI 2 scores) was observed at the end of 1 year in all 29 teeth included in this study.…”

“…3.1.9.2, Franz Faul; Universitat Kiel, Germany), a total sample size of 29 is required when α = 0.05, and the effect size is 0.45, which would yield a power of 0.80. 15 Periapical radiographs (T0) and 1-year follow-up radiographs (T1) taken immediately after retreatment of 29 individuals who were admitted to the endodontic clinic between 2020 and 2021 with indications for retreatment were used.…”

“…Similar to earlier research, PAI scores were categorized as "healed" (PAI < 3) or "not healed" (PAI ≥ 3) at the baseline or 1-year follow-up. 15,17,18 Fractal Analysis Images were obtained using a Dell Precision T5400 workstation with a 19-inch 1920 x 1080 resolution screen (Dell, Round Rock, TX, USA) (Dell E190S, China). A blinded dentomaxillofacial radiologist (S.Y.)…”

Effects of different obturation techniques on postoperative pain and radiographic healing non surgical endodontic retreatment in single visit in teeth with single root canals and apical periodontitis: Randomized controlled clinical trial

“…Teeth with previously endodontic treatment but unsuccessful and developing AP, root canal obturation 2 mm shorter than the working length and teeth that do not show adequate obturation, Patient with systemic disorders related to bone metabolism and using drugs that may affect bone metabolism, Patient with acute pain and therefore using analgesic medication in the last 24 hours, Patient with using antibiotics 2 weeks before the treatment, Patients who could not attend control sessions were excluded from the study [13].…”