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19 Cards in this Set
- Front
- Back
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What are 3 aspects to optimal pontic design ?
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1. Biologic 2. Mechanical 3. Esthetic |
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3 components of biologics of pontic design
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1. Cleansable tissue surface 2. Access to abutment teeth 3. No pressure on ridge |
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3 esthetic components of ethetics of pontic
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1. Shaped to look like tooth it replaces 2. Appears to "grow" out of edentulous ridge 3. sufficient space for porcelain |
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Ideal shaped ridge for pontic design
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- smooth, regular surface of attached gingiva, which facilitates maintenance of a plaque-free environment |
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What are facial ridge requirements for pointic?
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- must be free of frenum attachment - must be of adequate facial height to sustain the appearance of interdental papillae |
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Loss of residual ridge contour leads to what 3 things?
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1. unesthetic open gingival embrasures (black triangles) 2. food impaction 3. percolation of saliva during speech |
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Class I residual ridge defect
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faciolingual loss of tissue width with normal ridge height
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Class II residual ridge defect
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Loss of ridge height with normal ridge width
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Class III residual ridge defect
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combination of loss in both dimensions: width and height
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4 types of mucosal contact pointics
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1. saddle ridge-lap 2. conical 3. modified ridge-lap 4. ovate |
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Sanitary/hygienic Pontic - Recommended Location - Advantage - Disadvantage |
- Posterior mandible - good access for oral hygiene - poor esthetics |
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Saddle ridge-lap pointic
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NOT recommended - unable to cleanse |
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Conical abutment - recommended location - advantage - disadvnatage |
- molars w/o esthetic requirements - good access for oral hygiene - poor esthetics |
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What pontic design is used for very high esthetic areas
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Ovate pontic |
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Disadvantages of ovate pontic
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1. requires surgical preparation 2. not indicated for residual ridge defects |
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The passive contact should occur exclusively on ______________ tissue.
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keratinized |
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What happens if a pontic rests on mucosa?
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Some ulcerations may appear as a result of the normal movement of the mucosa in contact with the pontic
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What can cause positive ridge pressure?
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by excessive scraping of the ridge area on the definitive cast
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Pontic should be
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nln
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