FPD

Clinical considerations in Fixed partial denture

Dr. Ahmed Jawad
معالجة اسنان \ المرحلة الخامسةالمحاضرة (2)

HISTORY

1. Personal details
Patient's name
Address
Phone number
Gender

Occupation

Work schedule
Marital and financial status
Include all relevant information concerning the reasons for seeking treatment, along with any personal information, including relevant previous medical and dental experiences.

2. Chief complaint:

Chief complaints usually fall into one of the following four categories:
Comfort (pain, sensitivity, swelling)
Function (difficulty in mastication or speech)
Social (bad taste or odor)
Appearance (fractured or unattractive teeth or restorations, discoloration)


• Medical history
• Conditions affecting the treatment methodology (e.G., Any disorders that necessitate the use of antibiotic premedication, any use of steroids or anticoagulants, and any previous allergic responses to medication or dental materials).
• Conditions affecting the treatment plan (e.G., Previous radiation therapy, hemorrhagic disorders, extremes of age, and terminal illness).

3. Systemic conditions with oral manifestations for example, periodontitis may be modified by diabetes, menopause, pregnancy, or the use of anticonvulsant drugs , in cases of hiatal hernia, bulimia, or anorexia nervosa, teeth may be eroded by regurgitated stomach acid..
4. Possible risk factors to the dentist and auxiliary personnel (e.G., Patients who are suspected or confirmed carriers of hepatitis B, acquired immunodeficiency syndrome, or syphilis).

4. Dental history

Periodontal history, restorative history, endodontic history, orthodontic history, removable prosthodontic history, oral surgery history, radiographic history, TMJ dysfunction history

EXAMINATION

DIAGNOSIS
A typical diagnosis will condense the information obtained during the clinical history taking and examination.
• General and local factors, varies from patient to patient.
PROGNOSIS

Factors Influencing Fixed Bridge Design

1. Crown Length
Teeth must have adequate occlusocervical crown length to achieve sufficient retention

2. Crown Form

Some teeth have tapered crown form which interferes with parallelism

Incisors possessing very thin highly translucent incisal edges

3. Degree of Mutilation

Size, number and location of carious lesions or restorations affect whether full or partial coverage retainers are indicated

Fractured or carious teeth not restorable should be removed thereby altering design and creating the need for a prosthesis

4. Root Length and Form

Roots with parallel sides and developmental depressions are better able to resist additional occlusal forces than are smooth-sided conical roots
Multirooted teeth generally provide greater stability than single-rooted teeth
Longer root has better retention than short root


5. Crown-Root Ratio

1:1.5 ratio has been generally acceptable whereas 1:1 ratio is considered minimal and requires consideration of other factors (ex. # Of tooth being replaced, tooth mobility, periodontal health) before it can be used as an abutment

6. Ante’s Law

Periodontal ligament area/pericemental area of the abutment teeth should be equal or greater than the periodontal ligament area/pericemental area of the missing tooth/teeth
1

7. Periodontal Health

Absence of any form of periodontal disease such as bone resorption and gingival recession




8. Mobility

Miller mobility value

• 1o mobility – normal
• 2o mobility – still acceptable provided that you must know the factor that cause the mobility (patient age, presence of calcular deposit) and consider the # of tooth being replaced
• 3o mobility – can not be used as an abutment.

9. Span Length

Distance between abutments affects the feasibility of placing fixed prosthesis
Ideal for 1-2 missing tooth
Loss of 3 adjacent tooth requires careful evaluation of other factors (crown-root ratio, root length and form, periodontal health, mobility)

Primary abutment

Secondary
abutment


10. Axial Alignment

Crowns of proposed abutments must be well aligned

Minor alterations in axial alignment (tipped/rotated) often necessitate the use of full coverage crowns to achieve retention or acceptable esthetics

11. Arch Form

fulcrum line
fulcrum line
lever
lever

counter-balancing

12. Occlusion

Occlusal forces brought to bear on a prostheses are related to the following factors:

A. Degree of muscular activity
B. Patients habit
C. # Of tooth being replaced
D. Leverage on the bridge
E. Adequacy of bone support



13. Pulpal Health

Abutment/s should not be sensitive to percussion or vitality testing (normal response)

Abutments with poor pulpal health should undergo endodontic treatment prior to tooth preparation

14. Alveolar Ridge Form

Not indicated for FPD if there is considerable bone loss

Vertical bone loss

Horizontal bone loss

15. Age of Patien

Not indicated in older patient as well as adolescents when teeth are not fully erupted or with large pulps

16. Phonetics

Patients prefer FPD for good phonation (provides sufficient resistance to the flow of air to allow normal speech sounds to be produced) rather than RPD

17. Long-Term Abutment Prognosis

Take note of the oral hygiene
If there is question on the ability of the remaining supporting structure to accept additional occlusal forces, RPD is indicated
Tooth with sufficient loss of periodontal support and questionable prognosis may be best treated with an RPD rather than an FPD

18. Esthetics

Prefer FPD because it resembles natural tooth
But RPD may be indicated when the use of a pontic produces large and unsightly proximal embrasures in a fixed prostheses.

19. Psychological Factors

To most patients an FPD feels more normal than an RPD and more quickly becomes an accepted part of the oral environment
Patients feels more confident and looks good wearing FPD than RPD