Buscar
Estás en modo de exploración. debe iniciar sesión para usar MEMORY

   Inicia sesión para empezar

level: BIOMECHANICAL PREPARATIONS

Questions and Answers List

level questions: BIOMECHANICAL PREPARATIONS

QuestionAnswer
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 invasionEndodontic therapy
Role of RCTreduce 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 systemCanal Preparation
OBJECTIVES OF CANAL PREPARATIONbiologic and mechanical
done to free the root canal system of pulp, bacteria, and their endotoxinsCANAL CLEANING
canal cleaning is done byextirpation, debridement, disinfection
removal of vital pulpExtirpation
removal of end products of inflammationDebridement
removal /destruction of pathogenic microorganismDisinfection
Removal of all necrotic pulp tissuePulp extirpation
used to remove all vital pulpBarb broach
TRUE OR FALSE:Broach must fit at the apical 3rd of the toothFALSE
TRUE OR FALSE: Must be no resistance at the broach or else it will breakTRUE
TRUE OR FALSE: Basis of the tentative working length is at the access prep and to that of the root endFALSE
TRUE OR FALSE: The broach is withdrawn about 1mm and is rotated 360 to engage the pulp tissue; then it is withdrawn again to move the tissueTRUE
TRUE OR FALSE: Cases with large canals may use 2 broachesTRUE
CAUSES OF PROFUSE BLEEDINGincomplete removal of pulp and aggressive use of sodium hypochlorite
most common cause of profuse bleeding in non-vital teethaggressive use of sodium hypochlorite
TRUE OR FALSE: you can also use a paper point to get the working lengthTRUE
most common teeth invoved in perforationincisors and 1st mandibular molars
CANAL SHAPING: Preserving the _____or ____ configuration of the root canalnatural; original
CANAL SHAPING: Creates a _______conecontinuously tapering
CANAL SHAPING:Make the apical terminus the narrowest cross section providing ____apical stop
CANAL SHAPING:Prepare the canal in ____ planesmultiple
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 endotoxinscanal shaping
Carves away restrictive dentin and sculpt a preparation that is thoroughly cleaned and prepared for obturation in three-dimensionscanal shaping
this hinders proper instrumentationanatomic problems
TRUE OR FALSE: root canal may divide, rejoin and possess lateral ramificationsTRUE
TRUE OR FALSE: the number of roots = the number of canalsFALSE
TRUE OR FALSE: All canals are curved especially in the middle thirdFALSE
TRUE OR FALSE: In conical roots, canal may lie closer to the bifurcation side of the rootFALSE
TRUE OR FALSE: Majority of mandibular molars have flat rootsTRUE
TRUE OR FALSE: flat roots have figure of 8 canalTRUE
Canal Preparation Technique:Orifice opening and enlargementCoronal preparation
Canal Preparation Technique:Establish tentative working lengthCoronal 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 lengthCanal 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 lengthpush and pull
When you can insert the smallest file up until the apexCanal patency
insert and remove the file in easeGlide path
Canal Preparation Technique:Determining/ negotiating the restrictive canalsScouting
Canal Preparation Technique:Procedure which involves insertion of small diameter files to evaluate cross sectional diameter of a canalScouting
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 offScouting
Canal Preparation Technique:Procedure which involves flaring of the coronal 2/3 prior to apical preparation with the serial use of larger to smaller instrumentsRadicular preparation
Canal Preparation Technique: Enlarging the canal orifice in order to negotiate the apical regionRadicular preparation
Methods of establishing WL:What is felt at the the apical region; not reliabletactile sensation
Methods of establishing WL:used during or after canal preparationpaper point evaluation
Methods of establishing WL:Dry the root canal, if there is bleeding then you may use it to measure; not reliablepaper point evaluation
Methods of establishing WL:most reliable; reading form the machine itselfelectronic apex locator
Methods of establishing WL:Traditional way in determining the WLuse of radiograph
usually a cusp or incisal edgeReference point
distance from a reference point to the radiographic root apexRadiographic tooth image
Makes use of the cusp tip and the root end;Also known as tooth lengthRadiographic 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 constrictionWorking Length (WL)
The actual length of the IAF inserted inside the canal for working length determinationActual wire length (AWL)
If the discrepancy is more than 2mm please __- WL computationrepeat
Canal Preparation Technique:Measure the length of the tooth from pre-operative radiograph. Subtract 1-2 mm from this length to compensate for the distortionsWorking 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 canalWorking 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 fileApical preparation/Serial filing
Motions of Instrumentation:Quarter turn (CW) rotation and pullTurn and pull
Motions of Instrumentation:push and pullfiling
Motions of Instrumentation:About 30-60 degrees CW and counterclockwise movement of the instrumentwatch winding
Motions of Instrumentation: About 90 degrees CW rotation of the instrument andabout 270 degrees CCW rotation with slight apical pressurebalanced force
Motions of Instrumentation:Incorporated with rotary instrumentsrecapitulation
Motions of Instrumentation:Reinsertion/reuse of an instrument previously used to renegotiate the original WLRecapitulation
biggest file used up to the WLMaster apical file
minimum size of MAF is __ for narrow canals25
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 preparationStep-back preparation
Canal Preparation Technique:Body of the canal is prepares using subsequent larger files, 1-2 mm short of the WLStep-back preparation
Canal Preparation Technique: Instrumentation progresses coronally, then recapitulateStep-back preparation
Canal Preparation Technique:Decreasing the working lengthStep-back preparation
Canal Preparation Technique:Use of MAF to smoothen all the canal wallsCircumferential filing
to ensure the step back preparationSpreader reach test
This is done to verify if the canal has been properly flaredSpreader reach test
Spreader reach test: The length of the spreader should be at least ___mm short of the WL1 to 2
Insert MAF together with the spreader inside the canalSpreader reach test
Spreader reach test:Use size __of spreader for larger canals30
Spreader reach test: use of size __for smaller canals25