Occlusion and Malocclusion - Development of the Occlusion
10 important questions on Occlusion and Malocclusion - Development of the Occlusion
Stages of dental development?
- Primary dentition
- Mixed dentition - the transitional phase from primary to full permanent dentition
- Permanent dentition
What are the features of the primary dentition?
- Primate spaces (50% of patients)
- Upper arch longer and wider than lower
- OJ=2mm
- OB = 30%
- 'flush terminal plane' molars
What changes occur in the dentition between the ages of 3-6 years?
- Increased intercanine width
- Some spacing of incisors
- Edge-to-edge bite
- 'Class III' incisors
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When does the transition from primary to mixed dentition begin? (ref)
(Fleming et al., 2008 - Dental Update)
List 2 features of the mixed dentition.
- 1/2 unit Class II molars
- Physiological anterior spacing (i.e. Midline Diastema)
How does the occlusion accommodate the larger permanent incisors?
- Permanent incisors erupt more proclined and, therefore, on a wider arc
- Using the primate spaces
- An increase in lateral growth of the jaws
What is the leeway space? (ref)
In the maxilla this is 1.5mm per quadrant and in the mandible it is 2-2.5mm per quadrant.
Transition from primary to permanent dentition uses this space.
(Moyers et al., 1988 - textbook)
How does lateral arch development happen?
When is the permanent dentition usually complete?
Females reach full permanent dentition before males
Why is it important to be aware of normal development of occlusion? (ref)
- Recognising the normal
- Spotting the abnormal
- Knowing when significant events may have happened
- Predicting the future?
(Scott and Atack, 2015 - BDJ)
The question on the page originate from the summary of the following study material:
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