objective: the diagnosis of vertical root fracture (vrf) in endodontically treated teeth is a clinical challenge due to lack of specific clinical and radiographic signs. although radiographic evaluation such as cbct is helpful, intracanal posts can produce artifacts and may impair the quality of cbct scans. this study aimed to compare the diagnostic accuracy of different resolutions of cbct in ...

Current improvements in nickel-titanium (Ni-Ti) rotary file systems have created a paradigm shift the root canal therapy of primary teeth. Therefore, it is necessary to perform comprehensive evaluation regarding efficiencies newly manufactured instruments for different parameters. The current study was conducted evaluate abilities RaceEvo, R-Motion, ProTaper Gold (PTG) curved canals with regard...

AIM The aim of this study was to measure the increase in root canal surface area and canal transportation after biomechanical preparation at 1, 3, and 5 mm short of the apex with three different rotary systems in both continuous rotary and reciprocating rotary motions. MATERIALS AND METHODS Sixty freshly extracted human mandibular molars with mesial root canal curvatures between 20° and 30° w...

introduction: this study aimed to perform a rigorous sample standardization and also evaluate the preparation of mesiobuccal (mb) root canals of maxillary molars with severe curvatures using two single-file engine-driven systems (waveone with reciprocating motion and oneshape with rotary movement), using micro-computed tomography (micro-ct). methods and materials: ten mb roots with single canal...

The aim of this study was to evaluate the influence of the flexion angle of files on the decentralization of root canals during instrumentation. Fifteen lower incisors were instrumented with Protaper Universal files and radiographed in two directions (mesiodistal and buccolingual) before and after instrumentation with a #15 K-file in position for evaluating the flexion angle of files. The speci...

objectives: accurate localization of the inferior alveolar canal (iac) is extremely important in some dental treatments. anatomical variation of the canal means that it can be difficult to locate. the purpose of this study was to assess the relationship of the gonial angle (ga) size and iac position using cone beam computed tomography (cbct). materials and methods: in this in vitro study, 61 dr...

abnormal elongation of the mandibular coronoid process is rare and its etiology is not yet elucidated. the aim of this report is to demonstrate and discuss the relationship between elongated mandibular coronoid process and limitation of mouth opening with cone beam computed tomography. although the clinical characteristic of elongation of the coronoid process is mandibular limitation, in this r...

introdouction: mastoid pneumatization is often complete by the age of 5-years and may involve the temporo mandibular joint (tmj) region, including the pneumatized articular tubercle (pat) and pneumatized roof of the glenoid fossa (prgf). to prevent surgical complications, the diagnosis of these air cells is important. the aim of this study was to determine the prevalence and characteristics of ...

conclusions most extracted maxillary first molars were three rooted and four canals. cbct has relatively high reproducibility and accuracy of distinguishing mb2 canal. results we found 100% of cases with three separated roots, from which 69.23% had four canals including mb2 and 30.77% with three canals. 71.3% of mesiobuccal roots were two canals of type two vertucci and 28.7% type 4 with the me...