Archives

VOLUME 2 NO. 2 , 2018

ONLINE FIRST

Factors affecting ultrasonic removal of separated endodontic instruments: A retrospective clinical study

Factors affecting ultrasonic removal of separated endodontic instruments: A retrospective clinical study

Balint Tordai / Karoly Schreindorfer / Edina Lempel / Károly Krajczar

Objective: The goal was to investigate the clinical value of two-dimensional radiographs and different radiographic measurement techniques before instrument removal with a microsonic technique. The aim was to find an easy-to-use technique for predicting the success of removal and case evaluation. Additionally the quality of root canal filling after instrument removal was assessed. Method and Materials: This retrospective study analyzed patients’ records and preoperative and postoperative periapical radiographs made using the paralleling technique. On preoperative radiographs, canal access angle and Schneider and Weine angle of root canal curvature were measured and compared. The Schafer method was used for measuring the radius of curvature. In cases of successful removal taper, homogeneity and length of obturation were evaluated on postoperative radiographs. Results: A total of 123 cases of instrument removal were investigated. In total, 97 fragments (78.9%) were removed successfully. Statistical analysis was performed with Pearson’s chi-square and Fisher’s exact test (a < .05). The site of fragment relative to canal curvature, canal access angle, and Schneider angle significantly influenced the success of removal. The highest chance of removal failure was associated with > 20 degrees of canal access angle and > 40 degrees of Schneider angle. Only 26.3% of obturations met all technical standards. Altered taper could be identified in 64.2% and was always associated with ledge formation. Conclusion: Microsonic removal is a successful method to retrieve separated instruments. The use of only one radiographic measurement technique is not sufficient to precisely evaluate root canal anatomy, case difficulty, and chance of successful removal before instrument removal on a periapical radiograph. Postoperative root canal fillings are mainly substandard.

Quintessence Int 2018;49:257–266.

OTHER ONLINE ARTICLES

Failed blade implant after 25 years in function: Case description and Histologic analysis

Failed blade implant after 25 years in function: Case description and Histologic analysis

Davide Farronato / Davide Fumagalli / Farah Asa’ad / Pietro M. Pasini / Francesco Mangano / Giulio Rasperini

This report describes a failed blade implant after 25 years in function in the left maxilla and the results of histologic analysis of peri-implant tissues. The blade was retrieved, and histologic findings revealed that it was not osseointegrated despite being successfully in function for so many years. The long-term function of blade implants without osseointegration can be attributed to biotolerance exhibited by the implant rather than actual osseointegration.
Morphometric variation in maxillary central incisors and its influence on gingival characteristics: A preliminary epidemiologic study in an Indian population

Morphometric variation in maxillary central incisors and its influence on gingival characteristics: A preliminary epidemiologic study in an Indian population

Rajashri A. Kolte / Abhay P. Kolte / Pranita A. Rode / Vishal Kher / Tony Shori

Thepresence of interdental papilla between the maxillary central incisors has aconsiderable influence on harmonizing esthetics and biologic functions.Preliminary investigations indicate an association between tooth shapes andperiodontal characteristics. This study aimed to evaluate the prevalence ofmorphologic variation in maxillary central incisors and its influence ongingival characteristics. It was determined that varied crown forms have adefinite influence on gingival characteristics, which could act as a valuableguideline in periodontal, restorative, and anterior implant placementprocedures.