Prediction of lower permanent canine and premolars width by correlation methods

Area of Science:

• Dentistry
• Orthodontics
• Radiology

Background:

• Accurate prediction of unerupted tooth dimensions is crucial for effective orthodontic treatment planning.
• Estimating the size of unerupted lower permanent canines and premolars can aid in diagnosing crowding and planning space management.

Purpose of the Study:

• To establish linear regression equations for estimating the widths of unerupted lower permanent canines and premolars.
• To utilize measurements from 45 degrees oblique teleradiographs for this estimation.

Main Methods:

• The study involved 30 white Caucasian patients undergoing orthodontic treatment.
• Measurements were taken from 45 degrees oblique teleradiographs (mixed dentition) and dental casts (permanent dentition).
• Pearson's correlation test was used to analyze the relationship between radiographic and actual tooth widths.

Main Results:

• The strongest correlation was observed between radiographic and actual widths of the first premolars (r=.82 for one side, r=.84 for both sides).
• A single linear regression equation was derived to estimate the widths of unerupted lower canines and premolars based on the first premolar measurement.

Conclusions:

• Linear regression equations derived from 45 degrees oblique teleradiographs can reliably estimate unerupted lower canine and premolar widths.
• A single measurement of the first premolar provides a basis for estimating the widths of adjacent unerupted teeth, simplifying treatment planning.