The golden proportion in esthetic treatment planning

1,775 views

Published on


Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.

Published in: Education

The golden proportion in esthetic treatment planning

  1. 1. The golden proportion in estheticThe golden proportion in esthetic treatment planningtreatment planning INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. introductionintroduction • Beauty is in the eye of the beholder • Perception of beauty in the brain • esthetics – the branch of philosophy dealing with beauty www.indiandentalacademy.com
  3. 3. Fibonacci numbersFibonacci numbers • Presented 1202 by Filius Bonacci in text Liber Abaci • The series is 0,1,1,2,3,5,8,13,21,34,55,89,144….. • Likened to multiplication of rabbits • Each no. is 1.618 times the previous no. www.indiandentalacademy.com
  4. 4. www.indiandentalacademy.com
  5. 5. Golden sectionGolden section • Known since 550 B.C. to Egyptians and Greeks • Marvellous as it is perceived as beauty, harmony and balance • Static symmetry vs. Dynamic symmetry • 1.618/1 = 0.618 referred to as Ф after phidias • Kepler in 1600 callled it as divine proportion • Key to normal morphology • Natural law of growth of animals and plants www.indiandentalacademy.com
  6. 6. Clinical application in dentistryClinical application in dentistry • width of 1┘: 1┐= 1.618 • Lower incisors width : upper intercanine width = 0.618 • Found in people with most attractive smiles, faces and most graceful figures • Fundamental component of major biologic plan www.indiandentalacademy.com
  7. 7. Golden rectangleGolden rectangle • Base of 1.0 and perpendicular side 1.618 • E.g. playing cards, credit cards, picture frames, 3”* 5” postcards • Golden triangle, pentagon, spirals • Dynamic: seem to display some sort of life, animation • Golden divider by Robert M. Ricketts www.indiandentalacademy.com
  8. 8. www.indiandentalacademy.com
  9. 9. Why it worksWhy it works • Face, jaws and teeth as geometric structures present more esthetics if they align more with GP • Referred to as golden to each other • Smile analysis by several investigators confirm presence of GP www.indiandentalacademy.com
  10. 10. CompositionComposition • Study of objects made visible by contrasts in color , line and texture • Components • Unity : oneness, ordering of parts of a composition to give the individual a total, whole effect • Static dynamic • Regular geometry logarithmic spirals • Passive, inert dynamic, living www.indiandentalacademy.com
  11. 11. • Cohesive elements : tend to unify a composition • Repetition of shape, line and color • Unfortunately appear static or dead • Arrangement of maxillary ant. Teeth to a circle • Segregating elements: introduce unity with variety • Hogarth’s line of beauty • introduced to teeth arrangement www.indiandentalacademy.com
  12. 12. DominanceDominance • One shape, color should dominate • Others subservient • E.g the maxillary central incisor is the most dominant tooth by virtue of it’s visible size • Not maxillary cuspid as only mesial side is visible • Mouth is the dominant feature of the face www.indiandentalacademy.com
  13. 13. ProportionProportion • Golden proportion is ideal guide • Disadvantages • Unfortunately applied unilaterally • Malaligned teeth, overlap, diastemas • Requires calliper and calculator www.indiandentalacademy.com
  14. 14. www.indiandentalacademy.com
  15. 15. Golden percentagesGolden percentages • Calculated as total sum / individual ratio i.e. 0.618+1+1.618+1+0.618=6.472/ individual ratio • 10%-15%-25%-25%-15%-10% • Does not depend upon lateral incisors only but the individual tooth’s contribution to whole • Teeth with identical width generate identical % • Asymmetry clearly identifiable and quantifiable www.indiandentalacademy.com
  16. 16. Smile analysisSmile analysis • Repeatable, measurable objective principles can be applied o improve esthetics • Consider the following factors in the dentofacial analysis • Upper lip position – high, average or low • Upper lip curvature • Parallelism of maxillary incisal curve with lower lip • Relation between maxillary anteriors and lower lip • Number of teeth displayed in a smile • Midline relation of the central to the philtrum www.indiandentalacademy.com
  17. 17. • Interpupillary line to midline of face • Midline of teeth to midline of face • Lip symmetry • Profile ( influences dominance given to centrals) • The negative space • Buccal corridor www.indiandentalacademy.com
  18. 18. Dental analysisDental analysis • Width and height of existing teeth • Proportion • Parallelism • Axial inclination, rotation, malposition • Gingival characteristics www.indiandentalacademy.com
  19. 19. Smile designSmile design • Age, sex and personality • Oral health • Three factors effecting smile design • Symmetry across midline • Anterior or central dominance • Regressive proportion www.indiandentalacademy.com
  20. 20. Treatment planningTreatment planning • Step 1 – establish facial symmetry and midline • Interpuppilary line // horizon • Placement of midline at exact center – artificial • Eccentric unexaggerated midline – natural illusion • Maxillary midline and facial /labial frenum midline – 70.4% • Do not use mandibular midline • Stable positioning without leanings to left or right www.indiandentalacademy.com
  21. 21. • Step 2 – record the highest lip line • Height of upper lip at full smile • Length of centrals • Amount of visible gingiva • Photographs or manual • Ideal smile, gummy smile or long lip smile • Obvious gingival asymmetry noted • Postion of lateral incisor www.indiandentalacademy.com
  22. 22. • Step 3 – take photographs • As viewed from the front • Lips retracted • Horizontal frame should // interpupillary line • Or vertical margin // the facial midline • 8” from centrals , 1: 2 magnification www.indiandentalacademy.com
  23. 23. Grid analysis systemGrid analysis system • Given by CK Naylor • Incorporation of midline axis, incisal plane, highest lipline, proportionate contact areas forms a grid • Provides a method of demonstrate variations from esthetic arrangement of anterior teeth www.indiandentalacademy.com
  24. 24. www.indiandentalacademy.com
  25. 25. • Step 4 – draw the lines on the photograph • aim to coincide with idealized positions of • Incisal plane- // upper or lower frame at the position of idealized incisal edge • Incisal edge- cornerstone and set to correct level determined for the pt’s smile • Visibility at rest and lip mobility • Incorporated to grid and verified in mock up • Highest lip line drawn • Midline axis drawn perpendicular to the incisal plane www.indiandentalacademy.com
  26. 26. • Proportionate placement of contact areas • Cental incisor to lateral incisor establishes the former as dominant factor in the composition • Repeated proportion by Lombardi between CI, LI and canines • Most followed is golden proportion (1/1.618=0.618) • CI= 9mm → LI = 9*0.618= 5.56mm • Golden percentages can be used www.indiandentalacademy.com
  27. 27. RED ProportionRED Proportion • Recurring esthetic dental proportion • Basically implies not to follow the 62% proportion • States that proportion of the successive widths of the teeth as viewed from the frontal should remain constant as one moves distally dentist can define his own RED proportion • Several studies have reported mean proportions of 66-78% for LI: CI www.indiandentalacademy.com
  28. 28. www.indiandentalacademy.com
  29. 29. • Step- 5 treatment phase • Carried out in mouth based on the grid system • Final result visualized with mock up or provisionals • Conventional therapy constituted after patient’s consent. www.indiandentalacademy.com
  30. 30. ConclusionConclusion • Golden proportion ids the starting point in smile design • Strict adherence to it is questionable but it serves as useful tool for initial evaluation of dominance and proportion www.indiandentalacademy.com
  31. 31. www.indiandentalacademy.com

×