MDS PREP

Which of the following is untrue of true class III malocclusion
1) Concave profile
2) Increased gonian angle
3) Protrusion of lower anterior teeth
4) Forward path of closure

Orthodontics Answer: 3

Calcification of first permanent molars starts at
1) 1.5 weels IU life
2) At birth
3) 6 months after birth
4) 2.5 years after birth

Orthodontics Answer: 2

A ten-year-old patient has lower canines trying to erupt into a space insufficient by 2 mm. Primary second molars are large and firmly in space. First premolars are erupting. An acceptable preventive orthodontic procedure in this case
1) Extraction of primary second molars
2) Extraction of first premolar
3) Disking of primary second molars
4) An active space regainer

Orthodontics Answer: 3

If a flush terminal plane (FTP) is present in the deciduoud dentition then the molars will erupt
1) Initially in class I occlusion
2) Initially in class II occlusion
3) Initially in class III occlusion
4) Initially end to end relationship

Orthodontics Answer: 4

Incompetent lips may be seen in
1) Increased anterior face height
2) Flaccid lips
3) Enlarged adenoids
4) Matured swallow

Orthodontics Answer: 1

Extraction of all permanent first molars is called
1) Balancing extractions
2) Serial extractions
3) Wilkinson"s extractions
4) Compensated extractions

Orthodontics Answer: 3

The high pull headgear is used to
1) Extrude the maxillary incisors and correct anterior deep bite
2) To intrude the maxillary incisors and correct anterior deep bite
3) To intrude the mandibular incisors and correct anterior deep bite
4) None of the above

Orthodontics Answer: 2

During retraction of anteriors into extraction space, lateral incisors are prevented from retraction. This may
1) Cause canine to move slowly
2) No effect on canine retraction
3) Lead to collapse of the arch
4) Lead to loss of anchorage

MDS PREP

Which of the following is untrue of true class III malocclusion
1) Concave profile
2) Increased gonian angle
3) Protrusion of lower anterior teeth
4) Forward path of closure

Calcification of first permanent molars starts at
1) 1.5 weels IU life
2) At birth
3) 6 months after birth
4) 2.5 years after birth

If a flush terminal plane (FTP) is present in the deciduoud dentition then the molars will erupt
1) Initially in class I occlusion
2) Initially in class II occlusion
3) Initially in class III occlusion
4) Initially end to end relationship

Incompetent lips may be seen in
1) Increased anterior face height
2) Flaccid lips
3) Enlarged adenoids
4) Matured swallow

Extraction of all permanent first molars is called
1) Balancing extractions
2) Serial extractions
3) Wilkinson"s extractions
4) Compensated extractions

The high pull headgear is used to
1) Extrude the maxillary incisors and correct anterior deep bite
2) To intrude the maxillary incisors and correct anterior deep bite
3) To intrude the mandibular incisors and correct anterior deep bite
4) None of the above

During retraction of anteriors into extraction space, lateral incisors are prevented from retraction. This may
1) Cause canine to move slowly
2) No effect on canine retraction
3) Lead to collapse of the arch
4) Lead to loss of anchorage

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MDS PREP

Which of the following is untrue of true class III malocclusion1) Concave profile2) Increased gonian angle3) Protrusion of lower anterior teeth4) Forward path of closure

Calcification of first permanent molars starts at1) 1.5 weels IU life2) At birth3) 6 months after birth4) 2.5 years after birth

If a flush terminal plane (FTP) is present in the deciduoud dentition then the molars will erupt 1) Initially in class I occlusion2) Initially in class II occlusion3) Initially in class III occlusion4) Initially end to end relationship

Incompetent lips may be seen in1) Increased anterior face height2) Flaccid lips3) Enlarged adenoids4) Matured swallow

Extraction of all permanent first molars is called1) Balancing extractions2) Serial extractions3) Wilkinson"s extractions4) Compensated extractions

The high pull headgear is used to1) Extrude the maxillary incisors and correct anterior deep bite2) To intrude the maxillary incisors and correct anterior deep bite3) To intrude the mandibular incisors and correct anterior deep bite4) None of the above

During retraction of anteriors into extraction space, lateral incisors are prevented from retraction. This may1) Cause canine to move slowly2) No effect on canine retraction3) Lead to collapse of the arch4) Lead to loss of anchorage

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Which of the following is untrue of true class III malocclusion
1) Concave profile
2) Increased gonian angle
3) Protrusion of lower anterior teeth
4) Forward path of closure

Calcification of first permanent molars starts at
1) 1.5 weels IU life
2) At birth
3) 6 months after birth
4) 2.5 years after birth

If a flush terminal plane (FTP) is present in the deciduoud dentition then the molars will erupt
1) Initially in class I occlusion
2) Initially in class II occlusion
3) Initially in class III occlusion
4) Initially end to end relationship

Incompetent lips may be seen in
1) Increased anterior face height
2) Flaccid lips
3) Enlarged adenoids
4) Matured swallow

Extraction of all permanent first molars is called
1) Balancing extractions
2) Serial extractions
3) Wilkinson"s extractions
4) Compensated extractions

The high pull headgear is used to
1) Extrude the maxillary incisors and correct anterior deep bite
2) To intrude the maxillary incisors and correct anterior deep bite
3) To intrude the mandibular incisors and correct anterior deep bite
4) None of the above

During retraction of anteriors into extraction space, lateral incisors are prevented from retraction. This may
1) Cause canine to move slowly
2) No effect on canine retraction
3) Lead to collapse of the arch
4) Lead to loss of anchorage