Study models /certified fixed orthodontic courses by Indian dental academy


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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.

Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit ,or call

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Study models /certified fixed orthodontic courses by Indian dental academy

  1. 1. Study models INDIAN DENTAL ACADEMY Leader in continuing dental education
  2. 2. Orthodontic study models are accurate plaster reproductions of the teeth and their surrounding soft tissues. They provide three dimentional view of the dentition.
  3. 3. Requisites of study model     Should accurately reproduce the teeth and soft tissues without any distortion. Should be trimmed symmetrical on either side . Posterior surface should be trimmed ,such that when placed on their back, they should reproduce the occlusion . Should reproduce alveolar process as much as possible.
  4. 4. Parts of a study model  Anatomic portion:- It is the actual impression of dental arches and surrounding soft tissue structures.  Artistic portion:- plaster base that supports the anatomical portion.
  5. 5. Steps in construction of study models 1. 2. 3. 4. 5. Impression making. Disinfection of the impression. Casting the impression. Basing and trimming of the cast. Finishing and polishing of study models.
  6. 6. 1.Impression making       Should record hard and soft tissues completely. Should extend to limits of the sulcus. Maxillary impression should not extend to the soft palate. Patient should be asked to rinse the mouth before and after impression. Use high flange orthodontic trays and it should include last erupted molars and 3mm distal to it. Irreversible hydrocollids are widely used for impression making.(alginate)
  7. 7. 2. Impression disinfection  Impressions rinsed thoroughly in water.  Disinfection is done by soaking in a 2% gluteraldehyde(Biocide) or ethyle alcohal or isopropyle alcohol.  Impressions are again rinsed in water.
  8. 8. 3. Casting the impression  Casted using orthodontic stone.  eliminate air bubbles
  9. 9. 4. Basing and trimming of the cast      Fill the area occupied by tongue in mandibular impression with alginate. The stone is first poured in to tooth portion of the impression. Next stone is added to complete anatomical portion of impression. Remaining stone poured in to base former and the poured impression tray is turned upside down and pushed in to the stone in base former. Impression trays removed from poured stone after it is hardened.
  10. 10. Study cast analysis:- Gnathostatic model by SIMON, 1926  These plaster models are oriented to the midpalatal raphe, tuberosity plane and the occlusal plane for study cast analysis .these model analysis helps in a three dimensional assessment of the maxillary and mandibular dental arches and there occlusal relationships.  The upper surface of the maxillary study model corresponds to frankfurt horizontal plane.
  11. 11. According to ABO (1990) Frontal view of study model 13mm  Base of maxillary cast trimmed parallel to frankfort horizontal plane 13mm
  12. 12. Lateral view of study model 7.07.5cm 3.54.0cm 3.54.0cm  The posterior surface of max & mandibular cast should be trimmed to flush terminal plane.
  13. 13. Maxillary occlusal view of study model 5-6mm 25º 5mm 70º 90º 13mm 90º 5mm
  14. 14. Mandibular occlusal view of study model 5-6mm 5-6mm 13mm 65º 90º
  15. 15. 5. Finishing and polishing  Artistic portion of study model should be polished using fine grained sand paper.  Care should be taken not to round off the edges of model.  Final polishing done by placing in soap solution , than dried followed by buffing to acquire a smooth and shiny surface.
  16. 16. Study models are used for  To calculate total space analysis.  To assess and record the dental anatomy.  To assess and record the intercuspation.  To assess and record arch form.  To assess and record curves of occlusion.  To evaluate occlusion, with aid of articulator.  To measure progress during treatment.  To detect abnormalities ( distorted arch form)  To provide a record before, immediately after, and several years following treatment for the purpose of studying treatment procedures.
  17. 17. Digitalizing study models using OrthoCAD  OrthoCAD - It is a digital study model capture, assessment and storage system.  It provides a 3D record of the original malocclusion, any stages during treatment and the outcome of the treatment.
  18. 18. Digital study models       Advantages Virtual casts can be kept in digital format & hence eliminating storage problems. Immediate data transmission. Measurements on digital casts is easy, accurate & automatic. Digital images can be made bigger and hence localizing anatomic points easily. Digital study casts can be used for patient motivation. Stores original malocclusion in 3D formate.    Disadvantages If the plaster dental casts are poor, than the obtained digitalized images will be altered during digitization . Dental images in mixed dentition are difficult to recognize and measure. Digitalizing dental casts is a laborious process that has always to be made under the same conditions.
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