Oral Anatomy 4c - The Maxillary First Deciduous Molar
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Generally how does the maxillary first deciduous molar appear?
- This is the most atypical of all molars, deciduous or permanent.
- In form it appears intermediate between a premolar and a molar.
- It is the smallest molar.
How does the the maxillary first deciduous molar appear when viewed occlusally?
- Viewed occlusally, the crown is an irregular quadrilateral with the buccal and palatal surfaces lying parallel to one another.
- However, the mesiobuccal corner is extended to produce a prominent bulge, the molar tubercle.
- If crowns are to be fitted this bulge may have to be smoother over because of the undercut.
- The mesiopalatal angle is markedly obtuse.
What are the cusps of the maxillary first deciduous molar like?
- The tooth is generally bicuspid; the buccal (more pronounced) and palatal cusps are separated by an occlusal fissure that runs mesiodistally.
- A shallow buccal fissure may extend from the central mesiodistal fissure to divide the buccal cusp in two, the mesial part being the larger.
- The lingual cusp also may be sub-divided into two.
- The tips of the cusps converge towards the midline, reducing the occlusal surface of the tooth.
ow does the maxillary first deciduous molar appear from the buccal aspect?
- From the buccal aspect the crown appears squat, its height being less than its width.
- On the mesial side lies the buccal cingulum which extends to the molar tubercle.
How does the maxillary first deciduous molar appear from the palatal aspect?
From the palatal aspect, the palatal surface appears shorter mesiodistally than the buccal surface, the profile of which can be seen from this view.
How are the mesial and distal views of the maxillary first deciduous molar like?
- The mesial and distal views show the cervical bulbosity of the buccal and palatal surfaces.
- Note the prominent molar tubercle mesially.
- Marginal ridges link the buccal and palatal cusps.
- No fissure crosses the marginal ridges
What are the roots like for the maxillary first deciduous molar like
- The tooth has three roots (ttwo buccal and one palatal) which arise from a common root stalk.
- The mesiobuccal root is flattened mesiodistally;
- The distobuccal root is smaller and more circular;
- The palatal root is the largest and is round in cross section.
- The distobuccal and palatal roots may be partly fused.
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