Oral Anatomy 4c - The Mandibular First Deciduous Molar
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How does the mandibular first deciduous molar compare to the maxillary first deciduous molar?
Unlike the maxillary first deciduous molar this is molariform, but has a number of unique features.
How does the mandibular first permanent molar appear from the occlusal aspect?
- From the occlusal aspect, the crown appears elongated mesiodistally and is an irregular quadrilateral with parallel buccal and lingual surfaces.
- The mesiobuccal corner is extended, forming a molar tubercle, and the mesiolingual angle is markedly obtuse.
- The occlusal table can be divided into buccal and lingual parts by a mesiodistal fissure.
- The buccal part consists of two cusps, the mesiobuccal cusp being larger than the distobuccal cusp.
- The lingual part of the tooth is narrower than the buccal part and has two cusps separated by a lingual fissure, the mesiolingual cusp being larger than the distolingual cusp.
- The buccal cusps are larger than the lingual cusps.
- A transeverse ridegge may connect the mesial cusps, dividing the mesiodistal fissure into a distal fissure and a mesial pit.
- Often a distal pit is found just mesial to the distal marginal ridge.
- A supplemental groove from the mesial pit may extend over the mesial marginal ridge.
How does the mandibular first deciduous molar appear from the buccal aspect?
- From the buccal aspect, the mesiobuccal cusp occupies at least two-thirds of the crown area and projects higher occlusally than the distobuccal cusp.
- The distal slopes of the buccal cusps are longer than the mesial
- The profile of the mesial surface appears flat, that of the distal surface convex.
- The molar tubercle on the mesial corner of the buccal surface can be seen in this view.
How does the mandibular first deciduous molar appear from the lingual aspect?
- From the lingual aspect, the cusps are conical in shape.
- The distolingual cusp appears only as a bulging protuberance on the distal margin.
How does the mandibular first deciduous molar appear from the mesial and distal aspects?
- Mesially and distally, the buccal and lingual aspects converge towards the midline of the crown.
- The mesial marginal ridge is more prominent than the distal marginal.
- Note the bulge associated with the buccal cingulum near the cervical margin of the mesiobuccal cusp.
What are the roots like for the mandibular first deciduous molar?
The mandibular first deciduous molar has two divergent roots, mesial and distal, which are flattened mesiodistally. The mesial root is often grooved.
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