| Objective:This study by measuring analyzing system and the 3shape digital 3D scanner,of permanent dentition class Ⅲ skeletal type Ⅰ, skeletal type Ⅲ dental plaster models of measurement, through the statistical analysis of the differences and to explore the wrong tooth malocclusion in the characteristics of maxilla and dental arch and teeth,orthodontic, jaw clinical treatment provide a reference.Methods:Screening of individual normal occlusion(abbreviation: INO) samples:45 cases of individual nomal occlusiom were selected in the general physical examination of tianjin university entrant, including 15 casws of males and 30 cases of females,average age 18.2±1.3 years old, ethnic Han.Screening of class Ⅲ patient samples: Select 2010-2015 years in Tianjin Medical University School of Stomatology Department of orthodontics treatment of patients, according to the sample inclusion criteria for class Ⅲ skeletal type I select30 cases, class Ⅲ skeletal Ⅲ in 30 cases, average age 19.2±2.1 years old, ethnic Han.Research on individual normal occlusion sample and class Ⅲ samples use alginate impression materials preparation of female die, plaster model, using 3shape R700 scanner gypsum model scanning for three-dimensional digital model.According to the pre selected measurement items, the digital model of the digital model was measured by using the software Ortho Analyzer 2013. Using SPSS 19.0software respectively on individual normal occlusion data and class Ⅲ skeletal type I, skeletal type Ⅲ data were statistically analyzed. Between the two two groups, the three groups were compared by using the variance analysis LSD method, and the test standard was 0.05.Results:1. Jaw measurement results:(1)full Bolton rate、anterior Bolton rate: The differences among three groups have no statistical significance(P>0.05).(2)Spee curve: Ⅲ type >Ⅰtype> INO(P<0.05).2. Dental arch measurements: Maxillary dental arch length: INO >Ⅰtype>Ⅲtype(P<0.05). Mandibular dental arch length: Ⅲ type >Ⅰtype> INO(P<0.05).Maxillary dental arch width:(1)front section(3-3):The difference had no statistical significance(P>0.05);(2)middle section(4-4): Ⅲ type >Ⅰtype> INO(P<0.05);(3)behind section(6-6): Ⅲ type >Ⅰtype> INO(P<0.05); Mandibular dental arch width:(1)front section(3-3): no statistical significance(P>0.05);(2)middle section(4-4): Ⅲ type <Ⅰtype< INO(P<0.05);(3)behind section(6-6): Ⅲ type<Ⅰtype< INO(P<0.05).3. Basal bone measuring result: Maxillary basal bone length: Ⅲ type < INO<Ⅰtype(P<0.05); Mandibular basal bone length: Ⅲ type >Ⅰtype> INO(P<0.05);Maxillary basal bone width:(1)front section(3-3): no statistical significance(P>0.05);(2)middle section(4-4): Ⅲ type >Ⅰtype> INO(P>0.05),the difference had no statistical significance;(3)behind section(6-6): Ⅲ type >Ⅰtype> INO(P<0.05);Mandibular basal bone width:(1)front section(3-3): no statistical significance(P>0.05);(2)middle section(4-4): Ⅲ type <Ⅰtype< INO(P<0.05);(3)behind section(6-6): the difference had no statistical significance(P>0.05).4. WALA ridge interval:(1)Maxillary middle section(4-4):Ⅲ type >Ⅰtype>INO(P<0.05);Maxillary behind section(6-6): Ⅲ type >Ⅰtype> INO(P<0.05);(2)Mandibular middle section(4-4):Ⅲ type <Ⅰtype< INO(P<0.05); Mandibular(3)behind section(6-6): Ⅲ type <Ⅰtype< INO(P<0.05). Front section of WALA ridge interval had no statistical differences(P>0.05).5. The comparison results of the measured palatine:(1)palatine curve length: Ⅲtype <Ⅰtype< INO(P<0.05);(2)palatine curve width: Ⅲ type >Ⅰtype> INO(P<0.05);(3)palatal vault height: no statistical significance(P>0.05).6.The angle of tooth long axis and plane(palatal lingual) :(1) maxillary anterior teeth(sagittal): Ⅲ type < INO <Ⅰtype(P<0.05); mandibular anterior teeth(sagittal):Ⅲ type >Ⅰtype> INO(P<0.05);(2)maxillary molars(coronary): Ⅲtype <Ⅰtype< INO(P<0.05); mandibular molars(coronary): Ⅲ type >Ⅰtype> INO(P<0.05). There is no obvious statistical differences for the rest teeth(P>0.05).Conclusion:1. SkeletonⅠtype,Ⅲ type Spee curvature both greater than INO,Ⅲ type compared withⅠtype curvature is more obvious.2.SkeletonⅢ type maxillary dental arcade、basal bone arch length both shorter than Ⅰtype,Ⅰtype、Ⅲ type mandibular dental arcade、basal bone arch length both longer than INO. The maxillary dental arcade and basal bone arch length of Ⅲ type is shorter than Ⅰtype, mandibular dental arcade、basal bone arch length showed the opposite way.3. SkeletonⅠtype,Ⅲ type behind section of maxillary dental arcade、basal bone arch both wider than INO, Ⅲ type is the widest among the three. Ⅰtype,Ⅲ type middle and behind section of mandibular dental arcade narrower than INO, Ⅲ type narrower thanⅠtype;Ⅲ type middle section of mandibular basal bone narrower thanⅠtype.4.SkeletonⅠtype,Ⅲ type middle and behind section of maxillary WALA ridge interval both wider than INO,Ⅰtype,Ⅲ type mandibular WALA ridge interval narrower than INO, Ⅲ type is the most narrowest, consistent with the trend of dental arch width.5.SkeletonⅠtype,Ⅲ type palatine curve length both shorter than INO, Ⅲ type shorter than Ⅰtype. Ⅰtype,Ⅲ type palatine curve both wider than INO, Ⅲ type wider than Ⅰtype. All of these consistent with the trend of maxillary dental arch length and width.6. Skeletal type Ⅲ than typeⅠupper anterior teeth obviously lip incline, lower anterior teeth obviously tongue to tilt, maxillary posterior buccoclination,mandibular molar linguoclination. |
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