Steiner analysis /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.

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Steiner analysis /certified fixed orthodontic courses by Indian dental academy

  1. 1. “STEINER’S ANALYSIS” INDIAN DENTAL ACADEMY Leader in continuing dental education
  2. 2. introduction Cecil C. Steiner in 1930 proposed the appraisal of various parts of skull separately namely skeletal,dental & soft tissue Skeletal analysis entails relating the upper & lower jaw to the skull & to each other Dental analysis entails relating upper & lower incisors teeth to respective jaws & to each other. Soft tissue appraisal provides a means of assessing the balance & harmony of the lower facial profile. He selected sella nasion as reference line
  3. 3. STEINER’S ANGLE SKELETAL DENTAL -SNA -SNB -ANB -occlusal plane -mandibular plane -maxillary incisor position -mandibular incisor position -interincisal angle -lower incisor to chin SOFT TISSUE -S line
  4. 4. MAXILLA (SNA) - A & B are regarded as anterior limits of apical bases of maxilla & mandible. - Determines whether the maxilla is positioned anterior / posterior to the cranial base - Angle formed between S-N & N-A - Mean is 82 - Greater angle indicates relative forward positioning of maxilla & lesser angle indicates recessive location of maxilla
  5. 5. MANDIBLE (SNB) - formed between S-N & N-B to access the mandible in relation to the cranial base. - Mean is 80 - Angle less than 80 indicates recessive mandible while greater angle suggest Prognathic mandible
  6. 6. RELATIONSHIP OF MAXILLA TO MANDIBLE (ANB) - angle provides a general idea of anterioposterior discrepancy of maxilla to mandibular apical bases - Mean is 2 - Greater than the mean indicates a class II skeletal tendency, angle less than 2 & below zero indicates the mandible located ahead of maxilla suggesting class III
  7. 7. OCCLUSAL PLANE - drawn through the region of overlapping cusps of 1st premolars & 1st molars - Angle of occlusal plane & S-N is measured - Mean reading is 14
  8. 8. MANDIBULAR PLANE - drawn between gonion & gnathion - Angle is formed relating to the anterior cranial base - Mean reading is 32 - Excessively high or low mandibular plane angles suggest unfavorable growth pattern in individuals
  9. 9. MAXILLARY INCISOR POSITION - formed by intersection of long axis of upper central incisors & line joining N-A line - upper incisor to N-A in degree indicates relative angular relationship of upper incisor teeth i.e.22 , while upper central incisor to N-A in mm gives the relative forward or backward positioning of incisor teeth to NA line i.e. 4mm
  10. 10. MANDIBULAR INCISOR POSITION - formed between long axis of lower central incisor & N-B plane - Indicate inclination of lower central incisors with a mean value of 25 increased value indicates proclined lower anteriors - Linear distance between labial surface of lower central incisors to N-B line for the assessment of lower incisor inclination. The normal value is 4mm
  11. 11. INTERINCISAL ANGLE - is the angle formed between the long axis of upper & lower central incisors - Mean value of 130-131 - Reduced angle suggest class II div 1, larger angle indicates class II div 2
  12. 12. LOWER INCISORS TO CHIN - according to Holdaway’s the distance between the labial surface of lower incisors to N-B line must be equal - 2mm of discrepancy is expectable - 3mm is less desirable, but tolerable - More than 4mm indicates corrective meassures
  13. 13. SOFT TISSUE ANALYSIS - S line : the lips in a well balanced face should touch a line extending from soft tissue contour of the chin to the middle of an “S” formed by the lower border of the nose - If the lips are located beyond this line lips are believed to be protrusive & interpreted as convex profile - If line behind this line said to be retrusive with a concave profile.
  14. 14. Thank you For more details please visit