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23 Cards in this Set
- Front
- Back
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Angle
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Formed by two straight lines that meet at an end point.
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90 degree angle
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Is another term for a right angle. Example the seat of a chair is at a 90 degree angle from the back.
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45 degree angle
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Example if a man is holding his arms at 45 degree angle to the midline of his body..The small triangle between head and one arm.
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Parallel lines
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parallel lines are lines that run in the same direction and never meet or intersect on another
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Perpendicular lines
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Perpendicular lines are two lines that intersect (meet) to form a 90 degree angle
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Shank position
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The shank of this periodontal instrument is positioned parallel to the long axis of the second premolar tooth
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Vertical
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A line going up and down
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Oblique
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neither perpendicular nor parallel to a given line or surface; slanting; sloping.
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horizontal
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A line going across...
Example - a sunset |
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Cross section
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exposed by cutting through an object, usually at right angles to its longest dimension.
Ex - a knife cutting through a pencil |
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hexagonal cross section
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a typical lead pencil is hexagonal in cross section.
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triangular cross section
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The working end of certain periodontal instruments is triangular in cross section.
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Millimeter
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A unit of length equal to one thousandth of a meter or 0.0394
abbr. - mm. |
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Periodontal Probe
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a probe is a periodontal instrument that is similar to a miniature ruler.Marked in mm units.
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Pocket depth
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The depth of a periodontal pocket is measured in mm. Periodontal pockets ar 4mm or greater in depth.
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Long axis
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An imaginary line that passes through the center of a tooth and divides the tooth symmetrically.
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apical direction
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a direction that is moved toward the tooth apex.
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coronal direction
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direction moved toward the tooth crown.
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Midline
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where the crown of an anterior tooth can be divided in half by an imaginary line.with equal halves.
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Line angles
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a line angle is an imaginary line formed where two tooth surfaces meet. Each tooth has 4 line angles.
mesiofacial, distofacial, mesiolingual, distolingual |
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Facial aspect
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where the tooth is subdiveded into three areas.
1.distofacial 2. facial surface 3. mesiofacial. |
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lingual aspect
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Area where a tooth is subdivided into three areas
4. distolingual 5. lingual area 6. mesiolingual area |
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Sextant
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Is for the purpose of identification. each area is called a sextant. there are 6 sextants
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