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Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED. 1
PowerPoint® Presentation for Dental Materials with Labs
Module:
Prosthodontics: Fixed Prosthodontics
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Module: Prosthodontics: Fixed Prosthodontics
Prosthodontics: Fixed
Prosthodontics
Part A: Types of Fixed Prosthetics
Part B: Fixed Prostheses Procedures
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Module: Prosthodontics: Fixed Prosthodontics
Learning Objectives1. Define the Key Terms.2. Describe various types of fixed prostheses and their functions.3. Describe dental materials used in fixed prostheses.4. Explain the role of the dental assistant in fixed prosthodontic treatment.
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Fixed Prosthetics
Learning Objectives
5. Demonstrate assisting during a crown
preparation appointment.
6. Demonstrate assisting during a crown cementation appointment.
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Key Terms
• Abutments• Bite registration• Cosmetic/esthetic
dentistry• Dental casting alloy• Fixed prosthodontics• Full-cast crown• Inlays• Maryland bridge• Onlays
• Partial crown• Pontic• Porcelain-to-metal
crowns• Post-retained cores• Prostheses • Retention core• Retention pins• Shade guide• Veneers
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Part A: Types of Fixed Prosthodontics
Purpose of Prosthodontics
Restore masticatory function
Improve appearance
Improve speech
Promote good oral hygiene
Stabilize arch and occlusion
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Contraindications for a Fixed Prosthesis
Lack of supporting alveolar bone
Presence of periodontal disease
Excessive mobility of abutment teeth
Lack of patient interest in oral hygiene
Patient cannot afford treatment
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Cosmetic Dentistry
Esthetics
Closing a diastemaOrthodontics
Changing
shadeOcclusion
Tooth
whitening
Changing
shape
Restoring
strengthVeneers
Repairing
fractures
Tooth
lengthening
Crowns and
bridges
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Types of Fixed Prostheses
Porcelainveneers
Directresin
veneers
Indirectresin
veneers Bridges
Onlays
Partialcrown
Full-castcrown
Fixed prostheses
Inlays
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Materials Used for Fixed Prostheses
Compositeresin
Porcelain
Porcelainfused to metal
Goldalloy
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Retention of Restorations
• Core buildup– Recreation of lost tooth structure
• Retention pins– Screwed into dentin– Hold core filling material
• Post and core– After root canal therapy– Strengthens tooth
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The Dental Laboratory
• Dental lab technician– Fabricates restoration– Makes die from impression– Creates wax pattern on die – Invests wax and casts invested material into
metal– Prepares metal for porcelain layers– Finishes and polishes final restoration
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Dental Assistant Responsibilities
• Communicate closely with lab technician
• Dental assistant– Inform patient of procedure steps– Prepare equipment and supplies– Assist dentist during procedure– Expanded functions in many states– Coordinate patient appointments– Some lab procedures performed in office
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Part B: Fixed Prosthesis Procedures
Crown preparation set-up
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Selecting a Tooth Shade
• Before preparation• Moisten shade guide• Match to natural teeth
under natural light• Record in patient’s
chart• Record on lab
prescription
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Margin Preparations
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Tissue Retraction
• Placed in gingival sulcus
• Mechanical and chemical retraction
• Prevents bleeding
• Ensures impression of gingival margin
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Elastomeric Impressions
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Provisional Restorations
Temporary coverage to protect toothbetween appointments
Fit gingival margin snugly
Protect gingiva and interproximal areas
Stabilize contacts and occlusion
Esthetics and patient comfort
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The Laboratory Prescription
Descriptionof prosthesis
Dentist’sinformation
Date requested
Materialsfor prosthesis
Patient’s name
Toothshade
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Crown Cementation
• Check fit
– Margin
– Contacts
– Occlusion
• Adjust if necessary
• Permanent cement
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Fixed Prostheses Maintenance
• Crowns• Bridges• Dental
implants
Antimicrobialrinses
Waterirrigators
Interproximalbushes
Dental floss
Threadingsystems
Toothbrush
Plaqueremoval
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Assessment Questions
• What is the term for the tooth being replaced in a bridge?
The pontic • What is the term for the stabilizing teeth on each
side of the pontic?
The abutments• Where is the gingival retraction cord placed?
In the gingival sulcus around the collar of the tooth
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Summary of Module
• Key Terms
• Types of fixed prosthetics
• Fixed prostheses procedures