SpeakerDr. Jeong-il Kim
Lectures 11
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1. Causes of Malocclusion

Treatment will be easier if we know the cause of a disease. 

The causative factors of dental disease can be classified primarily as genetic and environmental factors, 

and secondly as factors related to bones (skeleton), teeth, and soft tissues (environment).

In general, it is thought that bone- or tooth-related problems are genetically determined as opposed 

to problems caused by environmental factors.

Furthermore, bones (skeleton), teeth, and soft tissues (environment) are closely related to each other, 

and some skeletal malocclusion shows a characteristic feature of dental occlusion.

Skeletal malocclusion shows three kinds of compensation to mask for this severity: vertical, dental, 

or joint compensation.

Therefore, we first need to understand what kind of compensation the patient displays in the diagnosis 

of malocclusion. If a dental compensation is shown, we need to observe that the compensation has been 

made not only in the anterior tooth but also the posterior tooth.

Malocclusion treatment consists of adaptation and compensation treatment. Of these, it is recommended 

to choose adaptation treatment rather than compensatory treatment for skeletal malocclusion,

The lecture details the causes of malocclusion: environmental, dental, and skeletal factors.

In particular, it emphasizes the importance of the posterior vertical dimension and the occlusal plane 

among the dental factors.

The decreased vertical dimension is related to some malocclusions and it means that anterior vertical 

dimension and posterior vertical dimension are also important.

Although these kinds of vertical dimension are skeletal factors, they are closely related to 

dental problems. In particular, extrusion of the first molar and mesial angulation caused by 

decreased vertical dimension can affect the occlusal plane.

Therefore, by understanding the association between skeletal and dental factors and adjusting 

the vertical dimension and occlusal plane, we can achieve good results with non-surgical treatment.

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1. Causes of Malocclusion: Introduction 1) Interrelation between bone, muscle, and tooth
2) Muscle adaptation
3) Tooth eruption and eminence development
4) Weak link theory
2. Adaptation and Compensation 1) Adaptation and compensation orthodontic treatment
2) Vertical compensation
3) Adaptation treatment in orthodontics
3. Causes of Malocclusion (Part 1): Environmental Origin 1) Relationship between environmental factors, and bone and dental factors
2) Environmental factors related to specific malocclusions
3) Effects of habitual mouth opening
4) Tongue position and tongue posture
5) Factors that cause lowered tongue position
6) Active or passive tongue thrusting habits
4. Causes of Malocclusion (Part 2): Environmental Origin 1) ENT problems and malocclusion
2) Mouth breathing and characteristic malocclusion, appearance, and TMD
3) Harmful oral habits and malocclusion
4) Functional shift
5. Causes of Malocclusion (Part 3): Dental Origin I 1) Relationship between dental factors, and environmental and skeletal factors
2) Relationship between number of tooth and malocclusion
3) Relationship between size of tooth and malocclusion
4) Relationship between shape of tooth and malocclusion
6. Causes of Malocclusion (Part 4): Dental Origin II 1) Relationship between first-order bends and malocclusion
2) Factors affecting first-order bends
3) Aspects of various malocclusion according to first-order bends change
7. Causes of Malocclusion (Part 5): Dental Origin III 1) Relationship between second-order bends and malocclusion
2) Factors affecting second-order bends
3) Various malocclusions according to second-order bends change
4) Vertical height and occlusal plane
5) Over-eruption of the upper or lower molars
6) Total vertical dimension
7) Posterior occlusal plane (POP)
8. Causes of Malocclusion (Part 6): Dental Origin IV 1) Relationship between third-order bends and malocclusion
2) Crown inclination, occlusal guidance and torque
3) Torque and malocclusion
9. Causes of Malocclusion (Part 7): Skeletal Origin 1) Classification of skeletal pattern
2) Posterior vertical dimension (PVD)
3) Tooth eruption and vertical dimension
4) Orthodontic treatment for skeletal malocclusion patients
10. Discrepancy 1) Anterior discrepancy vs. posterior discrepancy
2) Effects of posterior discrepancy
3) Anterior component of force
11. Low vertical dimension 1) Anterior vertical dimension (AVD) vs. posterior vertical dimension (PVD)
2) Low vertical dimension
3) Potential problems due to low vertical dimension
4) Vertical dimension analysis
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