Surgical Endodontics

Best primary indication for endodontic microsurgery (EMS) instead of nonsurgical retreatment on a previously treated molar with persistent apical radiolucency and a well-seated post that cannot be removed safely?

During root-end resection, what length should typically be removed to eliminate most apical ramifications and lateral canals?

Preferred bevel angle for modern EMS root-end resection to minimize exposed dentinal tubules and preserve length?

Ideal depth of ultrasonic root-end cavity preparation?

Most suitable retrograde filling material for modern EMS due to sealing ability and biocompatibility?

Primary purpose of methylene blue dye during microsurgery?

Best flap design to minimize marginal recession around anterior esthetic crowns during apical surgery when attached gingiva is ample?

When is a papilla preservation flap most appropriate?

Most predictable intraoperative hemostatic protocol for small cancellous bleeds during EMS?

Which anatomic structure is at greatest risk with vertical releasing incisions in the mandibular premolar region?

In maxillary first molar apical surgery, which root apex is most often adjacent to the sinus floor?

Optimal osteotomy size principle in EMS?

Best way to inspect the root-end after resection under DOM?

What is the primary goal of root-end filling in EMS?

Which scenario favors guided endodontic surgery (static guide)?

Most appropriate suture material and size for delicate papillary closure in EMS?

Typical timeline for suture removal after uncomplicated EMS?

Primary radiographic follow-up interval to assess initial healing after EMS?

Which defect is a good candidate for regenerative (graft/membrane) approach during EMS?

Most common reason for failure after apical surgery on a treated molar?

Best management for small maxillary sinus perforation during osteotomy?

During EMS, the resected root surface shows a complete isthmus between two canals. Best action?

Contraindication for intentional replantation?

Key principle for intentional replantation to reduce ankylosis risk?

When managing a true apical root fracture noted intraoperatively, which is most appropriate?

The primary purpose of crypt management (e.g., collagen, calcium sulfate) during EMS?

Most appropriate preoperative imaging to plan EMS near the mandibular canal?

Which statement about semilunar (curvilinear) incisions is correct?

For hemostasis in the bony crypt, which topical is commonly used?

Why is a minimal osteotomy advantageous in EMS?

The most reliable sign of successful healing after EMS at recall?

During retrograde filling placement, the field becomes wet with blood/saline. Best strategy?

Which situation favors orthograde retreatment instead of EMS?

Most appropriate management when an isthmus cannot be adequately prepared ultrasonically due to root thickness limits?

Best immediate step when profuse bleeding prevents visualization despite standard measures?

Which statement about amalgam as retrograde material is most accurate today?

Primary reason to use DOM (operating microscope) in EMS?

Most appropriate postoperative instruction after maxillary EMS near the sinus?

Which intraoperative finding most strongly suggests need to modify the treatment plan toward extraction?

In a maxillary lateral incisor with apical pathology and a cast post that cannot be removed, what is the preferred surgical approach?

Which preoperative factor most strongly favors choosing EMS over orthograde retreatment?

Which root shows the highest prevalence of isthmuses requiring retroprep in mandibular molars?

Optimal root-end filling thickness for bioceramic/MTA retrofill?

Best instrument for precise retrograde cavity preparation under DOM?

Which flap minimizes papillary recession in anterior esthetic zones with narrow papillae?

Most appropriate suture removal time after uncomplicated anterior EMS?

Which hemostatic agent is preferred intraoperatively in the crypt for short-term control?

In maxillary premolar EMS, which structure demands caution during vertical releasing incisions?

Primary goal of root-end resection beveling today?

What is the recommended osteotomy diameter for modern EMS?

Which postoperative mouthrinse is commonly recommended after EMS?

Radiographic healing categories after EMS per Rud/Molven include which outcome as “scar healing”?

During maxillary molar EMS, which root typically lies farthest from the sinus floor?

For an incisive canal proximity on a maxillary lateral incisor, what imaging best refines risk?

Which intraoperative finding most predicts poor EMS prognosis?

When is bone graft/membrane most indicated during EMS?

Best immediate response to profuse bleeding obscuring the apex?

Why is amalgam obsolete as a root-end filling?

What is an advantage of piezosurgery for osteotomy?

Best management for small Schneiderian membrane perforation during maxillary EMS?

Which retrograde prep shape is ideal?

Indication for guided endodontic surgery (static guide) is strongest when:

Which suture type is preferred to minimize plaque accumulation?

Postoperative analgesia after EMS for a healthy adult commonly includes:

For mandibular premolars, which structure is at risk during vertical release?

Intraoperative methylene blue is primarily used to:

A previously treated maxillary canine with excellent coronal seal has apical lesion; post is long and bonded. Best approach?

Which sign at 12-month recall indicates likely failure?

Most common cause of EMS failure when retroprep and retrofill appear ideal?

The recommended resection length of 3 mm primarily aims to:

In mandibular molar EMS, which anatomic hazard lies lingual to roots?

When should antibiotics be prescribed post-EMS in a healthy patient?

What postoperative complication suggests sinus involvement after maxillary EMS?

Which factor improves microsurgical success the most?

Best way to handle a fenestrated buccal plate over the apex before EMS?

Which postoperative instruction is correct after EMS?

Intentional replantation success depends primarily on:

Intraoperative perforation into the maxillary sinus occurs without contamination. Best step?

For a mandibular molar with IAN proximity, which approach reduces nerve injury risk?

Which finding at surgery suggests need to change the diagnosis from persistent apical periodontitis to true cyst (less likely to heal)?

During EMS on #11 you observe a palatal fenestration and thin soft tissue; goal is esthetic preservation.

What is the most reliable intraoperative method to identify a vertical root fracture after apical resection?

Best strategy to manage a small buccal plate fenestration discovered during EMS on a maxillary lateral incisor?

In a mandibular molar EMS, the resected mesial root shows an un-instrumentable isthmus.

Which root-end filling exhibits bioactivity promoting hydroxyapatite formation at the dentin interface?

After EMS on #14, patient has transient paresthesia of the infraorbital region. Most appropriate action?

What preoperative factor most predicts challenging hemostasis during EMS?

Key advantage of ultrasonic retroprep versus micro-bur retroprep in EMS?

Which finding at 12-month recall qualifies as “healed” after EMS?

How far should root end typically be resected to remove the majority of apical ramifications and deltas?

During EMS, Schneiderian membrane is perforated and slightly contaminated with saliva.

In intentional replantation, what splinting protocol optimizes PDL healing?

Which scenario most strongly indicates guided endodontic surgery (static guide)?

Best postoperative instruction after sinus-involved EMS to limit complications?

Which crypt packing choice helps hemostasis without chemically damaging tissues?

A well-treated maxillary premolar with irretrievable post shows persistent periapical lesion; patient demands extraction for a faster fix.