Chapter 10 HIGH YIELD

What are the main access preparation errors in endodontics?

Lateral root perforation and furcation perforation

What are the main cleaning and shaping errors in endodontics?

Ledge formation, lateral midroot perforations, stripping perforation, and apical perforation

How is a ledge bypassed during canal instrumentation?

By making a small bend at the tip of the instrument and passing it along the canal wall

What is a radicular zip with perforation?

An apical procedural error combining a zipping deviation with a perforation

What is a ledge with perforation?

An apical procedural error combining a canal ledge with a perforation

What factors affect the prognosis of a root perforation?

Location of the perforation, size of the perforation, time elapsed before repair, pulpal diagnosis, and repair material used

What is the pulpal diagnosis prognosis factor for root perforation?

Pulp necrosis leads to a worse prognosis as bacterial toxins infiltrate periodontal tissues

Why does pulp necrosis cause a worse prognosis in root perforations?

Bacterial toxins can infiltrate periodontal tissues leading to inflammation and destruction

What is widely regarded as the material of choice for repairing root perforations due to its biocompatibility and sealing ability?

Mineral Trioxide Aggregate

What are the major procedural accidents covered besides perforations and ledges?

Instrument fracture, sodium hypochlorite accident, and cervicofacial subcutaneous emphysema

What location is associated with lateral root perforation in the coronal third above the crestal bone?

Coronal third above crestal bone

What is the cause of lateral root perforation during access preparation?

Errors during access preparation

How is a lateral root perforation in the coronal third above the crestal bone managed?

Repair with amalgam, GIC, or composite

What is the prognosis of a lateral root perforation in the coronal third above the crestal bone?

Good

Where is lateral root perforation located when it occurs in the coronal third below the crestal bone?

Coronal third below crestal bone

How is a lateral root perforation in the esthetic zone managed?

Orthodontic root extrusion

How are lateral root perforations in non-esthetic areas managed below the crestal bone?

Surgical crown lengthening

How is an internal lateral root perforation managed?

Repair with MTA

What is the prognosis of a lateral root perforation in the coronal third below the crestal bone?

Poor

Where does furcation perforation typically occur?

Furcation

What causes furcation perforation?

Searching for canal orifices

How is furcation perforation managed?

Immediate repair with MTA

What is the prognosis of furcation perforation if repaired immediately?

Good

Where does stripping perforation typically occur?

Midroot especially on mesial roots

What causes stripping perforation?

Over-flaring during cleaning and shaping

What is the prognosis of stripping perforation?

Poor

Where does a lateral midroot perforation occur?

Midroot

What causes a lateral midroot perforation?

Aggressive instrumentation or post space preparation

How is a lateral midroot perforation managed if apical negotiation fails?

Clean, shape, and obturate the coronal portion

What is the prognosis of a lateral midroot perforation?

Variable

What defines a ledge formation error in canal obturation?

Canal irregularity preventing full length access

What causes ledge formation?

Inadequate access, debris, or over-instrumentation

What is the clinical implication of a ledge formation?

Canal blockage preventing complete obturation

What is the textbook insight or note for bypassing a ledge?

Bypass with pre-curved #10 SS file in picking motion; better if short and pulp is vital

What defines an apical perforation error?

Perforation located at the apex of the root

What causes an apical perforation?

Over-instrumentation or working length errors causing zipping or blow-out

What is the clinical implication of an apical perforation?

Loss of apical stop and extrusion of materials

What is the textbook insight or note for managing an apical perforation?

Set new working length 1 to 2 mm short, create apical seat, obturate to new working length, and use MTA barrier if needed

What defines instrument fracture as a procedural error?

Separation of an instrument within the canal

What causes instrument fracture?

Torsional stress or cyclic fatigue

What is the clinical implication of instrument fracture?

Blocked canal space preventing complete cleaning, shaping, and obturation

What is the textbook insight or note for managing instrument fracture?

Attempt ultrasonic removal; if fails, bypass or obturate to fragment

What defines a sodium hypochlorite accident?

Extrusion of sodium hypochlorite beyond the root apex into periapical tissues

What causes a sodium hypochlorite accident?

Forceful irrigation through a wedged needle or a perforation

What is query-response for managing a sodium hypochlorite accident?

Administer analgesics, apply cold compresses, and prescribe antibiotics if severe

What defines cervicofacial subcutaneous emphysema?

Air trapped in the facial soft tissues

What causes cervicofacial subcutaneous emphysema?

Use of an air-driven handpiece or compressed air during the procedure

What is the management for cervicofacial subcutaneous emphysema?

Prescribe antibiotics to prevent secondary infection

What is the prognosis of cervicofacial subcutaneous emphysema?

Good

What is under-filling in root canal obturation?

Incomplete obturation of the canal space in any dimension, including presence of voids

What causes under-filling?

Poor condensation, inadequate length control, or complex canal anatomy

What is the clinical implication of under-filling?

May harbor bacteria leading to persistent infection or failure

What is a key note regarding under-filling?

Voids allow leakage and reduce the seal, compromising long-term success

What is under-extension in root canal obturation?

Filling material ends short of the apical foramen due to apical blockage

What causes under-extension?

Inaccurate working length determination or apical blockage

What is the clinical implication of under-extension?

Leaves part of the canal unfilled

What is the ideal distance for filling material from the apex during obturation?

Within 0.5 to 1.0 mm from the apex

What is over-extension in root canal obturation?

Core filling extends beyond the apical foramen without completely obturating the canal

What causes over-extension?

Over-instrumentation, loss of apical stop, or excessive pressure during filling

What is the clinical implication of over-extension?

May cause periapical irritation and inflammation, and ineffective seal coronally

What is a key note regarding over-extension?

Promotes bacterial growth past the apex; often confused with overfilling but implies incomplete canal obturation according to Ingle

What is over-filling in root canal obturation?

Filling material extends beyond the apical foramen and the canal is completely obturated

What causes over-filling?

Over-instrumentation, no apical stop, or excessive gutta-percha extruded

What is the clinical implication of over-filling?

May cause post-op pain, periapical inflammation, or foreign body reaction

What is a key note regarding over-filling?

Should be avoided as studies show reduced prognosis in cases of overfilling