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TEETH(PREMOLARS,CANINES,INCISORS,MOLARS)




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Semanoor15
لإنضمامl: 9th February 2010
الوسائط: 12713

Painting of Teeth(premolars,canines,incisors,molars):We recognize four basic kinds of teeth in an individual's jaw, the incisors, canines, premolars, and molars.Incisors : these teeth are the first permanent teeth to erupt that replace a deciduous tooth. They have straight biting edges, a flat front surface and a single root. The shape of these teeth is useful for cutting through food. Central Incisors : these teeth butt up against the midline of the mouth, making them the center-most teeth. Upper central incisors are larger than upper lateral incisors. Lower central incisors are the smallest teeth in the mouth. Lateral Incisors : the second teeth from the midline. Upper lateral incisors look like upper central incisors but are smaller in size. Lower lateral incisors are slightly larger than lower central incisors. Canines : the third tooth from the midline. These teeth are also known as eye teeth and cuspids. Their biting edge is composed of a single large cusp that is suited for both seizing and holding food as well as cutting and tearing it. Canines have a single root. These teeth are the longest teeth in their respective jaws, the upper canine being the longest tooth in the mouth. Premolars : these teeth are also known as bicuspids. They have a shape that is useful for both cutting and tearing as well as crushing food. First Premolars : the fourth tooth from the midline in each quadrant. Upper first premolars have two distinct cusps and have either one or two roots. Lower first premolars are the smallest type of premolar. They have one root, a prominent cheek-side cusp and a less pronounced tongue-side cusp. Second Premolars : the fifth tooth from the midline. Second premolars have one root. Upper second premolars have two distinct cusps. Lower second premolars have a single cheek-side cusp and either one or two less pronounced tongue-side cusps. Molars : these teeth have broad surfaces that are used to crush and grind food. They have four or five distinct cusps, however, the cusps are shorter and more blunted that those found on other cusped teeth. First Molars : the sixth tooth from the midline in each quadrant. Another term for these teeth is "six-year molars" since they usually come in at age six years. These teeth are the first permanent ones to come in that do not replace a deciduous tooth. Upper first molars have four (or possibly five) prominant cusps and three roots. Lower first molars have five cusps and only two roots. (F) Second Molars : the seventh tooth from midline. Another term for these teeth is "twelve-year molars" since they usually come in at age twelve years. Upper second molars have four cusps and three roots. Lower second molars have four cusps and two roots. Second molars are usually slightly smaller in size than first molars. (G) Third Molars : the eighth tooth from the midline. Another term for these teeth is the "wisdom teeth." Upper third molars have four cusps and three roots. Lower third molars have four cusps and two roots. The roots of third molars are often fused together, at least somewhat. Third molars are usually smaller in size than second molars. (H)

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لإضافةl: 2nd October 2009
المشاهدات: 3616

Category: Semaedu / Images
السمات: premolars canines incisors molars Teeth types of teeth


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