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) For a 35 rotary file with 0.04 taper, calculate D9. 0.71mm 0.66mm 0.35mm 0.40mm D9 = (0.04 × 9) + (35/100) = 0.71 mm. 2 / 64 Category: Endodontics 2) A patient experienced pain and swelling after irrigation with 5.5% NaOCl. What caused this? Allergic reaction Bacterial infection NaOCl extrusion Mechanical irritation NaOCl extrusion beyond the apex causes severe pain and swelling. 3 / 64 Category: Endodontics 3) 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. 4 / 64 Category: Endodontics 4) Which tooth most commonly shows 8 root configurations? Maxillary first molar Mandibular second premolar Mandibular first molar Maxillary second premolar The maxillary second premolar (upper 5) can have 8 root configurations. 5 / 64 Category: Endodontics 5) A curved root canal in an upper molar is shown. What mishap is likely to happen? Ledge formation File separation Overfilling Perforation at the bifurcation Curved canals are prone to ledge formation. 6 / 64 Category: Endodontics 6) What instruments are used to remove GP? K-files and reamers H-files and Gates Glidden Ultrasonic tips Rotary files H-files and Gates Glidden are the standard tools. 7 / 64 Category: Endodontics 7) What is the main component of GP? Gutta-percha Zinc oxide Resin Calcium hydroxide Zinc oxide is the primary component of GP. 8 / 64 Category: Endodontics 8) A child has a crown fracture with small pulp exposure and normal apical bone 3 hours after trauma. What is the treatment? Pulpotomy RCT Apexification Vital pulp therapy Vital pulp therapy is indicated for small exposures in young teeth. 9 / 64 Category: Endodontics 9) What is the fixation time for intrusion? 2 weeks 6 weeks 8 weeks 4 weeks The recommended fixation time is 4 weeks. 10 / 64 Category: Endodontics 10) Which instrument has a negative rake angle? K-file Rotary file Reamer H-file K-files have a negative rake angle, which makes them less aggressive. 11 / 64 Category: Endodontics 11) What is the splinting time for lateral luxation? 2 weeks 8 weeks 4 weeks 6 weeks The standard splinting time is 4 weeks. 12 / 64 Category: Endodontics 12) For a K-file size 30 with a taper of 0.04, what is its diameter at D9? 0.30mm 0.50mm 0.90mm 0.66mm D0 (tip diameter) = 30/100 = 0.3 mm; D9 = (0.04 × 9) + 0.3 = 0.66 mm. 13 / 64 Category: Endodontics 13) What is the prognosis for vertical root fracture (VRF) in a single tooth? Good Questionable Hopeless Poor VRF typically has a hopeless prognosis. 14 / 64 Category: Endodontics 14) 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 0.50 taper ISO 0.60 taper The master cone determines the GP size, which is 0.50 taper. 15 / 64 Category: Endodontics 15) A patient has a traumatized anterior tooth with enamel, dentin, and pulp affected. What is this case? Luxation Uncomplicated crown fracture Complicated crown fracture Root fracture Pulp exposure makes it a complicated crown fracture. 16 / 64 Category: Endodontics 16) Why is NaOCl better than CHX for irrigation? It is less toxic It dissolves organic tissue It has longer residual effect It is cheaper NaOCl dissolves organic tissue, enhancing cleaning. 17 / 64 Category: Endodontics 17) A child has an avulsed primary tooth stored in milk and arrives immediately. What is the management? Reimplant without consent Wait for parents Contraindicated to reimplant Splint the tooth Reimplantation is contraindicated for primary teeth. 18 / 64 Category: Endodontics 18) What is the shape of the access opening for a central incisor? Triangular or trapezoid Rectangular Oval Round The access opening for central incisors is typically triangular or trapezoid. 19 / 64 Category: Endodontics 19) A patient has a traumatized anterior tooth with enamel and dentin affected, but the pulp is vital. What is this case? Root fracture Concussion Uncomplicated crown fracture Complicated crown fracture No pulp exposure makes it an uncomplicated crown fracture. 20 / 64 Category: Endodontics 20) What is the management for a mid-root fracture? Splint for 4 weeks Extract the coronal segment No treatment needed RCT Splinting for 4 weeks is the standard treatment. 21 / 64 Category: Endodontics 21) 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? Remove splint and perform RCT Leave splint and perform RCT on the central Extract the tooth Monitor without treatment The central tooth requires RCT, but the splint should remain. 22 / 64 Category: Endodontics 22) An X-ray shows GP beyond the apex. What is the reason? Over-condensation Ledge formation Incorrect file size No apical stop The absence of an apical stop allows GP extrusion. 23 / 64 Category: Endodontics 23) 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? Periapical abscess Root fracture Internal resorption Crown/root fracture The findings are consistent with a root fracture. 24 / 64 Category: Endodontics 24) What causes NaOCl extrusion during irrigation? Small apical size Excessive pressure All of the above Open apex All factors can contribute to NaOCl extrusion. 25 / 64 Category: Endodontics 25) 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. 26 / 64 Category: Endodontics 26) What is the most probable mishap in the upper second molar? Overfilling Ledge formation Perforation Instrument fracture Instrument fracture is common due to the complex anatomy of upper second molars. 27 / 64 Category: Endodontics 27) What is the splinting time for alveolar bone fracture? 8 weeks 3-4 weeks 6-7 weeks 1-2 weeks The recommended splinting time is 3-4 weeks. 28 / 64 Category: Endodontics 28) 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 the coronal segment Splint the two segments RCT for both segments Extract the tooth Only the coronal segment requires RCT. 29 / 64 Category: Endodontics 29) What should be done after a NaOCl accident? Leave the tooth open LA, I&D, irrigation Stop treatment and give antibiotics Reassure and continue treatment Immediate management includes LA, I&D, and irrigation. 30 / 64 Category: Endodontics 30) What is the treatment for an apical root fracture? No treatment needed Splint the tooth RCT Extract the apical third Splinting is the standard treatment for apical root fractures. 31 / 64 Category: Endodontics 31) Which trauma is associated with a “high metallic sound”? Concussion Avulsion Subluxation Intrusion Intrusion produces a high metallic sound upon percussion. 32 / 64 Category: Endodontics 32) What is the primary use of root canal sealer? Increase strength of filling Disinfect the canal Fill the voids Irrigate the canal Sealers are used to fill voids between the GP and canal walls. 33 / 64 Category: Endodontics 33) A patient came for retreatment of a short RCT filling with a periapical lesion. What is the predominant bacteria in the canal? S. mutans L. acidophilus E. faecalis P. gingivalis E. faecalis is the most common bacteria in such cases. 34 / 64 Category: Endodontics 34) An endo-treated tooth is short and needs re-RCT. What type of bacteria is likely present? Lactobacillus Streptococcus mutans Porphyromonas gingivalis Enterococcus faecalis E. faecalis is commonly found in retreated canals. 35 / 64 Category: Endodontics 35) Where is the second canal located in a lower central incisor? Facial Distal Lingual Mesial The second canal is typically lingual. 36 / 64 Category: Endodontics 36) A patient has permanent incisors intruded 3-4 mm. What is the treatment? Orthodontic extrusion Surgical extraction Splint the teeth RCT Orthodontic extrusion is the preferred treatment. 37 / 64 Category: Endodontics 37) What is the tip diameter for file #20? 0.30mm 0.02mm 20mm 0.20mm The tip diameter for file #20 is 0.20 mm (size/100). 38 / 64 Category: Endodontics 38) A patient came with a separated instrument. The doctor used ultrasonic to loosen the file. What is the next step? Perform apicoectomy Remove the separated instrument Obturate the canal Leave the file in place After loosening, the next step is to remove the separated instrument. 39 / 64 Category: Endodontics 39) A broken instrument is in the middle of the root. A bypass was made, and obturation was performed. What is the prognosis? Good Questionable Hopeless Poor With successful bypass and obturation, the prognosis is good. 40 / 64 Category: Endodontics 40) A file fractured after finishing preparation with a large size. What is the prognosis? Questionable Poor Good Hopeless Good progrnosis 41 / 64 Category: Endodontics 41) What is the splinting time for a horizontal root fracture between the apical and middle third? 4 weeks 8 weeks 2 weeks 6 weeks The recommended splinting time is 4 weeks. 42 / 64 Category: Endodontics 42) An endo case shows GP beyond the apex. What is the reason? GP pushed during condensation No apical stop (like MAC) Incorrect WL measurement Over-instrumentation Lack of an apical stop allows GP to extrude beyond the apex. 43 / 64 Category: Endodontics 43) What is the appropriate way to remove GP? Use heat Use ultrasonic vibration Use H-files and Gates Glidden Use rotary files H-files and Gates Glidden are effective for GP removal. 44 / 64 Category: Endodontics 44) What is the most common cause of ledge formation? File size Instrumentation technique Irrigant choice Canal curvature Improper instrumentation technique is the primary cause of ledges. 45 / 64 Category: Endodontics 45) What is most effective during RCT? Saline Sodium hypochlorite Hydrogen peroxide EDTA NaOCl is the gold standard for disinfection. 46 / 64 Category: Endodontics 46) A patient has a crown fracture at the gingival margin with large pulp exposure 2 days after trauma. What is the treatment? Pulpotomy Apexification RCT Direct pulp capping RCT is needed for large exposures in mature teeth. 47 / 64 Category: Endodontics 47) What is the definition of concussion? Pulp necrosis Tooth displacement Injury to the tooth and ligament without displacement or mobility Fracture of the root Concussion involves injury without displacement or mobility. 48 / 64 Category: Endodontics 48) A child has a traumatized anterior tooth that appears longer. What is the diagnosis? Fracture Extrusion Avulsion Intrusion The tooth appears longer due to extrusion. 49 / 64 Category: Endodontics 49) What is the splinting time for dentoalveolar fracture? 8 weeks 2 weeks 4 weeks 6 weeks The standard splinting time is 4 weeks. 50 / 64 Category: Endodontics 50) A file separated in the apical third, and attempts to bypass it failed. What should be done? Leave the tooth open Extract the tooth Obturate to the length of the instrument Perform surgical treatment Obturate to the length of the instrument if bypassing fails. 51 / 64 Category: Endodontics 51) 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. 52 / 64 Category: Endodontics 52) What is the diameter of Gates Glidden #2? 0.7mm 0.9mm 1.0mm 0.5mm Gates Glidden #2 has a diameter of 0.7 mm. 53 / 64 Category: Endodontics 53) What is the access cavity shape for an upper first premolar with 3 canals? Round Triangular Rectangular Oval With 3 canals, the access cavity becomes triangular. 54 / 64 Category: Endodontics 54) An upper central incisor was avulsed 2 days ago and kept in a dry plastic bag. What should be done? Splint adjacent teeth Clean and reimplant Do not reimplant; replace with a prosthesis Reimplant without cleaning Reimplantation is contraindicated after 2 hours in dry conditions. 55 / 64 Category: Endodontics 55) What is the length of the working part of ISO files? 25mm 16mm 20mm 18mm The standard working length of ISO files is 16 mm. 56 / 64 Category: Endodontics 56) A 14-year-old patient has tooth 21 intruded 5 mm. How to treat? Orthodontic extrusion Surgical extrusion Splint the tooth RCT Orthodontic extrusion is preferred for intruded teeth. 57 / 64 Category: Endodontics 57) 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. 58 / 64 Category: Endodontics 58) What is the access cavity shape for an upper first premolar? Round Rectangular Triangular Oval Most maxillary premolars have an oval access cavity. 59 / 64 Category: Endodontics 59) A 12-year-old patient has tooth 11 shorter than 21 after trauma. What is the diagnosis? Avulsion Intrusion Extrusion Lateral luxation The tooth appears shorter due to intrusion. 60 / 64 Category: Endodontics 60) Which irrigation material has the best antibacterial properties? Saline EDTA Chlorhexidine Sodium hypochlorite NaOCl is the most effective antibacterial irrigant. 61 / 64 Category: Endodontics 61) A 7-year-old child had trauma a year ago. What improvement would you expect? Tooth eruption Growth of root Lack of radiolucency Lack of pain In young patients, root growth is a positive sign. 62 / 64 Category: Endodontics 62) How to manage a ledge? Force a larger file Use ultrasonic vibration Use a small pre-curved manual file Perform apicoectomy A small pre-curved file is the best way to manage a ledge. 63 / 64 Category: Endodontics 63) What type of bacteria are found in a necrotic tooth? Facultative Aerobic Microaerophilic Anaerobic Necrotic teeth are predominantly infected with anaerobic bacteria. 64 / 64 Category: Endodontics 64) Enamel and dentin are affected without pulp involvement. What Ellis type is this? Type 2 Type 4 Type 3 Type 1 Ellis Type 2 involves enamel and dentin without pulp exposure. Your score is The average score is 36% 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
