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Construction of Base Plates and Occlusal Rims

DA122 Dental Materials

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Base plate and occlusal rims

• One of first steps in construction of dentures– Base plate-represents body of denture– Occlusal rim-wax block. Used by lab technician

to place denture teeth

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Steps

• The teeth are articulated in the lab, tested in the patient’s mouth-final fittings completed

• Last step-construction of dentures:– Investment or covering of rims– Wax is replaced by acrylic-forms denture base

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Denture Teeth

• Setting teeth in wax

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Video

• http://www.youtube.com/watch?v=KV_tCpfnh5w

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Lab Activity

• 1. Prepare edentulous model– Use marker or pencil to mark around area where

denture will fit– Sprinkle model with baby powder

• 2. Soften a half sheet of baseplate wax with alcohol torch

• Using gloved fingers press wax onto form

• 3. Trim excess wax with a lab knife or scalpel

• 1/6 to ¼ inch around mucobuccal fold area

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Lab continued

• 4. Contour wax into mucobuccal fold-pressing against plate and conforming to pencil line– Use a pencil eraser – Do not tear wax