Overview of the Primary Dentition

Overview of the Primary Dentition

Overview of the Primary Dentition

Overview of the Primary Dentition

Overview of the Primary Dentition Dental Formulas Shorthand summary of teeth present Maxillary quadrant/mandibular quadrant Multiply by 2 for entire dentition

Examples of Dental Formulas Overview of the Primary Dentition Examples of Dental Formulas Human permanent dentition I 2/2 C 1/1 P 2/2 M 3/3 Human primary dentition I 2/2 C 1/1 M 2/2 Cats I 3/3 C 1/1 P 3/2 M 1/1 Dogs I 3/3 C 1/1 P 4/4 M 2/3

Numbering of Primary Teeth Overview of the Primary Dentition Numbering of Primary Teeth Universal system: A to T Palmer: A to E by quadrant FDI: 1st number 5– 8, second 1 to 5

Overview of the Primary Dentition Dentition Periods Primary dentition period: only primary teeth are present, 6 months to 6 years Mixed dentition period: the primary teeth are being replaced by the permanent teeth, 6 to 12 years Permanent dentition period: after the last primary tooth has exfoliated

Overview of the Primary Dentition Dentition Periods Primary Mixed Permanent

Overview of the Primary Dentition Clinical question: Why is it important to maintain the health of the primary teeth? Mastication of solid foods Speech development Esthetics and self-esteem Space for eruption of permanent teeth Health of the permanent teeth

Eruption of Permanent Teeth Overview of the Primary Dentition Eruption of Permanent Teeth 1st molars are first permanent teeth to erupt. Referred to as 6 year molars They erupt distal to primary dentition.

Overview of the Primary Dentition Eruption Sequence In general, mandibular teeth erupt before maxillary counterpart. 1st molars are first permanent teeth to erupt. Central incisors are first SUCCEDANEOUS teeth to erupt. Note the late eruption of the maxillary canine: may be impacted due to space loss. Succedaneous teeth are permanent teeth that replace primary teeth. AB D C E A B D CE

General Differences Between Primary and Permanent Teeth Overview of the Primary Dentition General Differences Between Primary and Permanent Teeth Size: smaller in all dimensions. Color: lighter in color. Crowns: bulbous, wider mesiodistally, shorter incisocervically CEJ: appears constricted Roots: longer and more slender

Primary-Permanent Comparisons: Molars Overview of the Primary Dentition Primary-Permanent Comparisons: Molars

Primary – Permanent Comparisons: Differences in Internal Anatomy Overview of the Primary Dentition Primary – Permanent Comparisons: Differences in Internal Anatomy Primary teeth have: thinner enamel & dentin relatively larger pulp cavities Pulp horns are closer to outer surface Great variation in size & location Form of pulp follows external anatomy Usually a pulp horn under each cusp **Mesial pulp horn is higher

Primary Posterior Teeth Overview of the Primary Dentition Primary Posterior Teeth Short, bulbous crowns Slender, flared roots Short root trunk Second molars > first molars

Maxillary First Molar (Deciduous) GROUP 6: Celso, Anne R. Flores, Joyce Anne G. Jung, Young Min Parmar, Asma Ramirez, Jan Andre P.

Primary Maxillary Molars Overview of the Primary Dentition Primary Maxillary Molars 3 roots 1st resembles a maxillary premolar 2nd resembles a permanent maxillary 1st molar

Buccal Aspect DBR,MBR, and palatal root Slender and long Spread widely Mesial half of the crown has a greater height DBR,MBR, and palatal root Slender and long Spread widely

Buccal Aspect Distal root is shorter than Mesial root Lingual root is positioned midway bet. the Bu roots

Buccal Aspect Bifurcation of the roots begins almost immediately at the Cervical line Little root trunk

Lingual Aspect Almost similar to buccal aspect MLC is prominent DLC is poorly defined DBC visible

Lingual Aspect All roots visible Li root is larger MD Li surface is entirely made up one cusp Slightly convex occlusocervically, but markedly convex MD

Occlusal Aspect MB, DB line angle are greater than ML,DL line angle Mesial line angles are greater than Distal line angles Crown converges lingually and distally Occlusal surface is nearly rectangular Has a center fossa and pit

Occlusal Aspect Has BG and LG Has a Mesial Triangular Fossa Mesial pit No distal pit Supplementary groove in the mesial pit

Mesial Aspect Cervical width is much greater than occlusal due to a very promi- nent cervical ridge Buccal outline is straight or slightly concave

Mesial Aspect Lingual outline is convex ML cusp is longer and sharper than MB cusp Cervical line is slightly curved toward occlusal

Mesial Aspect Marginal ride is shorter and less prominent

Distal Aspect Smaller than mesial aspect MR is less prominent Db cusp is longer and sharper than DL cusp

Distal Aspect Cervical line straight and slightly curved occlusally Cervical ridge is not so prominent

Overview of the Primary Dentition

Overview of the Primary Dentition Primary Maxillary Left First Molar

Overview of the Primary Dentition Tooth 54

Overview of the Primary Dentition MAXILLARY MOLARS MAX 1st Molar MAX 2nd Molar BUCCAL -little evidence of dev’t grooves -looks like a PREMOLAR -roots are slender,long, spread widely Distal root shorter -MBC DBC well defined, equal in size -roots are slender and longer than MAX 1st molar Lingual -MLC most prominent - MLC, DLC sometimes 5th cusp is seen. Proximal -DBC long and sharp -DLC poorly developed -typical molar outline Occlusal -Nearly RECTANGULAR -RHOMBOIDAL

Primary Mandibular Molars Overview of the Primary Dentition Primary Mandibular Molars 2 roots 2nd resembles the mandibular 1st permanent molar 1st does not resemble any other permanent or primary tooth!

Overview of the Primary Dentition

Overview of the Primary Dentition Tooth 84

Overview of the Primary Dentition

Overview of the Primary Dentition MANDIBULAR MOLARS MAND 1ST Molar MAND 2ND Molar Buccal 2 Buccal cusps are distinct but looks like a fusion of two teeth -similar to permanent 1st Molar -3 cusp portion almost equal in size Lingual -MMR well dev’d might be mistaken for another cusp - Li cusps equal in dimension Proximal -curvature of cervical line is distinct -flat and evenly tapered Occlusal -Rhomboidal -Rectangular

Overview of the Primary Dentition Summary Primary teeth have Thinner enamel and dentin layers Pulp horns closer to the outer surface Mesial pulp horn much higher Relatively large pulps Enamel rods directed slightly occlusal in cervical area More tortuous and irregular pulp canals

Overview of the Primary Dentition