Bridges Flashcards
What type of bridge design is this?
Cantilever
Describe the abutment tooth status, occlusion and OH when a RBB may be indicated
- Patients with sound abutment teeth (no restorations)
- Occlusion well controlled
- Good oral hygiene
What are the disadvantages of a RBB?
- Aesthetic concern if metal retainer shines through abutment tooth
- Chance of debonding
- Longevity concerns
What is panavia used for?
Cementation of a RBB
What is the ideal shape of a pontic?
Ovate shape is ideal
(oval outline)
What type of bridge design is this?
Fixed-fixed
Why may you have to accept a shortened dental arch in elderly patients?
Choose not to have prosthesis as space replacement
In older patients with reduced manual dexterity it may be appropriate to accept a short dental arch
What type of radiograph would you need prior to preparation for a bridge?
Ensure you have a contemporary periapical radiograph of the teeth to be prepared
What are some advantages of bridges over implants?
Less clinical time
Cheaper than implants
Failure of treatment is less catastrophic
Why may a RBB fail?
- Pontic is involved in guidance (Mandible excursion movement)
- Parafunctional habits
What type of bridge design is this?
Fixed-fixed
What is the role of a connector in a RBB?
The connector is the metal element that joins the wing and the pontic substructure.
What type of bridge design would you consider for missing teeth accros the midline?
Fixed-fixed
What type of bridge design is this?
Fixed-fixed
What type of bridge design is this?
Cantilever
What is a wing from a RBB normally fabricated from?
Non precious metal alloy
(Nickel-Chromium alloy or cobalt-chrome)
What are the materials for a pontic component of a bridge?
The pontic is usually porcelain fused to metal substructure
Describe how differential movement affects a cantilever bridge
Differential tooth movement results in less stress on the bond
Higher success rate (in most situations)
What type of bridge design is this?
Fixed-movable
What are some factors that affect the longevity of bridge?
Design (cantilever, fixed-fixed)
Surface coverage (partial or complete)
Connector height (short /long)
Preparation of abutment tooth
Metal surface treatment (sandblasting, silicoating)
Rigidity of framework
Occlusal considerations
Extend of span
Operator experience
What are the advantages of a RBB?
- Minimally invasive
- Inexpensive (compared to conventional)
- Little clinical time
- High success rate (predictable outcome)
What are some contraindications of RBBs? (4)
- Heavily restored abutment teeth
- Lack of clinical crown height in the abutment teeth
- Significant bruxism and parafunctional activity
- Teeth with extensive bone loss
What RBBs have the most favourable prognosis?
What teeth are being replaced
Maxillary incisor replacement
How many teeth can be included in a posterior RBB?
A RBB can only replace a single posterior tooth
Why is a cantilever bridge considered less mechanically sound compared to a fixed-fixed bridge?
In a cantilever bridge the load is transmitted to one abutment whereas in a fixed-fixed thereare multiple abutments allowing an equal load across these teeth.
What are the 3 components of a RBB?
Connector
Wing
Pontic
Why should tooth position be considered when treatment planning with bridges?
It is important to consider if spacing and alignment of natural teeth are favorable to success/longevity of treatment
What dental defects may a RBB be indicated in?
Hypodontia (not microdontia)
What type of bridge design is this?
Cantilever
In terms of a RBB contacting with an opposing tooth what should be avoided?
Avoid sharing contacts between retainer (wing) and tooth
Cantilever bridges can be either mesial or distal which ones have better longevity?
Mesial meaning Pontic is mesial
Distal meaning Pontic is distal
Mesial cantilevers
Which of these cements are:
Dual-cure or Self-cure
Fluoride-releasing or Does not contain fluoride
Panavia F 2.0 is a dual-cure, fluoride-releasing adhesive resin cement
Panavia 21 is self-cure and does not contain fluoride
How may the periodontal status of an abutment tooth affect your tx planning?
Abutments with active periodontal disease should be avoided
As increased functional loading = increased rate of periodontal destruction
What do bridges rely on for retention?
Rely on composite resin cements
