introdouction: variations in root canal morphology pose a challenge for successful endodontic treatment. the root canal anatomy of the maxillary first molar has been often described as three roots with four canals (two mesiobuccal, one distobuccal, and one palatal). the occurrence of two palatal canals in one palatal root is quite rare. this report represents the case of a maxillary first molar...

objectives: pain is an unpleasant outcome of endodontic treatment that can be unbearable to patients. instrumentation techniques may affect the frequency and intensity of post-endodontic pain. this study aimed to compare single visit post endodontic pain using mtwo (niti) rotary and hand k-file instruments. materials and methods: in this randomized controlled trial, 60 teeth with symptomatic ir...

introduction: the purpose of the present study was to quantify and compare the amount of extruded debris from apical foramen after instrumentation of the root canal system with hand and rotary instruments. materials and methods: root canals of forty five fresh extracted single rooted human teeth with mature apexes and less than 15 degree of root curvature were instrumented in group a with stain...

introduction : there is a direct relationship between the quality of root canal obturation and success of endodontic therapy. the aim of the present study was to assess the quality of canal obturation performed by undergraduate dental students at the faculty of dentistry, mashhad university of medical sciences, mashhad, iran. materials and methods: records of 200 endodontically treated teeth fr...

conclusions it is required to consider the strategies during student education in dental schools for both under and post-graduation dental students and better to follow them in workshops for other dentists and even endodontists. results the most stressful stage of root canal therapy was endodontic treatment for children in male endodontists and residents, preparing access cavity on crowns in fe...

introduction: the fracture strength of endodontically treated teeth compared to vital ones has long been a source of controversy. it is not clear how root canal therapy affects the stress distribution in teeth. the purpose of this study was to evaluate the changes in stress distribution after root canal therapy in a human maxillary canine by finite element analysis (fem). materials and methods:...

introduction: general dental practitioners provide the majority of treatment in iran. the aim of this study was to gather information on the methods, materials and attitudes employed in root canal treatment by dentists participated in 7 th congress of iranian academy of restorative dentistry in shiraz /2007 in order to evaluate the quality of current practice. materials and methods: a questionn...

The main objective of endodontic therapy is the thorough mechanical and chemical cleansing of the entire root canal system and its complete obturation with an inert filling material. Failure to find and fill a canal contributes toward the failure of endodontic therapy .The root canal anatomy of mandibular first molars is complex. Studies of the morphologic structure of root canal systems hav...

introduction : dentin removal during root canal instrumentation creates a weaker root structure and increases its potential to fracture. the aim of this in vitro experimental study was to compare fracture resistance of teeth filled with gutta-percha, and resilon using two different techniques. materials and methods: this study was performed on 105 single-canal extracted maxillary incisors. samp...