Replacement of Missing Teeth

24 important questions on Replacement of Missing Teeth

What are the appliance options for teeth replacement?

1. Removable - acrylic denture, cobalt-chrome denture
2. Fixed -  resin-bonded bridge, conventional bridge, implant

When is a full denture used?

When all upper and lower teeth are missing

What are the things to consider when decision making for patient's denture?

1. Number and status of remaining teeth
2. Future tooth loss
3. Palatal coverage
4. Financial factor
5. Aesthetics
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Which type of bridge attaches via metal wings?

Resin bonded bridge

Which type of bridge attaches via crowns?

Conventional bridge

What is a resin-bonded bridge (RBB)?

A type of bridge consisting of a porcelain tooth with a metal wing that bonds to the back of the adjacent tooth.

What are the advantages of resin-bonded bridge (RBB)?

1. Minimally invasive
2. Suitable alternative for nervous or needle phobic patient
3. Shorter appointment times
4. Lower cost
5. More favourable mode of failure compared to conventional bridge 

What are the indications of resin-bonded bridge (RBB)?

Minimally restored abutment tooth = substantial enamel available
Short edentulous span
Good moisture control

What are the contraindications of resin-bonded bridge (RBB)?

Heavily restored abutment tooth = reduced enamel
Mal-aligned abutment
Unfavourable occlusal schemes
Allergy to base metal alloy   

What is a conventional bridge?

Conventional bridge consists of porcelain teeth joined together with crowned teeth on either side.

What are the two materials available for conventional bridge?

Porcelain fused to metal (PFM) or all ceramic

What are the advantages of conventional bridge?

Less likely to debond compared to RBB
Better longevity
Suitable for longer spans
(can replace more than 1 tooth)
Can alter the shape and appearance of abutment teeth 

What are the indications of conventional bridge?

When abutment teeth are heavily restored and would benefit from crowns

What are the disadvantages of conventional bridge?

Extensive removal of tooth tissue
10-20% risk of nerve death in abutment teeth
More catastrophic mode of failure compared to RBB

What are the two possible designs of conventional bridge?

Cantilever design and fixed-fixed design

What are the indications of cantilever design?

Replacement of one tooth
Patient has favourable occlusion
Periodontally stable abutment tooth  

What are the indications of fixed-fixed design?

1-2 missing teeth
Heavily restored abutment teeth
Angulation of abutment teeth is favourable  

What serves as the foundation for prosthetic restoration?

Implant

What is the commonly used material for implants?

Titanium

What needs to considered when selecting the implant material?

The material needs to be biologically inert (minimal interaction with living tissues) and biocompatible with bone

What is an absolute contraindication for implants?

Uncontrolled metabolic diseases

What are relative contraindications for implants?

Bone metabolism disorders and immune system disorders or issues
- immunocompromised patient
- diabetes
- osteoporosis
- bisophosphonate usage
- medical treatment (chemotherapy, irradiation of head and neck)

What are factors to consider when decision making for implants?

1. Bone height and width available
2. Bone quality
3. Relevant anatomy
4. Magnitude of defect of bone and soft tissue
5. Occlusion
6. Parafunction
(habits like bruxism, clenching when stressed)
7. Smoking   

What are factors to consider when treatment planning for replacement of missing teeth?

1. Clinical knowledge and recommendation
2. Age
3. Patient preference
4. Financial considerations
5. Joint discussion and decision with patient
6. Patient's best interest     

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