Elements of Smile Design Flashcards
what is involved in the esthetic analysis
- facial symmetry
- smile symmetry
- occlusion
- tooth shape and color
what type of data should be collected
- preclinical interview
- intra-oral photography
- diagnostic casts with facebow transfer
- comprehensive dental exam
- esthetic analysis
what is observed in facial symmetry
- inter pupillary line
- midline axis
- commissural line
- occlusal plane line
what are used for the anatomic midline
cupids bow and philtrum
the dental midline refers to:
the vertical contact interface between two maxillary centrals
the dental midline should be coincident with:
the facial midline axis
the dental midline is not noticeable by most people up to ____ as long as it is parallel to the midline axis
4mm
max and mand dental midlines do not coincide in about _____ of cases
75%
canted dental midline is _____ esthetically unpleasant and more noticeable than shifted midline
more
what is observed in smile symmetry
- buccal corridor
- smile line
- tooth reveal
- gingival height and position
smile line influences the final configuration of:
- the incisal edge position
- crown form
- length of the maxillary anterior teeth
acceptable results in smile symmetry occur when:
- the maxillary incisal edges are parallel to the line of the lower lip
- the lateral incisors are 0.5mm to 1.5mm above the lower lip line
- the centrals and cuspids will approximate the lower lip near or at the vermillion border
what is the buccal corridor
the area distal to the canines between the buccal surfaces of the posterior teeth and the buccal mucosa. it enhances or detracts from symmetry
what factors are assessed in the buccal corridor
- negative space
- canine prominence
- value/color of premolars
- position of premolars
- tone of facial muscles
what is evaluated in tooth reveal
evaluation of upper lip line, lip movement (hyper vs hypo) and position (high vs low) and its effect on tooth exposure
- line connecting papillae will ideally follow upper lip contour
- exposed tooth at rest can impact perceived age
youthful smile shows ____ of centrals
2-4mm
adults show ____ of tooth
2mm
which gender shows more tooth at rest
females
what is the lip line
the amount of vertical tooth exposure in smiling
- the height of the upper lip relative to the maxillary central incisors
what is a normal lip line
more than 75% of central incisors - 2mm of gingival display
what is a low lip line
less than 75% of central incisor display during smiling
what is a high lip line
more than or equal to 3mm gingival display during smiling
what does upper lip form refer to
the curvature of the upper lip during smiling
what is the upper lip form assessed by
the position of the philtrum in relation to the commissural ine
describe the ideal gingival height and position
- the gingival zenith of the centrals should be symmetrical to one another and relatively equal in height to the canines
- the gingival zenith of the laterals should be equal to or slightly incisal to the central incisor gingival level
- zenith points are usually slightly lateral to midline axis of the tooth
what are the types of guidance in occlusion
- anterior or group function; shallow vs deep
what should be considered for parafunctional habits in occlusion
consider hard or soft appliances
what are the location of occlusal contacts
- class III
- deep bite
- open bite
- cross bite
what are the size and proportion considerations for tooth shape
- large vs small
- tall vs short teeth
- width to length proportions within the same tooth or among adjacent teeth
what are the types of tooth form
square, ovoid, tapered or combinations
what are the texture and surface considerations for teeth
smooth vs textured eg prominent MR and perikaymata
what are the width to length proportion of max CI
77-86%
- CI is 2-3mm wider than LI
- CI is 1-1.5mm wider than canines
- CI and canine touch OP while LI is 0.5-1mm shorter giving the characteristic “Gull” shape of the incisal edges of anterior teeth
what are the color considerations
- value: grey scale or brightness
- chroma- saturation or intensity
- hue- gradation or variety of a color
what are the examples of value
- Vita Classic: light to dark B1-C4
- Vitapan 3D: light to dark: 0M1 to 4M4
mature patients have a _____ saturation
high
young patients have a _____ satuaration
low
hue can be affected by colors from:
lipstick
what are the 3 hues
A, B, D in USA with more C category in europe
_____ have the highest value
centrals
_____ have the lower value and greater chroma
cuspids
