Dental Anatomy & Occlusion Flashcards

What is the 'Angle Class I molar relationship'?

Answer: Mesiobuccal cusp of upper first molar occludes in the buccal groove of the lower first molar

Angle Class I: the mesiobuccal cusp of the maxillary first molar occludes in the buccal groove of the mandibular first molar. This is considered the ideal molar relationship.

What is the 'working side' in lateral excursion of the mandible?

Answer: The side towards which the mandible moves during lateral jaw movement

The working side (chewing side) is the side towards which the mandible moves in lateral excursion. The working-side condyle pivots and rotates; the balancing-side condyle makes a translatory Bennett movement.

What is the formula for the primary dentition and how many primary teeth are there?

Answer: I 2/2, C 1/1, M 2/2 = 20 teeth total

The primary dentition has 20 teeth: 2 central incisors, 2 lateral incisors, 2 canines, 2 first molars, and 2 second molars per arch (10 upper, 10 lower). There are no premolars in the primary dentition.

What is the typical eruption sequence of the mandibular permanent teeth?

Answer: First molar, central incisor, lateral incisor, canine, first premolar, second premolar, second molar, third molar

The mandibular permanent eruption sequence is typically: 1st molar (6yrs), central incisor (6–7), lateral incisor (7–8), canine (9–10), 1st premolar (10–11), 2nd premolar (11–12), 2nd molar (11–13), 3rd molar (17–21).

What is 'mutually protected occlusion'?

Answer: An occlusal scheme where posterior teeth protect anterior teeth in maximum intercuspation, and anterior teeth protect posterior teeth during excursive movements

In mutually protected (organically) occlusion: the posterior teeth protect anterior teeth from heavy vertical loading in MIP; the anterior teeth (canine guidance or group function) disocclude the posterior teeth during excursive movements.