Background and Aim: Complete removal of gutta-percha from the root canal system and its remnants is a challenge in endodontic retreatment. This ex-vivo study aimed to assess the efficacy of XP-Endo Finisher R (XEFR) in removing root filling remnants from straight canals of mandibular premolars in root canal retreatment.   Materials and Methods: In this ex-vivo study, 30 single-rooted mandib...

T bstract his study evaluated the time, occurrence of fracture, nd quality of apical cavity preparation with three ifferent ultrasonic diamond tips: Satelec, Trinity, and a ew type, CVD (chemical vapor deposition), using scaning electron microscopy (SEM) analysis. Thirty human ingle-rooted premolars were selected, submitted to picectomy, and prepared with ultrasonic tips; impresions were then o...

Abstract Vertical root fractures are more commonly encountered following endodontic treatment and in teeth without treatment, with habits like bruxism eating coarse, hard food. The most predisposed to fracture the premolars of maxilla mandible, mesial roots mesiobuccal mandibular molars, maxillary molars incisors. Timely identification cracked is key since it permits a conservative preventive a...

Rooted quivers are quivers that do not contain A∞ ≡ ··· → • → • as a subquiver. The existence of flat covers and cotorsion envelopes for representations of these quivers have been studied by Enochs et al. The main goal of this paper is to prove that flat covers and cotorsion envelopes exist for representations of A∞. We first characterize finitely generated projective representations of A∞. We ...

7 An antimatroid is a family of sets such that it contains an empty set, and it is accessible and closed under union of sets. An antimatroid is an ‘antipodal’ concept of matroid. 9 We shall show that an antimatroid is derived from shelling of a poset if and only if it does not contain a minor isomorphic to S7 where S7 is the smallest semimodular lattice that is not 11 modular. It is also shown ...

PURPOSE To evaluate in vitro the fracture resistance of quartz fiber posts for three different dowel lengths. METHODS 30 single-rooted human premolars with similar root length and diameter were endodontically treated and randomly divided into three experimental groups (n = 10) according to the post space depth created: (1) 5 mm; (2) 7 mm; (3) 9 mm. Quartz fiber posts (Endo Light post) were ce...

Objective. To compare the efficacy of ProTaper retreatment files in removing three different obturating materials. Study Design. Forty-five human, single-rooted premolars were divided into three experimental groups. Group 1 was obturated with gutta-percha and AH Plus sealer, Group 2 was obturated with gutta-percha and zinc oxide eugenol sealer, and Group 3 was obturated with GuttaFlow. Retreatm...

Materials and Methods: 15 single rooted premolars were selected and middle portion of each root was sectioned perpendicular to the long axis to produce two discs of 2.00 ± 0.05 mm thickness using a diamond disk. 30 root slices were produced and canal lumen was widened using Gates Glidden drills to produce standardized internal diameter of 1.3mm and root sections were filled with ERRM, MTA and B...

Aims: To compare the apical sealing ability of TotalFill BC, AH Plus Jet, and GuttaFlow Bioseal sealers. Materials Methods: Thirty single rooted mandibular premolars were decoronated standardized at 15mm. The specimens chemo- mechanically prepared, randomized into three experimental groups (n =10) according to root canal sealer tested: Jet and, Bioseal. filled using cone technique. decalcified,...

Running title: Root and canal morphology of maxillary first premolar teeth Abstract Aim : To determine the variations in the root and canal morphology of the maxillary first premolar teeth in a Ugandan population. Methodology : Extracted maxillary first premolar teeth (n = 202) were evaluated in this study. The specimens had their pulp chambers de-roofed. They were decalcified in nitric acid an...