DOH114 Lecture Notes - Lecture 9: Permanent Teeth, Maryland Route 2, Calcification
Molars
- Largest teeth
- Root anchorage in bone
- First permanent teeth
Maxillary molars
- 3 trifurcated roots: DB < MB < P
- Roots become shorter from 1 → 3
Maxillary first molar
Evidence of Calcification: birth
Enamel Completed: 2.5-3 years
Eruption 6-7 years
Root completed 9-10 years
Identifying features:
- Carabelli cusp may be present.
- Rhomboidal Occlusal outline.
- MP cusp well developed.
- Prominent oblique ridge.
- D, B and P grooves.
- Crown similar width MD and BP.
- 3 roots widely separated – 2 B and 1 P.
- Largest teeth in maxillary arch
- 5 cusps: 3 major, 1 minor, 1 cusp of carabelli
- Broad M-D and just slightly wider B-P than M-D
- 2 buccal 2 palatal 1 carabelli
- 3 roots, 4 pulp horns
- 5 cusps, 5 developmental grooves
Aspect
Features
Drawing
Document Summary
3 trifurcated roots: db < mb < p. Roots become shorter from 1 3. 3 roots widely separated 2 b and 1 p. 5 cusps: 3 major, 1 minor, 1 cusp of carabelli. Broad m-d and just slightly wider b-p than m-d. Palatal: mb, db, mp, dp cusps seen, palatal cusps are located distal to buccal cusps, buccal developmental groove divides buccal cusps, ends in buccal pit, mp cusp larger than b, mp developmental groove separates. Cusp of carabelli from mp cusp: p developmental groove extends from the centre of the p surface between the 2 palatal cusps, where it curves to the distal side and becomes the distal oblique ridge. These 2 grooves (p and d oblique grooves) are sometimes considered to be one dp developmental groove: dp cusp is small (40% of p surface). Proximal mesial: shows a clear profile of cusp of. Carabelli: bp measurement on the mesial side is greater than that on the distal side.
