نتایج جستجو برای: canal wall reconstruction
تعداد نتایج: 320365 فیلتر نتایج به سال:
OBJECTIVE The objective of this study was to compare the smear layer formed on root canal walls during canal preparation of extracted human teeth by Twisted, Mtwo, and ProTaper rotary nickel titanium instruments. MATERIALS AND METHODS Sixty single rooted human premolar teeth with root curvature <25(0) were selected and randomly divided into three Groups (n= 20 teeth per Group). Three types of...
This paper presents a novel image processing procedure dedicated to the automated detection of the medial axis of the root canal from dental micro CT records. The 3D model of root canal is built up from several hundreds of parallel cross sections, using image enhancement and an enhanced fuzzy cmeans based partitioning, center point detection in the segmented slice, three dimensional inner surfa...
BACKGROUND AND PURPOSE There is a wide range of normal variation is sphenoid sinus development, especially in the size of the lateral recesses. The purpose of this study was to determine imaging characteristics that may help differentiate between opacification of a developmentally asymmetric lateral recess and a true expansile lesion of the sphenoid sinus. METHODS Coronal CT was performed in ...
PURPOSE To determine the relative contributions to aqueous outflow resistance of the tissues distal to the inner wall of Schlemm's canal. METHODS While performing constant pressure perfusion at 10 mm Hg, a 193-nm excimer laser (Questek) was used to precisely remove portions of sclera, unroofing Schlemm's canal while leaving the inner wall intact. The laser beam was masked to produce a beam 2 ...
This article describes a one-step root canal treatment and restoration of canine teeth in ferrets. Standard brass posts were used for the reconstruction of the teeth. The procedures were performed by dentists according to all rules and procedures used in root canal treatment in humans. The teeth were immediately restored anatomically. The procedures were successfully performed in four ferrets a...
Sometimes things aren’t either-or, but a little of both. That turns out to be the case for Schlemm’s canal (Figure 1), a tiny but vital structure that drains fluid from the eye, keeping it healthy and preventing the build-up of pressure that can lead to glaucoma. Using an innovative combination of approaches, Krishnakumar Kizhatil, Simon John, and colleagues show that the development of Schlemm...
BACKGROUND Apocrine hydrocystomas arising in the external auditory canal are very rare. In this report a clinical case of apocrine hydrocystoma located in the cartilaginous part of the external auditory canal is presented. CASE PRESENTATION A 64-year-old Caucasian female patient presented with a solitary nodule, located in the outer part of the external ear canal after repeated episodes of ex...
The current study shows in a close-up view anatomical relationship between the subarcuate canal and the osseous labyrinth. For this purpose we used micro-computed tomography which allowed performing three-dimensional reconstruction of the subarcuate canal and gave adequate data for estimation its diameter across its course. The diameter of the middle part (the most uniform) of the subarcuate ca...
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