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DA chapter 9

Chapter 9 Tooth morphology study guide.

QuestionAnswer
True or False the anterior sextant is made from the six front teeth? True ( canine to canine ).
True or False a developmental groove that has an imperfect union where the lobes join Is called a fissure? True.
True or False a convex surface means that the surface is recessed? False. ( convex means to bulge or curve outward ).
Recessed means? Concave.
The surface toward the midline is? Mesial.
The surface away from the midline is? Distal.
The anatomical crown is the portion of the tooth that is covered with? Enamel.
The anatomical root is the portion of the tooth that is covered with? Cementum.
The primary first molar is replaced by an adult what? Premolar.
What teeth are used to pulverize food? Premolar.
Canine/cuspids are used for? Tearing food.
Molars are used for? Chewing food.
The centrals are used for? Cutting or biting food.
What teeth are the furthest from the midline? wisdom teeth/ third molars.
There are how many posterior sextants in each arch? Two. ( each arch has 1 anterior and 2 posterior ).
The upper arch is known as? The maxillary.
The division between two equal halves is known as? The midline.
The lower arch is known as? The mandibular.
One-fourth of the complete dentition is known as? A quadrant.
What are the surfaces of the tooth which are next to the neighboring tooth in the same arch? Proximal.
What is it called when the relationship of the teeth meet in normal contact? Occlusion.
What terms refer to the surfaces of either the anterior or posterior that are toward the lip or cheek? Buccal/Labial/Facial.
What term means without teeth? Edentulous.
What is the stage when the child still has some of his primary teeth and already has some of his permanent teeth? Mixed dentition. (6-12 yrs)
Toward the lips or cheeks? Facial.
Incisal edge means? Cutting edge of an anterior tooth.
Lingual means? Refers to the tongue, or toward the tongue.
Occlusal means? A broad chewing surface of the posterior teeth.
The study of the structure and form of teeth? Tooth morphology.
Primary teeth ( deciduous ) have a total of how many teeth? 20 / best guide for an erupting permanent tooth.
Succedanous teeth are? permanent teeth that replace primary teeth.
Posterior teeth are? Toward the back / premolars and molars.
Primary dentition occurs when? 6 months to 3 years.
Permanent dentition occurs when? by age 17 (1st molars are usually first to erupt do not replace a primary tooth).
Area where proximal sides of two teeth come together and touch? Contact area.
Triangular space in gingival direction, occurs when two adjoining teeth are contacting? Embrasure.
At or near the end of the root. Apex.
Opening at the end of tooth through which nerve/blood vessels enter? Apical foramen.
Linear depression forming a groove that extends from middle of buccal surface to occlusal surface? Buccal groove.
Convex area on lingual surface of anterior teeth, near the gingiva? Cingulum.
Pointed/rounded mound on crown? Cusps.
Dividing point of a multirooted tooth? Furcation.
Separate divisions that come together to form a tooth, Often lobes become cusp in molars? Lobes.
Elevated area of enamel that forms the mesial and distal borders? Marginal ridges.
Shallow/rounded/angular depression. Fossa/canine cuspid.
Three bulges on the incisal edge of newly erupted central incisor; normally disappear with normal wear and tear? Mamelons.
Elevated area of enamel that extends obliquely across the occlusal? Oblique ridges.
Place where grooves come together or the fissures cross, decay often begins here? Pits.
Shallow, linear groove that radiates from the developmental groove, wrinkled look? Supplemental groove.
Ridge/elevation that descends from the cusp and widens as it runs down? Triangular ridge.
Linear elevation of enamel? Ridge.
Union of two triangular ridges that produces a single ridge of elevation across the occlusal surface? Transverse ridge.
Where there are three roots coming up from main trunk of tooth? Trifurcated root.
Where there a two roots coming up from main trunk of tooth? Bifrucated root.
Important for appearance and speech? Maxillary central incisor.
cornerstone of the mouth? Maxillary canine.
Resembles the 1st premolar, has 1 root. Maxillary second premolar (bicuspid).
Smallest maxillary tooth, resembles central, distal incisal angle more rounded, anomalies- peg lateral, agenesis. Maxillary lateral incisor.
Has two cusps, bifurcated root, occlusal, often considered for removal if teeth are overcrowded? Maxillary first premolar. (bicuspid).
Has five cusps, trifurcated root, buccal and lingual grooves, buccal and lingual pits, occlusal? Maxillary first molar. (six year molar).
Smaller than 1st, four cusps, trifurcated root, occlusal? Maxillary second molar. (Twelve year Molar)
Smallest in the dentition? Mandibular central incisor.
Resembles maxillary cuspid, longest tooth in mandibular arch? Mandibular canine.
Smaller than 2nd? Maxillary third molar.(wisdom tooth).
Resembles central only larger, distal incisal edge is rounded slightly? Mandibular lateral incisor.
Two cusps, one root, occlusal? Mandibular first premolar. (bicuspid).
Largest and strongest tooth of the mandibular? Mandibular first molar.
Compared to permanent teeth: Less enamel, pulp is larger(care needs to be taken when polishing not to overheat the tooth), crown is shorter, roots are longer and spread wider? (maxillary is A-J mandibular are k-t) Primary teeth.
Delicate in form, mesial and distal marginal ridges less pronounced than those of maxillary? Mandibular deciduous canine.
Resembles permanent mandibular first molar but smaller in all dimensions? Mandibular deciduous second molar.
Does not resemble any other permanent or tooth? Mandibular deciduous first molar.
What happens to the root when primary tooth is loosened? Evanesce.
Created by: zckmyrs85
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