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Clinical Oral Struct
Clinical Oral Structures, Dental Anatomy and Root Morphology
| Question | Answer |
|---|---|
| At approximately what age will a child’s permanent mandibular central incisors start formation? A. 6 weeks in utero B. at birth C. 3 years D. 6 years | B. The permanent teeth start forming between birth and three years of age, and the mandibular central incisors are one of the first permanent teeth in the developmental sequence or order. |
| The rounded elevations on the incisal edge of permanent incisors are: A. Caused by a developmental disturbance in utero B. Due to trauma to the primary central incisors C. Evidence of lobe development D. Evidence of chewing on hard objects | C. The rounded elevations are mamelons and are evidence of lobe development in the development of teeth. |
| How many molars do you expect to see in a child ? years old? A. 12 B. 10 A. C. 8 D. 4 | A. There should be 12 molars in children approximately seven to eleven years of age: eight primary molars (four first and four second primary molars) and four permanent first molars. |
| A prominent maxillary labial frenum should be watched for possible development of: A. Gingival recession B. Diastema C. Speech defect D. Primate space | B. An overdeveloped and extended maxillary labial frenum may interfere with the development of contact between the maxillary central incisors; the space is called a diastema. |
| A distal step to the terminal plane was recorded in a child’s record at the age of 5. Which of the following in Angle’s Classification of Malocclusion will this most likely lead to ? A. Normal B. Class I C. Class II D. Class III | C. A distal step of the second primary molars in centric occlusion always leads to a Class II or distal occlusion. |
| When initially opening the mouth, both condyles should: A. Move down, forward, and medial B. Move down, forward, and lateral C. Move down and forward D. Rotate in the mandibular fossa | D. During the first 25 mm of opening, the condyles rotate in the mandibular fossa. |
| Which of the following is located in the vestibule? A. Mucobuccal fold B. Palatine raphe C. Plica fimbriatae D. Philtrum | A. The mucobuccal fold is the “gutter-like” area in the vestibule located at the junction of the facial surfaces of the teeth, gingiva, and alveolar mucosa and the lining mucosa of the cheeks and lips. |
| Which of the following frena, if short and taut, may affect an individual’s speech? A. Maxillary labial frenum B. Lingual frenum C. Mandibular labial frenum D. Buccal frena | B. A heavy and tight lingual frenum may interfere with tongue movement and affect speech. |
| How are the sublingual caruncle and parotid papillae alike? A. Both contain duct openings for major salivary glands B. Both are elongated ridges of tissue C. Both are located in the floor of the mouth D. Both contain taste buds | A. The parotid papilla has an opening for the parotid salivary gland and the sublingual caruncle for the submandibular salivary gland; both glands are major salivary glands. |
| Which of the following is the injection site for local anesthesia of the nasopalatine nerve? A. Maxillary labial frenum B. Palatine fovea C. Retromolar area D. Incisive papilla | D. The incisive papilla is a pad of tissue, located lingual to the maxillary central incisors; it overlays the incisive foramen in the maxillae and protects the nasopalatine nerve. |
| The pterygomandibular raphe is located between the glossopalatine and pharyngopalatine arches; it can be palpated medial to the ramus of the mandible. A. Both = true B. Both = false C. 1st = true 2nd= false D. The 1st = false2nd = true | B. Both statements are false. The pterygomandibular raphe appears as a ridge of tissue between the maxillary tuberosity and retromolar area; the ramus of the mandible is palpated lateral to the raphe. |
| The most crownward portion of a furcation is called the: A. Furcation entrance B. Furcal concavity C. Interfurcal ceiling D. Interfurcal area | C. The interfurcal ceiling is the most crownwards portion of the furcation and is called the ceiling for both maxillary and mandibular teeth. Sometimes it is located more crownward than the furcation entrance. |
| Which statement about the CEJ is false? A Also called cervical line B The junction of clinical crown & anatomic root C The only cemental junc. that can be id'ed with an explorer D More convex on facial surfaces of ant. teeth than post. teeth | B. The CEJ is located at the meeting of the anatomic crown and the anatomic root. |
| The term mamelon is associated with which of the following tooth surfaces? A. Distal B. Incisal C. Mesial D. Occlusal | B. Mamelons are seen as three rounded eminences on the incisal ridge of newly erupted permanent incisors. They make the incisal ridge look scalloped and are a manifestation of incisor development. |
| Which of the following is found only on anterior teeth? A. Cingulum B. Fossa C. Triangular ridge D. Cuspal incline | A. A cingulum is a linguocervical elevation or ridge found only on all anterior teeth. |
| A tooth identified as L in the Universal Numbering System is identified in the International Standards Organization (ISO) TC 106 designation system as: A. 4.4 B. 8.6 C. 3.6 D. 7.4 | D. The primary mandibular left first primary molar is L in the Universal System and #7.4 in the ISO System. |
| Which of the following is true when comp. root trunks of teeth that have 2 or 3 roots? A Molar root trunks are longer than premolars B Max root trunks are longer than mand trunks C 1st molar rt trunks are longer than 2nd molar rt trunks | B max root trunks are longer than mand root trunks; max 1st premolar root trunks are generally at least one 1/2 the length of the root; max 1st molar root trunks are generally at least 1/3 the root length, and 2nd & 3rd molar root trunks are longer. |
| How many roots on a maxillary molar have mesial surfaces to instrument from a buccal approach? A. None B. One C. Two D. Three | C. A maxillary first permanent molar has three roots, two buccal and one lingual. The mesiobuccal and distobuccal roots are both approached from the buccal surface during instrumentation, and each root has a mesial surface. |
| The facial surfaces of the max & mand first primary molars display: A. A prominent buccal pit groove and pit B. A prominent cervical curvature on the mesial half C. Two facial cusps of approximately the same size D. A prominent, pointed mesiobuccal cusp | B. The CEJ on the facial surface of both maxillary and mandibular primary first molars is unevenly convex toward the cervical half with more apical convexity on the mesial half. |
| In the dentition of a typical seven-year-old child, what succedaneous teeth would be present? A. Permanent incisors B. Permanent incisors and permanent first molars C. The primary teeth D. Only the permanent first molars | A. A typical 7 year old will have the following perm teeth: mandibular centrals and 1st molars; mandibular lateral incisors and maxillary central incisors may be erupting. The erupted permanent incisors are succedaneous; the permanent molars are not. |
| The anatomic feature of the maxillary molar used in Angle’s Classification of Malocclusion is: A. Mesiobuccal cusp B. Cusp of Carabelli C. Mesiobuccal (buccal) groove D. Mesiolingual groove | A. The location of the mesiobuccal cusp of the maxillary first permanent molar in relation to the mesiobuccal (buccal) groove of the mandibular first permanent molar is used in Angle’s Classification of Malocclusion. |
| The centric occlusion of a 5-year-old is assessed by the relationship of the: A. Cusps & grooves of the primary 1st molars B. Cusps & grooves of the primary 2nd molars C. Terminus of the primary 2nd molars D. Distal surfaces of the primary canines | C. To assess the centric occlusion of a five-year-old child, the terminal plane or terminus of the second primary molars in centric occlusion should be observed and classified as mesial step, distal step, or flush. |
| Which of the following mandibular movements of mastication has both working and balancing sides? A. Lateral movement B. Opening C. Protrusion D. Retrusion | A. Lateral movement, or excursion or deviation, is the movement of the mandible to the right or to the left during mastication. During lateral movement, the teeth on one side are working and those on the other are not working. |
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