Dental Anatomy Introduction PDF

Lec:1 Introduction MH 1  Introduction to Dental Anatomy Dental Anatomy It includes the external morphology and internal composition of the individual teeth, the relationship of the teeth to each other and to the skul...

Lec:1 Introduction MH 1  Introduction to Dental Anatomy Dental Anatomy It includes the external morphology and internal composition of the individual teeth, the relationship of the teeth to each other and to the skull. Types of teeth Incisors Canine Premolars Molars two teeth in One tooth in Two in each quadrant in -Three in each quadrant in each quadrant each quadrant permanent dentition permanent dentition Total=8 Total=4 Total=8 Total=12 zero in deciduous dentition. -two in each quadrant in deciduous dentition. Total=8 They are named It also is called They are also called bicuspids They are named first, second central and a cuspid and third molars lateral incisors Anterior teeth Posterior teeth For knowledge Maxillary or upper teeth Quadrant = ‫ربع‬ upper right quadrant upper left quadrant Mandibular or Lower teeth Lower right quadrant Lower left quadrant ‫ كل ربع فيهم فيه نفس عدد ونوعية االسنان زي الباق‬، ‫لو قسمنا االسنان ليمين وشمال بعدين لفوق وتحت هينتج عندنا اربع ترباع‬ MH 2  Deciduous/Primary Dentition Mixed Dentition Period (6 to 12 Permanent/Secondary/Succedaneous ` Years) Dentition -The first set of teeth to appear in -Mixed dentition stage is a -There are a total of 32 teeth in the the oral cavity. transition period when primary permanent dentition, 16 in each jaw. -The primary teeth are sometimes teeth are exfoliated in a sequential -Incisors, canine, premolars and molars. also referred to as milk teeth/baby manner, followed by the eruption -The permanent teeth are also called as teeth/predessessor. of their permanent successors. succedaneous teeth/secondary teeth -The primary dentition consists of a -This stage lasts from 6 to 12 years since they replace or succeed the total of 20 teeth, 10 in each jaw. of age. primary teeth. -Incisors, canine and molars. “no -Both primary and permanent teeth -The permanent teeth begin to erupts premolar” are present during this period. at 6 years of age and gradually replace -The primary teeth begin to erupt -The mixed dentition period begins the smaller primary teeth. into the oral cavity at about 6 with the eruption of permanent -The eruption process is completed by months of age and are being first molars and mandibular central 12 to 13 years except for the 3rd molars completed at the age of 2½ to 3 incisors. which erupt around 18 to 25 years of years. -It ends when the last primary age. tooth is shed. -There are 32 permanent teeth, but only 20 teeth in the primary dentition. -Thus, there are 12 permanent molars that erupt into oral cavity but do not replace any primary teeth. Mixed Dentition MH 3 why Permanent teeth are 32 while primary teeth are only 20? because adults have bigger jaws than kids primary central incisor → Permanent central incisor primary lateral incisor → Permanent lateral incisor primary canine → Permanent canine succedenuous primary 1st molar → Permanent 1 st premolar primary 2nd molar → Permanent 2 nd premolar Permanent 1st Molar Permanent 2nd Molar non-succedenuous Permanent 3rd Molar MH 4  Maxilla upper jaw is fixed upper or maxillary jaw lower jaw is movable Mandible lower or mandibular jaw Dental formula: A number and letter designation of the various types of teeth found in a dentition. -It indicates the dentition of only one side of the mouth, but includes upper and lower teeth, so dental formula includes just half of the teeth Dental formula for Deciduous Dental formula for Permanent teeth teeth Numbering system It is used to serve as abbreviations instead of writing the entire name of a tooth. These symbols will let us know the tooth is either: 1-Deciduous or permanent. 2-Upper or lower. 3-Right or left. 4-The tooth name. There are 3 numbering or notation systems: A. Palmer numbering system. B. International (two digit) system. C. Universal numbering system. MH 5  Palmer Notation system International (two digit) system Universal numbering system -The system used simple bracket to -The first number identifies the quadrant, and It employs a different number (1-32) in a represent the four quadrants of the whether the tooth is permanent (1-4) or deciduous consecutive arrangement for all permanent teeth, dentition. (5-8); starting from upper right side. and a number-letter (1d-20d) for each of the -The second number identifies the particular tooth deciduous teeth. -The number is always preceded in the quadrant, exactly like the Palmer notation by the sign # to designate that the system is used method for permanent teeth (1-8). The deciduous for universal system. teeth in each quadrant are numbered (1-5) Permanent teeth Permanent teeth Permanent Teeth -The permanent teeth are numbered from the universal numbering system assigns a specific 1-8 on each side starting from midline. number to each permanent tooth starting from -So, number 1 will be for central incisor, the upper right third molar is #1 and continues while 8 will be for 3 rd molar. around the entire mandibular arch where the lower right third molar is #32. R L Deciduous teeth Deciduous teeth Deciduous Teeth start also from midline. But for deciduous The 20 teeth of the deciduous dentition are teeth we give alphabetic letters. numbered in the same manner as are the -From deciduous central incisor A, ending permanent teeth (1-20), except that a small (d). The with deciduous second molar E. deciduous upper right second molar is thus #1d. -Each quadrant has only 5 teeth. R L MH 6 The most common system in use today for designating deciduous teeth uses the capital letters A through T. The maxillary right deciduous second molar is tooth A, so that the mandibular right deciduous second molar is tooth T. MH 7