Orofacial Complex Form and Funciton

Things that must be considered for form and function of teeth(6)

• Proximal contact areas

• Interproximal spaces

• Embrasures

• Labial and Buccal Contours @ that cervical third

• Lingual Contours at the middle third of crowns

• Curvatures of cervical lines(CEJ) on mesial and distal surfaces

Proximal contact areas over time

Gets bigger over time

Are all proximal contact areas the same size and in the same locations?

no,

they very in size and locations

What teeth are not in contact with 2 meighboors

3rd molar

How do proximal contact areas help protect teeth

help prevent food impaction

help stabilize teeth

provide for proper food flow pattern

How to observe Proximal contact areas

Labial Buccal view = shows position of contact areas cervicoincisally or cervicoocclusally

Incisal / occlusal view= shows position of contact areas labiolingually or buccolingually

Contacts and size as you go from anterior to postierior

contacts become more cervical and size increases

Distal vs mesial contact

on individual tooth distal contact is more cervical than mesial contact

Anterior teeth contacts are centered in a…

centered in a facial/lingual direction

• positioned equidistant from facial and lingual surfaces

Postierior teeth contacts are centered in a…

• NOT DIRECTLY CENTERED

• Located slightly buccal/ facial to center

Interproximal spaces shape and its boundaries? What does this shape effect?

Triangular

• alveolar bone = base of triangle

• Proximal surfaces of adjacent teeth = sides of triangle

• Contact area= apex of triangle

This shape can effect health and stimulation of periodontium

Embrasure spillways purposes (2). How do they diverge?

• spillaway for food during clewing/self cleaning

• prevents food from being forced through contact area

• Diverge facially, lingually, incisally/occlusally,cervically

Are embrasures equal in sized and shape when bisected?

yes

As contact areas become more cervical what happens to occlusal/incisal and cervical embrasures?

Occlusal/lingual embrasures= increase in size

cervical embrasures= decrease in size

As contact areas move more facially (posterior teeth) what happens to the size of the facial and lingual embrasures

Facial embrasures= decrease

Lingual embrasures= increase

Contact form, interproximal spacing, and thev embrasure form are constant in…

Sections!

• max anteiors

• man anterior

• max posterior

• man posterior

Facial/ lingual cervical third contors & Lingual middle thirds contour job?

• prevents food impaction and trauma

  • faulty counters=> food impaction/trauma→ initiates localized inflammatory responses

• soft tissue attached @ cervicial third of crown

cervical height of contour characteristics.

• most of the curvature lies beneath gingival crest

• CEJ may appear as we age/ perio disease

• protective curvatures work when teeth are in alignment

• normal curvature measurement from CEJ to crest of contour is .5mm except on mand posterior about 1.0mm

Epithelial attachment job

seals soft tissue of teeth

How to damage epithelial attachment

probing, scaling, operative work

What is the hight of normal gingival tissue mesially/distally dependent on

The epithelial attachment

How are the cervical line related to crow and interproximal contact areas?

The depth of curvature of the cervical line is related to widths and lengths of the crown and interproximal contact area

Cervical line curvature rules (5)

1. curved to incisal/occlusal on m/d

2. curved toward apical on facial/lingual

3. depth of curveture is greater on mesial than distal

4. cervical lines on approximatig surfaces of adjacent teeth are the same

5. depth greatest on incisors(mesial of centrals) and decrease as move postieriorly

Can tooth form and function lead to perio

yes, and need to note when restoring teeth