نتایج جستجو برای: dentinal crack

تعداد نتایج: 26036  

Journal: :journal of dentistry, tehran university of medical sciences 0
abdollah ghorbanzadeh assistant professor, department of endodontic dentistry, faculty of dentistry, tehran university of medical sciences, tehran, iran. soran aminifar leila shadan hamed ghanati

to compare three various methods in the diagnosis of dentinal cracks formed in the apical third after root resection.one hundred extracted human maxillary central incisors were selected. the root canals were prepared with step-back technique. then 3mm from the apical end of all roots was cut perpendicular to the long axis of the tooth. the apical end of each root was evaluated to make sure ther...

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 ...

2017
Ramón Miguéns-Vila Benjamín Martín-Biedma Purificación Varela-Patiño Manuel Ruíz-Piñón Pablo Castelo-Baz

Background One of the causative factors of root defects is the increased friction produced by rotary instrumentation. A high canal curvature may increase stress, making the tooth more susceptible to dentinal cracks. The purpose of this study was to evaluate dentinal micro-crack formation with the ProTaper NEXT and ProTaper Universal systems using LED transillumination, and to analyze the micro-...

Journal: :Restorative dentistry & endodontics 2015
Sevinç Aktemur Türker Emel Uzunoğlu

OBJECTIVES The aim was to evaluate dentinal crack formation after root canal preparation with ProTaper Next system (PTN) with and without a glide path. MATERIALS AND METHODS Forty-five mesial roots of mandibular first molars were selected. Fifteen teeth were left unprepared and served as controls. The experimental groups consist of mesiobuccal and mesiolingual root canals of remaining 30 teet...

Beheshteh Malekafzali, Fatemeh Mashhadi Abbas, Ghassem Ansari, Reza Yarmohammadi,

Objectives: This study aimed to investigate dentinal crack rate following parapulpal pin insertion in anterior primary teeth. Methods: Thirteen sound freshly extracted primary canine teeth were horizontally sectioned 1 mm above the cementoenamel junction (CEJ). All samples were thoroughly inspected to ensure that the teeth had no cracks. The teeth were then mounted in acrylic blocks...

Journal: :Biomaterials 2005
J J Kruzic R K Nalla J H Kinney R O Ritchie

Although the propagation of fatigue cracks has been recognized as a problem of clinical significance in dentin, there have been few fracture mechanics-based studies that have investigated this issue. In the present study, in vitro cyclic fatigue experiments were conducted over a range of cyclic frequencies (1-50 Hz) on elephant dentin in order to quantify fatigue-crack growth behavior from the ...

2016
Himanshu Dixit Manoj Nair Nitin Shah Varsha Pandit

ROOT CANAL INSTRUMENTATION

Journal: :Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.] 2003
David J Clark Cherilyn G Sheets Jacinthe M Paquette

UNLABELLED The diagnoses of cracked teeth and incomplete coronal fracture have historically been symptom based. The dental operating microscope at 16x magnification can fundamentally change a clinician's ability to diagnose such conditions. Clinicians have been observing cracks under extreme magnification for nearly a decade. Patterns have become clear that can lead to appropriate treatment pri...

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