نتایج جستجو برای: human extracted molars

تعداد نتایج: 1766142  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - دانشکده حقوق 1389

abstract the third millennium has started, but the world is facing with serious challenges in achieving international security and peace. various human rights violations have lead the states to find means to protect human rights. also article 55 of the united nations charter introduces the respect to human rights and fundamental freedom as the most suitable ways to realize peace and security. ...

2008
Zohreh Khalilak Arjang Fallahdoost Bahareh Dadresanfar Gholamreza Rezvani

INTRODUCTION We aimed to compare apical canal transportation of extracted teeth and two types of simulated resin blocks. MATERIALS AND METHODS Mesiobuccal root of extracted maxillary molars, high hardness simulated resin blocks (Knoop hardness=40) and low hardness simulated resin blocks (Knoop hardness=22) were prepared with K-files using step-back technique (n=15 canals in each group). Doubl...

Journal: :Journal of oral science 1998
S Kandemir

The purpose of this study was to investigate the determinability of the distance between the pulp horns (PHD) radiographically under routine clinical conditions. This study was carried out on 36 maxillary and 28 mandibular first and second molars which were extracted because of periodontal diseases. Prior to extraction two radiographs were taken from each tooth, one using the bisecting-angle te...

2012
Xingfu Bao Min Hu Yi Zhang Ferdinand Machibya Ying Zhang Huan Jiang Dongsheng Yu

OBJECTIVE To evaluate the short-term effect of fangchinoline, an antiinflammatory drug widely used in Asia, on root resorption that is associated with orthodontic tooth movement. METHODS Twenty-four Wistar rats were randomly divided into 6 groups. Mesial forces of 0, 50, or 100 g were applied to the maxillary first molar of the rats in each group for 14 days by activating nickel-titanium clos...

2001

During the mixed-dentition stage of dental development, dentists may encounter patients with first permanent molars considered to have a poor long-term prognosis. In this situation, extraction of the tooth and space closure or use of the extraction space for future orthodontic treatment should be considered. The aim of this article is to give guidelines about treatment planning for patients who...

Journal: :journal of dentistry, tehran university of medical sciences 0
m. mirzaei assistant professor, department of operative dentistry, school of dentistry, tehran university of me m. ghavam associate professor, dental research center, tehran university of medical sciences, tehran, iran t. rostamzadeh dentist, private practice

objective: preservation of unsupported occlusal enamel after removal of underlying carious dentin may result in maintenance of aesthetics as well as wear resistance against the opposing enamel. this study investigates the influence of different restorative materials and bonding agents on reinforcement of unsupported enamel in molars and compares it with sound dentin. materials and methods: in t...

Journal: :dental research journal 0
f. ezoddini ardakani z. mohammadi

introduction proper cleaning and shaping of the root canal system is one of the most important aspects of endodontic therapy. to estimate the canal length before instrumentation in endodontic treatment, traditionally, conventional radiographic techniques and, recently, direct digital radiography (ddr) are applied. the application of computer technology in radiography has allowed less exposure t...

Journal: :iranian endodontic journal 0
zohreh khalilak department of endodontics, dental school, islamic azad university/ iranian center for endodontic research, tehran, iran arjang fallahdoost department of endodontics, dental school, islamic azad university/ iranian center for endodontic research, tehran, iran bahareh dadresanfar department of endodontics, dental school, islamic azad university/ iranian center for endodontic research, tehran, iran gholamreza rezvani general practitioner, tehran, iran

introduction: we aimed to compare apical canal transportation of extracted teeth and two types of simulated resin blocks. materials and methods: mesiobuccal root of extracted maxillary molars, high hardness simulated resin blocks (knoop hardness=40) and low hardness simulated resin blocks (knoop hardness=22) were prepared with k-files using step-back technique (n=15 canals in each group). doubl...

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