Endodontics R11 Endodontics SDLE MCQ | Part 1 Facebook X LinkedIn Messenger Messenger WhatsApp Telegram Print Report a question What’s wrong with this question? You cannot submit an empty report. Please add some details. 0% 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364 Endodontics R11 Endodontics SDLE MCQ | Part 1 DentQuiz SDLE Mock Exam Instruction To mark a question and come back to it later, click the Bookmark icon. For the best experience, use a computer and switch to full screen button (from the top left corner). You can review and change your answers before clicking Next. Explanations will appear after each question to help you understand the correct answer. Your results will be shown right after you finish the exam. This is a fresh attempt — previous answers or bookmarks won’t be saved. The source of the questions and answers is recent Rafee’ Al-Maqam files. Special thanks to رفيع المقام. Answers are based on colleagues best efforts and may not be 100% accurate. If you believe an answer is incorrect, please click the Report button to let us know. Please fill in your details to continue NameEmailPhone Number 1 / 64 Category: Endodontics 1) A patient has a horizontal radiolucent line in the middle of the root, a yellowish tooth, and a history of trauma. Cold test shows a late response. What is the diagnosis? Crown/root fracture Periapical abscess Root fracture Internal resorption The findings are consistent with a root fracture. 2 / 64 Category: Endodontics 2) A patient has a traumatized anterior tooth with enamel and dentin affected, but the pulp is vital. What is this case? Uncomplicated crown fracture Concussion Root fracture Complicated crown fracture No pulp exposure makes it an uncomplicated crown fracture. 3 / 64 Category: Endodontics 3) What is the prognosis for vertical root fracture (VRF) in a single tooth? Poor Good Hopeless Questionable VRF typically has a hopeless prognosis. 4 / 64 Category: Endodontics 4) A child has an avulsed primary tooth stored in milk and arrives immediately. What is the management? Contraindicated to reimplant Splint the tooth Wait for parents Reimplant without consent Reimplantation is contraindicated for primary teeth. 5 / 64 Category: Endodontics 5) What is the most common cause of ledge formation? Canal curvature Instrumentation technique File size Irrigant choice Improper instrumentation technique is the primary cause of ledges. 6 / 64 Category: Endodontics 6) What should be done after a NaOCl accident? LA, I&D, irrigation Leave the tooth open Reassure and continue treatment Stop treatment and give antibiotics Immediate management includes LA, I&D, and irrigation. 7 / 64 Category: Endodontics 7) What is most effective during RCT? Saline Hydrogen peroxide EDTA Sodium hypochlorite NaOCl is the gold standard for disinfection. 8 / 64 Category: Endodontics 8) A patient experienced pain and swelling after irrigation with 5.5% NaOCl. What caused this? Bacterial infection Allergic reaction Mechanical irritation NaOCl extrusion NaOCl extrusion beyond the apex causes severe pain and swelling. 9 / 64 Category: Endodontics 9) What is the fixation time for intrusion? 2 weeks 4 weeks 8 weeks 6 weeks The recommended fixation time is 4 weeks. 10 / 64 Category: Endodontics 10) A patient has permanent incisors intruded 3-4 mm. What is the treatment? Surgical extraction RCT Splint the teeth Orthodontic extrusion Orthodontic extrusion is the preferred treatment. 11 / 64 Category: Endodontics 11) For a K-file size 30 with a taper of 0.04, what is its diameter at D9? 0.30mm 0.66mm 0.50mm 0.90mm D0 (tip diameter) = 30/100 = 0.3 mm; D9 = (0.04 × 9) + 0.3 = 0.66 mm. 12 / 64 Category: Endodontics 12) What is the treatment for an apical root fracture? Splint the tooth RCT No treatment needed Extract the apical third Splinting is the standard treatment for apical root fractures. 13 / 64 Category: Endodontics 13) What is the definition of concussion? Fracture of the root Pulp necrosis Injury to the tooth and ligament without displacement or mobility Tooth displacement Concussion involves injury without displacement or mobility. 14 / 64 Category: Endodontics 14) An upper central incisor was avulsed 2 days ago and kept in a dry plastic bag. What should be done? Do not reimplant; replace with a prosthesis Reimplant without cleaning Splint adjacent teeth Clean and reimplant Reimplantation is contraindicated after 2 hours in dry conditions. 15 / 64 Category: Endodontics 15) What is the access cavity shape for an upper first premolar with 3 canals? Oval Round Triangular Rectangular With 3 canals, the access cavity becomes triangular. 16 / 64 Category: Endodontics 16) A child has a crown fracture with small pulp exposure and normal apical bone 3 hours after trauma. What is the treatment? Pulpotomy Vital pulp therapy RCT Apexification Vital pulp therapy is indicated for small exposures in young teeth. 17 / 64 Category: Endodontics 17) What causes NaOCl extrusion during irrigation? Open apex All of the above Small apical size Excessive pressure All factors can contribute to NaOCl extrusion. 18 / 64 Category: Endodontics 18) Which irrigation material has the best antibacterial properties? Chlorhexidine Saline Sodium hypochlorite EDTA NaOCl is the most effective antibacterial irrigant. 19 / 64 Category: Endodontics 19) A patient has a crown fracture at the gingival margin with large pulp exposure 2 days after trauma. What is the treatment? Apexification Direct pulp capping RCT Pulpotomy RCT is needed for large exposures in mature teeth. 20 / 64 Category: Endodontics 20) What is the length of the working part of ISO files? 25mm 18mm 16mm 20mm The standard working length of ISO files is 16 mm. 21 / 64 Category: Endodontics 21) Which trauma is associated with a “high metallic sound”? Concussion Subluxation Avulsion Intrusion Intrusion produces a high metallic sound upon percussion. 22 / 64 Category: Endodontics 22) An endo-treated tooth is short and needs re-RCT. What type of bacteria is likely present? Porphyromonas gingivalis Streptococcus mutans Enterococcus faecalis Lactobacillus E. faecalis is commonly found in retreated canals. 23 / 64 Category: Endodontics 23) A 14-year-old patient has tooth 21 intruded 5 mm. How to treat? Surgical extrusion RCT Splint the tooth Orthodontic extrusion Orthodontic extrusion is preferred for intruded teeth. 24 / 64 Category: Endodontics 24) A patient has a traumatized anterior tooth with enamel, dentin, and pulp affected. What is this case? Uncomplicated crown fracture Luxation Root fracture Complicated crown fracture Pulp exposure makes it a complicated crown fracture. 25 / 64 Category: Endodontics 25) During instrumentation, the master apical file did not reach the working length (ledge). What is the management? Bypass with a small curved file Force a larger file Widen the canal using ultrasonic scaler Place calcium hydroxide dressing A small curved file can help bypass the ledge. 26 / 64 Category: Endodontics 26) A 12-year-old patient has tooth 11 shorter than 21 after trauma. What is the diagnosis? Intrusion Extrusion Avulsion Lateral luxation The tooth appears shorter due to intrusion. 27 / 64 Category: Endodontics 27) What is the access cavity shape for an upper first premolar? Oval Triangular Rectangular Round Most maxillary premolars have an oval access cavity. 28 / 64 Category: Endodontics 28) What is the management for a mid-root fracture? No treatment needed RCT Extract the coronal segment Splint for 4 weeks Splinting for 4 weeks is the standard treatment. 29 / 64 Category: Endodontics 29) An endo case shows GP beyond the apex. What is the reason? No apical stop (like MAC) Over-instrumentation GP pushed during condensation Incorrect WL measurement Lack of an apical stop allows GP to extrude beyond the apex. 30 / 64 Category: Endodontics 30) What is the splinting time for lateral luxation? 2 weeks 8 weeks 4 weeks 6 weeks The standard splinting time is 4 weeks. 31 / 64 Category: Endodontics 31) A patient had an avulsed central tooth replanted after 45 minutes. After one week, the lateral is vital, but the central is non-vital. What should be done? Extract the tooth Monitor without treatment Remove splint and perform RCT Leave splint and perform RCT on the central The central tooth requires RCT, but the splint should remain. 32 / 64 Category: Endodontics 32) What type of bacteria are found in a necrotic tooth? Aerobic Microaerophilic Facultative Anaerobic Necrotic teeth are predominantly infected with anaerobic bacteria. 33 / 64 Category: Endodontics 33) Enamel and dentin are affected without pulp involvement. What Ellis type is this? Type 4 Type 3 Type 1 Type 2 Ellis Type 2 involves enamel and dentin without pulp exposure. 34 / 64 Category: Endodontics 34) What is the primary use of root canal sealer? Increase strength of filling Irrigate the canal Fill the voids Disinfect the canal Sealers are used to fill voids between the GP and canal walls. 35 / 64 Category: Endodontics 35) The master cone is size 50 and the flare is done for size 60. What will be the GP size? 0.50 taper ISO 0.55 taper 0.50 taper 0.60 taper The master cone determines the GP size, which is 0.50 taper. 36 / 64 Category: Endodontics 36) For a 35 rotary file with 0.04 taper, calculate D9. 0.71mm 0.40mm 0.35mm 0.66mm D9 = (0.04 × 9) + (35/100) = 0.71 mm. 37 / 64 Category: Endodontics 37) What is the splinting time for a horizontal root fracture between the apical and middle third? 4 weeks 6 weeks 2 weeks 8 weeks The recommended splinting time is 4 weeks. 38 / 64 Category: Endodontics 38) What is the recommended isolation method for RCT on a maxillary anterior tooth in an asthmatic patient? Start with cotton rolls, then rubber dam Apply rubber dam throughout Use cotton rolls Place rubber dam, then change to cotton rolls Rubber dam is essential for isolation, even in asthmatic patients. 39 / 64 Category: Endodontics 39) A 7-year-old child had trauma a year ago. What improvement would you expect? Lack of radiolucency Lack of pain Growth of root Tooth eruption In young patients, root growth is a positive sign. 40 / 64 Category: Endodontics 40) Where is the second canal located in a lower central incisor? Mesial Facial Distal Lingual The second canal is typically lingual. 41 / 64 Category: Endodontics 41) A patient came with a separated instrument. The doctor used ultrasonic to loosen the file. What is the next step? Leave the file in place Perform apicoectomy Obturate the canal Remove the separated instrument After loosening, the next step is to remove the separated instrument. 42 / 64 Category: Endodontics 42) What is the splinting time for alveolar bone fracture? 8 weeks 3-4 weeks 1-2 weeks 6-7 weeks The recommended splinting time is 3-4 weeks. 43 / 64 Category: Endodontics 43) What is the most probable mishap in the upper second molar? Ledge formation Instrument fracture Perforation Overfilling Instrument fracture is common due to the complex anatomy of upper second molars. 44 / 64 Category: Endodontics 44) A child has a traumatized anterior tooth that appears longer. What is the diagnosis? Avulsion Extrusion Fracture Intrusion The tooth appears longer due to extrusion. 45 / 64 Category: Endodontics 45) A file separated in the apical third, and attempts to bypass it failed. What should be done? Perform surgical treatment Extract the tooth Obturate to the length of the instrument Leave the tooth open Obturate to the length of the instrument if bypassing fails. 46 / 64 Category: Endodontics 46) What is the tip diameter for file #20? 20mm 0.20mm 0.02mm 0.30mm The tip diameter for file #20 is 0.20 mm (size/100). 47 / 64 Category: Endodontics 47) Which tooth most commonly shows 8 root configurations? Maxillary second premolar Maxillary first molar Mandibular first molar Mandibular second premolar The maxillary second premolar (upper 5) can have 8 root configurations. 48 / 64 Category: Endodontics 48) A curved root canal in an upper molar is shown. What mishap is likely to happen? File separation Perforation at the bifurcation Overfilling Ledge formation Curved canals are prone to ledge formation. 49 / 64 Category: Endodontics 49) What is the main component of GP? Gutta-percha Zinc oxide Resin Calcium hydroxide Zinc oxide is the primary component of GP. 50 / 64 Category: Endodontics 50) You lost your working length due to a ledge. What should you do? Irrigate with NaOCl Force a larger file Use a pre-curved file (size 8-10) Stop instrumentation A pre-curved small file can help regain working length. 51 / 64 Category: Endodontics 51) What is the diameter of Gates Glidden #2? 1.0mm 0.5mm 0.9mm 0.7mm Gates Glidden #2 has a diameter of 0.7 mm. 52 / 64 Category: Endodontics 52) A file fractured after finishing preparation with a large size. What is the prognosis? Questionable Good Hopeless Poor Good progrnosis 53 / 64 Category: Endodontics 53) What is the splinting time for dentoalveolar fracture? 2 weeks 6 weeks 8 weeks 4 weeks The standard splinting time is 4 weeks. 54 / 64 Category: Endodontics 54) How to manage a ledge? Force a larger file Use ultrasonic vibration Perform apicoectomy Use a small pre-curved manual file A small pre-curved file is the best way to manage a ledge. 55 / 64 Category: Endodontics 55) What is the appropriate way to remove GP? Use rotary files Use heat Use ultrasonic vibration Use H-files and Gates Glidden H-files and Gates Glidden are effective for GP removal. 56 / 64 Category: Endodontics 56) A patient has a horizontal fracture between the middle and apical third with an osseous lesion. The tooth does not respond to cold. What is the treatment? RCT for both segments Extract the tooth RCT for the coronal segment Splint the two segments Only the coronal segment requires RCT. 57 / 64 Category: Endodontics 57) A patient came for retreatment of a short RCT filling with a periapical lesion. What is the predominant bacteria in the canal? P. gingivalis L. acidophilus S. mutans E. faecalis E. faecalis is the most common bacteria in such cases. 58 / 64 Category: Endodontics 58) Why is NaOCl better than CHX for irrigation? It dissolves organic tissue It is cheaper It has longer residual effect It is less toxic NaOCl dissolves organic tissue, enhancing cleaning. 59 / 64 Category: Endodontics 59) An X-ray shows GP beyond the apex. What is the reason? Over-condensation Incorrect file size Ledge formation No apical stop The absence of an apical stop allows GP extrusion. 60 / 64 Category: Endodontics 60) What is the shape of the access opening for a central incisor? Rectangular Round Oval Triangular or trapezoid The access opening for central incisors is typically triangular or trapezoid. 61 / 64 Category: Endodontics 61) Which instrument has a negative rake angle? Rotary file K-file H-file Reamer K-files have a negative rake angle, which makes them less aggressive. 62 / 64 Category: Endodontics 62) What instruments are used to remove GP? K-files and reamers Ultrasonic tips Rotary files H-files and Gates Glidden H-files and Gates Glidden are the standard tools. 63 / 64 Category: Endodontics 63) A broken instrument is in the middle of the root. A bypass was made, and obturation was performed. What is the prognosis? Poor Questionable Good Hopeless With successful bypass and obturation, the prognosis is good. 64 / 64 Category: Endodontics 64) A file separated in the middle. What is the prognosis if the dentist was able to retrieve it? Hopeless Good Poor Questionable If the file is retrieved, the prognosis is good. Your score is The average score is 56% Facebook Twitter 0% Restart quiz Please rate this exam and leave a comment with any notes or suggestions. Anonymous feedback Thank you for your feedback Send feedback Facebook X LinkedIn Messenger Messenger WhatsApp Telegram Print Share Facebook X LinkedIn Pinterest Reddit Messenger Messenger WhatsApp Telegram Share via Email Print
