2 Dentition Dentition Arch Natural teeth in position in the dental arch. One row of teeth in the mouth.MaxillaryUpper teethMandibularLower teeth
3 Numbers of teeth Permanent Primary 32 total 20 total 16 each arch 20 succedaneousReplace baby teeth!Primary20 total10 each archNO pre-molarsNO 3rd molars
4 Quadrants Each arch is divided into R + L. Max. R. quadrant MidlineMax. R. quadrantURQMax. L. quadrantULQMan. L quadrantLLQMan. R quadrantLRQ
5 Sextants 6 sections of the mouth Maxillary Mandibular 3 of each archMaxillaryMax. R. Post. SextantMax. Anterior SextantMax. L. Post. SextantMandibularMand. L. Post. SextantMand. Anterior SextantMand. R. Post. Sextant
6 Tooth surfaces Anterior Posterior Proximal surfaces? Example Facial / LabialLingualMesialDistalIncisal edgePosteriorFacial / BuccalOcclusalProximal surfaces?Surfaces of adjacent teeth closest to each other.Mesial / DistalMidlineMesial / MesialExampleYou floss the proximal surfaces of a tooth.Your floss would be interproximal.Between the proximal surfaces.
7 Tooth Relationships Antagonistic (Antagonists) Adjacent Teeth that work together to chewSame tooth in the opposite arch.#1 and #32#14 and #19AdjacentTeeth next to each other in the same arch.#17 and #18
9 Tooth Morphology Contact point Diastema Where adjacent teeth touch each other.DiastemaAka open contactNaturally occurring ‘gap’ between teethCommon #8 #9Any 2 teeth/arch
10 Tooth Morphology Embrasure Cingulum Triangular space between the contact and the gingiva.CingulumLump of enamelLingual surface@ the gum line.Maxillary incisors
11 Tooth Morphology Lobes Cusp Underdeveloped cusps. Pointed or round mound of enamel.Form the ‘bumps’ on the chewing surface of molars and premolars.“cuspid”!
12 Tooth Morphology Fossa Developmental groove. Round Triangular Linear “low spot” /recessed areaOn a surfaceBetween cusps or ridges.Developmental groove.Linear“low spot” / recessed areaUsually occlusal surfaceBetween cusps
13 Tooth Morphology Fissure Pit Imperfect union of cusps Appears as a small “crack”Located at the bottom of a developmental groovePitWhere fissures cross or end.Sealants are placed in pits and fissures to prevent decay.
14 Tooth Morphology Mamelons Cusp of Carabelli 3 small cusps Incisal edgeNewly erupted incisors.Wear down w/ use.Cusp of Carabelli5th/ additional cuspLingual surfaceMaxillary 1st molars#3 + #14
15 Tooth Morphology Ridges Marginal ridges Elevated lines of enamel between cusps.Many examplesMarginal ridgesForm the mesial + distal borders of the tooth.Extend between the buccal and lingual cusps
16 Tooth Morphology Crown Root(s) Apex Apical foramen Top of the tooth Covered w/ enamelRoot(s)Bottom of the toothCovered w/ cementumApexEnd of the rootApical foramenapex
17 Tooth Morphology Furcation Dividing point of roots Bifurcation Of a multi-rooted toothBifurcation2 rootsTrifurcation3 rootsFurcation
18 Tooth tissue junctions CEJCementoenamel junctionWhere enamel meets cementum.Around the outside of the tooth.DEJDentinoenamel junctionWhere enamel meets the dentin.Under the enamel
19 Permanent Tooth descriptions! Max. Cent. IncisorsNumbers: 8, 9# of roots: 1Nerve: ASAType of injection:InfiltrationSuccedaneous: yesReplaces E and FFunctionCutMax. Lat. Incisors7, 101 rootsASAInfiltrationSuccedaneous: yesReplaces: D, GMost anomalies.FunctionCut
28 Naming a Tooth! Arch 1st Side 2nd Position 3rd Type of tooth 4th Max or MandSide 2ndRight / leftPosition 3rdCentral / Lateral1st / 2nd / 3rdType of tooth 4thMolar / premolar / cuspid / incisorExamplesPermanent teeth#2Max R. 2nd Molar#21Mand L. 1st PremolarPrimary teeth#BMax R. 1st primary molar
29 ConclusionKnowing your tooth names and numbers is critical to being a successful dental assistant.Understanding morphology terminology will make it easier to communicate with your dentist.Do you have any questions?