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Past Orthodontic MCQ
1. Which of the following model analysis would be useful in planning extractions for a 14 year old boy with severe class II division 1 malocclusion?
- Ashley howe analysis
- Ponts analysis
- Peck & peck analysis
- Bolton’s analysis
ANSWER a
- Howe's analysis was proposed by Ashley Howe (1947) which is based on the relationship of the tooth position with its apical base.
- Howe believed that the crowding of the teeth is usually due to a lack of width at the apical base rather than the arch length.
- He found the relationship between the twelve teeth anterior to the permanent second molars and the width of the dental arch in first premolar region.
- This is usually done in the upper arch.
2. Adams clasp is formed from which gauge of stainless steel wire
- 23 mil
- 22 mil
- 24 mil
- 28 mil
ANSWER d
- The Adams clasp is so named because it was invented by English orthodontist C. Philip Adams.
- It was originally referred to as the modified arrowhead clasp and has been called the Liverpool clasp because it was developed at the Liverpool Dental School where Adams lectured.
- The clasp functions by engaging the mesiobuccal and distobuccal undercuts of a tooth, typically the maxillary first molar.
- Adams clasp is usually formed in 21 gauge (0.7 mm; 28 mil).
- It may be formed in 22 gauge when it is to be used on canines or deciduous molars.
3. A patient with maxillary midline diastema which has been closed orthodontically requires what kind of retention
- Fixed palatal retainer
- Begs palatal for 6 months
- Begs retainer for 1 year
- No retention
ANSWER a
- Orthodontic retention is defined as maintaining teeth in optimal aesthetic and functional position after treatment.
- A fixed lingual retainer or bonded palatal retainer is usually made of a braided stainless steel wire.
- It is connected to the tongue or palatal side of the teeth with a dental composite resin.
- A fixed lingual retainer is used to hold the teeth connected to it in position and prevent relapse, or undesirable movement of the front teeth.
- Some of the indications are
- cases in which median diastema is closed,
- cases with diastemas between the anterior teeth,
- adult patient with a potential for migration of the teeth after orthodontic treatment,
- cases with tooth loss or large diastemas in the maxilla before treatment,
- cases treated with mandibular incisor extraction,
- cases with severely rotated teeth before treatment,
- cases in which the position of a palatinally impacted canine is corrected
4. Skeletal classification of malocclusion was first given by
- Salzman
- Angle
- Kratz
- Moyers
ANSWER a
- Skeletal classification byskeletal classification by salzmann in 1950
5. Interincisal angle in increased is
- Class I malocclusion with bimaxillary protrusion
- Class II division 1 malocclusion
- Class II division 2 malocclusion
- Class I malocclusion
ANSWER c
The classical features of Angle's Class II div 2 group of malocclusion were as follows:
- Orthognathic maxilla and a mild retrognathic mandible
- Marked horizontal growth pattern with forwardly rotated mandibular base
- Skeletal deep bite
- Increased interincisal angle
- Retroclined upper incisors with near-normal lower anteriors
- Lower lip placed slightly behind E-line with prominent chin
- Increased transverse maxillary values (intercanine and intermolar widths; basal arch width at canines and molars)
- Restricted mandibular arch width, hence, increased chances for crowding in lower arch.
