Normal overbite (n) overlapping of anterior teeth is 1) 1/3 % of crowns of lower central incisor 2) 1/2 % of crowns of lower central incisor 3) 3/4 % of crowns of lower central incisor 4) None of the above
OrthodonticsAnswer: 1
Mandibular expansion appliance acts by 1) Arch expansion by tipping of teeth 2) Arch expansion by midsymphyseal suture 3) Arch expansion by increasing width of mandible 4) All of the above
OrthodonticsAnswer: 1
Serial extraction is contraindicated in all of the following except 1) Canine impaction 2) Missing premolars 3) Class II div I malocclusion 4) Crowding of deciduous dentition
OrthodonticsAnswer: 4
If the force applied is through tooth centre of resistance, then root will 1) Tip 2) Translate or move bodily 3) Intrude 4) Extrude
OrthodonticsAnswer: 2
In Angle"s classification for malocclusion, key tooth is 1) MB cusp of permanent Max. Ist molar 2) DB cusp of permanent Max. Ist molar 3) MB cusp of permanent Max. 2nd molar 4) MB cusp of permanent Mand. Ist molar
OrthodonticsAnswer: 1
A child has an extreme open bite. Only the most posterior teeth contact in the opposite arch. The best procedure for dentist would be 1) Refer the child to an orthodontist for treatment 2) Remove the posterior teeth in each quardant 3) Both of the above 4) None of the above
OrthodonticsAnswer: 1
The ratio of skeletal: dental expansion obtained finally after rapid palatal expansion is 1) 4:1 2) 3:1 3) 2:1 4) 1:1
OrthodonticsAnswer: 4
The use of lip bumper to gain space is an example of 1) Reciprocal anchorage 2) Muscular anchorage 3) Simple anchorage 4) Extraoral anchorage
