STUDY MODELBASING AND
SUSNA SARAH PAUL
DEPT. OF ORTHODONTICS
TRIMMING OF MAXILLARY CAST
TRIMMING OF MANDIBULAR CAST
Orthodontic diagnosis deals with recognition of
the various characteristics of the malocclusion.
Diagnostic aids fall into two categories
-Essential Diagnostic Records
-Supplemental Diagnostic Records
According to Proffit, these records fall
into three categories:
I. Teeth and oral structures
II.Evaluation of facial proportion
Orthodontic study models are
essential diagnostic records,
which are accurate plaster
reproductions of the teeth
and their supporting soft
tissues and which help to
study the occlusion and
dentition from all the three
Purpose of Making Study Models
1) Valuable in planning treatment as threedimensional records of patients dentition.
2) Occlusion can be visualized from all
3) Provide a permanent record at the start of
4)nature and severity of the malocclusion.
5)explain the treatment plan and progress..
Steps in construction of study
2.Taking a wax bite.
3.Disinfection of the impression.
4.Casting the impression.
5.Basing and trimming.
6.Finishing and polishing.
7.Care of the study models.
Models accurately reproduce the teeth and their
surrounding soft tissues.
Models are to be trimmed so that they are
symmetrical and pleasing to the eye.
Models are to be trimmed so that they meet the
measurements and angles as proposed for trimming
Models are to have a clean, smooth, bubble free
surfaces with sharp angles where the cuts meet.