Dental Anatomy Overview
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Questions and Answers

What is the curvature of the CEJ on the distal surface of a tooth compared to the mesial surface?

About 1 mm less

Tooth roots usually curve mesially.

False (B)

The distal incisal edges of anterior teeth are more pointed than the mesial incisal edges.

False (B)

Mandibular anterior teeth tend to wear on the lingual incisal edges.

<p>False (B)</p> Signup and view all the answers

Permanent molars are generally larger in height and have more cusps than deciduous molars.

<p>False (B)</p> Signup and view all the answers

Permanent molars tend to have less secondary and tertiary anatomy than deciduous molars.

<p>False (B)</p> Signup and view all the answers

The roots of molars tend to be longer and farther apart the more posterior they are positioned.

<p>False (B)</p> Signup and view all the answers

The more posterior a molar is positioned, the less variation in its anatomy is evident.

<p>False (B)</p> Signup and view all the answers

Deciduous teeth are larger in size than permanent teeth.

<p>False (B)</p> Signup and view all the answers

Deciduous teeth have a greater width-to-height ratio than permanent teeth.

<p>True (A)</p> Signup and view all the answers

Deciduous teeth have less prominent cervical ridges, incisal edges, and a less constricted cervix compared to permanent teeth.

<p>False (B)</p> Signup and view all the answers

Deciduous teeth have weaker and thinner roots compared to permanent teeth.

<p>True (A)</p> Signup and view all the answers

Incisors have a cusp on their incisal edge.

<p>False (B)</p> Signup and view all the answers

Maxillary incisors are wider mesiodistally than faciolingually.

<p>True (A)</p> Signup and view all the answers

The root of a maxillary incisor is narrower on the facial side than on the lingual side.

<p>False (B)</p> Signup and view all the answers

Maxillary central incisors have a smaller crown-to-root ratio than maxillary lateral incisors.

<p>False (B)</p> Signup and view all the answers

The mesio-incisal angle of a maxillary central incisor is rounded.

<p>False (B)</p> Signup and view all the answers

The contact area of a maxillary central incisor is located in the incisal third.

<p>True (A)</p> Signup and view all the answers

Maxillary central incisors have a narrow, shallow lingual fossa without a cingulum.

<p>False (B)</p> Signup and view all the answers

Maxillary lateral incisors have a greater crown-to-root ratio than maxillary central incisors.

<p>False (B)</p> Signup and view all the answers

The mesio-incisal angle of a maxillary lateral incisor is sharp and defined.

<p>False (B)</p> Signup and view all the answers

The contact area of a maxillary lateral incisor is located at the junction of the middle and incisal thirds.

<p>True (A)</p> Signup and view all the answers

Maxillary lateral incisors have a prominent cingulum.

<p>False (B)</p> Signup and view all the answers

The mesio-incisal angles of incisors are more rounded than the disto-incisal angles.

<p>False (B)</p> Signup and view all the answers

The crest of the cervical line on incisors is more often displaced distally.

<p>True (A)</p> Signup and view all the answers

The mesio-cervical line on incisors curves more incisally than the disto-cervical line.

<p>True (A)</p> Signup and view all the answers

Mandibular incisors are larger than maxillary central or lateral incisors.

<p>False (B)</p> Signup and view all the answers

The crown of a mandibular incisor is wider faciolingually than mesiodistally.

<p>True (A)</p> Signup and view all the answers

Mandibular incisors have a square root cross-section.

<p>False (B)</p> Signup and view all the answers

Mandibular incisors generally wear on the lingual surface.

<p>False (B)</p> Signup and view all the answers

The incisal edge of a mandibular incisor is angled towards the labial side.

<p>False (B)</p> Signup and view all the answers

The incisal edge of a mandibular central incisor is perpendicular to the faciolingual axis of the tooth.

<p>True (A)</p> Signup and view all the answers

The mesial and distal lobes of a mandibular central incisor look different.

<p>False (B)</p> Signup and view all the answers

The cervical line of a mandibular central incisor curves more incisally on the mesial side than on the distal side.

<p>True (A)</p> Signup and view all the answers

The root tip of a mandibular central incisor is more likely to have a mesial curve.

<p>False (B)</p> Signup and view all the answers

Mandibular central incisors are more likely to show wear on the mesial surface.

<p>False (B)</p> Signup and view all the answers

The distoincisal edge of a mandibular lateral incisor is angled towards the labial side.

<p>False (B)</p> Signup and view all the answers

The mesial lobe of a mandibular lateral incisor is generally larger than the distal lobe.

<p>False (B)</p> Signup and view all the answers

Canines have a single, conical cusp with a well-developed mesiofacial lobe.

<p>True (A)</p> Signup and view all the answers

Canines have a lingual cusp ridge that extends from the cusp tip to the lingual fossa.

<p>True (A)</p> Signup and view all the answers

Maxillary canines have a poorly developed marginal ridge, cingulum, and fossa on the lingual surface.

<p>False (B)</p> Signup and view all the answers

Maxillary canines have a larger crown than incisors and mandibular canines.

<p>True (A)</p> Signup and view all the answers

The mandibular canines are more rounded than maxillary canines.

<p>True (A)</p> Signup and view all the answers

The cusp tip of a maxillary canine is located directly midcenter over the root.

<p>True (A)</p> Signup and view all the answers

The cervical line on a maxillary canine curves more incisally on the distal side than on the mesial side.

<p>False (B)</p> Signup and view all the answers

The distofacial lobe of a maxillary canine is elongated when viewed from the incisal angle.

<p>True (A)</p> Signup and view all the answers

The distal surface of a maxillary canine is rounded when viewed from the facial angle.

<p>True (A)</p> Signup and view all the answers

The contact area of a maxillary canine is located more cervically.

<p>True (A)</p> Signup and view all the answers

Mandibular canines have a well-developed cingulum and fossa on the lingual surface.

<p>False (B)</p> Signup and view all the answers

Mandibular canines are wider than maxillary canines.

<p>False (B)</p> Signup and view all the answers

Mandibular canines are more likely to show wear on the facial (labial) surface than maxillary canines.

<p>True (A)</p> Signup and view all the answers

Mandibular canines are more prominent than maxillary canines.

<p>False (B)</p> Signup and view all the answers

Premolars have at least three cusps, with at least two being lingual cusps.

<p>False (B)</p> Signup and view all the answers

Maxillary premolars have two major cusps: buccal and mesial.

<p>False (B)</p> Signup and view all the answers

Maxillary premolars are wider mesiodistally than faciolingually.

<p>False (B)</p> Signup and view all the answers

The facial and lingual cusps of maxillary premolars are nearly the same height.

<p>True (A)</p> Signup and view all the answers

Maxillary premolars are located over the root trunk.

<p>True (A)</p> Signup and view all the answers

The facial cusp of a maxillary first premolar is shorter than the lingual cusp.

<p>False (B)</p> Signup and view all the answers

Maxillary first premolars have two roots, buccal and lingual, in over 95% of cases.

<p>True (A)</p> Signup and view all the answers

The occlusal surface of a maxillary first premolar has a well-developed central groove, with numerous supplemental grooves.

<p>False (B)</p> Signup and view all the answers

The mesial surface of a maxillary first premolar has a depression below the cervical line.

<p>True (A)</p> Signup and view all the answers

The mesial marginal groove of a maxillary first premolar is a very distinguishing feature.

<p>True (A)</p> Signup and view all the answers

The cervical line on the mesial surface of a maxillary first premolar curves more occlusally than on the distal surface.

<p>True (A)</p> Signup and view all the answers

The mesio-facial cusp ridge of a maxillary first premolar forms a rounded angle with the mesial marginal ridge.

<p>False (B)</p> Signup and view all the answers

The disto-facial cusp ridge of a maxillary first premolar forms a sharp angle with the distal marginal ridge.

<p>False (B)</p> Signup and view all the answers

Maxillary second premolars have two roots: facial and lingual.

<p>False (B)</p> Signup and view all the answers

Maxillary second premolars have a large, central groove.

<p>False (B)</p> Signup and view all the answers

Maxillary second premolars have a depression on the mesial surface.

<p>False (B)</p> Signup and view all the answers

The lingual cusp of a maxillary second premolar is displaced towards the mesial side.

<p>True (A)</p> Signup and view all the answers

Mandibular premolars have a dominant lingual cusp.

<p>False (B)</p> Signup and view all the answers

Mandibular premolars are narrower mesiodistally than faciolingually.

<p>False (B)</p> Signup and view all the answers

The facial cusp of a mandibular premolar is smaller than the lingual cusp.

<p>False (B)</p> Signup and view all the answers

The lingual cusps on a mandibular premolar extend lingually past the lingual border of the root.

<p>True (A)</p> Signup and view all the answers

The occlusal surface of a mandibular first premolar is tilted towards the mesial side.

<p>False (B)</p> Signup and view all the answers

The cervical line on a mandibular first premolar curves more occlusally on the distal side than on the mesial side.

<p>False (B)</p> Signup and view all the answers

The occlusal view of a mandibular first premolar is shaped like a triangle.

<p>False (B)</p> Signup and view all the answers

There is a central pit present in the occlusal view of a mandibular second premolar.

<p>True (A)</p> Signup and view all the answers

Mandibular second premolars are more similar in appearance to molars than mandibular first premolars.

<p>True (A)</p> Signup and view all the answers

The occlusal surface of a mandibular second premolar is significantly tilted towards the lingual side.

<p>False (B)</p> Signup and view all the answers

Mandibular second premolars can have two lingual cusps.

<p>True (A)</p> Signup and view all the answers

Molars typically have three to five cusps, with at least two being lingual cusps.

<p>False (B)</p> Signup and view all the answers

Maxillary molars have a wider crown in the mesiodistal direction than in the faciolingual direction.

<p>False (B)</p> Signup and view all the answers

Maxillary molars typically have two roots on the facial side and one root on the lingual side.

<p>True (A)</p> Signup and view all the answers

The oblique ridge on a maxillary first molar is likely to be crossed by a groove.

<p>False (B)</p> Signup and view all the answers

The roots of a maxillary first molar are closely held together.

<p>False (B)</p> Signup and view all the answers

A fifth cusp, known as Carabelli's cusp, is often present on the mesiolingual cusp of a maxillary first molar.

<p>True (A)</p> Signup and view all the answers

The oblique ridge on a maxillary second molar is usually interrupted by a groove.

<p>True (A)</p> Signup and view all the answers

The mesiolingual cusp on a maxillary second molar is smaller than the distolingual cusp.

<p>False (B)</p> Signup and view all the answers

The roots of a maxillary second molar are farther apart than the roots of a maxillary first molar.

<p>False (B)</p> Signup and view all the answers

A fifth cusp is typically present on a maxillary second molar.

<p>False (B)</p> Signup and view all the answers

The distolingual cusp on a maxillary third molar is typically smaller than the distolingual cusp on a maxillary first molar.

<p>True (A)</p> Signup and view all the answers

Maxillary third molars typically have a distinct oblique ridge.

<p>False (B)</p> Signup and view all the answers

Maxillary third molars have three main cusps.

<p>False (B)</p> Signup and view all the answers

Maxillary third molars are frequently fused together.

<p>True (A)</p> Signup and view all the answers

The roots of maxillary third molars are longer than the roots of maxillary first molars.

<p>False (B)</p> Signup and view all the answers

The disto-facial cusp of a maxillary third molar is much shorter than the disto-facial cusps of other maxillary molars.

<p>True (A)</p> Signup and view all the answers

The roots of maxillary third molars are typically curved mesially.

<p>False (B)</p> Signup and view all the answers

Mandibular molars have a wider crown faciolingually than mesiodistally.

<p>False (B)</p> Signup and view all the answers

Mandibular molars typically have three roots.

<p>False (B)</p> Signup and view all the answers

Mandibular first molars have four facial cusps.

<p>False (B)</p> Signup and view all the answers

The roots of mandibular first molars are closely together.

<p>False (B)</p> Signup and view all the answers

Mandibular second molars have three facial cusps and a distinct occlusal groove.

<p>False (B)</p> Signup and view all the answers

Mandibular second molars have more secondary anatomy than mandibular first molars.

<p>True (A)</p> Signup and view all the answers

The occlusal groove of a mandibular second molar runs straight from the mesial to the distal side.

<p>True (A)</p> Signup and view all the answers

The buccal height of the contour on a mandibular second molar is greater in the middle third than in the cervical third.

<p>False (B)</p> Signup and view all the answers

Mandibular third molars are similar in morphology to mandibular second molars.

<p>True (A)</p> Signup and view all the answers

Mandibular third molars typically have a large central groove.

<p>False (B)</p> Signup and view all the answers

Mandibular third molars have very long roots.

<p>False (B)</p> Signup and view all the answers

The crown of a mandibular third molar tapers mesially.

<p>False (B)</p> Signup and view all the answers

The crown of a mandibular third molar is wider from the facial to lingual side on the distal surface than on the mesial surface.

<p>False (B)</p> Signup and view all the answers

Study Notes

Dental Anatomy Study Notes

  • Tooth Identification - General Rules
    • The cemento-enamel junction (CEJ) curves approximately 1mm less on the distal surface than the mesial surface of the tooth.
    • Roots often curve distally, particularly at the apex.
    • Distal incisal edges of anterior teeth are more rounded than mesial edges.
    • Mandibular anterior teeth tend to wear on the labial incisal edges, while maxillary teeth wear on lingual incisal edges.
    • Permanent molars generally reduce in height and number of cusps as they become more posterior.
    • Molar anatomy (1st, 2nd, 3rd) increases in complexity as they become more posterior in the jaw.
    • Root length and fusion increases as molars become more posterior.

Deciduous vs Permanent Dentition

  • Deciduous teeth are smaller in size compared to permanent teeth.

Incisors

  • Maxillary Incisors
    • Crown is wider mesiodistally than faciolingually.
    • Root has a triangular cross-section, broader on the facial side.
  • Central Incisor:
  • Higher crown-to-root ratio than lateral incisors.
  • Mesioincisal angle is 90 degrees.
  • Contact area in incisal third.
  • Smooth lingual fossa with cingulum.
  • Lateral Incisor:
  • Lower crown-to-root ratio than central incisors.
  • Mesioincisal angle is rounded.
  • Contact area at the junction of middle and incisal thirds.
  • Smaller cingulum, often with lingual pit.
  • Mandibular Incisors
  • Smaller than maxillary incisors.
  • Crown is wider faciolingually than mesiodistally.
  • Root has an oval cross-section.
  • Incisal edge wears on the labial surface.
  • Incisal edge angled toward the lingual side.
  • Central Incisor:
  • Incisal view: incisal edge perpendicular to faciolingual axis of tooth.
  • Mesial and distal lobes appear identical.
  • Cervical line curves more incisally on the mesial than the distal surface.
  • Greater height of cervical curvature on mesial than distal.
  • Root tip may have a slight distal curve.
  • Incisal edge worn wider on distal surface.
  • Lateral Incisor:
  • Incisal view: distoincisal edge angled toward lingual side.
  • Distal lobe appears larger than the mesial lobe.

Canines

  • Maxillary Canines

    • Single conical cusp with a well-developed mesiofacial lobe.
    • Lingual cusp ridge from cusp tip to lingual fossa.
    • Lingual surface has well-developed marginal ridges, cingulum, and fossa (compared with mandibular canine)
    • Larger crown than incisors and lower canines, with more distal convexity.
    • Cusp tip directly midcenter over root.

  • Mandibular Canines

    • Lingual surface almost smooth with poorly developed ridges, cingulum, and fossa.
    • Narrower mesiodistal width than maxillary canines.
    • More wear on facial surface compared to maxillary canines.
    • Less prominent in all aspects compared to maxillary canines.

Premolars

  • Maxillary Premolars

    • Two major cusps: buccal and lingual.
    • Wider faciolingually than mesiodistally.
    • Proximal view: facial and lingual cusps are nearly the same height and located over the root trunk.

  • First Premolar:

  • Facial cusp is slightly longer than lingual cusp (1mm).

  • Often has two roots (buccal and lingual). Over 95%.

  • Occlusal surface has well-developed central groove with little supplemental grooving.

  • Mesial surface shows depression above contact area extending onto the root.

  • Second Premolar:

  • Facial and lingual cusps are nearly same height.

  • Usually single-rooted.

  • Short central groove; numerous supplemental grooves present.

  • No depression on mesial or distal crown surfaces.

  • Lingual cusp is displaced toward mesial.

  • Mandibular Premolars

    • Prominent facial cusp with one or two much smaller lingual cusps.
    • Nearly equal faciolingual and mesiodistal widths.
    • Proximal view: facial cusp much larger with tip at or near midaxis of root; lingual cusp(s) extend lingually past lingual border of root.

  • First Premolar:

  • Proximal view: occlusal surface tilted towards lingual side.

  • Cervical line on mesial curves more occlusally than on distal.

  • Occlusal view: oval outline with strong transverse ridge and no central pit.

  • Second Premolar:

  • Occlusal view: pentagonal outline with a central pit and no transverse ridge.

  • The biggest occlusal (all premolars are transitory teeth) but at lower 5 we're very close to molars

  • Proximal view: more occlusal surface visible from distal than mesial due to distal inclination of crown/root axis.

  • May have two lingual cusps.

Molars

  • Maxillary Molars

    • Three to five cusps, including at least two facial cusps.

  • First Molar:

  • Crowns wider faciolingually than mesiodistally.

  • Three roots: two on facial and one on lingual side.

  • Occlusal view: strong oblique ridge less likely to be crossed by a groove.

  • Three roots widely separated.

  • Often five cusp (Carabelli's) on mesiolingual cusp (useful for distinguishing left/right).

  • Second Molar

  • Occlusal view: smaller oblique ridge usually interrupted by a groove.

  • Third Molar

  • Distolingual cusp progressively smaller or missing entirely.

  • No oblique ridge

  • Heart shape

  • Roots either fused or very close together and much shorter.

  • Distofacial cusp much shorter than other molars.

  • Roots curved distally.

  • Mandibular Molars

  • Crowns wider (bigger) mesiodistally than faciolingually

  • Always two roots: one mesial and one distal.

  • First Molar:

  • Three facial cusps and two facial grooves.

  • Roots widely separated and relatively vertical.

  • Second Molar:

  • Only two facial cusps and one facial groove.

  • Roots close together.

  • More secondary anatomy than first lower molar.

  • Occlusal groove well defined but travels straight mesial to distal.

  • Third Molar:

  • Similar to second molar, including secondary and tertiary anatomy, short roots often fused, and curved distally.

  • Crown tapers distally, wider faciolingually on mesial than on distal.

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Description

This quiz covers essential aspects of dental anatomy, including tooth identification rules, the differences between deciduous and permanent dentition, and specific characteristics of maxillary incisors. Perfect for dental students wanting to test their knowledge on key anatomical features.

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