نتایج جستجو برای: dentinal cracks

تعداد نتایج: 13974  

Journal: :Journal of the mechanical behavior of biomedical materials 2010
Matthew D Landrigan John C Flatley Travis L Turnbull Jamie J Kruzic Jack L Ferracane Thomas J Hilton Ryan K Roeder

A new technique using contrast enhanced micro-computed tomography (micro-CT) was developed to improve the ability to detect dentinal cracks in teeth and assess associated risks to oral health. Extracted, whole human molars that exhibited visual evidence of external cracks following extraction and machined, partially fractured elephant dentin specimens were labeled by BaSO(4) precipitation and i...

Journal: :Journal of endodontics 2013
Sebastian Bürklein Polymnia Tsotsis Edgar Schäfer

INTRODUCTION The purpose of this study was to evaluate the incidence of dentinal defects after root canal preparation with reciprocating instruments (Reciproc and WaveOne) and rotary instruments. METHODS One hundred human central mandibular incisors were randomly assigned to 5 groups (n = 20 teeth per group). The root canals were instrumented by using the reciprocating single-file systems Rec...

Abbas Mohammadi EshaghAli Saberi Sediqe Ebrahimipour Sepideh Baniasadi

Background and Aim:Root canal preparation with rotary instruments may cause dentinal cracks leading to tooth fracture. The aim of this study was to compare three different rotary systems ProTaper, RaCe and Niti Tee on formation of dentinal cracks following root canal preparation. Materials and Methods: In this experimental study, 50 extracted mandibular first molars were selected. Teeth having ...

2016
Fauzia Ashraf Pushpa Shankarappa Abhinav Misra Asheesh Sawhney Nandamuri Sridevi Anu Singh

Introduction. The aim of the present study was to evaluate the dentinal cracks after root canal preparation with rotary files: Gates Glidden, ProTaper Universal, ProTaper Next, and HyFlex CM at different instrumentation lengths. Methodology. Sixty-five mandibular premolars were mounted in the acrylic tube with simulated periodontal ligaments and the apex was exposed. The root canals were instru...

Journal: :middle east journal of rehabilitation and health studies 0
kiumars nazari moghaddam department of endodontics, dental school, shahed university, tehran, ir iran seyed lotfoallah derakhshan endodontics private practice, tehran, ir iran mohammad adeli department of endodontics, dental school, shahed university, tehran, ir iran; department of endodontics, dental school, shahed university, tehran, ir iran ehsan hamzelouei moghadam department of endodontics, dental school, shahed university, tehran, ir iran mohadeseh hashemzehi department of endodontics, dental school, shahed university, tehran, ir iran mohammad sadegh nazari tehran dental branch, islamic azad university, tehran, ir iran

conclusions regarding the study limitations, dentinal cracks were observed in all files and distances from the apex. although there was more crack incidence in protaper files, no significant differences were noted regarding the studied systems and sections from the apex. materials and methods in an experimental in vitro trial, 80 maxillary and mandibular first molars were selected and their cro...

Journal: :Journal of endodontics 2004
Henry M Wright Robert J Loushine R Norman Weller W Frank Kimbrough Jennifer Waller David H Pashley

The dilemma of diagnosing and possibly treating dentinal cracks continues to present a challenge in endodontics. The purpose of this in vitro study was to compare the effectiveness of transillumination and dyes in identifying root-end dentinal cracks. Fifty maxillary central incisors were decoronated, and the canals were instrumented to an ISO size 50 at the working length. The apical 3 mm of t...

2017
Azadeh Harandi Sina Mirzaeerad Mahgol Mehrabani Elham Mahmoudi Ali Bijani

Introduction This study aimed to compare the incidence of dentinal crack formation by instrumentation with ProTaper Universal system (rotary, multi-file system), SafeSider (reciprocation movement, multi-file system) and Neolix (rotary, single-file system). Methods and Materials In this in vitro study, 60 freshly extracted mandibular first molars were randomly divided into three experimental g...

Journal: :iranian endodontic journal 0
sahar jalali behrooz eftekhar payam paymanpour mohammad yazdizadeh mansour jafarzadeh

introduction: the aim of this study was to compare the formation of dentinal crack and craze lines in the root dentin during root canal preparation with three different niti endodontic systems, naming reciproc (rcp), protaper universal (ptu) and mtwo. methods and materials: one hundred extracted mandibular premolars with single canals were selected and decoronated. the teeth were randomly divid...

Journal: :Brazilian dental journal 2016
Gustavo De-Deus Felipe Gonçalves Belladonna Juliana Roter Marins Emmanuel João Nogueira Leal Silva Aline de Almeida Neves Erick Miranda Souza Alessandra de Castro Machado Ricardo Tadeu Lopes Marco Aurélio Versiani

This study aimed to evaluate the cause-effect relationship between canal preparation with ProTaper Universal (PTU) system and dentinal defects formation using micro-computed tomography (micro-CT) analysis. Forty mesial canals of mandibular molars with a type II Vertucci's canal configuration were scanned at an isotropic resolution of 14.16 µm. The sample was assigned to an experimental (n = 30)...

2015
Sahar Jalali Behrooz Eftekhar Payam Paymanpour Mohammad Yazdizadeh Mansour Jafarzadeh

INTRODUCTION The aim of this study was to compare the formation of dentinal crack and craze lines in the root dentin during root canal preparation with three different NiTi endodontic systems, naming Reciproc (RCP), ProTaper Universal (PTU) and Mtwo. METHODS AND MATERIALS One hundred extracted mandibular premolars with single canals were selected and decoronated. The teeth were randomly divid...

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