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% 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657 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 / 57 Category: Endodontics 1) A file fractured after finishing preparation with a large size. What is the prognosis? Poor Good Hopeless Questionable Good progrnosis 2 / 57 Category: Endodontics 2) What is the splinting time for alveolar bone fracture? 1-2 weeks 8 weeks 6-7 weeks 3-4 weeks The recommended splinting time is 3-4 weeks. 3 / 57 Category: Endodontics 3) A child has a traumatized anterior tooth that appears longer. What is the diagnosis? Fracture Intrusion Avulsion Extrusion The tooth appears longer due to extrusion. 4 / 57 Category: Endodontics 4) What is the main component of GP? Resin Zinc oxide Calcium hydroxide Gutta-percha Zinc oxide is the primary component of GP. 5 / 57 Category: Endodontics 5) The master cone is size 50 and the flare is done for size 60. What will be the GP size? 0.55 taper 0.50 taper ISO 0.60 taper 0.50 taper The master cone determines the GP size, which is 0.50 taper. 6 / 57 Category: Endodontics 6) Which instrument has a negative rake angle? K-file Reamer H-file Rotary file K-files have a negative rake angle, which makes them less aggressive. 7 / 57 Category: Endodontics 7) What is the shape of the access opening for a central incisor? Oval Triangular or trapezoid Round Rectangular The access opening for central incisors is typically triangular or trapezoid. 8 / 57 Category: Endodontics 8) What instruments are used to remove GP? K-files and reamers Rotary files Ultrasonic tips H-files and Gates Glidden H-files and Gates Glidden are the standard tools. 9 / 57 Category: Endodontics 9) What is the tip diameter for file #20? 0.02mm 0.20mm 0.30mm 20mm The tip diameter for file #20 is 0.20 mm (size/100). 10 / 57 Category: Endodontics 10) What is most effective during RCT? Saline EDTA Hydrogen peroxide Sodium hypochlorite NaOCl is the gold standard for disinfection. 11 / 57 Category: Endodontics 11) What is the length of the working part of ISO files? 20mm 16mm 18mm 25mm The standard working length of ISO files is 16 mm. 12 / 57 Category: Endodontics 12) An X-ray shows GP beyond the apex. What is the reason? Incorrect file size No apical stop Ledge formation Over-condensation The absence of an apical stop allows GP extrusion. 13 / 57 Category: Endodontics 13) A broken instrument is in the middle of the root. A bypass was made, and obturation was performed. What is the prognosis? Hopeless Poor Questionable Good With successful bypass and obturation, the prognosis is good. 14 / 57 Category: Endodontics 14) A patient has permanent incisors intruded 3-4 mm. What is the treatment? Splint the teeth Orthodontic extrusion RCT Surgical extraction Orthodontic extrusion is the preferred treatment. 15 / 57 Category: Endodontics 15) A 7-year-old child had trauma a year ago. What improvement would you expect? Growth of root Lack of radiolucency Tooth eruption Lack of pain In young patients, root growth is a positive sign. 16 / 57 Category: Endodontics 16) What is the splinting time for lateral luxation? 6 weeks 8 weeks 2 weeks 4 weeks The standard splinting time is 4 weeks. 17 / 57 Category: Endodontics 17) Where is the second canal located in a lower central incisor? Lingual Distal Facial Mesial The second canal is typically lingual. 18 / 57 Category: Endodontics 18) What type of bacteria are found in a necrotic tooth? Aerobic Anaerobic Facultative Microaerophilic Necrotic teeth are predominantly infected with anaerobic bacteria. 19 / 57 Category: Endodontics 19) What is the primary use of root canal sealer? Disinfect the canal Fill the voids Increase strength of filling Irrigate the canal Sealers are used to fill voids between the GP and canal walls. 20 / 57 Category: Endodontics 20) What is the fixation time for intrusion? 4 weeks 8 weeks 6 weeks 2 weeks The recommended fixation time is 4 weeks. 21 / 57 Category: Endodontics 21) What is the splinting time for dentoalveolar fracture? 6 weeks 4 weeks 2 weeks 8 weeks The standard splinting time is 4 weeks. 22 / 57 Category: Endodontics 22) A patient has a traumatized anterior tooth with enamel and dentin affected, but the pulp is vital. What is this case? Complicated crown fracture Root fracture Uncomplicated crown fracture Concussion No pulp exposure makes it an uncomplicated crown fracture. 23 / 57 Category: Endodontics 23) 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? Monitor without treatment Extract the tooth Remove splint and perform RCT Leave splint and perform RCT on the central The central tooth requires RCT, but the splint should remain. 24 / 57 Category: Endodontics 24) A patient has a crown fracture at the gingival margin with large pulp exposure 2 days after trauma. What is the treatment? Apexification Pulpotomy Direct pulp capping RCT RCT is needed for large exposures in mature teeth. 25 / 57 Category: Endodontics 25) A child has a crown fracture with small pulp exposure and normal apical bone 3 hours after trauma. What is the treatment? Vital pulp therapy RCT Apexification Pulpotomy Vital pulp therapy is indicated for small exposures in young teeth. 26 / 57 Category: Endodontics 26) A 14-year-old patient has tooth 21 intruded 5 mm. How to treat? Splint the tooth Surgical extrusion RCT Orthodontic extrusion Orthodontic extrusion is preferred for intruded teeth. 27 / 57 Category: Endodontics 27) For a 35 rotary file with 0.04 taper, calculate D9. 0.71mm 0.35mm 0.66mm 0.40mm D9 = (0.04 × 9) + (35/100) = 0.71 mm. 28 / 57 Category: Endodontics 28) What should be done after a NaOCl accident? Leave the tooth open Reassure and continue treatment LA, I&D, irrigation Stop treatment and give antibiotics Immediate management includes LA, I&D, and irrigation. 29 / 57 Category: Endodontics 29) What is the splinting time for a horizontal root fracture between the apical and middle third? 6 weeks 4 weeks 8 weeks 2 weeks The recommended splinting time is 4 weeks. 30 / 57 Category: Endodontics 30) 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 Remove the separated instrument Perform apicoectomy Obturate the canal After loosening, the next step is to remove the separated instrument. 31 / 57 Category: Endodontics 31) 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? Root fracture Periapical abscess Crown/root fracture Internal resorption The findings are consistent with a root fracture. 32 / 57 Category: Endodontics 32) What is the appropriate way to remove GP? Use heat Use rotary files Use H-files and Gates Glidden Use ultrasonic vibration H-files and Gates Glidden are effective for GP removal. 33 / 57 Category: Endodontics 33) What is the access cavity shape for an upper first premolar? Rectangular Triangular Round Oval Most maxillary premolars have an oval access cavity. 34 / 57 Category: Endodontics 34) You lost your working length due to a ledge. What should you do? Irrigate with NaOCl Stop instrumentation Use a pre-curved file (size 8-10) Force a larger file A pre-curved small file can help regain working length. 35 / 57 Category: Endodontics 35) A 12-year-old patient has tooth 11 shorter than 21 after trauma. What is the diagnosis? Intrusion Lateral luxation Extrusion Avulsion The tooth appears shorter due to intrusion. 36 / 57 Category: Endodontics 36) A file separated in the apical third, and attempts to bypass it failed. What should be done? Leave the tooth open Extract the tooth Perform surgical treatment Obturate to the length of the instrument Obturate to the length of the instrument if bypassing fails. 37 / 57 Category: Endodontics 37) How to manage a ledge? Perform apicoectomy Force a larger file Use ultrasonic vibration Use a small pre-curved manual file A small pre-curved file is the best way to manage a ledge. 38 / 57 Category: Endodontics 38) Enamel and dentin are affected without pulp involvement. What Ellis type is this? Type 2 Type 3 Type 1 Type 4 Ellis Type 2 involves enamel and dentin without pulp exposure. 39 / 57 Category: Endodontics 39) Which trauma is associated with a “high metallic sound”? Intrusion Subluxation Avulsion Concussion Intrusion produces a high metallic sound upon percussion. 40 / 57 Category: Endodontics 40) What is the most common cause of ledge formation? File size Canal curvature Instrumentation technique Irrigant choice Improper instrumentation technique is the primary cause of ledges. 41 / 57 Category: Endodontics 41) During instrumentation, the master apical file did not reach the working length (ledge). What is the management? Place calcium hydroxide dressing Widen the canal using ultrasonic scaler Force a larger file Bypass with a small curved file A small curved file can help bypass the ledge. 42 / 57 Category: Endodontics 42) For a K-file size 30 with a taper of 0.04, what is its diameter at D9? 0.50mm 0.30mm 0.90mm 0.66mm D0 (tip diameter) = 30/100 = 0.3 mm; D9 = (0.04 × 9) + 0.3 = 0.66 mm. 43 / 57 Category: Endodontics 43) An upper central incisor was avulsed 2 days ago and kept in a dry plastic bag. What should be done? Splint adjacent teeth Do not reimplant; replace with a prosthesis Reimplant without cleaning Clean and reimplant Reimplantation is contraindicated after 2 hours in dry conditions. 44 / 57 Category: Endodontics 44) A file separated in the middle. What is the prognosis if the dentist was able to retrieve it? Poor Hopeless Good Questionable If the file is retrieved, the prognosis is good. 45 / 57 Category: Endodontics 45) A patient came for retreatment of a short RCT filling with a periapical lesion. What is the predominant bacteria in the canal? E. faecalis S. mutans L. acidophilus P. gingivalis E. faecalis is the most common bacteria in such cases. 46 / 57 Category: Endodontics 46) An endo-treated tooth is short and needs re-RCT. What type of bacteria is likely present? Enterococcus faecalis Streptococcus mutans Porphyromonas gingivalis Lactobacillus E. faecalis is commonly found in retreated canals. 47 / 57 Category: Endodontics 47) What is the prognosis for vertical root fracture (VRF) in a single tooth? Questionable Good Hopeless Poor VRF typically has a hopeless prognosis. 48 / 57 Category: Endodontics 48) What is the management for a mid-root fracture? No treatment needed Splint for 4 weeks Extract the coronal segment RCT Splinting for 4 weeks is the standard treatment. 49 / 57 Category: Endodontics 49) 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 RCT for the coronal segment Splint the two segments Extract the tooth Only the coronal segment requires RCT. 50 / 57 Category: Endodontics 50) What is the most probable mishap in the upper second molar? Perforation Ledge formation Overfilling Instrument fracture Instrument fracture is common due to the complex anatomy of upper second molars. 51 / 57 Category: Endodontics 51) A patient has a traumatized anterior tooth with enamel, dentin, and pulp affected. What is this case? Root fracture Complicated crown fracture Luxation Uncomplicated crown fracture Pulp exposure makes it a complicated crown fracture. 52 / 57 Category: Endodontics 52) A curved root canal in an upper molar is shown. What mishap is likely to happen? Overfilling Ledge formation Perforation at the bifurcation File separation Curved canals are prone to ledge formation. 53 / 57 Category: Endodontics 53) What is the definition of concussion? Pulp necrosis Fracture of the root Injury to the tooth and ligament without displacement or mobility Tooth displacement Concussion involves injury without displacement or mobility. 54 / 57 Category: Endodontics 54) An endo case shows GP beyond the apex. What is the reason? No apical stop (like MAC) Incorrect WL measurement Over-instrumentation GP pushed during condensation Lack of an apical stop allows GP to extrude beyond the apex. 55 / 57 Category: Endodontics 55) What is the access cavity shape for an upper first premolar with 3 canals? Rectangular Round Oval Triangular With 3 canals, the access cavity becomes triangular. 56 / 57 Category: Endodontics 56) Which irrigation material has the best antibacterial properties? Sodium hypochlorite Saline EDTA Chlorhexidine NaOCl is the most effective antibacterial irrigant. 57 / 57 Category: Endodontics 57) What causes NaOCl extrusion during irrigation? Open apex Excessive pressure Small apical size All of the above All factors can contribute to NaOCl extrusion. Your score is The average score is 57% Facebook Twitter 0% Restart quiz Please rate this exam and leave a comment with any notes or suggestions. 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