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Questions and Answers
What shape do the proximal surfaces of anterior teeth generally have?
How does the size of contact areas change from anterior to posterior teeth?
Which of the following is NOT a general rule regarding contact areas?
What happens to the cervicoincisal/occlusal length of teeth as one moves posteriorly in the dental arch?
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In which direction are the anterior contact areas usually centered?
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What is the primary purpose of understanding the general rules related to dentition?
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Which area is considered the interproximal space?
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What is the definition of embrasures in dentistry?
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What is a key function of embrasures during mastication?
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Which of the following correctly distinguishes between a gingival embrasure and a cervical embrasure?
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How many embrasure areas does each tooth have?
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In which direction does a facial embrasure open relative to the contact area?
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Where is the occlusal/incisal embrasure located?
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What happens to incisal/occlusal contact areas as they move from anterior to posterior?
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Which statement about cervical/gingival embrasures is correct?
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How does the size of facial and lingual embrasures compare on anterior teeth?
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Where are the contact areas located on posterior teeth?
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Which statement regarding cervical line curvature is true?
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What is the general depth of curvature on the proximal surface for anterior teeth compared to posterior teeth?
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What is the relationship between the height of the contact area and the depth of curvature on the proximal surface?
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What occurs if a proximal restoration is overcontoured iatrogenically?
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Study Notes
Shapes of Teeth
- Facial and Lingual surfaces are trapezoidal
- Proximal surfaces are also trapezoidal
- Anterior Teeth are Trapezoidal
- Max. Posterior teeth are trapezoidal
- Mand. Posterior teeth are trapezoidal
Proximal Contact Areas
- Contact areas exist where teeth touch in the arch
- They must be small enough to prevent food and bacteria build-up
- They must be large enough to prevent food impaction
- They provide support and anchorage for teeth
Contact Areas: 5 General Rules
- Contact areas become more cervically located from anterior to posterior
- The distal contact area is more cervically located than the mesial
- This is because the crown length decreases from anterior to posterior
- The size of the contact area increases from anterior to posterior
- This is because posterior teeth are wider than anterior teeth
- Anterior contact areas are centered in the faciolingual direction
- Posterior contact areas are located just facial to the center
Why Understand The General Rules?
- They provide the foundation for good form and function
- They are a benchmark to use when examining variations
- They allow you to identify discrepancies and dysfunction in the dentition
- They correlate contacts to the health of the periodontium
- They help understand the importance of proper contacts in restorative dentistry
- They show the challenges associated with abnormal contacts
Interproximal Spaces
- This is the space between the proximal surfaces of two teeth
- In a healthy mouth, the gingiva fills the interproximal space
Interdental Papilla
- This is the gingiva located in the interproximal space
- It should be wider cervically and narrower coronally
- This shape depends on proper contact and alignment
Embrasures
- The spaces formed by the interproximal contours of adjacent teeth
- They are named for their position in relation to the contact area
- There are 4 embrasures for each tooth:
- Facial
- Lingual
- Occlusal/Incisal
- Cervical/Gingival
Embrasures: Facial/Lingual View
- Occlusal/Incisal Embrasure: Located coronally to the contact area
- Cervical/Gingival Embrasure: Located cervically to the contact area
Embrasures: Occlusal/Incisal View
- Facial Embrasure: Located facially to the contact area
- Lingual/Palatal Embrasure: Located lingually to the contact area
Embrasures: 5 General Rules
- Occlusal/Incisal embrasures increase in size from anterior to posterior
- Cervical/Gingival embrasures decrease in size from anterior to posterior
- Facial and lingual embrasures are equal in size in anterior teeth
- Lingual embrasures are larger than facial on posterior teeth
- Embrasures are symmetrical
Cervical Line Curvature
- The cervical line is also known as the Cemento-Enamel Junction (CEJ)
Cervical Line Curvatures: 5 General Rules
- The direction of curvature changes:
- Facial and lingual are curved apically
- Proximal surfaces are curved incisally or occlusally
- The depth of curvature on the proximal surface depends on the height of the contact area and the diameter of the crown
- The depth of curvature on the proximal surface is greater on anterior teeth than posterior teeth
- Cervical lines on the proximal surface are more pronounced on the mesial than the distal
- Variations in cervical line curvature are linked to the degree of proximal contacts, axial inclination, and tooth shape
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Description
This quiz covers the shapes of teeth, specifically focusing on the trapezoidal aspects of different teeth types and their contact areas. It includes the general rules regarding how these contact areas are positioned and sized within the dental arch. Perfect for dental students looking to test their knowledge on dental anatomy.
