A. A fixed functional appliance. B. A removable functional appliance. C. An orthopedic headgear. D. A passive space maintainer. Answer: B Explanation: The Twin Block is a popular removable functional appliance consisting of separate upper and lower blocks that guide the mandible forward when the patient bites down. Varam Telugu Movie Ringtones Download Install [SAFE]
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%. Sneakysex 19 08 10 Lena Paul My Best Friends Dad
A. Direct resorption happens on the tension side. B. The applied force is too light. C. The applied force cuts off blood supply to the PDL, causing hyalinization, and bone is resorbed from the marrow side. D. The tooth moves too quickly. Answer: C Explanation: When excessive force is applied, the PDL is compressed to the point of occluding blood vessels (hyalinization). Since bone cells cannot survive, osteoclasts must attack the bone from the underside (marrow side), delaying tooth movement.
A. Molar relationship: The mesiobuccal cusp of the upper first molar occludes with the buccal groove of the lower first molar. B. Correct crown angulation and inclination. C. Absence of rotations and spaces. D. The dental midline can be slightly off-center. Answer: D Explanation: One of the six keys to normal occlusion (Andrews) is that the dental midlines should be aligned. A deviation indicates a malocclusion.
A. Peer Assessment Rating (PAR) Index B. Index of Orthodontic Treatment Need (IOTN) C. Bolton Analysis D. Pont’s Index Answer: B Explanation: IOTN is widely used in public health to prioritize treatment need. PAR is used to measure treatment outcome success. Bolton is for tooth size discrepancy.
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. Part 2: Diagnosis and Classification 6. In Angle’s Classification, a Class II Division 2 malocclusion is characterized by: A. Proclined upper incisors and increased overjet. B. Retroclined upper central incisors and decreased overjet. C. Normal incisor relationship with a distal molar relationship. D. Prognathic mandible. Answer: B Explanation: Class II Div 2 is defined by the lower molar being distal to the upper molar, specifically with retroclined (backward tilting) upper central incisors, often resulting in a deep bite and minimal overjet.
A. Teeth B. Bone (cortical plate) C. Muscles D. Soft tissue Answer: B Explanation: Cortical bone provides higher resistance to tooth movement than cancellous bone or teeth. This is the principle behind "cortical anchorage" used in temporary anchorage devices (TADs).
A. To expand the maxillary arch. B. To distalize molars. C. To maintain arch length and prevent mesial drift of molars. D. To correct crossbite. Answer: C Explanation: A Nance button is a passive appliance used in the mixed dentition to hold the position of the molars (anchorage) and prevent space loss after premature loss of deciduous molars.