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Space Analysis & Extractions

Orthodontics • NEET MDS Study Guide • AI-Generated Notes

⭐ High-Yield Facts for Exam

  • Carey's = permanent dentition discrepancy.
  • Moyers = mixed dentition probability tables.
  • Bolton = tooth-size ratio.
  • All four first premolars = most common extraction.
  • Serial extraction = interceptive for severe crowding.

Space Analysis & Extractions

Analyses

  • Carey's analysis — arch length/tooth material discrepancy in the permanent dentition (and late mixed).
  • Moyers mixed dentition analysis — uses probability tables to predict unerupted canine/premolar widths from lower incisors.
  • Bolton analysis — tooth-size ratio between maxillary and mandibular arches (overall and anterior ratios).

Extractions

The most common therapeutic extraction pattern is all four first premolars in severe crowding/protrusion. Serial extraction is an interceptive procedure for severe arch-length deficiency (sequence often: deciduous canines → first deciduous molars → first premolars).

Exam Tips ⭐

Moyers = probability tables (mixed dentition); Bolton = tooth-size discrepancy; first premolar extraction = most common.

📝 Practice MCQs — Space Analysis & Extractions

Q1. Which analysis uses probability tables in the mixed dentition?
A. Bolton
B. Carey's
C. Moyers
D. Pont's
Show Answer
✅ Answer: C
Moyers analysis predicts unerupted tooth widths via probability charts.
Q2. Bolton analysis assesses:
A. Arch perimeter
B. Inter-arch tooth-size discrepancy
C. Skeletal pattern
D. Growth
Show Answer
✅ Answer: B
Bolton evaluates maxillary–mandibular tooth-size ratios.
Q3. The most common extraction pattern in orthodontics is:
A. All first molars
B. All four first premolars
C. All canines
D. Second molars
Show Answer
✅ Answer: B
First premolar extractions are most common for crowding/protrusion.
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