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Previous issue date: 2018-01-24 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / The Nance lingual arch is widely used in preventive and interceptive orthodontics, and its main objective is to maintain lower arch length in cases of premature loss of deciduous teeth or mild to moderate crowding during the change from a mixed dentition to permanent dentition. Objectives: To perform a literature review addressing aspects related to the uses of the lingual arch and its effect on the dentition, as well as to evaluate and compare the effect of the lingual arch in patients with vertical and horizontal growth patterns. Materials and methods: Linear and angular measurements were performed using cephalograms of 41 patients (21 horizontal and 20 vertical patients) after the use of the lingual arch for a period of 12 ? 3 months. A control sample of 21 patients was used to compare the effect of the lingual arch. The Kolmogorov-Smirnov normality test and Student's T test for dependent samples to compare before and after treatment were used. Student's T-test for independent samples was used to compare experimental group vs. control group and vertical vs. horizontal patients. In order to evaluate the reliability of the measurements, the Intraclass Correlation Coefficient (ICC) was calculated. The measures evaluated were: angular incisor, angular molar, angular second molar; vertical molar, vertical incisor, arch length and sagittal displacement of the incisor and molar. Results: The control group had a decrease in arch length of 1 ? 1.2 mm and the experimental group lost only 0.2 ? 1 mm (p = 0.01). There were no significant differences between experimental group and control for the other measures. When comparing vertical and horizontal patients, the only measure that showed statistically significant diference was the angular second molar. The lower second molars showed distal inclination in the horizontal type and a mesial inclination in the vertical type (p <0.05). Conclusion: The lingual arch was effective to control arch length during the study period. There was no difference in the effect of lingual arch between vertical and horizontal patients, except for second molar angulation. Mesial angulation of the second molar is related to greater chance of impaction. Vertical patients during the use of the lingual arch need to be monitored regarding the risk of impaction of the second permanent molar. / O arco lingual de Nance ? muito utilizado na Ortodontia preventiva e interceptativa, tendo como objetivo principal a manuten??o do comprimento do arco inferior em casos de perda precoce e/ou apinhamento leve a moderado durante a troca da denti??o mista para a permanente. Objetivos: Realizar uma revis?o de literatura abordando aspectos relacionados ? indica??o do arco lingual e seu efeito sob a denti??o, bem como avaliar e comparar o efeito do mesmo em pacientes com padr?es de crescimento vertical e horizontal. Materiais e m?todos: Foram realizadas medidas lineares e angulares atrav?s de telerradiografias de perfil em 41 pacientes (21 horizontais e 20 verticais) ap?s o uso do arco lingual por um per?odo de 12?3meses. Uma amostra controle de 21 pacientes foi utilizada para compara??o do efeito do arco lingual. Foram aplicados o teste de normalidade Kolmogorov-Smirnov e teste T de Student para amostras dependentes para comparar antes e ap?s tratamento e teste T de Student para amostras independentes para comparar grupo controle ao experimental e pacientes verticais aos horizontais. Para avalia??o da confiabilidade das medidas foi calculado o Coeficiente de Correla??o Intraclasse. As medidas avaliadas foram: angula??o do incisivo, angula??o do primeiro e segundo molares permanentes; extrus?o dos incisivo e primeiro molar, comprimento do arco e deslocamento sagital do incisivo e molar. Resultados: Pacientes do grupo controle apresentaram diminui??o do comprimento do arco de 1?1,2mm e pacientes do grupo experimental perderam somente 0,2?1mm (p=0.01). N?o houve diferen?as significativas entre grupo experimental e controle para as demais medidas. Ao comparar pacientes verticais e horizontais, as ?nicas medidas com diferen?a estat?stica foram angula??o do segundo molar. Os segundos molares inferiores apresentaram inclina??o distal no tipo horizontal e inclina??o mesial no tipo vertical (p<0,05). Conclus?o: O arco lingual foi efetivo para manter o comprimento do arco durante o per?odo do estudo. N?o houve diferen?a do efeito entre pacientes verticais e horizontais, exceto para angula??o do segundo molar. Angula??o mesial do segundo molar est? relacionada ? maior chance de impac??o. Pacientes verticais durante o uso do arco lingual precisam ser monitorados em rela??o ao risco de impac??o do segundo molar permanente.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/8132 |
| Date | 24 January 2018 |
| Creators | Schenck, Vanessa Kern Soares |
| Contributors | Lima, Eduardo Martinelli de |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Odontologia, PUCRS, Brasil, Escola de Ci?ncias da Sa?de |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -8096554818733665164, 500, 500, 600, -2070498469879244349, 2075167498588264571 |
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