Orthodontics Orthodontics 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% 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950 Orthodontics Orthodontics 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 / 50 Category: Orthodontics 1) A 5-year-old child has lost all anterior primary teeth. What is the most appropriate dental appliance? No treatment needed Functional appliance Removable partial denture Space maintainer A space maintainer is used to preserve space for permanent teeth. 2 / 50 Category: Orthodontics 2) What causes mesial resorption of bone and distal deposits? Physiologic mesial migration of a tooth Orthodontic extrusion Trauma Winding of the diastema Physiologic mesial migration of a tooth can cause these bone changes. 3 / 50 Category: Orthodontics 3) A patient complains about their denture. What is the most likely cause based on the picture? Poor fit Increased vertical dimension Midline shift Broken denture Midline shift is a common issue with poorly fitting dentures. 4 / 50 Category: Orthodontics 4) An 11-year-old patient needs expansion. What is the recommended activation rate? Rapid 0.5 mm daily Rapid 0.5 mm weekly Slow 0.25 mm weekly Slow 0.25 mm daily Rapid expansion at 0.5 mm daily is commonly recommended for young patients. 5 / 50 Category: Orthodontics 5) A 14-year-old patient has unerupted maxillary canines and anterior crowding. What is the best treatment? Extraction Nonextraction Distalization Expansion Expansion is often the best option for creating space in young patients. 6 / 50 Category: Orthodontics 6) A 5-year-old patient has a mandibular mesial shift. What is the best intervention? No treatment Wait until mixed dentition Habit-breaking appliance Surgery Waiting until mixed dentition is often the best approach for young patients. 7 / 50 Category: Orthodontics 7) A patient complains of a broken tube and irritating wire, with an appointment scheduled in 2 weeks. What should be done? Cut the excess wire Re-bond the tube Remove the wire Tell the patient to wait Cutting the excess wire is the most appropriate action to relieve irritation until the next appointment. 8 / 50 Category: Orthodontics 8) A patient complains of their appearance. Cephalometric analysis shows ANB = 6 and upper incisors angle to SN = 108. What is the classification? Class II division 1 Class III Class II division 2 Normal occlusion ANB = 6 and increased incisor angle indicate Class II division 1. 9 / 50 Category: Orthodontics 9) What is the Frankfort horizontal plane? Gonion to menton Porion to orbitale Nasion to ANS ANS to PNS The Frankfort horizontal plane runs from the porion to the orbitale. 10 / 50 Category: Orthodontics 10) What is the most essential X-ray for diagnosing facial asymmetry? OPG Cephalometric CT Posterior anterior CT scans provide the most detailed information for diagnosing facial asymmetry. 11 / 50 Category: Orthodontics 11) A patient has a severe Class III malocclusion with a concave profile. What is the best treatment? Orthodontic camouflage Surgical maxillary expansion No treatment Mandibular setback with maxillary advancement Mandibular setback with maxillary advancement corrects the concave profile. 12 / 50 Category: Orthodontics 12) A 22-year-old patient has a reverse anterior crossbite of 9 mm. What is the best treatment? Extraction Orthognathic surgery No treatment Orthodontic camouflage Orthognathic surgery is needed for severe reverse crossbite. 13 / 50 Category: Orthodontics 13) What type of primary occlusion ends with Class III? Distal step Mesial step Open bite Flush Mesial step occlusion is associated with Class III malocclusion. 14 / 50 Category: Orthodontics 14) A patient has a minor tongue injury due to a palatal crib. What is the best course of action? Reassure the child Reassure the parent No treatment needed Remove the palatal crib Reassuring the child is the first step for minor injuries. 15 / 50 Category: Orthodontics 15) A patient with multiple caries, heavy calculus, and severely destructed teeth seeks orthodontic treatment. What should be done after ortho? Root canal therapy Remove caries and restorations Scaling and root planing Permanent crowns Permanent crowns are necessary to restore the severely destructed teeth after orthodontic treatment. 16 / 50 Category: Orthodontics 16) An orthodontic patient is in pain. What medication is most appropriate? Aspirin Ibuprofen Paracetamol Naproxen Paracetamol is the safest option for pain relief in orthodontic patients. 17 / 50 Category: Orthodontics 17) A patient has a long wire causing irritation, with an appointment in 2 weeks. What should be done? Wait for the appointment Bond the buccal tube Cut the wire Remove the wire Cutting the wire is the best immediate solution to relieve irritation. 18 / 50 Category: Orthodontics 18) A 14-year-old patient has crowding in the upper and lower arches and a missing upper canine. What is the best treatment option? Distalization Extraction Expansion Nonextraction Expansion is often the preferred treatment for crowding and missing teeth in young patients. 19 / 50 Category: Orthodontics 19) After space analysis, a patient has 26 mm of space but requires 25 mm. What does this indicate? Crowding Normal No treatment needed Spacing The space is sufficient, indicating a normal situation. 20 / 50 Category: Orthodontics 20) A 32-year-old patient with a prognathic mandible has 6 mm of tooth show and is concerned about aesthetics. What is the best treatment? Maxillary expansion Camouflage treatment Orthognathic surgery Mandibular expansion Orthognathic surgery is the best option for significant skeletal discrepancies. 21 / 50 Category: Orthodontics 21) A 4-year-old patient has a mandibular shift when closing the mouth. What is the best management? Use a functional appliance No treatment Wait for permanent teeth to erupt Remove interference from canines Removing interference from canines can correct the mandibular shift. 22 / 50 Category: Orthodontics 22) A patient is missing tooth #6, and teeth #7 and #5 are tilted. What is the best treatment to replace tooth #6? Upright tooth #7 and replace #6 with an implant Leave the space as it is Extract tooth #7 and place a bridge Use a removable partial denture Uprighting the tilted teeth and placing an implant is the ideal treatment to restore function and aesthetics. 23 / 50 Category: Orthodontics 23) A patient with Class II malocclusion has excessive vertical growth and incompetent lips. What is the most likely cause? Skeletal discrepancy Tooth-jaw discrepancy Genetic factors Soft tissue imbalance Skeletal discrepancy is often the cause of excessive vertical growth and incompetent lips. 24 / 50 Category: Orthodontics 24) A patient has a Class III molar relationship. What is the best camouflage extraction? Extract upper first premolar and lower first premolar Extract lower first premolar No extraction Extract upper second premolar and lower first premolar Extracting upper second premolar and lower first premolar is a common camouflage strategy for Class III malocclusion. 25 / 50 Category: Orthodontics 25) An orthodontic patient has an elongated wire causing multiple irritations. What should be done? Apply wax Wait for the next appointment Cut the wire Remove the appliance Cutting the wire is the most effective way to relieve irritation. 26 / 50 Category: Orthodontics 26) A 7-year-old patient has an anterior open bite, tongue thrusting, and occasional thumb sucking. What is the most likely cause of the open bite? Swallowing with tongue thrust Tongue forward position Genetic factors Thumb sucking Thumb sucking is a common cause of anterior open bite in children. 27 / 50 Category: Orthodontics 27) A patient has a unilateral crossbite caused by unilateral maxillary constriction. What is the best treatment? Surgery No treatment Unilateral expansion Bilateral expansion Unilateral expansion is the treatment for unilateral maxillary constriction. 28 / 50 Category: Orthodontics 28) A patient with fixed orthodontic appliances complains of pain posterior to tooth #17. What is the most likely cause? Normal adjustment pain Extended wire Infection Broken bracket An extended wire is a common cause of irritation and pain in orthodontic patients. 29 / 50 Category: Orthodontics 29) What is the definition of pseudo Class III malocclusion? A condition where the mandible shifts forward, mimicking Class III malocclusion A condition where the teeth are perfectly aligned A condition where the mandible is retruded A condition where the maxilla is underdeveloped Pseudo Class III malocclusion is characterized by a forward shift of the mandible, creating the appearance of a Class III malocclusion without true skeletal discrepancy. 30 / 50 Category: Orthodontics 30) Where is the center of rotation of a single tooth? Apex of the tooth Middle of the tooth and crown Middle of the tooth and apical Furcation The center of rotation is typically located between the middle of the tooth and the apical region. 31 / 50 Category: Orthodontics 31) A patient has normal occlusion except for one tooth that needs retraction. What is the best appliance? Facemask Hawley retainer with labial bow Quad helix Finger spring A finger spring is effective for single tooth retraction. 32 / 50 Category: Orthodontics 32) What is the most common malocclusion? Class I crowding Class II Class III Class I aligned teeth Class I crowding is the most common type of malocclusion. 33 / 50 Category: Orthodontics 33) A patient with Class II malocclusion has a parent concerned about mandibular deficiency. What measurement is most useful for diagnosis? SNB SN-MP SNA SN-OP SNB is used to assess the position of the mandible. 34 / 50 Category: Orthodontics 34) A patient complains of a deep bite and excessive vertical growth of the maxilla. What is the most likely diagnosis? Vertical excess of the maxilla Skeletal Class III Skeletal Class II Normal growth Skeletal Class II is characterized by excessive vertical growth of the maxilla. 35 / 50 Category: Orthodontics 35) A patient has pseudo Class III malocclusion with a mandibular shift to the anterior. What is the best management? Facemask No treatment Smoothing with modification of cusps Palate expansion Smoothing the cusps can help reduce the mandibular shift in pseudo Class III cases. 36 / 50 Category: Orthodontics 36) A patient has a unilateral crossbite due to a functional shift of the mandible. What is the best treatment? Bilateral maxillary expansion Treatment of unilateral crossbite on the affected side No treatment Treatment of unilateral crossbite on the non-affected side Bilateral maxillary expansion is the most effective treatment for functional shifts. 37 / 50 Category: Orthodontics 37) What does an increased ANB angle indicate? Class I Class II Normal occlusion Class III An increased ANB angle is indicative of Class II malocclusion. 38 / 50 Category: Orthodontics 38) A patient has a fixed orthodontic appliance with a diastema and low frenum. What is the next step? Continue orthodontic treatment Frenectomy Wait for natural closure Remove the appliance Frenectomy is often necessary to address a low frenum causing diastema. 39 / 50 Category: Orthodontics 39) A patient has increased lower facial height, abnormal ramus growth, open bite, and proclined incisors. What is the most likely cause? Genetic factors Tongue thrust habit Mouth breathing Coronal syndrome Mouth breathing is a common cause of increased lower facial height and open bite. 40 / 50 Category: Orthodontics 40) A 25-year-old patient has a retained primary canine and an impacted permanent canine with poor prognosis. What is the best management? Crown for the primary canine No treatment Extraction and space closure Extraction of both canines and implant If the primary canine has a good prognosis, it is best to leave it in place. 41 / 50 Category: Orthodontics 41) A 5-year-old patient has a prognathic mandible, open bite, crossbite, and maxillary deficiency. What should be treated first? Mandibular prognathism Maxillary deficiency Open bite Crossbite Maxillary deficiency should be addressed first to correct the skeletal discrepancy. 42 / 50 Category: Orthodontics 42) What appliance is used to retract anterior teeth when space is available? Twin block Quad helix Facemask Hawley with labial bow A Hawley appliance with a labial bow is effective for retracting anterior teeth. 43 / 50 Category: Orthodontics 43) A patient has a posterior crossbite, open bite, and thumb-sucking habit. What is the best appliance? Hawley retainer Palatal crib Facemask Quad helix Quad helix is effective for correcting posterior crossbite and open bite. 44 / 50 Category: Orthodontics 44) What is the definition of Class I malocclusion? Overjet Perfectly aligned teeth Overbite Malaligned teeth Class I malocclusion involves malaligned teeth with a normal molar relationship. 45 / 50 Category: Orthodontics 45) A mother is concerned about her 10-year-old child’s missing teeth. Which tooth is most likely missing? Lower first molar Upper lateral incisor Lower lateral incisor Upper first molar Upper lateral incisors are commonly missing in children. 46 / 50 Category: Orthodontics 46) A 14-year-old patient has a Class I malocclusion with a single tooth crossbite. What is the best treatment? No treatment Fixed orthodontic appliance Removable appliance with finger spring Extraction A removable appliance with a finger spring is effective for correcting single tooth crossbite. 47 / 50 Category: Orthodontics 47) How often should a rapid expansion and Quad helix appliance be activated? Twice weekly Once daily Once monthly Once weekly Rapid expansion appliances are typically activated once daily. 48 / 50 Category: Orthodontics 48) A 15-year-old patient has Class III malocclusion with a reverse overjet of 10 mm. When should treatment begin? In 3 years In 6 years No treatment needed Immediately Immediate treatment is recommended for significant reverse overjet. 49 / 50 Category: Orthodontics 49) A patient has an overjet, inverted lower lip, and deep labiomental fold. Cephalometric analysis shows normal SNA and decreased SNB. What is the diagnosis? Normal occlusion Lower deficiency Lower deficiency and upper prognathism Microdontia The patient has lower deficiency and upper prognathism. 50 / 50 Category: Orthodontics 50) A patient complains of diffuse redness and pain in the left buccal mucosa 6 weeks after orthodontic installation. What is the most likely cause? Infection Extended wire Wire trauma Allergy to NiTi wire Allergy to NiTi wire can cause mucosal irritation and redness. Your score is The average score is 64% Facebook Twitter 0% Restart quiz Please rate this exam and leave a comment with any notes or suggestions. 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