s10-finals-Treatment Planning for Tooth Replacement

Question 1

What is the primary goal of treatment planning for missing teeth?

Answer 1

To restore dentition functionally and esthetically while ensuring long-term success.

Question 2

Why is patient communication critical before irreversible procedures?

Answer 2

To explain their dental condition, treatment sequence, costs, and required cooperation.

CCCS

Question 3

What is the “Concept of Treatment Simplification”?

Answer 3

Prioritizing simpler, less invasive options (e.g., removable over fixed) if they meet patient needs.

Question 4

When is a removable partial denture considered a compromise?

Answer 4

When replacing a single missing tooth.

Question 5

Name two types of tooth-supported fixed partial dentures.

Answer 5

Conventional fixed prosthesis and resin-bonded fixed prosthesis.

Question 6

What distinguishes an implant-supported FPD from a tooth-supported one?

Answer 6

It relies on osseointegrated implants rather than natural teeth for support.

Question 7

List three limitations of removable prostheses.

Answer 7

Less stability, potential for tissue irritation, compromised esthetics.

Question 8

What is a key advantage of resin-bonded FPDs?

Answer 8

Minimal tooth preparation compared to conventional FPDs.

Question 9

Why is oral hygiene crucial for fixed prostheses?

Answer 9

Poor hygiene leads to periodontal disease, compromising abutment teeth and prosthesis longevity.

Question 10

Define “biomechanical considerations” in prosthesis selection.

Answer 10

Evaluating forces, stresses, and structural integrity of the prosthesis and supporting tissues.

Question 11

What determines the decision to extract a questionable tooth?

Answer 11

Weighing prognosis: if retaining it risks failure, extraction is preferred.

Question 12

What would an edentulous span with no distal abutment likely to require?

Answer 12

A removable partial denture or implant-supported FPD.

Question 13

Why are long-span FPDs prone to failure?

Answer 13

Excessive flexing under load, leading to fractures, loosening, or soft tissue damage.

Question 14

How does span length affect bridge flexing?

Answer 14

Flexing increases with the cube of the span length (e.g., 3x length = 27x flexing).

Question 15

What clinical issues arise from bridge flexing?

Answer 15

Porcelain fracture, connector breakage, retainer loosening, soft tissue inflammation.

Question 16

What are alternatives to a long-span tooth-supported FPD?

Answer 16

Implant-supported FPD or removable partial denture.

Question 17

How does arch curvature influence anterior FPD design?

Answer 17

Pontics outside the inter-abutment axis create leverage, requiring compensatory design.

Question 18

What is the ideal crown-to-root ratio for abutments?

Answer 18

2:3 (crown length : root length).

Question 19

What is the minimum acceptable crown-to-root ratio?

Answer 19

1:1, under strict conditions (healthy periodontium, favorable occlusion).

Question 20

How does root shape affect abutment suitability?

Answer 20

Broad, divergent roots (e.g., molars) provide better support than circular roots.

Question 21

What is Ante’s Law?

Answer 21

The root surface area of abutments should equal or exceed that of the replaced teeth.

Question 22

When is an endodontically treated tooth a viable abutment?

Answer 22

If asymptomatic, well-sealed, and restored with a post/core and full-coverage crown.

Question 23

What contraindicates using a tooth with Grade 3 mobility as an abutment?

Answer 23

Excessive movement compromises stability; FPDs require firm support.

Question 24

How are over-erupted teeth managed before prostheses?

Answer 24

Adjusting occlusal plane via enameloplasty, restorations, or intentional endodontics.

Question 25

Why are short clinical crowns challenging for FPDs?

Answer 25

Limited retention; requires added features (grooves, full coverage, secondary abutments).

Question 26

What is the significance of a broad, flat ridge for implant-supported FPDs?

Answer 26

Ensures adequate bone volume and stability for implant placement.

Question 27

What are the requirements for using a cantilever FPD to replace a maxillary lateral incisor?

Answer 27

Single canine abutment with favorable root length, minimal pontic occlusion, and palatal rest on central incisor.

Question 28

Why is a non-rigid connector used in pier abutment cases?

Answer 28

To isolate stresses to one segment, preventing failure from differential tooth movement.

Question 29

What is a contraindication for non-rigid connectors in posterior FPDs?

Answer 29

Abutment mobility exceeding Grade II.

Question 30

How does a telescopic crown address a mesially tilted molar?

Answer 30

Allows separate coping and crown to align the path of insertion.

Question 31

What is the primary risk of using secondary abutments in FPDs?

Answer 31

Tensile forces on retainers leading to cement failure or recurrent caries.

Question 32

What design feature minimizes bending in long-span FPDs?

Answer 32

Pontics and connectors with greater occluso-gingival dimension.

Question 33

Why are full-coverage retainers mandatory for endodontically treated abutments?

Answer 33

To protect remaining tooth structure and improve retention.

Question 34

What is the risk of restoring a canine with a three-unit FPD?

Answer 34

High lateral forces due to pontic position outside the inter-abutment axis.

Question 35

How does occlusal reduction differ for short-crown abutments?

Answer 35

Prepares teeth for metal-occlusal retainers to avoid excessive shortening.

Question 36

What is the purpose of adding grooves during preparation of short crowns?

Answer 36

To enhance retention and resistance form.

Question 37

Why is orthodontic uprighting preferred for tilted molars?

Answer 37

Achieves parallel paths of insertion without compromising tooth structure.

Question 38

What is the clinical implication of Ante’s Law for a four-unit FPD replacing two molars?

Answer 38

Combined root surface area of abutments must equal or exceed that of replaced teeth.

Question 39

Why are endodontically treated teeth avoided as distal abutments in cantilever FPDs?

Answer 39

Higher risk of root fracture under lever forces.

Question 40

What is the minimum number of abutments for a cantilever FPD replacing one premolar?

Answer 40

Two abutments (e.g., second premolar and first molar).

Question 41

How does pontic size affect stress in a cantilever FPD replacing a molar?

Answer 41

Smaller pontic (premolar-sized) reduces leverage and stress on abutments.

Question 42

What occlusal adjustment is critical for cantilever FPDs?

Answer 42

Eliminating excursive contacts on the pontic.

Question 43

Why are resin-bonded FPDs less suitable for long spans?

Answer 43

Limited retention and higher risk of debonding under functional loads.

Question 44

What is the role of diagnostic casts in evaluating over-erupted teeth?

Answer 44

To measure the extent of eruption and plan occlusal adjustments.

Question 45

What is the consequence of a pier abutment acting as a fulcrum?

Answer 45

Forces concentrate on terminal retainers, risking loosening or fracture.

Question 46

Why are divergent roots advantageous for abutments?

Answer 46

Provide greater periodontal support and resistance to lateral forces.

Question 47

How does periodontal ligament surface area influence abutment selection?

Answer 47

Larger surface area distributes occlusal forces more effectively.

Question 48

What is the prognosis for FPDs in patients with poor oral hygiene?

Answer 48

Poor; high risk of periodontal failure and secondary caries.

Question 49

What is the primary drawback of a removable partial denture?

Answer 49

Reduced stability and comfort compared to fixed options.

Question 50

Why is patient motivation critical for fixed prostheses?

Answer 50

Long-term success depends on consistent oral hygiene and maintenance.

Question 51

Why is replacing a maxillary canine with an FPD particularly challenging?

Answer 51

High lateral forces due to the pontic lying outside the inter-abutment axis.

Question 52

What occlusal scheme is recommended for canine replacement FPDs?

Answer 52

Group function occlusion to distribute lateral forces.

Question 53

Why are cantilever FPDs contraindicated for canine replacement?

Answer 53

Risk of excessive lateral stress leading to abutment failure.

Question 54

What ethical principle is prioritized when discussing treatment options?

Answer 54

Informed consent and transparent communication of risks/benefits.

Question 55

How does Ante’s Law apply to replacing three missing teeth?

Answer 55

Abutments’ combined root surface area must equal or exceed that of the replaced teeth.

Question 56

What is a key risk of using a three-unit FPD to replace a mandibular canine?

Answer 56

Lingual-directed forces may destabilize the pontic.

Question 57

Why is a diagnostic wax-up critical for diastema cases?

Answer 57

To plan pontic size and ensure esthetic alignment.

Question 58

What design feature reduces stress in a canine replacement FPD?

Answer 58

Including an additional abutment (e.g., central incisor) for support.

Question 59

Why are implants preferred over FPDs for canine replacement?

Answer 59

Avoids preparing adjacent teeth and better handles lateral forces.

Question 60

What is the primary cause of failure in long-span FPDs?

Answer 60

Excessive flexure under load, leading to fractures or debonding.

Question 61

How does a non-rigid connector mitigate stress in pier abutment cases?

Answer 61

Allows independent movement of segments, reducing torque on abutments.

Question 62

What is a critical requirement for secondary abutments?

Answer 62

Equal or greater retention and root surface area compared to primary abutments.

Question 63

Why is a cantilever FPD replacing a molar kept premolar-sized?

Answer 63

Minimizes leverage forces on the abutment.

Question 64

What is the consequence of poor embrasure design in multi-abutment FPDs?

Answer 64

Plaque accumulation, leading to periodontal disease or caries.

Question 65

How does root divergence improve abutment suitability?

Answer 65

Enhances periodontal support and resistance to tipping.

Question 66

What is the role of intentional endodontics in managing over-erupted teeth?

Answer 66

Permits sufficient coronal reduction to restore occlusal plane.

Question 67

Why are resin-bonded FPDs avoided in bruxism patients?

Answer 67

Debonding risk due to high occlusal forces.

Question 68

What is the minimum root surface area required for a single-tooth FPD?

Answer 68

Equal to or greater than the replaced tooth (Ante’s Law).

Question 69

Why are Grade 2 mobility cases evaluated case-by-case?

Answer 69

Stability depends on bone support, occlusion, and span length.

Question 70

What is the primary risk of using a pier abutment without a non-rigid connector?

Answer 70

Stress concentration causing cement failure or abutment fracture.

Question 71

How does a full-coverage retainer protect an endodontically treated tooth?

Answer 71

Reinforces remaining structure and prevents fracture.

Question 72

Why are tilted molars problematic for FPDs?

Answer 72

Non-parallel paths of insertion complicate prosthesis seating.

Question 73

What is the purpose of a palatal rest in a maxillary lateral incisor FPD?

Answer 73

Distributes occlusal forces to prevent pontic displacement.

Question 74

How does a non-rigid connector’s location affect function?

Answer 74

Placed distally to prevent unseating during mesial tooth movement.

Question 75

What contraindicates a cantilever FPD for a mandibular first molar?

Answer 75

Lack of distal abutment and high masticatory forces.