3. Development Of Dental Arches And Occlusion In Primary Dentition. Stage Sequencing. Ideal Arch Pattern Flashcards
(23 cards)
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Pre-dental period in development of dental arches and occlusion in primary dentition
- From birth to eruption of first deciduous tooth=>
- Occurs around 6 months of age
- No teeth (neonatal teeth or natal teeth may sometimes be present)
- Oral cavity primarily consists of gum pads=>
- Pink in color, firm, covered by dense layer of fibrous periosteum
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Neonatal teeth
Erupt within first 28 days of life
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Natal teeth
Present at birth
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
How gum pads evolve during pre-dental period
- Initially undivided but soon start to segment
- Segmented by a groove called “transverse groove” into labiobuccal and lingual portions.
- Lateral sulcus further divides pads between canine and first primary molar regions
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
The lateral sulcus
- Groove separating canine and first primary molar region
- Important for assessing interarch relationships from early age
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Characteristics of upper and lower gum pads during pre-dental period
- Upper gum pad horse shoe-shaped and features gingival groove separating gingiva from hard palate
- Lower gum pad U-shaped and rectangular, w/similar features of a gingival groove, dental grooves, and a lateral sulcus
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Occlusal relationships between gum pads during pre-dental period
- Anterior open bite at rest, w/contact only in molar region=>facilitating infantile suckling
- Complete overjet
- Class II pattern predominates, w/ maxillary gum pad being more prominent
- Mandibular lateral sulci lie posteriorly to lateral sulci of maxilla
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Predominant functional movements of the mandible during pre-dental period
- Primarily vertical, w/ limited antero-posterior movements
- Lateral movements absent during this period
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Initiation of primary tooth buds, and significance of this stage
- First six weeks of intrauterine life=>
- Beginning formation of primary teeth
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Typical age range for the eruption of primary teeth
6 months to 2.5 - 3.5 years of age when the second deciduous molars come into occlusion
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Primary dentition period duration, and milestone that marks its end
Until approximately 6 years of age when first permanent tooth starts erupting
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Variability in eruption age
- 3-month variation from mean age considered normal
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Sequencing of primary teeth
The sequence of eruption for deciduous teeth is A-B-D-C-E
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Importance of spacing of primary dentition
- Accommodates larger permanent teeth, particularly prominent in * anterior segment
- Absence of spacing may indicate crowding in permanent dentition
- Primate space=>mesial to upper canines and distal to lower canines=>aids interdigitation and early mesial shift
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Deep bite in primary dentition and factors contributing to its reduction
- At initial stages of development=>
- Accentuated by more upright deciduous incisor
- Later reduced=>
- Eruption of deciduous molars
- Attrition of incisors
- Forward movement of mandible due to growth
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Typical shape of dental arches in the primary dentition stage
Ovoid-shaped during the primary dentition stage
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Molar relationships observed in primary dentition
- Flush terminal plane
- Mesial step
- Distal step
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Flush terminal plane
Upper and lower deciduous second molars’ distal surfaces are in one vertical plane
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Mesial step
Distal surface of mandibular deciduous second molar mesial to distal surface of maxillary deciduous second molar
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Distal step
Distal surface of lower primary second molar is distal to upper primary second molar
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Canine relationships in primary dentition
- Class 1= cusp of maxillary deciduous canine lies between mandibular deciduous canine and first primary molar
- Class 2= cusp of maxillary deciduous canine overlaps cusp of mandibular deciduous canine
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Dental arch form, and its importance
- Formed by buccal and facial surfaces of teeth when viewed from occlusal surfaces=>
- Importance=>stability, occlusion, and aesthetics
3. Development Of Dental Arches And Occlusion- Primary Dentition. Stage
Basic types of arch forms
- Parabolic
- Hyperbolic
- Ellipsoidal
- Square
- Omega
