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level: BIOMECHANICAL PREPARATIONS

Questions and Answers List

level questions: BIOMECHANICAL PREPARATIONS

Question	Answer
sequence of treatment for the pulp of a tooth whose end result is the elimination of infection and protection of the decontaminated tooth from future microbial invasion	Endodontic therapy
Role of RCT	reduce the number of MO's to a non-critical level of infection; chemomechanical preparation
proper obturation =	good apical seal
good restoration =	good coronal seal
Systematic procedure of removing pulp tissue, debris and microorganisms with the use of files, irritants and chemicals while shaping to facilitate filling of the root canal system	Canal Preparation
OBJECTIVES OF CANAL PREPARATION	biologic and mechanical
done to free the root canal system of pulp, bacteria, and their endotoxins	CANAL CLEANING
canal cleaning is done by	extirpation, debridement, disinfection
removal of vital pulp	Extirpation
removal of end products of inflammation	Debridement
removal /destruction of pathogenic microorganism	Disinfection
Removal of all necrotic pulp tissue	Pulp extirpation
used to remove all vital pulp	Barb broach
TRUE OR FALSE:Broach must fit at the apical 3rd of the tooth	FALSE
TRUE OR FALSE: Must be no resistance at the broach or else it will break	TRUE
TRUE OR FALSE: Basis of the tentative working length is at the access prep and to that of the root end	FALSE
TRUE OR FALSE: The broach is withdrawn about 1mm and is rotated 360 to engage the pulp tissue; then it is withdrawn again to move the tissue	TRUE
TRUE OR FALSE: Cases with large canals may use 2 broaches	TRUE
CAUSES OF PROFUSE BLEEDING	incomplete removal of pulp and aggressive use of sodium hypochlorite
most common cause of profuse bleeding in non-vital teeth	aggressive use of sodium hypochlorite
TRUE OR FALSE: you can also use a paper point to get the working length	TRUE
most common teeth invoved in perforation	incisors and 1st mandibular molars
CANAL SHAPING: Preserving the _____or ____ configuration of the root canal	natural; original
CANAL SHAPING: Creates a _______cone	continuously tapering
CANAL SHAPING:Make the apical terminus the narrowest cross section providing ____	apical stop
CANAL SHAPING:Prepare the canal in ____ planes	multiple
Faciliates cleaning by removing restrictive dentin, allows greater volume of irrigant to work deeper and into all aspects of the root canal system thus, eliminating the pulp, bacteria their endotoxins	canal shaping
Carves away restrictive dentin and sculpt a preparation that is thoroughly cleaned and prepared for obturation in three-dimensions	canal shaping
this hinders proper instrumentation	anatomic problems
TRUE OR FALSE: root canal may divide, rejoin and possess lateral ramifications	TRUE
TRUE OR FALSE: the number of roots = the number of canals	FALSE
TRUE OR FALSE: All canals are curved especially in the middle third	FALSE
TRUE OR FALSE: In conical roots, canal may lie closer to the bifurcation side of the root	FALSE
TRUE OR FALSE: Majority of mandibular molars have flat roots	TRUE
TRUE OR FALSE: flat roots have figure of 8 canal	TRUE
Canal Preparation Technique:Orifice opening and enlargement	Coronal preparation
Canal Preparation Technique:Establish tentative working length	Coronal preparation
Canal Preparation Technique:File handle is moved gently in a push and pull motion, and this action is repeated until the #10 file moves easily to preestablished length	Canal patency or glide path
Canal patency or glide path:File handle is moved gently in a _______ motion, and this action is repeated until the #10 file moves easily to preestablished length	push and pull
When you can insert the smallest file up until the apex	Canal patency
insert and remove the file in ease	Glide path
Canal Preparation Technique:Determining/ negotiating the restrictive canals	Scouting
Canal Preparation Technique:Procedure which involves insertion of small diameter files to evaluate cross sectional diameter of a canal	Scouting
Canal Preparation Technique:provide information as to whether the canal is open, partially restricted, or calcified also if they merge, curve, recurve, dilacerate or divide.	Scouting
Canal Preparation Technique:Checks presence of a straight line access through the position of the file if it is parallel to long axis or skewed off	Scouting
Canal Preparation Technique:Procedure which involves flaring of the coronal 2/3 prior to apical preparation with the serial use of larger to smaller instruments	Radicular preparation
Canal Preparation Technique: Enlarging the canal orifice in order to negotiate the apical region	Radicular preparation
Methods of establishing WL:What is felt at the the apical region; not reliable	tactile sensation
Methods of establishing WL:used during or after canal preparation	paper point evaluation
Methods of establishing WL:Dry the root canal, if there is bleeding then you may use it to measure; not reliable	paper point evaluation
Methods of establishing WL:most reliable; reading form the machine itself	electronic apex locator
Methods of establishing WL:Traditional way in determining the WL	use of radiograph
usually a cusp or incisal edge	Reference point
distance from a reference point to the radiographic root apex	Radiographic tooth image
Makes use of the cusp tip and the root end;Also known as tooth length	Radiographic tooth image
Located 5 to 1mm from the radiographic root apex where you can find the cementodentinal junction (CDJ)	Apical constriction
Distance from a reference point to the apical end of the canal constriction	Working Length (WL)
The actual length of the IAF inserted inside the canal for working length determination	Actual wire length (AWL)
If the discrepancy is more than 2mm please __- WL computation	repeat
Canal Preparation Technique:Measure the length of the tooth from pre-operative radiograph. Subtract 1-2 mm from this length to compensate for the distortions	Working length determination
Canal Preparation Technique:Select initial apical file (IAF) should reach the estimated trial WL biggest file that should reach the apical resistance/snug fit at the end of the canal	Working length determination
SF= Safety factor (equivalent to 1 ) for _____	radiographic errors
SA= Safety allowance (equivalent to 1) for ____	apical constriction
Canal Preparation Technique:Schedule your file from your initial apical file	Apical preparation/Serial filing
Motions of Instrumentation:Quarter turn (CW) rotation and pull	Turn and pull
Motions of Instrumentation:push and pull	filing
Motions of Instrumentation:About 30-60 degrees CW and counterclockwise movement of the instrument	watch winding
Motions of Instrumentation: About 90 degrees CW rotation of the instrument andabout 270 degrees CCW rotation with slight apical pressure	balanced force
Motions of Instrumentation:Incorporated with rotary instruments	recapitulation
Motions of Instrumentation:Reinsertion/reuse of an instrument previously used to renegotiate the original WL	Recapitulation
biggest file used up to the WL	Master apical file
minimum size of MAF is __ for narrow canals	25
Canal Preparation Technique:Sequential use of successively smaller to larger sizes of instruments to prepare the canal at millimeter increments progressing coronally from an apical preparation	Step-back preparation
Canal Preparation Technique:Body of the canal is prepares using subsequent larger files, 1-2 mm short of the WL	Step-back preparation
Canal Preparation Technique: Instrumentation progresses coronally, then recapitulate	Step-back preparation
Canal Preparation Technique:Decreasing the working length	Step-back preparation
Canal Preparation Technique:Use of MAF to smoothen all the canal walls	Circumferential filing
to ensure the step back preparation	Spreader reach test
This is done to verify if the canal has been properly flared	Spreader reach test
Spreader reach test: The length of the spreader should be at least ___mm short of the WL	1 to 2
Insert MAF together with the spreader inside the canal	Spreader reach test
Spreader reach test:Use size __of spreader for larger canals	30
Spreader reach test: use of size __for smaller canals	25