PDI Classifications Flashcards

Questions and Answers

What does 'PDI' stand for?

Prosthodontics Diagnostic Index

Who developed the PDI classification system?

American College of Prosthodontics (since 1994)

What are the three parts of the PDI classification system?

Complete edentulism, partial edentulism, completely dentate

What is the purpose of the PDI classification system?

To classify a patient based on their existing clinical conditions Signup and view all the answers

What are the four diagnostic criteria for a completely edentulous patient?

Bone height, residual ridge morphology, muscle attachment, maxillo-mandibular relationship Signup and view all the answers

What are the PDI classifications for completely edentulous patients?

Class I, Class II, Class III, Class IV Signup and view all the answers

What variables can be expected to contribute to increased treatment difficulty?

Conditions requiring pre-prosthetic surgery, limited inter-arch space, tongue anatomy, TMDs, refractory patients Signup and view all the answers

What is the only radiograph type that can measure the vertical bone height of the mandible in a completely edentulous patient?

Panoramic image Signup and view all the answers

When measuring the vertical bone height of the mandible in a panoramic image, where should it be measured?

At the point where there is the least amount of vertical bone height Signup and view all the answers

What is the ideal inter-arch space for a completely edentulous patient?

20 mm Signup and view all the answers

What are the two diagnostic criteria for a completely dentate patient?

Tooth condition, occlusal scheme Signup and view all the answers

What are some other Class IV characteristics for the PDI classification of a completely dentate patient?

Severe manifestations of local or systemic disease, maxillo-mandibular dyskinesia or ataxia, refractory patient Signup and view all the answers

Study Notes

PDI Classification Overview

PDI: Stands for Prosthodontics Diagnostic Index.
Developed by the American College of Prosthodontics in 1994.
Comprised of three main parts: complete edentulism, partial edentulism, and completely dentate.

Purpose and Usage

The PDI classification system helps clinicians assess patients' existing clinical conditions and classify the complexity of their needs.
Classes range from Class I (least complex) to Class IV (most complex).

Complete Edentulism Criteria

Diagnostic criteria for completely edentulous patients include:
- Bone height (Mandible only)
- Residual ridge morphology (Maxilla only)
- Muscle attachment (Mandible only)
- Maxillo-mandibular relationship.

PDI Classes for Complete Edentulism

Class I: Residual bone height of 21 mm or greater.
Class II: Residual bone height of 16 to 20 mm.
Class III: Residual bone height of 11 to 15 mm.
Class IV: Residual bone height of 10 mm or less.

Residual Ridge Morphology - Maxilla

Type A: Ideal conditions with resistance against movement.
Type B: Moderate loss of posterior buccal vestibule but adequate resistance.
Type C: Loss of anterior labial vestibule with minimal resistance to movement.
Type D: Significant loss of vestibules and minimal resistance from palatal vault.

Muscle Attachment Classification

Type B: Mentalis muscle near alveolar crest.
Type C: Both mentalis and genioglossus near alveolar crest.
Type D: Attached mucosal base only in posterior lingual region.

Ideal Parameters

Ideal inter-arch space: Recommended space is 20 mm.

Partial Edentulism Criteria

Evaluated based on:
- Location and extent of edentulous areas.
- Condition of abutment teeth.
- Occlusal scheme.
- Residual ridge anatomy.

PDI Classes for Partial Edentulism

Class I: Ideal or minimally compromised conditions and limited edentulous spans.
Class II: Moderately compromised, confined to a single arch.
Class III: Substantially compromised across bars but maintains abutment support.
Class IV: Severely compromised, with implications like extensive edentulous areas.

Diagnostic Criteria for Completely Dentate Patients

Criteria include tooth condition and occlusal scheme.

PDI Classes for Completely Dentate Patients

Class I: No localized therapy required, minimal defects.
Class II: Moderate deficiencies in tooth structure, requires localized therapy.
Class III: Substantially compromised structure requiring major therapy without changes in occlusal vertical dimension.
Class IV: Severely compromised with major therapy needs and accompanying systemic disease issues.

Additional Considerations

Refractory Patients: Chronic complaints after adequate therapy can indicate more complex classifications.
Systemic Diseases: Severe issues may complicate expected outcomes and treatment efficacy.

Description

Test your knowledge on the Prosthodontics Diagnostic Index (PDI) with these flashcards. This quiz covers key concepts including what PDI stands for, its developer, and the three parts of the classification system. Perfect for students and professionals in prosthodontics.