DA Manual.3

Figure A-28 Maxillary anterior teeth, labial, incisal and lingual views

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Figure A-29 Maxillary anterior teeth, mesial and distal views

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Figure A-30 Mandibular anterior teeth, labial, incisal and lingual views

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Figure A-31 Premolars, buccal, lingual and occlusal views 291

-----------Cervical 1/3

Figure A-32 Premolars, mesial view

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As you compare the maxillary and mandibular first, second, and third molars (Figure A-33), notice that from the first to the third molars the crowns are progressively shorter, roots are progressively shorter, and roots are progressively less divergent. Note (Figure A-34) that the tallest cusps of the maxillary and mandibular molars are the mesiolingual cusps and that the maxillary first molar has a lingual depression.

Figure A-33 Molars, buccal view

Figure A-34 Molars, lingual view

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Notice in Figure A-35, that the oblique ridges (distobuccal cusp triangular ridge and mesiolingual distal cusp ridge) are present on all maxillary molars, the distolingual cusps are progressively smaller from the maxillary first to the third molar, and the mesiodistal and buccolingual dimensions are progressively smaller from the maxillary first to the third molar.

Figure A-35 Maxillary molars, occlusal view Notice in Figure A-36, that the mandibular first molar has five cusps, two buccal grooves, and no transverse ridges. The second and third molars have four cusps, one buccal groove, and the possibility of two transverse ridges. Also notice mesiodistal and buccolingual dimensions are progressively smaller from the maxillary first to the third molar.

Figure A-36 Mandibular molars, occlusal view

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Figure A-37 Cusp-to-marginal ridge and cusp-to-fossa occlusion Notes: 1. Sometimes referred to as the "normal" or "ideal" occlusal scheme. 2. The distal cusp of the mandibular first molar also does not contact the opposing teeth. 3. The mandibular central incisor, lateral incisor, and canine only have one contact. 4. The mandibular lateral incisor's contact is with the maxillary central incisor's distal marginal ridge.

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Figure A-38 Cusp-to-fossa occlusion

Notes: 1. Same notes apply as for the cusp-to-marginal ridge and cusp-to-fossa occlusion. 2. All contacts are with the opposing tooth that has the same named, e.g., the maxillary first premolar only occludes with the mandibular first premolar, the mandibular first molar only occludes with the maxillary first molar, etc.

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Memorize the locations where the maxillary canine and the MB cusp of the maxillary first molar occlude in Figure A-39 and A-40. You can then find your what occludes in the test question.

Figure A-39 Static occlusal relationships

Figure A-40 Static occlusal diagram

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Figure A-41 Dentition from 5 months to 6 years From Nelson SJ, , Ash MM.

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Figure A-42 Dentition from 7 years to adulthood From Nelson SJ, Ash MM. 299

Note bulges on mesiobuccal of maxillary and mandibular primary molars.

Figure A-43 Primary Dentition From Nelson SJ, Ash MM.

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Figure A-44 Primary Dentition Modified from Nelson SJ, Ash MM.

Figure A-45 Angle's Classifications for First Molar Alignment From Ash MM, Ramjford S. Occlusion 4th Edition.

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