Cephalometrics is useful in:
USES OF CEPHALOGRAMS
Cephalometrics has established itself as one of the pillars of comprehensive orthodontic diagnosis. It is also a valuable tool in treatment planning and follow up of patients undergoing orthodontic treatment.
The following are some of the applications of cephalometrics in orthodontics,

Cephalometrics helps in orthodontic diagnosis by enabling the study of skeletal, dental and soft tissue structures of the cranio-facial region.
It helps in classification of the skeletal and dental abnormalities and also helps in establishing facial type.
Cephalometrics helps in planning treatment for an individual.
It helps in evaluation of the treatment results by quantifying the changes brought about by treatment.
Cephalometrics helps in predicting the growth related changes and changes associated with surgical treatment.
Cephalometrics is a valuable aid in research work involving the cranio-dento facial region.

Ref: Bhalaji orthodontics 5th ed page no 190
Treatment of malocclusion
Diagnosis and case study
Diagnosis and treatment plan
All of the above