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Anterior Guidance

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To Understand Anterior GuidanceIt is First Necessary to understand

Posterior Guidance

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Posterior GuidanceGuidance of the Mandibleas dictated by the Anatomy

of the Temporomandibular Joint

Posterior Guidance

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Anterior GuidanceGuidance of the Mandibleas dictated by the Contacts

of the Teeth

Guidance can be on Any Teeth

Anterior Guidance

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Anterior GuidanceRefers to Guidance by Teeth

as distinct from Guidance due to the Temporomandibular Joint

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Anterior Guidanceis not Necessarily on Anterior Teeth

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Anterior Guidance depends on • The Positioning of Teeth within the

Arch• Irregularities of Teeth • The Arch Relationships

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Anterior Guidance is affected by

• The Patient’s Arch Relationship• The Degree of Overbite • The Degree of Overjet

Protrusive Movements

Protrusive Movementsas determined

by Arch Relationships

Class 1 Jaw Relationship

When the Lower First Molars are Slightly Distal to the Upper First Molars

Guidance is on Front Teeth

Guidance is on Front Teeth

Guidance is on Front Teeth

Guidance is on Front Teeth

Class 11 Division 1

When the Lower First Molars are More Distal to the Upper First Molar Teeth

The Overjet

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The Greater the OverjetThe Flatter the Anterior Guidance

and the Lesser the Degree of Separation of the Back Teeth

Guidance is on Posterior Teeth to start with

Guidance is on Posterior Teeth to start with

Guidance may possibly end up on the Front Teeth

Guidance may possibly end up on the Front Teeth

Class 11 Division 2

When the Lower First Molars are More Distal to the Upper First Molar Teeth

and the Upper Incisors are inclined Backwards

The Overbite

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The Greater the Overbite The Steeper the Anterior Guidance

and the Greater the Degree of Separation of the Back Teeth

Guidance is Immediately on the Front Teeth

Guidance is Immediately on the Front Teeth

Guidance is Immediately on the Front Teeth

Class 111 Jaw Classification

When the Lower First Molars are Mesial to the Upper First Molar Teeth

Guidance can Never be on the Front Teeth

Guidance is always on Posterior Teeth

Guidance is always on Posterior Teeth

Guidance is always on Posterior Teeth

Anterior Guidance

Centric Occlusion

This is the Right Sideof the Mouth

Moving to the Right

Moving to the Right

This is a Functional Movement

If Red Articulating Silk is placed between the Teeth

and the Patient Moves in Right Lateral Movement

The Anterior Guidancecan be studied

This is Canine Guidance

Studying another Patient

Canine/First Premolar Guidance

Studying another Patient

Canine/First and Second Premolar

Studying another Patient

Canine/First and Second Premolar and First Molar Guidance

otherwise known as Group Function

Group FunctionSeparation of the Group of Teeth

by Several Teethpreferably further forward

Uses of Group Function• When it is already present

and there are no adverse effects present

• When Distribution of Excursive Stresses is advisable

Such as• Presence of Bone Loss around Teeth• Extensively Restored Teeth• Loss of Bony Support around

Canine Tooth

• Presence of Canine Wear• Presence of Anterior Porcelain

Crowns

First and Second Premolar Guidance

If the Canine is Outstanding this Guidance may be Necessary

Satisfactory if both Teeth are involved in the Guidance

Second Premolar, First and Second Molar Guidance

Satisfactory if Teeth further forwards are Loose

May occur in Class 11 Division 1 and Classs III Jaw Relationships

If the Canine is Loose

The Posterior Contact may be useful

If the Canine has Good Bone Supportthis Contact is an Interference

In Most Situations this would be considered an Interference

In Most Situations this would be considered an Interference

Reducing This Contact allows Guidance on Teeth further forward

Class 11 Division 1 Arch Relationship

Class 11 Division 2 Arch Relationship

Class 111 Arch Relationship

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Anterior GuidanceIncisal Edge Contacts

Protrusive Edge to Edge Contacts

Two Upper Centrals in Contact with Four Lower Incisors

Lateral Edge to Edge Contacts

Lateral Protrusive Contacts

Between Protrusive and Lateral

The Cross-over Position

After the Canines have crossed over each other in a Lateral Movement

Canine Guidance

Canine/First PremolarGuidance

Canine/First and Second Premolar

Guidance

Canine/First/Second Premolar and First Molar Guidance

Otherwise known as Group Function

First and Second Premolar Guidance

ProtrusiveMovements

Guidance on onlyOne Central Incisor

Reduce Contact to bring more Teeth into

contact

OveruptedLower Incisor

Reduce the Tip

This may bring More Teeth into contact

Reducing these Contacts

may bring More Teeth into contact

The EndThe End