Search results for "apical constriction"

showing 3 items of 3 documents

Three-dimensional analysis of the physiological foramen geometry of maxillary and mandibular molars by means of micro-CT.

2017

The aim of this study was to investigate the physiological foramen diameter, shape and distance between physiological and anatomical apex of maxillary and mandibular first and second molars. Accurate knowledge of the physiological foramina morphology; thus, inherent mechanical shaping technical hindrances, is decisive when taking the corresponding root canal final preparation decision. The morphological dimensions of a total of 1727 physiological foramina were investigated by means of micro-computed tomography. Mean narrow and wide (to a high number, oval) diameters of the physiological foramen were 0.24, 0.22 and 0.33 mm and 0.33, 0.31 and 0.42 mm in mesiobuccal (MB), distobuccal (DB) and …

0301 basic medicineMolarThree dimensional analysisRoot canalDecision MakingDentistry610 Medicine & healthIn Vitro TechniquesMandibular first molarMandibular second molar03 medical and health sciencesmaxillary and mandibular molars morphology0302 clinical medicineTooth Apexstomatognathic system10066 Clinic of Conservative and Preventive DentistryForamenmedicineHumansapical constrictionphysiological foramenmicro-computed tomography610 Medicine & healthGeneral DentistryMathematicsbusiness.industryDistobuccalX-Ray Microtomography030206 dentistryMolar3500 General DentistryApex (geometry)030104 developmental biologymedicine.anatomical_structureOriginal ArticleDental Pulp Cavitybusinessfinal apical fileRoot Canal Preparation
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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.

Molarbusiness.industryReproducibility of ResultsWaterDentistryApical constrictionMolarRoot Canal TherapyApex (geometry)Evaluation Studies as TopicHumansOdontometryDental Pulp CavityTooth RootbusinessGeneral DentistryMathematicsJournal of Endodontics
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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 …

OrthodonticsDental InstrumentsAnalytical chemistryApical constrictionEquipment DesignElectronics MedicalApex (geometry)Tooth ApexForamenHumansIn vitro studyGeneral DentistryRoot Canal PreparationMathematicsJournal of Endodontics
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