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'n Ondersoek na die verband tussen die grootte van die sentrale maksill^ere diasteem en die moontlike ontstaan van anterior kruisbyt van die laterale maksill^ere snytande

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dc.contributor.advisor de Muelenaere JJGG, Prof en
dc.contributor.author Van Heerden PW en
dc.date.accessioned 2016-09-26T06:00:48Z
dc.date.available 2016-09-26T06:00:48Z
dc.date.submitted 1988 en
dc.identifier.uri http://hdl.handle.net/20.500.11892/162906
dc.description.abstract No definite treatment regime exists for the management of the central maxillary diastema. Although the diastema usually closes spontaneously with the eruption of the maxillary lateral incisors, an anterior crossbite can also develop in this stage of development of the occlusion. If it can be shown that there is a relationship between the size of the central maxillary diastema and the development of an anterior crossbite of the maxillary lateral incisors, a definite treatment regime can be formulated to deal with this problem. A selected group of White boys and girls (between ages 6-10 years) were evaluated. The central maxillary diastema was present in each case. These children were all resident in the Hoedspruit area. Impressions for study models were taken every 6 months for a period of 2 years and certain parameters measured, using a vernier measuring gauge and a feeler gauge. Four anatomical landmarks namely A, C, M and 6 were identified. With regard to these landmarks 4 sublandmarks MX, MD, 1, 2, 3 and 4 were identified, representing respectively the maxilla, the mandible, and the four quadrants, according to the FDI classification. Landmark A is in the middle of the embrasure space, on the crest of the interdental papilla between the upper centrals, AMX is the crest of the maxillary papilla and AMD the crest of the mandibular central papilla. Landmark C is distal to the primary canine, in line with its central fissure, and is situated on the maximum convexity of the distal aspect. C is identified for each quadrant, (C-<sub>1</sub>-C<sub>4</sub>. Landmark M is situated on the distal convexity of the second primary molar (subject to the same criteria as that for C). Landmark 6 corresponds to the highest point of the mesio-buccal cusp of the first permanent molar. The following measurements were used as parameters: 1. the size of the central maxillary diastema 2. the mesio-distal width of all permanent incisors 3. measurement A - C for each quadrant 4. measurement C - M for each quadrant 5. C<sub>1</sub> - C<sub>2</sub>, C<sub>3</sub> - C<sub>4</sub>, 6<sub>1</sub> - 6<sub>2</sub> and 6<sub>3</sub> - 6<sub>4</sub> 6. the perpendicular distance from C<sub>1</sub> - C<sub>2</sub> and 6<sub>1</sub> - 6<sub>2</sub> with regard to AMX 7. the perpendicular distance from C<sub>3</sub> - C<sub>4</sub> and 6<sub>3</sub> - 6<sub>4</sub> to AMD All these parameters were statistically examined. The results obtained indicate that the mesio-distal measurements of the incisors of both groups corresponded with normal average values. Girls completed the development of the early mixed dentition at a significantly earlier age than do boys, the figures being 9,7 years for boys and 9,1 years for girls (p = 0,0355; Wilcoxon test). Anterior crossbites were observed only in children with a class I molar relationship and in these cases there are a significant difference in the degree of overbite, with regard to children with a class II molar relationship (p = 0,0499; Wilcoxon test). Correlation could be shown with regards to the sex and age of the children, using the Pearson correlation coefficient test. A negative correlation between the size of the central diastema and the measurement C<sub>1</sub>C<sub>2</sub> - AMX was observed. A positive correlation between the size of the diastema and the difference in measurements 6<sub>1</sub> - 6<sub>2</sub> and 6<sub>3</sub> - 6<sub>4</sub> was found. The study failed to show the existence of a statistically significant relationship between the size of the central maxillary diastema and the development of an anterior crossbite of the maxillary lateral incisors. However, could the crossbite group be enlarged, a statistically significant relationship may be a distinct possibility. en
dc.language Afrikaans en
dc.subject Medical sciences: Surgery en
dc.subject Dentistry en
dc.title 'n Ondersoek na die verband tussen die grootte van die sentrale maksill^ere diasteem en die moontlike ontstaan van anterior kruisbyt van die laterale maksill^ere snytande en
dc.type Masters degree en
dc.description.degree MDent en


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