shape plays an important part of function with the teeth. what are 4 components of shape and function?
- speech, jaw function
- arch form
- temporomandibular joint function
- integration of form, function, and esthetics
form has to do with the biomechanical contributions in maintaining _____
"form follows function" is a relationship between esthetics and optimal occlusion. what are 2 components of esthetics and optimal occlusion?
- physical forces and periodontal ligament
- TMJ function
what is the significance of the curve of spee in relation to "form follows function"?
proper articulation of teeth
what is the definition of contact areas?
proximal heights of contour of the mesial or distal surface of the tooth that touches its adjacent tooth in the same arch
T or F:
proximal contact areas are points, not areas
they are areas, not points
can excess occlusal forces result in loss of supporting tissues?
proper proximal contact areas prevent food from packing between the teeth, which may become ______
proper proximal contact areas provide _____ for arch
proper proximal contact areas must be observed from which 2 views?
facial and occlusal
proper proximal contact areas provide support for all teeth with the exception of which?
distal of 3rd molars
____ and ____ do not drift distally due to angulation of occlusal surfaces and roots
2nd and 3rd molars
pathologic conditions resulting from lack of proper proximal contact areas include what?
- bone loss with attachment loss (periodontitis)
what is the point contact?
- initially, as teeth erupt, the teeth contact each other at a specific point (the point contact)
- with the passage of time, physiologic tooth movement causes frictional wear enlarging the contact point to the contact area
proper contact preserves the ____ and ____ of the arch by maintaining normal mesiodistal relationship of teeth
stability and integrity
proper contact prevents food impaction _____
proper contact protects the soft tissue from ______
proper contact conserves the teeth from ____
premature restorative failure does not occur if ____ ____ ____ is present
stable proximal contact
interproximal spaces are ____ in shape to allow for ____ _____.
- gingival papillae
in interproximal spaces, the base of the triangle is the ____ and the apex is the _____
- alveolar process
- contact area
T or F:
size and shape of interproximal spaces vary with individual teeth
normally, there will be ____ between CEJ and crest of alveolar bone
T or F:
surface keratinization and dense elastic fibers maintain ginngival tissues form more trauma from mastication and bacterial invasion
____ of the teeth at the cervix and ____ of roots allow for the proper anchoring of the teeth and tissues
what are embrasures?
curvatures adjacent to the contact areas
what are the 5 types of embrasures?
- labial interproximal
- buccal interproximal
- lingual interproximal
identify the following 3 structures
what is the definition of contours?
denotes some degree of convexities and concavities on the facial/buccal and lingual surfaces of all the teeth that affords protection to the supporting tissues during mastication
buccal and lingual contours _____ food away from _____ during mastication
- gingival margins
the height of contour of the facial surface is where?
cervical 1/3 of all teeth
the height of contour of the lingual surface is where?
- cervical 1/3 of incisors and canines
- middle 1/3 of premolars and molars
under-contouring can lead to ____
what are 3 main types of contours?
- faciolingual contour
- proximal contour
- occlusal contour
what is the result of over-contouring restorations?
deflection of food away from the gingiva, causing poor gingival stimulation
what is the height of epithelial attachment?
curves of the cervical lines
epithelial attachment seals the ____ of the tooth
T or F:
height of epithelial attachment can be adjusted to different conditions and changes
height of epithelial attachment is vulnerable to ____ caused mostly by careless treatment
injury to height of epithelial attachment can create an ongoing pathologic condition of what?
height of the gingival tissue _____ and ____ is directly related to the height of attachment
mesially and distally
normal height of epithelial attachment follows the _____, assuming ____
curvature of the cervical line, assuming normal tooth alignment and contact with other teeth
extent of curvature of cervical line depends on _____ above the crown cervix
height of contact area
extent of curvature of cervical line depends on the ___ and ___ of the crown labiolingually and buccolingually
size and diameter
posterior teeth have ____ accentuated cervical line curves
what is the location of contact in anterior teeth?
what is the location of contact in posterior teeth?
junction of incisal and middle 1/3
teeth show convexities on the ___ and ___ surfaces
distal and mesial
the area with maximal convexity on the proximal surface is called the _____
proximal height of contour
the proximal height of contour is responsible for the creation of what?
- proximal contact
- embrasure space
what 2 ways does tooth form relates to the form of supporting structures?
- food impaction
- trauma to gingival tissues
what are the 5 considerations of fundamental curvatures related to restorations?