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level: APPLIED ANATOMY OF THE ROOT

Questions and Answers List

level questions: APPLIED ANATOMY OF THE ROOT

QuestionAnswer
It is where the pulp is located and found at the center of the tooth; It is unique for every tooth and is highly variableROOT CANAL SYSTEM
Common teeth to expose pulp hornsmn 1st premolars and molars in young patients
encloses the coronal pulppulp chamber
houses the radicular pulproot canal
highest area following the cuspspulp horn
minute structures leading to PDLRC, LC, AC
part of the root canal system not seen in some cases; formed by the branchin pattern of lateral and apical canalsApical delta
basis of access prepEnamel triangle
accentuation of cementum towards pulp chamber insideLINGUAL SHELF
Average distance of apical constriction0.5-.0.7mm
Safety clearance/allowance0.5 to 1 mm
delineation between pulp tissue (ends) and PDL (starts)CDJ
Terminate working length at ______ in order to have ______Apical Constriction; APICAL STOP
The shape of the pulp chamber and the outline of the canals is a reflection of the outline of thesurface of the crown and root.
DIFFERENCE BETWEEN THE ROOF AND THE FLOOR:roof locationCervical 3rd of the crown
DIFFERENCE BETWEEN THE ROOF AND THE FLOOR:roof coloryellowish
DIFFERENCE BETWEEN THE ROOF AND THE FLOOR:roof dentinal mapAbsent
DIFFERENCE BETWEEN THE ROOF AND THE FLOOR:roof textureRough, no definite shape
DIFFERENCE BETWEEN THE ROOF AND THE FLOOR: floor locationcervical 3rd of the root
DIFFERENCE BETWEEN THE ROOF AND THE FLOOR: floor colordarker
DIFFERENCE BETWEEN THE ROOF AND THE FLOOR: floor dentinal mappresent
DIFFERENCE BETWEEN THE ROOF AND THE FLOOR: floor textureSmooth, convex
METHODS OF STUDYING THE ANATOMY OF THE ROOT CANAL: This technique is done by thinning down the tooth structure longitudinally or cross sectionally with carborandum stone/separating diskGround section
METHODS OF STUDYING THE ANATOMY OF THE ROOT CANAL: The tooth is decalcified using hydrochloric acid and thinned down using microtome; Can be stained furtherHistologic
METHODS OF STUDYING THE ANATOMY OF THE ROOT CANAL: A two dimensional picture of a three dimensional objectRadiographic
METHODS OF STUDYING THE ANATOMY OF THE ROOT CANAL(disadvantage): histologictrue features of the canal might be destroyed during processing
METHODS OF STUDYING THE ANATOMY OF THE ROOT CANAL(disadvantage): ground sectionMight destroy the real features of the anatomy
METHODS OF STUDYING THE ANATOMY OF THE ROOT CANAL(disadvantage): radiographiconly the dimensions is seen but not the depth
METHODS OF STUDYING THE ANATOMY OF THE ROOT CANAL(disadvantage): Computed tomography (CT)radiation exposure is high
METHODS OF STUDYING THE ANATOMY OF THE ROOT CANAL: he tooth is decalcified with 10% HCI and the canal is injected with Methylene blue and cleared with Methyl Methacrylate (Oil of Wintergreen), making the tooth transparentClearing Technique
METHODS OF STUDYING THE ANATOMY OF THE ROOT CANAL: The tooth is decalcified and injected with a fast setting fluid acrylic and the tooth is split to expose the hardened impression of the internal anatomy.Acrylic cast/silicone injection
METHODS OF STUDYING THE ANATOMY OF THE ROOT CANAL: New image reconstruction techniques provide information of the root canal anatomy in three dimension; No need to reexpose patient for potential retakesComputed tomography (CT)
Irritants:results in small pulp chamberpulp stone
Irritants:causes changes in the dentinal wall (wider)internal resorption
Irritants:would lead to a canal orifice that is black, small pulp chambercalcifiction
APEXOGENESIS/APEXIFICATION: Pulp is vitalAPEXOGENESIS
APEXOGENESIS/APEXIFICATION: Formation/growth of apexAPEXOGENESIS
APEXOGENESIS/APEXIFICATION: Retain vitality of pulpAPEXOGENESIS
APEXOGENESIS/APEXIFICATION: CaOH: tertiary dentin formationAPEXOGENESIS
APEXOGENESIS/APEXIFICATION: RCT, fill the areaAPEXIFICATION
APEXOGENESIS/APEXIFICATION: Arrest/stop the progression and seal the canalAPEXIFICATION
APEXOGENESIS/APEXIFICATION: treatment for apex that is not fully formedAPEXIFICATION
Developmental Anomalies: a severe bend or distortion Of a tooth root and crown 45-90 degrees; Final obturation is importantDilacerations
Developmental Anomalies: has exaggerated long pulp chamber and long crown; bifurcation of root is lower toward apicalTaurodontism (bull or prism teeth)
Developmental Anomalies: tooth within a tooth appears in the coronal third of the toothDens en dente (dens invaginatus)
Developmental Anomalies: big sized crown usually located in central incisors and canineMacrodontia
Developmental Anomalies: small sized crown usually located in maxillary lateral and third molarMicrodontia
wearing away of tooth structure caused by grinding, old age, There is deposition of cementum (cementosis) on the root portion of the toothAttrition
wearing away of tooth structure caused by mechanical meansAbrasion
wearing away of tooth structure caused by chemicalErosion
Impact from trauma:causes widening of the root canalInternal resorption
Impact from trauma:may cause the remaining area Of the tooth to have an exposed pulp on the radicular area poor prognosisExternal resorption
Internal resorption txthermoplastic gutta percha wider radicular area
External resorption txExtraction can be done if tooth is already perforated
VERTUCCI'S CANAL CONFIGURATION: A single canal extends from the pulp chamber to the apexTYPE I
VERTUCCI'S CANAL CONFIGURATION: two separate canals leave the pulp chamber and join short of the apex to form one canal.; premolar (mb root ng molar)TYPE II
VERTUCCI'S CANAL CONFIGURATION: One canal leaves the pulp chamber and divides into two in the root; the two then merge to exit as one canalTYPE III
VERTUCCI'S CANAL CONFIGURATION: Two separate, distinct canals extend from the pulp chamber to the apex.; mx first pmTYPE IV
VERTUCCI'S CANAL CONFIGURATION: One canal leaves the pulp chamber and divides short of the apex into two separate, distinct canals with separate apical foramina; mx first/second pm; mn second pmTYPE V
VERTUCCI'S CANAL CONFIGURATION:Two separate canals leave the pulp chamber, merge in the body of the root, and separate short of the apex to exit as two distinct canals. (middle 3rd join)TYPE VI
VERTUCCI'S CANAL CONFIGURATION:One canal leaves the pulp chamber, divides and then rejoins in the body of the root, and finally separates into two distinct canals short of the apex (join at border of middle third and apical third)TYPE VII
VERTUCCI'S CANAL CONFIGURATION:Three separate, distinct canals extend from the pulp chamber to the apexTYPE VIII
A narrow passage connecting two larger structuresISTHMUS
TYPE I1-1
TYPE II2-1
TYPE III1-2-1
TYPE IV2-2
TYPE V1-2
TYPE VI2-1-2
TYPE VII1-2-1-2
TYPE VIII3-3