ANTERIOR TOOTH SELECTION. SIZE OF THE TEETH Selection of the size and the teeth is a problem in...
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![Page 1: ANTERIOR TOOTH SELECTION. SIZE OF THE TEETH Selection of the size and the teeth is a problem in three dimension. First we have to consider whether to.](https://reader036.fdocuments.us/reader036/viewer/2022062304/56649eb25503460f94bb8d4b/html5/thumbnails/1.jpg)
ANTERIOR TOOTH SELECTION
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SIZE OF THE TEETH
• Selection of the size and the teeth is a problem in three dimension .
• First we have to consider whether to use porcelain or acrylic teeth.
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SIZE OF THE FACE
• The average width of the maxillary central incisor is estimated to be one sixteenth of the face measured between the zygoma.
• The size of the maxillary central incisor is important for they are the most prominent teeth in arch as individual is viewed from frontal position.
• “the tribute tooth indicator” is useful in determining the maxillary central incisor.
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SIZE OF THE MAXILLARY ARCH
• The mold selector can be used to make measurement of the maxillary cast.
• Accurately contoured occlusion rims are required
• The mold selector is used in the selection of anterior teeth .The measurments are made from the midline on the maxillary occlusion rim to the distal of the cuspid eminence
• Measure the distance from the distal of one cuspid eminence to the distal of the other with a flexible.
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MAXILLARY MANDIBULAR RELATION
• Any disproption in size between thr maxillary and mandibular arches influence the length, width, and the position of the teeth.
• In instances of protruded mandible, the mandibular anterior teeth are frequently larger than normal. If the mandible are retruded the mandibular anterior teeth are frequently smaller.
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INCISAL PAPPILAE & THE CUSPID EMINENCE OR THE
BUCCAL FRENUM• If the cuspid eminence are visible, a line can be
placed on the cast at the distal termination of the eminence.
• If the cuspid eminence are not visible the attachment of the buccal frenum can be used. A line placed slightly anterior to the frenum attachment will be distal of the eminence.
• Measure the distance from the distal of one cuspid eminence to the distal of the other with a flexible.
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CONTOUR OF THE RESIDUAL RIDGE
• The artificial teeth should be placed to follow the contour of the residual ridges that existed when the natural teeth were present.
• The loss of contour as a result of resorption, accident or surgery makes this a difficult task.
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THE VERTICAL DISTANCE BETWEEN THE RIDGES
• The length of the teeth is determined by the available space between the existing ridges.
• When the space is available, it is more esthetically acceptable to use a tooth long enough to eliminate the display of the denture base
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THE LIP
• When the lips are relaxed and apart the labial surface of the maxillary anterior teeth support the upper lip.
• The incisal edge extends inferior to or slightly below the lip margin.
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Length
• The length of the upper six anterior teeth is normally such that the neck of the teeth will overlap the anterior ridge by 2-3mm
• Cervically up the incisive edges of the centrals will show below the relaxed lip.
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HARMONY
• The face length is taken from supra orbital ridge line to inferior border of the chin.
• Breadth is the distance between the zygomatic process
• The length is greater than width would indicate teeth of htose proportions, irrespective of their shape.
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BERRY’S BIOMETRIC INDEX
• Used to derive the length of central incisor using zygomatic width or the length of the face.
• Width of the maxillary central incisor=zygomatic width/ 16 =length of the face/20
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POUNDERS FORMULA
• To determine the length and width of central incisor using the zygomatic width and length of face respectively.
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WIDTH
• Most satisfactory way of selecting teeth width
• Choose a set which are wide enough to allow the canines to be mounted on the canine eminence when set up.
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GOLDEN PREPORTION
• G.P for each patient is measured as follows • The width of the central incisor was multiplied by
62% and compared with the width of central incisor is in G.P to the width of lateral incisor.
• In comparing with the width of lateral incisor multiplied by 62% with the width of adjacent canine it can be determined if the width of lateral incisor is in golden proportion to the width of canine.
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PHYSIOLOGICAL
• The facial musculature contributes to esthetics of the patient
• Increasing the thickness of the denture base in the labial and the buccal sulci can produce a puffy appearance.
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PSYCHOLOGICAL
• A patient with a +ve self evaluation shows a broad smile up the one width a negative self evaluation shows a tight lipped small smile
• The campers line the psychological plane of orientation
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BIOMECHANICAL
• The teeth should be placed such that they fulfil the biomechanics of the denture.
• The teeth should be set in the neutral zone.
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COLOUR OR SHADE
• Colour is described by means of
• hue
• Chrome
• Value
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FORM OF THE ANTERIOR TEETH
• The form of the teeth should be coformed to contour of the face as considered from the labial, mesial, distal and incisal aspect
• The general outline of the tooth should conform to the general outline of the face when viewed from frontal aspect.
• Three factors are used as guides in the selection of anterior teeth for form.
1. Sex 2. The form and contour of the face 3. Age
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THE FORM AND CONTOUR OF THE FACE
• According to Leon Willians classification face
• Three types
1. Square
2. Tapering
3. Ovoid
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SEX
• Dentogenic concept : sex, personality, age , are the factors which determine the form of anterior tooth