Chapter 7 HIGH YIELD

What is the standard of care for rubber dam usage during endodontic treatment in Canada and the US?

Mandatory

What key advantage of rubber dam usage prevents instrument ingestion and aspiration?

Patient Safety

What key advantage of rubber dam usage creates an aseptic field to increase RCT success?

Infection Control

What key advantage of rubber dam usage retracts the lips, cheek, and tongue to provide an unobstructed view?

Visibility and Efficiency

What key advantage of rubber dam usage serves as a barrier against aerosols, saliva, and blood to reduce cross-infection?

Clinician Protection

What legal implication in Canada is associated with failing to use a rubber dam during endodontic treatment?

Negligence

What should you do if visualization of crown anatomy is needed before placing the rubber dam?

Prepare initial access without the dam

Why is straight-line access important in endodontic access openings?

Minimizes file stress and fracture risk

What is outline form?

Outline fIdeal access shape and location based on pulp-chamber anatomyorm

What form of access opening is defined as a modified outline to accommodate instrument orientation or unusual root anatomy?

Convenience form

What is the recommended outline shape for a maxillary central incisor?

Rounded triangle

What is the recommended outline shape for a maxillary lateral incisor?

Rounded triangle or oval

What is the recommended outline shape for a maxillary canine?

Oval or slot

What is the recommended outline shape for maxillary premolars?

Oval or slot

What is the recommended outline shape for maxillary molars?

Triangle in mesial half

Where is the base located in the outline shape of a maxillary molar access opening?

Facial

Where is the apex located in the outline shape of a maxillary molar access opening?

Lingual

What structure must be preserved when creating access for a maxillary molar?

Transverse or oblique ridge

How far mesiolingual to MB1 is the MB2 canal typically located in maxillary molars?

1 to 3 mm

What pulp-chamber floor shape resembles a figure-8?

Ribbon

What pulp-chamber floor shape resembles a bowling-pin?

Bowling-pin

What Vertucci classification type describes a single canal from the pulp chamber to the apex?

Type I

What Vertucci classification type describes two separate canals leaving the chamber that merge short of the apex to form a single canal?

Type II

What Vertucci classification type describes a single canal that divides into two and subsequently merges to exit as one?

Type III

What Vertucci classification type describes two distinct canals from the pulp chamber to the apex?

Type IV

What Vertucci classification type describes a single canal leaving the chamber and dividing into two separate canals at the apex?

Type V

What Vertucci classification type describes two separate canals leaving the chamber, merging in the body, and dividing again short of the apex?

Type VI

What Vertucci classification type describes a single canal that divides, merges, and exits into two distinct canals short of the apex?

Type VII

What Vertucci classification type describes three distinct canals within one root from the pulp chamber to the apex?

Type VIII

In which teeth do C-shaped canals most commonly occur?

Lower second molars

What developmental failure during root formation causes C-shaped canals?

Failure of Hertwig's epithelial root sheath to fuse

Which canals most commonly fuse in a lower second molar with a C-shaped canal?

Mesiobuccal and distal canals

Which canals most commonly fuse in maxillary molars with a C-shaped canal?

Mesiobuccal and palatal canals

How many roots do maxillary central and lateral incisors typically have?

1 root

What percentage of maxillary 1st premolars have 2 roots?

55 percent

What percentage of maxillary 2nd premolars have 1 root?

86 percent

How many roots do maxillary molars have?

3 roots

What are the names of the three roots found in maxillary molars?

Mesiobuccal, distobuccal, palatal

What is the typical number of roots in mandibular incisors?

1 root

What percentage of mandibular 1st premolars have 1 root?

97 percent

What percentage of mandibular 2nd premolars have 1 root?

85 percent

How many roots do mandibular 1st molars typically have?

2 roots

What are the names of the two roots in mandibular 1st and 2nd molars?

Mesial and distal

What percentage of mandibular 2nd molars have 2 roots?

79 percent

What is the typical number of canals in a maxillary central incisor?

1 canal

What is the typical number of canals in a maxillary canine?

1 canal

What is the most common number of canals in a maxillary 1st premolar?

2 canals

What is the most common number of canals in a maxillary 2nd premolar?

1 canal

What percentage of maxillary 1st molars have a present MB2 canal?

60 to 80 percent

What is the most common number of roots in mandibular 2nd molars?

2 roots

What is the prevalence of C-shaped canals in mandibular 2nd molars overall?

8 to 10 percent

In which population is the prevalence of C-shaped canals in mandibular 2nd molars higher?

Asian populations

What is the canal anatomy of mandibular 3rd molars considered to be?

Highly unpredictable