Development Of Occlusion Flashcards
It is the changing interrelationship of the opposing surfaces of the maxillary and mandibular teeth ehich occur during movements of the terminal full contact of the maxilla and mandibular arches
Occlusion
The term occlusion is derived from what Latin word?
occlusio
Ideal occlusion is the result of developmental process consists of 3 main event, what are those?
Jaw growth
Tooth formation
Tooth eruption
What are the stage of development of occlusion?
pre-dentate period
Deciduous dentition period
Mixed dentition period
Permanent dentition period
Mixed dentition period is further subdivided into 3 , what are those?
1st transition period
Intertransition period
2nd transition period
It refers to the period from birth to the eruption of first deciduous tooth in the oral cavity
Pre-dental/dentate period
True or False
A delay in eruption of first deciduous teeth by 4-10 months is considered normal
True
It is horse shoe shape and extends labially and bucally
Maxillary gum pad
The maxillary gum pad develops into 2 part, what are those?
Labio-buccal
Lingual
It is U shaped and are anteriorly everted
Mandibular gum pads
What are the parts of the maxillary gum pad?
Gingival groove Dental groove Transverse groove Lateral sulcus Incisive papilla
It separates the gum pads from the palate
Gingival groove
It extends from the incisive papilla, backwards to touch the gingival groove in the canine region and continues forward in the molar region
Dental groove
These are depression between the 10 segments of the gum pads
Transverse grooves
These are transverse grooves between the canine and molar sac region
Lateral sulcus
What are the oarts of mandibular gum pads?
Dental groove, gingival groove, transverse groove, lateral sulcus
What is the difference between max and man gum pads?
10 segments in mandibular gum pads are less demarcated compared to the max gum pads
It demarcates the lingual extent
Gingival groove
It runs backward, and laterally in the canine region
Dental groove
Between max and man gum pads which is wider?
Maxillary gum pads
The length of gum pads usually increases where?
Posterior direction
What deciduous tooth is the first to erupt?
Mandibular central incisors
At what ages does deciduous central incisors erupt?
8 months (6-10 mo)
Age of eruption - lateral incisors
13 ( 10-16 months)
Age of eruption - canine
20 ( 17-21 months)
Age of eruption - 1st molar
16 ( 14-18 mos)
Age of eruption - 2nd molar
27 mos
What are the features of deciduous dentition?
Spacing Terminal plane relation of deciduous dentition Deep bite Dental arches - wide U-Shape Flat curve of spee Shallow cuspal interdigitation Vertically placed incisors
Period where permanent mandibular 1st molar erupts
1st transitional stage
It guides permanent 1st molar into the arch
Deciduous 2nd molar
It determines the permanent molar relation as it erupts into occlusion
Deciduous 2nd molar
If the 2nd deciduous molars are in a flush terminal relation, what would be the relation of permanent 1st molar?
Class I
The mandibular molar moves __ to ____ mesially relative to the upper molar and it utilizes the primate space and the forward growth of the mandible
3-5 mm
It happens when eruptive forces of permanent 1st molar push deciduous 1st and 2nd molar forward
Early mesial shift
If there is a lack in primate space, the 2nd deciduous molar must exfoliate
Late mesial shift
Exchange of lower incisors takes place. The difference between the amount of space needed for the accommodation of incisors
Incisal liability
Incisal liability in upper arch is ____
7mm
Incisal liability in mandibular arch
5mm
How to overcome incisal liability?
- Utilization of the interdental spacing seen in primary dentition
- Increase in intercanine width
- Change in incisor inclination
What period is it when deciduous canine and molars are between permanent incisors and molar?
Inter-transitional period
This is the phase of mixed dentition where there are no changes happens
Inter-transitional period
This is the period where the deciduous molars and canines are replaced by permanent premolars and canine respectively
2nd transitional period
It is the combined mesiodistal width of permanent canines and premolars and is usually less than that of deciduous canines and molars
Leeway space of Nance
It is a self correcting malocclusion that is seen in maxillary incisor region between 8-9 y/o
Ugly duckling stage
Who described the ugly duckling stage
Broadbent
Also known as Broadbent phenomenon
