TMJ, Principles of Occlusion & Tooth Preparation (Foundational Anatomy)

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TMJ, Principles of Occlusion and Tooth Preparation (Foundational Anatomy)

One. TEMPOROMANDIBULAR JOINT (TMJ)

A. Major Components

· The TMJ is composed of:

· Muscles of mastication (with innervation and vascular supply)

B. Type of Joint

C. Articulating Structures

D. Articular Disk

· Attachments:

E. Retrodiscal Pad (Bilaminar Zone)

F. Synovial Cavities

G. Disk Movement

Two. LIGAMENTS OF THE TMJ

· Three Paired Ligaments:

Functions of Ligaments

· Specific Functions:

Three. MUSCLES RESPONSIBLE FOR MANDIBULAR MOVEMENT

· A. Muscles of Mastication (Primary muscles for chewing and mandibular movement.)

· B. Suprahyoid Muscles (Assist in mandibular movements)

Four. BASIC MOVEMENTS OF THE TMJ

Five. CONNECTION TO PRINCIPLES OF OCCLUSION

Six. CONNECTION TO PRINCIPLES OF TOOTH PREPARATION

MUSCULAR FUNCTION

A. Muscles of Mastication

Two. Lateral Pterygoid Muscle

· Inferior Belly

· Superior Belly

B. Suprahyoid Muscles

Opening Sequence

Stylohyoid Muscle

Two. DENTITION and OCCLUSION

B. Maximum Intercuspation (MI)

C. Functional Cusps

D. Angle Class One Relationship

E. Ideal Overlap

Three. CENTRIC RELATION (CR)

CR versus Maximum Intercuspation (MI)

Four. MANDIBULAR MOVEMENT

One. Rotation

Gliding movement

One. REFERENCE PLANES OF MANDIBULAR MOVEMENT

Two. SAGITTAL PLANE

A. Rotation (Hinge Movement)

Occurs between condyle and articular disk

Three. HORIZONTAL PLANE

A. Lateral Movement

One. Working Side (Laterotrusive) Condyle

Two. Non-Working (Orbiting, Mediotrusive) Condyle

B. Straight Protrusive Movement

Four. FRONTAL PLANE

Five. BORDER MOVEMENTS (Posselt)

A. Protrusive Pathway (From Maximum Intercuspation)

B. Extreme Borders in Posselt Diagram

Six. DETERMINANTS OF MANDIBULAR MOVEMENT

A. Posterior Determinants

B. Anterior Determinants

Effects of Overlap

Seven. Important Concept

Two. CHEWING (MASTICATION)

Important Influences on Chewing

Children versus Adults

Three. SPEAKING (PHONETICS)

Important sounds:

Phonetics helps evaluate:

Four. PARAFUNCTIONAL MOVEMENTS

Effects of Parafunction.

Five. BRUXISM

Prevalence:

Effects of Bruxism.

Six. CLENCHING

Differences from Bruxism.

But may cause:

Seven. PRINCIPLES OF OCCLUSION

B. Centric Relation.

VIII. OCCLUSAL CONCEPTS

Two. Unilaterally Balanced Articulation (Group Function)

Three. Long Centric

Perspective)

Ten. BASIC TMJ REVIEW (Functional View)

MUTUALLY PROTECTED ARTICULATION

One. KEY PRINCIPLES

Two. Posterior Teeth Role

Purpose:

Two. FEATURES OF MUTUALLY PROTECTED OCCLUSION

Three. CONDITIONS REQUIRED

Four. WHY ANTERIOR TEETH PROTECT POSTERIOR TEETH

Why Canines Are Important

Five. ADVANTAGES

Seven. OPTIMUM OCCLUSION PRINCIPLES

Patient Adaptability to Occlusal Abnormalities:

A. Lowered Threshold:

B. Raised Threshold:

Pathogenic Occlusion:

B. Periodontium Signs:

C. Musculature Signs:

D. TMJ Signs:

Occlusal Treatment Indication:

Objectives of Occlusal Treatment:

Short-Term versus Definitive Treatment:

· Deprogramming Devices:

· Occlusal Device Therapy (Splints/Appliances):

● Direct Device Procedure (Vacuum-Formed Matrix):

Indirect Device Procedure (Autopolymerizing Resin):

Indirect Alternative (Heat-Polymerized Resin): ●

Attention to Detail:

· Follow-Up After Delivery:

● Summary Concepts:

Important Points

VIII. HIGH-YIELD QUIZ RECALL

Chapter Seven

· Three main categories of tooth-preparation principles:

Biologic Considerations - Prevention of Damage

Causes of Pulp Injury

Conservation of Tooth Structure

Considerations Affecting Future Dental Health

Unacceptable margins:

Chamfer margin:

Beveled margin:

Shoulder margins:

Sloped shoulder (one hundred twenty degrees):

Beveled shoulder:

Occlusal considerations:

Preventing tooth fracture:

Mechanical considerations

Grooves, boxes, pins

Stress concentration

Type of preparation

Roughness of the fitting surface

Materials being cemented

Type of luting agent

Film thickness of the luting agent

Grooves, boxes, and pins

Type of restoration

Physical properties of the luting agent

Adequate tooth reduction

Partial-coverage restorations

Proximal margins:

Facial margins (maxillary partials):

Diagnostic tooth preparations (on casts):

● Diagnostic waxing procedures:

Evaluative steps during clinical preparation:

● Patient and operator positioning:

PRINCIPLES OF TOOTH PREPARATION

· Factors:

Biological Considerations

One. Adjacent

○ Group function

Two. Periodontal structures

· Overall role in occlusion is:

· Components:

What is the role of PDL in static occlusion?

Function in dynamic occlusion or movement

How does PDL allow slight tooth movement or physiologic mobility?

Alveolar bone

· Components

Four. Muscles of mastication

· Main muscles:

· It includes sensory receptors.

○ Sensory receptors (PDL, muscles, TMJ)

o Central nervous system

Posterior and anterior determinants Posterior

A. Vertical overlap of incisor:

Overview

The document presents a comprehensive analysis of TMJ, detailing its anatomical components, movements, and the implications for occlusion and tooth preparation. It discusses how proper understanding of these elements is crucial for effective dental treatment and patient care.

Key Points

1The TMJ allows both hinge and sliding movements essential for jaw function
2Understanding TMJ is vital for achieving stable occlusion
3Ligaments and muscles govern mandibular movement and joint functionality
4Proper tooth preparation must consider mandibular biomechanics to avoid complications
5Knowledge of occlusal principles is critical for restorative dentistry.

Details

Category: Health and Medicine

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