Search results for "APEX"
showing 10 items of 115 documents
Effect of different mixing and placement methods on the quality of MTA apical plug in simulated apexification model
2017
Background It is necessary apical plug material to exhibit proper adaptation with the root canal walls. Presence of voids at the interface between the root canal wall and this material result in micro leakage, which might have a relationship with post treatment disease. The aim of the present study was to evaluate the effect of different mixing (manual and ultrasonic) and placement (manual and manual in association with indirect ultrasonic) method of Mineral Trioxide Aggregate (MTA) on the void count and dimension in the apical plug in natural teeth with simulated open apices. Material and methods Eighty human maxillary central incisors were selected. After simulation of the open apex model…
Multicolor 3D Printing of Complex Intracranial Tumors in Neurosurgery.
2020
Three-dimensional (3D) printing technologies offer the possibility of visualizing patient-specific pathologies in a physical model of correct dimensions. The model can be used for planning and simulating critical steps of a surgical approach. Therefore, it is important that anatomical structures such as blood vessels inside a tumor can be printed to be colored not only on their surface, but throughout their whole volume. During simulation this allows for the removal of certain parts (e.g., with a high-speed drill) and revealing internally located structures of a different color. Thus, diagnostic information from various imaging modalities (e.g., CT, MRI) can be combined in a single compact …
Evaluation of diagnostic accuracy and dimensional measurements by using CBCT in mandibular first molars
2015
Background: This study aimed to assess the diagnostic accuracy of cone beam computed tomography (CBCT) and quantitatively evaluate the morphology of mandibular first molars using CBCT. Material and Methods: Twenty-four double-rooted mandibular first molars were evaluated by NewTom VGi CBCT. The distance from the furcation and apex to the cementoenamel junction (CEJ), diameter and thickness of canal walls, the buccolingual (BL) to mesiodistal (MD) ratio (ΔD), prevalence of oval canals at different sections and taper of the canals were all determined. In order to assess the diagnostic accuracy of CBCT, distance from the furcation and apex to the CEJ and thickness of canal walls at the CEJ and…
Evaluation of periimplant bone neoformation using different scanning electron microscope methods for measuring BIC. A dog study.
2012
Objetives: The aim of this study was to determine which of three methods for measuring BIC (bone-to-implant contact), using vestibular and lingual scanning electron microscopy (SEM) for different implant systems at 15, 30 and 90 days post-surgery was the most precise. An elemental analysis with SEM was used to evaluate neoformed bone composition for three implant systems at the same study times. Material and Methods: 36 implants were placed in eighteen Beagle dogs mandible about one year old and weighing approximately 12-13 kg in order to evaluate bone apposition to three different implant surfaces. It was used the third and fourth premolar and first molar distal sockets in both quadrants o…
Morphology of the Physiological Foramen: I. Maxillary and Mandibular Molars
2004
Information concerning the anatomy of the physiological foramen is limited. The aim of this study was to investigate the distance between the physiological and anatomical apex, accessory foramina frequency, and the shape and diameter of the physiological foramen in maxillary and mandibular molars. The apical anatomy of 523 maxillary and 574 mandibular molars from an Egyptian population was investigated by means of a computer-aided stereomicroscope (40 x magnification). The following results were obtained:
An in vivo comparative study of two apex locators
1994
Two different electronic apex locators were used before extraction to determine working length in 116 root canals belonging to 34 molars. The results were then compared with postextraction working length measurements. The determinations were made before and after eliminating the canal contents and drying the interior. The results showed that 84.8% and 79.3% of the Odometer, and 89.6% and 88.7% of the Endocater readings for dry and nondry canals, respectively, occurred within the two 0.5-mm intervals closest to the apical constriction.
Zvaigžņotā Debess: 2018, Vasara (240)
2018
Jauna hipotēze par I tipa pārnovu izcelšanos ; No 108 minūtēm līdz 96 dienām ; Maiņzvaigznes (astronomija skolā) ; O.Dumbrājs. Nēteres teorēmai 100 gadu ; K.Švarcs. Jauni novērojumi tālā un tuvā kvazārā ; I.P. Īsumā: ALMA un VLT iegūst liecību par zvaigžņu veidošanos tikai 250 miljonus gadu pēc Lielā Sprādziena ; I.Pundure. Lagūnas miglājs – zvaigžņu bērnistaba Habla skatījumā ; I.Pundure. ALMA un APEX atklāj veidojošos galaktiku megasaplūšanu agrīnajā Visumā ; K.Salmiņš. LU Astronomijas institūts pirmais veicis nanopavadoņa S-NET lāzermērījumus ; J.Jaunbergs. Zeme atpakaļskata spogulī ; J.Jaunbergs. Sniegotā Helēne un mazais Polideiks ; R.Misa. Latvijas uzņēmums Eventech piedalīsies Luna-2…
Influence of Instrument Size on the Accuracy of Different Apex Locators: An In Vitro Study
2008
The aim of this in vitro investigation was to determine the accuracy of 4 different electronic apex locators (EALs) with 3 different instrument sizes. For this study 146 roots were embedded in an agar solution. Electronic measurements were made to the physiologic foramen (apical constriction) with the Elements Apex Locator, Justy II, Raypex 5, and ProPex II and K-type files sizes 08, 10, and 15. Statistical significances were calculated with the sign test (P < .001). Exact measurements to the physiologic foramen were made with the Elements Apex Locator, 36.99%, 39.04%, and 44.93%; Justy II, 38.62%, 32.41%, and 43.41%; Raypex 5, 42.76%, 39.31%, and 39.06%; and ProPex II, 38.62%, 43.45%, and …
Evaluation of Dentaport ZX and Raypex 6 electronic apex locators: an in vivo study
2013
Med Oral Patol Oral Cir Bucal. 2014 Mar 1;19 (2):e202-5. Evaluation of Dentaport ZX and Raypex 6: An in vivo study e202 Journal section: Clinical and Experimental Dentistry Publication Types: Research Evaluation of Dentaport ZX and Raypex 6 electronic apex locators: An in vivo study Saddy Moscoso 1 , Kenneth Pineda 1 , Juan Basilio 1 , Carlos Alvarado 2 , Miguel Roig 2 , Fernando Duran- Sindreu 3 1 MD, Department of Restorative Dentistry and Endodontics, Universitat Internacional de Catalunya, Barcelona, Spain 2 MD, DDS, PhD, Department of Restorative Dentistry and Endodontics, Universitat Internacional de Catalunya, Barcelona, Spain 3 Department of Restorative Dentistry and Endodontics, Un…
Radiographic Investigation of Frequency and Location of Root Canal Curvatures in Human Mandibular Anterior Incisors In Vitro
2007
The aim of the present in vitro study was to evaluate the degree and location of root canal curvatures of mandibular anterior incisors. A total of 396 extracted human permanent anterior incisors (248 central and 148 lateral) were included in this investigation. Exclusion criteria were teeth with extensive carious lesions, restorations, and root canal treatment. The specimens were fixed in a special device and digitally x-rayed (Heliodent MD; Sirona, Benzheim, Germany; Merlin 2.1, Olympus/PerkinElmer, Waltham, MA) with the parallel technique. The distances from the cementoenamel junction (CEJ) to the first curvatures as well as the according angles were recorded. The results were analyzed de…