The Contrastive Analysis Of 3D Digital Model Measurements For Skeletal Type ?,? Of Angel ? Malocclusion

Objective:This study by measuring analyzing system and the 3shape digital 3D scanner,of permanent dentition class ? skeletal type ?, skeletal type ? 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 ? 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 ? skeletal type I select30 cases, class ? skeletal ? in 30 cases, average age 19.2±2.1 years old, ethnic Han.Research on individual normal occlusion sample and class ? 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 ? skeletal type I, skeletal type ? 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: ? type >?type> INO(P<0.05).2. Dental arch measurements: Maxillary dental arch length: INO >?type>?type(P<0.05). Mandibular dental arch length: ? type >?type> 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): ? type >?type> INO(P<0.05);(3)behind section(6-6): ? type >?type> INO(P<0.05); Mandibular dental arch width:(1)front section(3-3): no statistical significance(P>0.05);(2)middle section(4-4): ? type <?type< INO(P<0.05);(3)behind section(6-6): ? type<?type< INO(P<0.05).3. Basal bone measuring result: Maxillary basal bone length: ? type < INO<?type(P<0.05); Mandibular basal bone length: ? type >?type> INO(P<0.05);Maxillary basal bone width:(1)front section(3-3): no statistical significance(P>0.05);(2)middle section(4-4): ? type >?type> INO(P>0.05),the difference had no statistical significance;(3)behind section(6-6): ? type >?type> INO(P<0.05);Mandibular basal bone width:(1)front section(3-3): no statistical significance(P>0.05);(2)middle section(4-4): ? type <?type< 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):? type >?type>INO(P<0.05);Maxillary behind section(6-6): ? type >?type> INO(P<0.05);(2)Mandibular middle section(4-4):? type <?type< INO(P<0.05); Mandibular(3)behind section(6-6): ? type <?type< 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: ?type <?type< INO(P<0.05);(2)palatine curve width: ? type >?type> 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): ? type < INO <?type(P<0.05); mandibular anterior teeth(sagittal):? type >?type> INO(P<0.05);(2)maxillary molars(coronary): ?type <?type< INO(P<0.05); mandibular molars(coronary): ? type >?type> INO(P<0.05). There is no obvious statistical differences for the rest teeth(P>0.05).Conclusion:1. Skeleton?type,? type Spee curvature both greater than INO,? type compared with?type curvature is more obvious.2.Skeleton? type maxillary dental arcade?basal bone arch length both shorter than ?type,?type?? type mandibular dental arcade?basal bone arch length both longer than INO. The maxillary dental arcade and basal bone arch length of ? type is shorter than ?type, mandibular dental arcade?basal bone arch length showed the opposite way.3. Skeleton?type,? type behind section of maxillary dental arcade?basal bone arch both wider than INO, ? type is the widest among the three. ?type,? type middle and behind section of mandibular dental arcade narrower than INO, ? type narrower than?type;? type middle section of mandibular basal bone narrower than?type.4.Skeleton?type,? type middle and behind section of maxillary WALA ridge interval both wider than INO,?type,? type mandibular WALA ridge interval narrower than INO, ? type is the most narrowest, consistent with the trend of dental arch width.5.Skeleton?type,? type palatine curve length both shorter than INO, ? type shorter than ?type. ?type,? type palatine curve both wider than INO, ? type wider than ?type. All of these consistent with the trend of maxillary dental arch length and width.6. Skeletal type ? than type?upper anterior teeth obviously lip incline, lower anterior teeth obviously tongue to tilt, maxillary posterior buccoclination,mandibular molar linguoclination.