3.Approximately the same depth of curvature on adjacent proximal surfaces of adjacent teeth.4.Depth of the curvature on all surfaces decreases from anteriorto posterior.Gingival Line (gingival crest, gingival margin): Imaginary line, which marks the level of termination ofsoft tissue surrounding the tooth. Separates clinical crownand root. Variable.Epithelial attachment: Attachment of the soft tissue of the mouth to the tooth. Seals the soft tissue tothe tooth. Variable in location. Tendency to migration apically during life moving from enamel tocementum. Normal attachment follows the curvature of CEJ.Periodontal ligament: Attachment of hard tissue (bone)to the tooth’s root structure.Root shape and number:Shape, length and number related to tooth’s form and function.Canines: Longest and strongest tooth in both arches. Function as fang.Molars: Multicoated. Increased side of occlusal table. Function as grinder.1.Roots are widest toward the cervical area. Taper towards apex.2.Anterior teethand premolarsgenerally have one root.3.Maxillary molarsnormally possess three roots(one lingual, two buccal).4.Mandibular molarsnormally have two roots (one medial, one distal).TeethIncisors: First and second teeth from the midline.
Morien 12Develop from 4 lobes(3 labial, 1 lingual)Function: Mastication, esthetics, phonetics and anterior guidance.Class Traits:oIncisal 2/3 of crown appears flattened. Gives horizontal biting edge.oMamelons– Rounded protuberances on incisal ridge of newly erupted incisors.oFrom facial view crowns are trapezoidal– longer inciso-cervically than mesio-distally and taper from contact to cervical line.oFrom facial crownoutlines on distal are more convexthan on mesial(except for mandibular central).oFrom Facial mesio-incisal anglesare more acutethan disto-incisal angles.oFrom incisal view, facial outlines are less convexthan lingual outlines.Permanent Maxillary Central IncisorMesial ContactCentral IncisorDistal ContactLateral IncisorUniversal Annotation8 and 9International Annot.1-1 and 2-1Start Calcification3 - 4 MOCrown Completed4 – 5 YOEruption7 – 8 YORoot Completion10 YOOverall Length23.0 mmCrown Height10.0 mmM-D Diameter8.5 mmFa-Li Diameter7.0 mmCurvature of CL3.5 mm Mesially2.5 mm DistallyMesial COCIncisal thirdDistal COCJCT mid/incisal thirdFacial COCCervical thirdLingual COCCervical thirdInclination Lingual28°Inclination Mesial2°Facial OutlineTrapezoidalLingual OutlineTrapezoidalMesial OutlineIsosceles TriangleDistal OutlineTriangular Permanent Maxillary Lateral IncisorMesial ContactCentral IncisorDistal ContactCanineUniversal Annotation7 and 10International Annot.1-2 and 2-2Start Calcification1 YOCrown Completed4 – 5 YOEruption8 – 9 YORoot Completion11 YOOverall Length22.0 mmCrown Height8.8 mmM-D Diameter6.5 mmFa-Li Diameter6.0 mmCurvature of CL3.0 mm Mesially2.0 mm DistallyMesial COCIncisal thirdDistal COCMiddle ThirdFacial COCCervical thirdLingual COCCervical thirdInclination Lingual26°Inclination Mesial7°Facial OutlineTrapezoidalLingual OutlineTrapezoidalMesial OutlineIsosceles TriangleDistal Outline