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Endo 1

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robbypowell's version from 2016-01-26 16:05

5

Question Answer
Working Length: The distance from a _____ reference point to the point at which _____ _____ and _______ should terminateCoronal; Canal Preparation & Obturation
(working length) The goal for termination of instrumentation and obturation is the _____ _____Apical Constriction
T/F: ideal endodontic treatment does not extend through the apexTrue
T/F: ideal endodontic treatment extends through the apexFalse
According to Found and Reid (2000), Best results for determining working length obtained when combination of what two methods?radiograph & apex locator
4 radiographic limitations for using radiographs for determining working length from radiographs (exclusively)Distortion, Magnification error(up to 5.4% w/ paralleling technique) Interpretation variability, Lack of 3-D representation
T/F: the Apical Foramen is always at the apex of the toothFalse (often a millimeter or more from apex)
T/F: the Apical foramen is not always found at the apex of the toothTrue (often a millimeter or more from apex)
T/F the Anatomical Apex and the Apical foramen are synonymousFalse (anatomical apex is apical most point of tooth... not necessarily point of foramen)
T/F the Anatomical Apex and the Apical foramen are not synonymousTrue (anatomical apex is apical most point of tooth... not necessarily point of foramen)
The "major diameter" is related to the Apical _____Foramen
The "minor diameter is related to the Apical _____Constriction
Define: The apical portion of the root canal having the narrowest diameterApical Constriction (minor diameter)
Define: The linear circumference on the root surface at the apical end of the canalApical Foramen (major diameter)
Define: The point at which the dentin and the cementum meetwithin the canalCemento-Dentinal Junction (CDJ)
The average distance from anatomical apex to most coronal portion of the apical foramen is _____ mm0.59 mm
Freq. of teeth with foramen that deviate from anatomic apex is an avg. of ___ %92.4% (so almost all)
Burch and Hulen’s Measurement is what?distance from anatomical apex to most coronal portion of the apical foramen
avg Distance between the apical constriction (minor diameter) and apical foramen (major diameter) in YOUNG people0.524 mm
avg Distance between the apical constriction (minor diameter) and apical foramen (major diameter) in OLDER people0.659 mm
(suzuki... apex locator)) Electrical resistance between the oral mucous membranes and the periodontium remained constantly ____ Ω regardless of age or the type or shape of tooth6.5 Ω
Pagavino, Pace, & Baccetti (1998) found accuracy of Root ZX apex locator to be 82.75% within _________ mm from foramen.0.5 mm
NiTi has two crystalline phases: ______, at rest & _____, under stress, torqueAustenite; Martensite
Of the two phases of NiTi, ______ is more susceptible to fracture or deformationMartensite
Rotary files with blue rubber rings have a ___ % taper6% taper
Rotary files with red rubber rings have a ___ % taper4% taper
End Sequence is a “Low Torque” (low friction) instrument. It is sharp and can therefore operate at ____ - ____ RPM.500-600 RPM
T/F: Rotary files should always be rotating within the canalTrue
T/F: rotary files should be turned on and off within the canalFalse (should always be rotating)
Rotary files are made of what alloy?Nickel-Titanium
T/F: Crown-down rotary technique (when getting to working length) starts with small files and works up to largest filesFalse (vice-versa)
T/F: Crown-down rotary technique (when getting to working length) starts with large diameter files and works up to smaller filesFalse (vice-versa)
What formerly used obturation material turned out to be poisonous and carcinogenic?Sargenti
how long do you light cure resilon in the chamber?40 sec
60% of gutta percha's composition is ____ ___Zinc Oxide
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