Pdf — Orthodontics Mcqs
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21. The best time to correct a transverse maxillary deficiency (crossbite) is: A) Permanent dentition B) Mixed dentition C) Early deciduous dentition D) After growth completion
22. Interceptive orthodontics is performed during: A) Adult dentition B) Early mixed dentition C) Late permanent dentition D) Only in adults orthodontics mcqs pdf
23. The most common tooth extracted in orthodontics for relief of crowding is the: A) First premolar B) Second premolar C) First molar D) Canine
24. A serial extraction sequence typically removes: A) Canines, then premolars B) Deciduous canines, then first premolars, then deciduous first molars C) Permanent molars only D) All deciduous teeth at once Not all PDFs are created equal
25. Space regainers are used to: A) Extract teeth B) Recover space lost due to premature loss of deciduous teeth C) Close extraction spaces D) Open deep bite
1. Which theory suggests that the nasal septum is the primary growth center for the midface? A. Sutural Theory B. Functional Matrix Theory C. Nasal Septum Theory (Scott’s Theory) D. Servo-System Theory Answer: C Explanation: Scott’s Hypothesis states that the cartilage of the nasal septum acts as a pacemaker for maxillary growth. while in adults
2. According to the Functional Matrix Theory by Moss, which of the following is true? A. Bone grows independently of soft tissue. B. The growth of the face is secondary to the functional needs of the soft tissues. C. Sutures are the primary growth centers. D. Cartilage is the only determinant of growth. Answer: B Explanation: Moss theorized that bone does not grow inherently; rather, it grows in response to the functional demands of the surrounding soft tissue matrix (e.g., the eye growing the orbit).
3. The "Cephalocaudal Gradient of Growth" implies: A. The head grows before the limbs. B. The limbs grow before the head. C. All body parts grow at the same rate. D. Growth occurs from the feet upwards. Answer: A Explanation: This principle states that growth proceeds from the head (cephalo) down to the tail (caudal). At birth, the head is roughly 25% of total body height, while in adults, it is about 12%.
4. Which cephalometric landmark represents the most inferior point on the mandibular symphysis? A. Pogonion B. Gnathion C. Menton D. Gonion Answer: C Explanation: Menton is the lowest point on the symphysis of the chin. Pogonion is the most anterior point, and Gnathion is the midpoint between Pogonion and Menton.
5. Scammon’s growth curve shows which tissue type reaching adult size earliest? A. Neural tissue B. Lymphoid tissue C. General (somatic) tissue D. Genital tissue Answer: A Explanation: Neural tissue (brain, cranial vault) grows very rapidly and reaches nearly 90% of adult size by age 6. Lymphoid tissue overshoots adult size before decreasing, and Genital tissue grows rapidly only during puberty.