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19 Cards in this Set
- Front
- Back
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What are the types of bridges?
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Conventional tooth supported
Resin-bonded tooth supported |
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Indications for conventional tooth supported bridges?
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Posterior span 2 missing teeth or fewer
Incisors: 4 missing teeth or fewer Abutments are periodontally sound Edentulous span short and straight |
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Indications for resin-bonded tooth supported?
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Single missing tooth
Possible for 2 incisors Younger patients (large pulps) Not fully developed muscles of mastication |
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Indications for Removable Partial denture?
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Edentulous space:
- posterior: > 2 - anterior: > 4 incisors - canine: with 2 contiguous teeth - no distal abutment (cantilever) - multiple spaces Abutment Tipped teeth Divergent alignments Periodontally weakened primary abutments Teeth with short clinical crown Insufficient number of abutments Cost |
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Indications for implant-supported fixed partial denture
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Single tooth
2 - 6 unit span pier in a pontic span Inadequate strength in the abutments Insufficient no. of abutment teeth Span length limited by availability of alveolar bone (density and thickness) |
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What are the components of bridge?
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Retainer
Connector Pontic |
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Types of connectors in bridges?
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Rigid
Non rigid |
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What are the important factors when it comes to Pontics in bridges?
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Cleansability
Appearance Strength |
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What are the abutment considerations?
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Crown-root ratio
Root configuration Periodontal ligament area |
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What is the ideal crown:root ratio?
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2 crown: 3 root
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Which root configuration is more ideal?
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A
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Which root-configuration is more ideal?
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B
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What is Ante's law?
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The root surface area of abutment hast to be equal or greater than the teeth being replaced with pontics
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What are the biomechanical considerations?
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1 deflection of a fixed partial denture is proportional to cube of the length
2 Defelction of a fixed partial denture inversely proportional to cube of the occlusogingival thickness |
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What are the types of bridges?
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Fixed-fixed
Fixed-movable Cantilever Resin-bonded (Maryland) Combination design |
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Fixed-fixed bridge
Pros and cons |
ADVANTAGES
• Maximum retention and strength • Abutment teeth are splinted together • Larger bridges • Construction straightforward in the laboratory (no movable joints) DISADVANTAGES • Preparations slow and difficult: parallelism • More tooth reduction: endanger pulp, less retention, extensive destruction • Cementation difficult (in one piece) |
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Fixed-movable bridge
Pros and cons |
ADVANTAGES
• Preparations do not need to be parallel – abutments can be divergent • Abutments with independent design – more retentive • Preparation less destructive • Allows minor movements of teeth • Cementation easy DISADVANTAGES • Length of span limited • Complicated to construct (laboratory) • Difficult to make temporary |
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Cantilever bridge
Pros and cons |
ADVANTAGES
• Most conservative design • 1 abutment = no need of parallelism • 2 or more abutments = teeth adjacent – easier to prepare • Easier maintenance and cleaning • Construction straightforward in the laboratory DISADVANTAGES • Relatively small retentive area • Vulnerable to debonding through torquing forces • Construction of the bridge must be rigid to avoid distortion |
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Resin-bonded bridge (Maryland Bridge)
Pros and cons |
ADVANTAGES
• Pulp is not at risk from the preparation • Technique mostly reversible • Temporary restorations are not required • Generally less expensive than conventional bridges DISADVANTAGES • Thickness of tooth is increased • Retainer produce ledge – plaque accumulation • Short survival |
