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1、,PPT汇编实用可编辑,20XX年X月,整理自网络,Orthodontic diagnosis: The development of a Problem List,Operator : Zhou Ling Supervisor: Prof. Li Date: 2013.6.6,2,精品ppt实用借鉴,1,5,3,4,Development of a Problem List,The Problem-Oriented approach,Clinical Evaluation,Analysis of Diagnostic Records,Orthodontic Classification,Ch
2、apter outline,2,3,精品ppt实用借鉴,Analysis of Diagnostic Records,Cephalometric analysis of dentofacial relationships,Dental cast analysis,to evaluate space excess or deficiency and symmetry within the dental arches,4,精品ppt实用借鉴,Symmetry Space analysis Estimating of unerupted permanent teeth Tooth size anal
3、ysis,Dental cast analysis,5,精品ppt实用借鉴,Symmetry,Transparent ruled grid placed over dental cast Oriented to the midpalatal raphe Spot asymmetries in arch form , and tooth position,6,精品ppt实用借鉴,Lateral drift of incisors (Crowding, C lost 3 blocked out),Symmetry,Drift of posterior teeth （Early loss of E)
4、,7,精品ppt实用借鉴,Pendulum,8,精品ppt实用借鉴,Symmetry Space analysis Estimating of unerupted permanent teeth Tooth size analysis,Dental cast analysis,9,精品ppt实用借鉴,Alignment (Crowding): Space Analysis,10,精品ppt实用借鉴,Dental cast,Computer algorithm,Space Analysis,11,精品ppt实用借鉴,Measuring arch perimeter from the mesial
5、 of one first molar to the other, over the contact points of posterior teeth and incisal edge of anteriors.,Step one: Calculation of available space,片段法,铜丝法,12,精品ppt实用借鉴,Step two: Calculation of required space,Measure the mesiodistal width of each erupted tooth from contact point to contact point.,1
6、3,精品ppt实用借鉴,Space Analysis,14,精品ppt实用借鉴,01,The space available will not change because of growth.,02,All the teeth are normal in size,03,Correct anteroposterior position of incisors,Three assumptions,15,精品ppt实用借鉴,Interaction,Protrusion,Retrusion,Crowding,16,精品ppt实用借鉴,Crowding and protrusion are diff
7、erent aspects of the same phenomenon. If there is not enough room to properly align the teeth, the result can be crowding, protrusion, or (most likely) some combination of the two.,17,精品ppt实用借鉴,18,精品ppt实用借鉴,19,精品ppt实用借鉴,20,精品ppt实用借鉴,01,The space available will not change because of growth.,02,All th
8、e teeth are normal in size,03,Correct anteroposterior position of incisors,Three assumptions,21,精品ppt实用借鉴,In a child with a well-proportioned face, there is little or no tendency for the dentition to be displaced relative to the jaw during growth. But the teeth often shift anteriorly or posteriorly
9、in a child with a jaw discrepancy.,22,精品ppt实用借鉴,23,精品ppt实用借鉴,01,The space available will not change because of growth.,02,All the teeth are normal in size,03,Correct anteroposterior position of incisors,Three assumptions,24,精品ppt实用借鉴,Symmetry Space analysis Estimating of unerupted permanent teeth To
10、oth size analysis,Dental cast analysis,25,精品ppt实用借鉴,Mix Dentition Estimating of Unerupted Permanent Teeth,26,精品ppt实用借鉴,Estimating of Unerupted Permanent Teeth,27,精品ppt实用借鉴,Undistorted radiographic image,Compensate for enlargement,Measurement of the teeth on radiographs,28,精品ppt实用借鉴,True width of pri
11、mary molar Apparent width of primary molar,Measurement of the teeth on radiographs,True width of unerupted Premolar Apparent width of unerupted premolar,=,29,精品ppt实用借鉴,Accuracy is fair to good depending on the quality of the radiographs and their position in the arch. The technique can be used in ma
12、xillary and mandibular arches for all ethnic groups.,Measurement of the teeth on radiographs,30,精品ppt实用借鉴,Estimating of Unerupted Permanent Teeth,31,精品ppt实用借鉴,Moyers prediction,Estimation from proportionality tables,Measuring the mesiodistal width of the lower incisors,Prediction the size of both th
13、e lower and upper unerupted canines and premolars,32,精品ppt实用借鉴,Estimation from proportionality tables,33,精品ppt实用借鉴,Northern European white children No radiographs are required , used for the upper or lower arch.,Estimation from proportionality tables,34,精品ppt实用借鉴,Estimation from proportionality tabl
14、es,35,精品ppt实用借鉴,Estimating of Unerupted Permanent Teeth,36,精品ppt实用借鉴,Combination of radiographic and prediction table,It depends!,37,精品ppt实用借鉴,Comparison,Moyers,Takana & Johnston,Northern European white children No radiographs,Depending on the quality of the radiographs and their position in the arc
15、h For all ethnic groups.,38,精品ppt实用借鉴,Symmetry Space analysis Estimating of unerupted permanent teeth Tooth size analysis,Dental cast analysis,39,精品ppt实用借鉴,Although the natural teeth match very well in most individuals, approximately 5% of the population have some degree of disproportion among the s
16、izes of individual teeth. - Tooth Size Discrepancy(TSD),Tooth Size Analysis,40,精品ppt实用借鉴,Tooth Size Analysis,41,精品ppt实用借鉴,Bolton Ratio,Tooth Size Analysis,(78.8 1.72)% (91.5 1.51)%,42,精品ppt实用借鉴,A quick check for . Anterior tooth size discrepancy : 2 2 Posterior tooth size discrepancy： 5 = 5 A tooth size discrepancy of less than 1.5mm is rarely significant.,Tooth Size Analysis,43,精品ppt实用借鉴,Symmetry Space analysis Estimating of unerupted permanent teeth Tooth siz
