1. Not true about couple of forces acting on a tooth: Collinear forces acting in same direction Pure rotation can be achieved Forces are oriented parallel to each other Usually forces are equal in magnitude 2. Hand wrist radiograph in orthodontics are used to accurately determine: Skeletal maturity Both A and B Chronological age Dental age 3. Normal facial index is: >80% 75-80% <75% 1 4. Which is the most stable and the most often used plane for the superimposition of lateral cephalogram for studying the growth of a child? S-N plane Frankfort plane Occlusal plane Mandibular plane 5. A Child with a Unilateral crossbite on closure is most probably suffering from: Bilateral constriction of maxilla with deviated closure into unilateral crossbite Unilateral constriction of maxilla Bilateral constriction of maxilla Unilateral constriction of maxilla with deviated closure into unilateral crossbite 6. Incisal liability in the maxillary and mandibular arch is: 7 mm maxilla, 5 mm mandible 5 mm maxilla, 7 mm mandible 6 mm maxilla, 4 mm mandible 4 mm maxilla, 6 mm mandible 7. Generalized Anterior crossbite in the primary dentition indicates: A developing Class II malocclusion A developing Class III malocclusion A normal maxillo-mandibular relation A dental malrelation 8. If moment of couple moment of force MC/MF = 0, then what type of movement occurs: Bodily Translation Tipping Torque 9. Ratio of Upper Anterior Facial Height to Lower Anterior Facial Height Is 60;40 0;60 55;45 45;55 10. Which of these is rarely seen in primary dentition: Crowding Spacing Protrusive anterior maxillary teeth End-on molar relation 11. Cephalometrics is useful for assessing all of the following relationships except: Tooth to bone Soft palate to gingiva. Tooth to tooth Bone to bone 12. The Frankfort-horizontal is a reference plane constructed by joining which of the following landmarks? Porion and orbitale. Porion and nasion. Porion and sella. Nasion and sella. 13. Safety valve mechanism for pubertal growth spurt is: Intercanine width in maxilla in males only Intercanine width in maxilla in females only Intercanine width in maxilla in both males and females Intercanine width in mandible in both males and females 14. The importance of proximal caries in deciduous 1st Molar for an orthodontist is: Loss of arch length Flush terminal plane malocclusion Class I Occlusion RedUcticin in, arch length due to growth of mandible 15. In long face individuals, who have excessive lower anterior facial height, the palatal plane is rotated Down posteriorly No rotation of the palatal plane Down anteriorly Up posteriorly 16. The cranial vault is made up of a number of flat bones that are formed by _________________ , ________ cartilaginous precursors. Endochondral bone formation; with Intramembranous bone formation; without Both endochondral and intramembranous bone formation; without Both endochondral and intramembranous bone formation; with 17. When permanent maxillary lateral incisors are congenitally missing, the permanent canine may often erupt: Mesial to the deciduous canine Between the two CIs May be congenitally missing Distal to the deciduous canine 18. A Moment: Force ratio of 7 will cause: Torqueing Controlled tipping Uncontrolled tipping Translation 19. Which of the following is correct: Genetics has equal influence on all types of jaw dysplasias Vertical jaw dysplasias are more genetically determined than other dysplasias Anteroposterior jaw dysplasias are more genetically determined than other dysplasias Transverse jaw dysplasias are more genetically determined than other dysplasias 20. How much overjet can be successfully managed using dentofacial orthopedics: 5-7 mm 10-14 mm 0-7 mm 14-18 mm Loading … Question 1 of 20
