Ultrasonic Root End Preparation in Endodontics

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What is the primary purpose of the root-end filling?

To remove potentially contaminated debris
To seal the canal system apically and prevent the egress of bacteria (correct)
To promote cementogenesis
To expose the apical collagen fibers

Why should EDTA not be used when mineral trioxide aggregate (MTA) is used as a root-end filling material?

Because it may lead to the staining of periradicular tissues
Because it may cause damage to the surrounding tissues
Because it may interfere with the hard tissue-producing effect of MTA (correct)
Because it may reduce the adhesion of MTA to tooth structure

What is the recommended treatment for the root face after root-end resection?

Inspection to ensure cleanliness
Removal of the smear layer and exposure of the apical collagen fibers (correct)
Drying with paper points
Irrigation with sterile saline or water

What is the optimal exposure of collagen and demineralization achieved with?

A burnishing application of citric acid (pH 1.0) for 3 minutes (C) Signup and view all the answers

What is a crucial requirement for an ideal retrograde filling material?

It should be well tolerated by surrounding tissues (B) Signup and view all the answers

What is the primary purpose of isolating the root-end cavity before filling?

To achieve moisture control (A) Signup and view all the answers

What is the purpose of using vasoconstrictors in the surgical site?

To reduce blood flow and facilitate the procedure (D) Signup and view all the answers

What is the main advantage of using IRM (intermediate restorative material) as a retrograde filling material?

It provides a good seal and milder tissue reaction (B) Signup and view all the answers

What is the correct sequence of steps in the MTA placement technique?

Pack the surrounding bone with a sterile gauze, then mix powder and liquid (D) Signup and view all the answers

What is a common complication associated with the use of amalgam as a retrograde filling material?

Corrosion and persistence of periapical inflammation (D) Signup and view all the answers

What is the primary goal of root resection?

To eliminate the weak, diseased root to allow the stronger ones to survive (A) Signup and view all the answers

What is a contraindication for root resection?

The remaining roots have inadequate periodontal-osseous support (B) Signup and view all the answers

What is the procedure that involves vertical, surgical division of the entire tooth from mesial to distal in maxillary molars?

Hemisection (B) Signup and view all the answers

What is the main factor that determines the prognosis of root resection?

The patient's ability to perform good oral hygiene (D) Signup and view all the answers

What is the procedure that involves penetrating into the pulp space to treat a defect?

Root canal treatment (C) Signup and view all the answers

What is the primary objective of creating a root-end cavity?

To create a cavity into which a root-end filling can be placed (A) Signup and view all the answers

What is the significance of preparing the cavity parallel to the anatomic outline of the pulp cavity?

It allows for better retention form (A) Signup and view all the answers

What is the advantage of using ultrasonic root-end cavity preparation?

It provides better access and smaller size osteotomy (C) Signup and view all the answers

What is the consequence of not removing the isthmus tissues during root-end cavity preparation?

The root-end filling may not seal properly (C) Signup and view all the answers

What is the primary benefit of using ultrasonic root-end cavity preparation in molar roots?

It is effective in the debridement and enlargement of canal anastomoses and irregularities (A) Signup and view all the answers

What is the primary goal of guided tissue regeneration in endodontic surgery?

To prevent apical migration of gingival epithelium and allow tissue derived from the periodontal ligament to repopulate the space adjacent to the denuded root surface (D) Signup and view all the answers

Indications of guided tissue regeneration in endodontic surgery include which of the following?

Large periapical lesions and through and through lesions (B) Signup and view all the answers

Intentional replantation involves which of the following?

Extracting a tooth, correcting its deficiencies outside of the mouth, and replanting it into its original socket (B) Signup and view all the answers

When should intentional replantation be considered?

As a treatment of last resort (A) Signup and view all the answers

What is an indication for intentional replantation?

Absolute inoperable root canal treatment in situ (A) Signup and view all the answers

What is the primary treatment approach for furcation perforation?

Non-surgical repair (B) Signup and view all the answers

What is the recommended treatment for cervical defects that do not penetrate into pulp space?

Envelope flap with curettage and preparation (B) Signup and view all the answers

What is the primary approach for strip perforation repair?

Non-surgical repair (A) Signup and view all the answers

What is the treatment for midroot and apical root perforations?

Root amputation or hemisection (C) Signup and view all the answers

What is the classification of surgical procedures for tooth resection?

Periodontal management (D) Signup and view all the answers

What is the primary indication for hemisection?

Fracture of the tooth across the marginal ridge (A) Signup and view all the answers

What is the goal of bicuspidization?

To open the molar furcation area for easier maintenance and cleaning (D) Signup and view all the answers

What is the outcome of hemisection in the given scenario?

The mesial half of the tooth is retained as a bicuspid (C) Signup and view all the answers

What is the first step in the hemisection procedure?

Raising a sulcular flap without a vertical-releasing incision (C) Signup and view all the answers

What is the purpose of the vertical cut in the hemisection procedure?

To separate the tooth into two segments (D) Signup and view all the answers

What is the contraindication for retaining half of a molar?

Inadequate bony support for the retained half (B) Signup and view all the answers

What is the procedure that involves dividing the clinical crown into two halves?

Bicuspidization (B) Signup and view all the answers

What is the outcome of bicuspidization?

The molar furcation area is opened for easier maintenance and cleaning (D) Signup and view all the answers

What is the restoration of choice after hemisection?

Permanent coronal restoration (B) Signup and view all the answers

What is the primary advantage of bicuspidization?

Easier maintenance and cleaning of the molar furcation area (A) Signup and view all the answers