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DA chapter 9
Chapter 9 Tooth morphology study guide.
| Question | Answer |
|---|---|
| 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. |
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zckmyrs85
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