The purpose of this retrospective study was to evaluate the quality of treatment and incidence of flare-ups when teeth with resorcinol-formaldehyde resin are retreated in a postgraduate endodontic clinic. Fifty-eight cases were included in this study. Obturated and unfilled canal space was measured on radiographs. Forty-eight percent of the total canal space was filled before retreatment; 90% w...

objectives: this study aimed to assess and compare the apical sealing ability of herofill® soft-core system and lateral condensation technique in fine curved canals using the fluid filtration method. materials and methods: forty human mesiobuccal root canals of mandibular first molars with 25° to 40° curvatures were instrumented to an apical size 30/0.04. roots were randomly assigned to two exp...

AIM To investigate the incidence of fracture and deformation observed on Reciproc instruments after clinical use. METHODOLOGY A total of 1696 Reciproc NiTi instruments that were discarded after normal clinical usage over 30 months were collected. Of these 1580 instruments were R25 (93%), 76 were R40 (5%), and 40 were R50 (2%). The treatments included 3780 root canal preparations, 3023 primary...

Objective: The aim of this study was to compare the amounts debris extruded apically with use different single file systems during endodontic retreatment. Material and Methods: 36 mandibular premolar teeth were prepared ProTaper Universal files up F3. At every instrument change, root canals irrigated 2 mL 5.25% NaOCl solution. After canal preparation, final irrigation performed using 5 17% EDTA...

The purpose of this in vitro study was to evaluate the capacity of ProFile.04 Taper Series 29 files to remove gutta-percha during curved root canal retreatment. Forty-four mandibular molars whose mesial roots presented between 26 and 40 degrees of curvature, determined by Schneider's method, were selected. The root canals were enlarged to ISO size 35 and obturated with laterally condensed gutta...

The purpose of this study was to compare the incidence and longitudinal propagation of dentin defects after gutta-percha removal with hand and rotary instruments using microcomputed tomography. Twenty mandibular incisors were prepared using the balanced-force technique and scanned in a 19.9 μm resolution. Following filling with the lateral compaction technique, gutta-percha was removed with Pro...

Aim: To compare the efficacy of various instrumentation techniques for removing obturating material from root canals using Cone Bean Computed Tomography (CBCT). Materials and Methods: Thirty extracted human premolar teeth, each with a single canal were selected. The root canals were prepared upto F4 ProTaper file and obturated with corresponding gutta percha cone. Teeth were divided into three ...

apical extrusion of debris and irrigants during cleaning and shaping of the root canal is one of the main causes of periapical inflammation and postoperative flare-ups. the purpose of this study was to quantitatively measure the amount of debris and irrigants extruded apically in single rooted canals using two reciprocating and one rotary single file nickel-titanium instrumentation systems.sixt...

introduction: disinfection and subsequent obturation of the root canal space require adequate mechanical enlargement of the canals. the purpose of this in vitro study was to compare the shaping ability of mtwo, race and medin rotary instruments during the preparation of curved root canals. materials and methods: sixty mesiobuccal root canals of mandibular molars with severe curvatures between 2...

introduction: retreatment of endodontically treated teeth is a challenge that requires complete removal of the previous filling material. several techniques are indicated for this procedure. the present review tries to identify the most efficient method for extirpation of resilon (rs) root fillings and to compare the speed and efficacy of rs and gutta-percha (gp) root filling removal. methods a...