Dental Anatomy: Maxillary and Mandibular Posterior Teeth

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Questions and Answers

What is a characteristic feature of the Maxillary 1st molar?

It has a small DB cusp frequently present on the D cusp ridge of the MB cusp

Which of the following is true about the Mesial aspect of Maxillary 1st molar?

Mesial marginal groove is more cervically located than Lingually

What is the shape of the Lingual root of the Maxillary 1st molar?

Banana shaped with a strong Buccal curved apical 1/3

What is the characteristic feature of the Occlusal aspect of Maxillary 1st molar?

Trapezoidal M and L profiles are straight and slightly Lingually convergent Signup and view all the answers

What is the feature of the roots of the Maxillary 1st molar?

The roots are strongly divergent Signup and view all the answers

What is the characteristic of the Buccal aspect of Maxillary 1st molar?

The Mesio-distal diameter is greater than the crown height Signup and view all the answers

What is the feature of the Cusps of Maxillary 1st molar?

Has only 2 cusps, MB and ML Signup and view all the answers

What is the characteristic feature of the cervical aspect of Maxillary 1st molar?

Marked cervical constriction Signup and view all the answers

What is the term used to describe the concordance between the morphology of a deciduous molar and the permanent 1st maxillary molar?

Isomorphy Signup and view all the answers

Which of the following features is characteristic of the mandibular 1st deciduous molar?

4-cusped tooth Signup and view all the answers

What is the shape of the mesial profile of the mandibular 1st deciduous molar?

Straight Signup and view all the answers

Which of the following is a characteristic of the buccal aspect of the mandibular 1st deciduous molar?

M half projects more occlusally and occupies 2/3s of crown area Signup and view all the answers

What is the shape of the lingual profile of the CL in the mandibular 1st deciduous molar?

Straight Signup and view all the answers

How many roots does the mandibular 1st deciduous molar have?

2 Signup and view all the answers

What is the characteristic of the distal aspect of the mandibular 1st deciduous molar?

B profile is less bulging than from mesial aspect Signup and view all the answers

What is the shape of the occlusal aspect of the mandibular 1st deciduous molar?

Rectangular Signup and view all the answers

What is the relationship between the morphology of the deciduous molar and the permanent 1st mandibular molar?

The deciduous molar is a model for the permanent 1st mandibular molar, allowing prediction of its morphology. Signup and view all the answers

What is the characteristic of the roots of the deciduous molar?

They are thinner and divergent. Signup and view all the answers

What is the location of the cervical constriction in the deciduous molar?

At the junction of the crown and root. Signup and view all the answers

What is the characteristic of the crown height of the deciduous molar?

It is shorter in the mesiodistal direction and longer in the buccolingual direction. Signup and view all the answers

What is the age at eruption of the deciduous molar?

12-16 months. Signup and view all the answers

What is the characteristic of the transverse ridge of the deciduous molar?

It is interrupted by a central groove. Signup and view all the answers

What is the direction of the supplemental grooves in the deciduous molar?

They cross the ML cusp. Signup and view all the answers

What is the characteristic of the cervical third of the deciduous molar?

It is bulging. Signup and view all the answers

What is the diameter of the MD crown of the deciduous molar?

5.1 mm. Signup and view all the answers

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Study Notes

Morphology of Deciduous Maxillary and Mandibular Posterior Teeth

Maxillary 1st Molar

Morphologically considered a model for the permanent 1st maxillary molar, allowing prediction of its structure
Characteristics: bicusped tooth, cervical constriction, cervical 1/3 bulging, little root trunk, and roots that are thinner and divergent
Buccal aspect: MD diameter is greater than crown height, M part is higher occlusally than D, and marked cervical constriction
Mesial aspect: mesial marginal groove, buccal cervical ridge more prominent than in 2nd molars, and roots are strongly divergent
Occlusal aspect: trapezoidal, M and D profiles are straight and slightly lingually convergent, and triangular supplemental grooves

Mandibular 1st Molar

Morphologically considered a model for the permanent 1st mandibular molar, allowing prediction of its structure
Characteristics: 4-cusped tooth, cervical constriction, cervical 1/3 bulging, little root trunk, and roots that are thinner and divergent
Lingual aspect: 2 cusps (ML and DL), ML cusp is conical and larger than DL
Mesial aspect: buccal cervical ridge, transverse ridge connecting MB and ML, and mesial marginal groove separates M MR from ML cusp ridge
Distal aspect: all 4 cusps and M root profiles are visible, B profile is less bulging than from mesial aspect
Occlusal aspect: rectangular, without buccal cervical ridge, and M MR is high and prominent

Deciduous Posterior Teeth

Sizes and eruption ages:
- 54 or 64: 5.1 mm crown height, 7.3 mm MD diameter, 8.5 mm BL diameter, 15.2 mm tooth length, erupts at 12-16 months
- 55 or 65: 5.7 mm crown height, 8.2 mm MD diameter, 10.0 mm BL diameter, 17.5 mm tooth length, erupts at 20-30 months
- 84 or 74: 6.0 mm crown height, 7.7 mm MD diameter, 7.0 mm BL diameter, 15.8 mm tooth length, erupts at 12-16 months
- 85 or 75: 5.5 mm crown height, 9.9 mm MD diameter, 8.7 mm BL diameter, 18.8 mm tooth length, erupts at 20-30 months