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Questions and Answers

What is Class II malocclusion and how is it characterized?

Class II malocclusion is characterized by the M-B cusp of the upper 1st molar occluding mesial to the buccal groove of the lower 1st molar, with distocclusion.

What are the differences between Class II div 1 and Class II div 2 malocclusions?

Class II div 1 presents with buccal inclination of upper incisors and increased overjet, while Class II div 2 presents with palatal inclination of upper incisors and decreased overjet.

What are some occlusal features observed in Class II malocclusion?

Various occlusal features, such as molar/canine class, overjet, open bite/deep bite, cross bite/scissor bite, and ALTSD (positive/negative), are observed.

What are some skeletal features associated with Class II malocclusion?

Skeletal features include volumetric and positional discrepancies between basal and alveolar bones, as well as protrusion/macrognathism of the maxilla and retrusion/micrognathia of the mandible. Signup and view all the answers

What are some neuromuscular features associated with Class II malocclusion?

Neuromuscular features include lip and tongue incompetence, labial bi-protrusion, mentalis muscle contraction, lower lip interposition, and orolabial contraction. Signup and view all the answers

What is cephalometric analysis used for in the diagnosis and treatment of Class II malocclusion?

Cephalometric analysis is used to identify skeletal problems, facial patterns, and dental positions, such as ANB, SNA, SNB, facial convexity, facial depth, and growth pattern. Signup and view all the answers

What are some treatment options for Class II malocclusion?

Treatment options include prevention, habit correction, and rehabilitation, with the latter including orthodontics, surgery, speech therapy, prosthodontics, and psychology. Signup and view all the answers

Question 1

What are the six keys to normal occlusion according to Andrews? Signup and view all the answers

Answer 1

Class I molar relationship, M-D crown angulation, torque, rotations, diastema, and occlusal plane. Signup and view all the answers

Question 2

What are the five types of malocclusion in the Dewey Classification? Signup and view all the answers

Answer 2

Type 1: Crowding with canine buccally/lingually displaced, straight profile. Type 2: Upper incisor buccal protrusion with diastemas and a protruded upper lip. Type 3: Anterior cross bite with a straight profile and the upper lip more retruded than the lower lip. Type 4: Transversal problem with cross/scissor bite and an open mouth. Type 5: Mesial migration in any sector with a buccally displaced upper canine. Signup and view all the answers

Question 3

What is bi-protrusion and bi-retrusion syndrome in Class I malocclusion? Signup and view all the answers

Answer 3

Bi-protrusion is an excess growth of both jaws, while bi-retrusion is a growth deficit in the sagittal plane. Signup and view all the answers

Question 4

What are the four types of arch relation disorders? Signup and view all the answers

Answer 4

Cross bite (transversal), open bite (vertical), deep bite (vertical), and non-sagittal problem. Signup and view all the answers

Question 5

What is the ideal occlusion in terms of arch form, overjet, overbite, and interincisal angle? Signup and view all the answers

Answer 5

Bilateral molar + canine Class I, centered midlines, overjet 2mm, overbite 1/3, interincisal angle 130o, and arch form: ovoid. Signup and view all the answers

Study Notes

Diagnosis and Treatment of Class II Malocclusion

Class II malocclusion is characterized by the M-B cusp of the upper 1st molar occluding mesial to the buccal groove of the lower 1st molar, with distocclusion.
Class II div 1 presents with buccal inclination of upper incisors and increased overjet, while Class II div 2 presents with palatal inclination of upper incisors and decreased overjet.
Various occlusal features, such as molar/canine class, overjet, open bite/deep bite, cross bite/scissor bite, and ALTSD (positive/negative), are observed.
Skeletal features include volumetric and positional discrepancies between basal and alveolar bones, as well as protrusion/macrognathism of the maxilla and retrusion/micrognathia of the mandible.
Neuromuscular features include lip and tongue incompetence, labial bi-protrusion, mentalis muscle contraction, lower lip interposition, and orolabial contraction.
Intraoral analysis involves assessing sagittal, transversal, and vertical planes, as well as volumetric relations and identifying crowding or diastemas.
Cephalometric analysis is used to identify skeletal problems, facial patterns, and dental positions, such as ANB, SNA, SNB, facial convexity, facial depth, and growth pattern.
Treatment options include prevention, habit correction, and rehabilitation, with the latter including orthodontics, surgery, speech therapy, prosthodontics, and psychology.
Oral breathing, tongue thrusting, and lip interposition habits can be corrected through various means, such as expansion, tongue exercises, and lip bumper appliances.
Mesial migration of upper 6s and molar rotation can be corrected through derotation, distalization, extractions, or growth pattern control.
Alternatives for inhibiting downward and forward growth or mesial migration of dentition include distalizing, growth pattern control, and selective extractions.
Treatment options for the mandible include sagittal growth stimulation, anterior repositioning, dentoalveolar modification, and selective extractions, while functional appliances, extroral appliances, molar distalization, dental extractions, and orthognathic surgery can be used for growing and non-growing patients.

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Test your knowledge on the diagnosis and treatment of Class II Malocclusion with this quiz! From identifying occlusal and skeletal features to understanding treatment options, this quiz covers it all. Whether you're a dental student or a practicing orthodontist, this quiz will challenge your understanding of Class II Malocclusion and help you enhance your expertise in this field. So, let's get started and see how much you know!