Access Cavity for Maxillary Central Incisor

16 Questions

What is the location of the pulp chamber in premolars?

At the center of the occlusal surface between buccal and lingual cusp tips

What is the purpose of the DG 16 instrument?

To locate canal orifices and determine canal angulation

What should be removed from the pulp chamber before radicular preparation?

All of the caries, debris, and necrotic material

What is the function of the endodontic spoon excavator?

To excavate the base of the pulp chamber

How many roots are typically present in premolars?

Two roots with three canals

What can occur if calcified or metallic debris is left in the pulp chamber?

The canal may be obstructed

What is the purpose of the 'drop in' feeling during access cavity preparation?

To locate the canal orifices

What is the direction of movement of the round bur during access cavity preparation?

Buccolingual direction

What is the shape of the access cavity for a maxillary central incisor?

Rounded triangular with base facing the incisal aspect

What is the main difference between the access cavity of a maxillary lateral incisor and a maxillary central incisor?

Size of the access cavity

What is the shape of the access cavity for a maxillary canine?

Oval shape with greater diameter labiopalatally

What is the main difference between the access cavity of a mandibular incisor and a maxillary incisor?

Shape of the access cavity

What is the shape of the access cavity for a mandibular canine?

Oval shape with greater diameter labiopalatally

What is the error caused by failure to notice the lingual axial inclination of anterior teeth?

Gouging of the labial wall

What is the error caused by failure to complete the convenience extension toward the incisal prior to the entrance of the shaft of the bur?

Labiocervical perforation

What is the error caused by failure to remove pulp debris due to incisally under-extended cavity?

Discoloration of the crown

Study Notes

Maxillary Central Incisor

Access cavity is rounded triangular in shape with base facing the incisal aspect
Width of the cavity depends on the distance between mesial and distal pulp horns
Shape may change to oval in mature teeth due to less prominent pulp horns

Maxillary Lateral Incisor

Shape of access cavity is similar to maxillary central incisor but smaller in size
Rounded triangular or oval shape

Maxillary Canine

Access cavity shape is oval with greater diameter labiopalatally
No pulp horns present in canines

Mandibular Incisors

Access cavity is smaller in size compared to maxillary incisors
Shape is long oval with greater diameter incisogingivally
Different from maxillary incisors in size and shape

Mandibular Canine

Access cavity is similar to maxillary canine but smaller in size
Root canal outline is narrower in mesiodistal dimension
Two canals are often present in mandibular canine

Errors during Endodontic Cavity Preparation

Gouging the labial wall due to failure to notice lingual axial inclination
Gouging the distal wall due to failure to notice mesial axial inclination
Labiocervical perforation due to incomplete convenience extension
Discoloration of the crown due to failure to remove pulp debris
Errors in intraradicular cavity preparation due to incomplete authority over enlarging instruments

Access Cavity Preparation for Premolars

Pulp chamber is located between buccal and lingual cusp tips
Two pulp horns are located within the peaks of their cusps
Penetrate enamel with No. 4 round bur directed parallel to long axis of tooth
Remove roof of pulp chamber using a round, tapered fissure or non-end cutting bur

Toilet of the Cavity

Remove all caries, debris, and necrotic material from the pulp chamber
Debris left in the chamber can obstruct the canal and increase bacterial population

Instruments for Access Cavity Preparation

Endodontic Explorer: helps locate canal orifices and determine canal angulation
DG 16: designed to identify canal orifices and determine canal angulation
Endodontic Spoon Excavator: used to excavate the base of the pulp chamber

This quiz covers the anatomy of access cavities for maxillary central incisors and lateral incisors, including their shape, size, and relationship to pulp horns.

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