Permanent dentition revision notes quiz
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Permanent dentition revision notes quiz

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Questions and Answers

What is the main characteristic of the mandibular first molars?

  • They have 4 cusps.
  • They have a single root.
  • They have 5 cusps. (correct)
  • They have a triangular crown shape.

    • At what age does the eruption of maxillary first molars generally occur?

  • 5-6 years
  • 8-9 years
  • 4-5 years
  • 6-7 years (correct)

    • Which of the following describes the root structure of maxillary first molars?

  • 2 roots and 2 root canals.
  • 1 root and 1 root canal.
  • 3 roots and 3 or 4 root canals. (correct)
  • 4 roots and 4 root canals.

    • What is the shape of the mandibular first molars' crown?

    <p>Oval</p> Signup and view all the answers

    Which cusp is the largest on the maxillary first molars?

    <p>MP cusp</p> Signup and view all the answers

    When does crown completion of mandibular lateral incisors occur?

    <p>4-5 years</p> Signup and view all the answers

    What is a distinguishing feature of maxillary central incisors?

    <p>Sharp MI angle and rounded DI angle</p> Signup and view all the answers

    What is the smallest cusp on the maxillary first molars?

    <p>DP cusp</p> Signup and view all the answers

    Which of the following best describes the initial calcification timeline for mandibular central incisors?

    <p>3-4 months after birth</p> Signup and view all the answers

    What type of grooves are characteristic of mandibular first molars?

    <p>Curved grooves</p> Signup and view all the answers

    At what age does initial calcification of the maxillary lateral incisors typically occur?

    <p>10-12 months after birth</p> Signup and view all the answers

    Which of the following features is characteristic of the mandibular canines?

    <p>Less pronounced mesial and distal marginal ridges</p> Signup and view all the answers

    What is the typical eruption age for maxillary first premolars?

    <p>10-11 years</p> Signup and view all the answers

    How many pulp horns are generally present in mandibular first premolars?

    <p>1</p> Signup and view all the answers

    Which characteristic distinguishes the maxillary second premolars from other premolars?

    <p>More prominent distal developmental groove</p> Signup and view all the answers

    What is the typical root completion age for maxillary lateral incisors?

    <p>11 years</p> Signup and view all the answers

    Which feature is typically observed in maxillary first premolars?

    <p>One central groove with two fossae</p> Signup and view all the answers

    The eruption of mandibular canines typically occurs around which age?

    <p>9-10 years</p> Signup and view all the answers

    Initial calcification of mandibular first premolars occurs at which of the following ages?

    <p>1 ¾-2 years after birth</p> Signup and view all the answers

    Maxillary lateral incisors can occasionally present which of the following conditions?

    <p>Bi-lacerated roots</p> Signup and view all the answers

    At what age does the eruption of the upper second molars typically occur?

    <p>11-13 years</p> Signup and view all the answers

    What is the typical age range for root completion of lower second molars?

    <p>14-15 years</p> Signup and view all the answers

    What is the initial calcification period for maxillary canines?

    <p>4-5 months after birth</p> Signup and view all the answers

    Which feature is characteristic of mandibular second premolars?

    <p>3 cusps; 1 large buccal and 2 lingual</p> Signup and view all the answers

    What is a common characteristic of lower third molars?

    <p>Variable in size, shape, and root fusion</p> Signup and view all the answers

    What is the crown completion age for lower second molars?

    <p>7-8 years</p> Signup and view all the answers

    During which period does initial calcification of lower second molars occur?

    <p>2 ½ -3 years</p> Signup and view all the answers

    Which upper molar characteristic involves a smaller distal palatal cusp compared to maxillary first molars?

    <p>Upper second molars</p> Signup and view all the answers

    What type of root structure do lower second molars typically exhibit?

    <p>2 roots, with 3-4 canals</p> Signup and view all the answers

    What is the main distinguishing feature of maxillary canines compared to other teeth?

    <p>Concaved palatal surface</p> Signup and view all the answers

    Study Notes

    Permanent Dentition

    • Mandibular First Molars:

      • 5 Cusps: ML, DL, MB, DB, D
      • MB cusp larger than DB cusp
      • ML cusp larger than DL cusp
      • D cusp smallest
      • Oval crown shape
      • 2 buccal developmental grooves, mesial groove deeper and longer
      • 2 roots: mesial and distal, mesial root wider with central groove
      • 3 or 4 root canals, 5 pulp horns

    • Maxillary First Molars:

      • 4 Cusps: MB, DB, MP, DP
      • MP cusp largest, DP cusp smallest
      • Equilateral rhomboid shape
      • Oblique ridge divides occlusal surface, runs from DB to MP cusp
      • P cusps lie further onto occlusal surface
      • 3 roots: MB, DB, P
      • 3 or 4 root canals, 4 pulp horns
      • Cusp of Carabelli may be present on palatal surface of MP cusp

    • Mandibular Central Incisors:

      • Flat labial surface, concaved lingual surface
      • Distal-incisal angle slightly more rounded
      • Cervical undulation
      • Small marginal ridges and cingulum on lingual surface
      • 1 root, 1 root canal, 2 pulp horns: mesial and distal

    • Maxillary Central Incisors:

      • Convexed labial surface, concaved palatally
      • Sharp MI angle, rounded DI angle
      • Mesial and distal marginal ridges meet centrally to form convexed cingulum
      • Hollow cingulum pit
      • CEJ undulates mesially and distally
      • 1 root, 1 root canal, 2 pulp horns: mesial and distal

    • Mandibular Lateral Incisors:

      • More fan shaped than lower central incisor
      • Mesial-incisal angle sharp, Disto-incisal angle rounded
      • Concaved lingual surface
      • More pronounced distal root groove
      • Small cingulum
      • 1 root, 1 root canal, mesial and distal pulp horns

    • Maxillary Lateral Incisors:

      • Smaller, less bulky, and narrower
      • Pronounced rounding of DI angle
      • Mesial and distal marginal ridges palatally
      • Cingulum with pit more pronounced
      • CEJ undulates mesially and distally
      • 1 root, 1 root canal, 2 pulp horns: mesial and distal
      • Can be 'peg' shaped or missing, may have 2 roots or bi-lacerated roots

    • Mandibular Canines:

      • Less bulky than upper canine
      • Convexed labial surface, more bulbous distally
      • Shorter mesial slope
      • 1 cusp inclines distally
      • Less pronounced mesial and distal marginal ridges
      • Mesial and distal lingual fossae, larger distally
      • 1 root, 1 root canal, no pulp horns

    • Maxillary Canines:

      • Convexed labial surface, concaved palatal surface
      • Distal slope longer and surface more bulbous
      • Pronounced medial and distal marginal ridges, large cingulum, can be pointed
      • Mesial and distal palatal fossae
      • Distal root groove more prominent than mesial
      • 1 long root with distal inclination, 1 root canal, no pulp horns
      • Can be impacted

    • Maxillary First Premolars:

      • 2 cusps: buccal and palatal, buccal cusp larger
      • Longer mesial slope
      • Tip of palatal cusp displaced mesially
      • Mesial and distal marginal ridges
      • One central groove with 2 fossae
      • Developmental groove on mesial root between 2 cusps
      • Canine fossae: concavity on mesial root surface houses distal bulge of canine
      • 2 roots, 2 root canals, 2 pulp horns: buccal and palatal
      • Root formation can vary, may have 1 or 2 roots, 2 roots can be partly fused

    • Maxillary Second Premolars:

      • 2 cusps: buccal and palatal, buccal cusp larger, longer distal slope
      • Tip of palatal cusp displaced mesially
      • Mesial and distal marginal ridges
      • One central groove with 2 fossae
      • Apex has distal inclination
      • More prominent distal developmental groove
      • 1 root, 1 or 2 root canals, 2 pulp horns: buccal and palatal
      • May have additional cusp on distal slope or bi-furcated root

    • Mandibular First Premolars:

      • 2 cusps: 1 large buccal, 1 small lingual
      • Buccal cusp angled mesially, leans lingually
      • Shorter mesial slope, bulbous distal surface
      • One central developmental groove
      • 2 fossae: distal fossae larger
      • Lingual cusp overhangs root
      • 1 root, 1 root canal, single pulp horn

    • Mandibular Second Premolars:

      • 3 cusps: 1 large buccal, 2 lingual, ML cusp larger than DL cusp
      • Shorter mesial slope buccally
      • Larger than lower 4s
      • Distal inclination at apex
      • 1 root, 1 root canal, 2-3 pulp horns

    • Lower Second Molars:

      • 4 cusps: MB, DB, ML, DL
      • MB cusp higher than DB cusp, ML cusp higher than DL cusp
      • Wider mesially than distally
      • Cross-shaped groove pattern occlusally
      • Convexed buccal surface
      • Wide and grooved mesial root
      • 4 fossae occlusally
      • Buccal and lingual groove, buccal groove deeper
      • 2 roots, 3-4 root canals, 4 pulp horns

    • Upper Second Molars:

      • 4 cusps: MB, DB, MP, DP
      • Smaller DP cusp than maxillary 6s
      • Oblique ridge and palatal fissure present
      • Not equilateral
      • 3 roots: P, MB, DB (less divergent)
      • 3 or 4 root canals, 4 pulp horns
      • May have fused roots or missing DP cusp

    • Lower Third Molars:

      • 4, 5, or 6 cusps
      • Very convexed buccal surface, bulbous crown
      • Wider mesial root, marked root distal inclination
      • Variable number of roots and root canals
      • Variable in size, shape, presence, impaction, and root fusion

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