Abutment Assessment and Tx Planning (Combined) Flashcards Preview

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Flashcards in Abutment Assessment and Tx Planning (Combined) Deck (33):

What are 3 options for replacing a missing tooth?

1. RPD
2. FPD tooth supported
3. FPD implant supported


What are the indications for an RPD?

1. Edentulous space >2 posterior teeth
2. Edentulous space > 4 incisors
3. Edentulous space that includes a canine and 2 other contiguous teeth
4. No distal abutment


What are the indications for a Fixed Partial Denture?

1. Abutment teeth bound edentulous space
2. Abutments periodontally sound
3. Retainers designed and executed well
4. Patient highly motivated
5. Patient can afford the treatment
6. No gross soft tissue defect in edentulous ridge


What are some contraindications for FPD?

1. Dry mouth (caries risk)
2. Short clinical crown teeth
3. Tipped teeth adjoining edentulous space


What is a conservative restoration that is reserved for use on defect-free abutments in situations where there is a single missing tooth, usually an incisor or premolar?

Resin bonded tooth supported FPD


Why is a resin-bonded FPD useful in younger patients whos immature teeth with large pulps?

It requires shallow prep only into enamel decreasing pulp exposure risk


What are 3 things to consider when evaluating abutment teeth for FPD?

1. Crown:Root ratio
2. Root configuration
3. PDL


What is the optimum crown tp root ratio for a tooth to be utilized as a FPD abutment?

2:3, 1:1 is minimum


When could a crown to root ratio of less than 1:1 be acceptable for an FPD abutment tooth?

If abutment opposes another FPD because occlusal load will be less


Is the crown to root ratio alone an adequate criteria for evaluating a prosprective abutment tooth?



What is the preferable root configuration for an abutment tooth: broader labiolingually than mesiodistally, or roots that are round in cross section?

1. Roots broader labiolingually than MD
2. Conicals useful in short span FPD
3. Wider spaced roots in posterior more favorable
4. If conical root has bends it is more favorable than straight tapered root


What principles states that the root surface area of the abutment teeth has to equal or surpass that of the teeth being replaced with pontics?

Ante’s law


What is a general biomechanical consideration with FPD?

Longer spans are less rigid


What can be done to increase the rigidity of FPD?

Increase pontic occlusal-gingival dimension or create out of higher yield alloy


Dislodging forces on and FPD work in which direction?



What can be used to reinforce a long span or an unfavorable crown to root ratio on an abutment tooth?

Secondary abutment = double abutments


Which teeth are more retentive: tall or short teeth?

Tall, e.g. PM > M (whatever that means)


What is a common problem when replacing all four maxillary incisors?

Pontics lie outside interabutment axis line and create torque on abutments


How far must secondary retention be on an anterior FPD to counteract the tourquing?

Secondary abutments must be the same distance posterior of the abutment axis line as the pontics are anterior of the interabutment axis line


When would a pier abutment occur?

Edentulous space occurring on both sides of a tooth


What is a means to get around from a pier abutment acting as a fulcrum for movement of a nFPD?

Use a nonrigid connector for the pontic to retainer, usually placed on the middle abutment. Book example is a T-link


What is the term for a FPD with an abutment or abutments at one end only. They should usually only replace one tooth and have 2 abutment teeth.

Cantilever FPD


What is the treatment of choice when an abutment molar is tilted?

Orthodontic uprighting


What are 4 things that can be done if an abutment molar is tilted and cannot be uprighted via ortho?

1. Recontour M surface of 3rd molar to allow path of insertion onto the 2nd molar abutment
2. Proximal 1⁄2 crown on distal(tilted) abutment
3. Telescoping crown on distal(tilted) abutment
4. Nonrigid connector on mesial abutment tooth (premolar)


What is the maximum number of posterior teeth that can be safely replaced with an FPD?



What are the 3 Purposes of Prosthodontic treatment?

1. Eliminate pain
2. Stop progression of disease(perio and caries)
3. Restore function and quality of life


What is the primary cause of FPD failure?



What are the components of diagnostic data collection?

1. Pt interview/history
2. Clinical exam to include TMJ/occlusion X-rays, Diagnostic Casts


What are 6 health findings that can affect dental treatment?

1. Allergies
2. Cardiac problems, e.g. HTN (Epi concern)
3. Prosthetic heart valves (premed concern) 4. Epilepsy (length of appt consideration)
5. Diabetes (possible periodontal disease susceptible)
6. Xerostomia (increased caries risk)


What are the 6 components of an intraoral exam?

1. Oral hygiene
2. Periodontal health
3. Edentulous ridge/abutment teeth health
4. Existing caries, decalcifications
5. Previous restoration and Pros health
6. Occlusion


What do acceptable full mouth radiographs indicate for treatment planning?

1. Interproximal caries
2. PA lesions
3. Previous Endo
4. Alveolar bone levels
5. C:R ratio
6. Root Morphology
7. PDL width
8. Correlate clinical findings


What are 2 types of retainers for FPD?

1. Resin Bonded (good health, young pt)
2. Metal Ceramic (crowns)


What are some important criteria to consider when evaluating an abutment?

1. C:R (2:3 optimal, 1:1 minimum)
2. Root configuration (want it wide)
3. PDL sound
4. Ante’s Law: root surface area of abutment teeth > length of abutments