Distalização do arco superior de acordo com o número de mini parafusos ortodônticos
Autor: Marlos Loiola | Publicado: 2017-01-24T06:00:00-03:00














Este artigo de 2012, publicado pelo Angle Orthodontist, pelos autores Till E. Bechtold; Jin-Wook Kim; Tae-Hyun
Choi; Young-Chel Park; Kee-Joon Lee. Do&nbsp; Department
of Orthodontics, College of Dentistry, Yonsei University, 134 Shinchon-dong,
Seodaemun-gu, Seoul, 120-752, South Korea. Apresenta um relato de caso de distalização
realizada com ancoragem esquelética. Avaliando e comparando a eficiência do uso
de um ou dois mini parafusos ortodônticos.



O presente trabalho aponta os
efeitos do(s) vetor(es) de força linear(es) dos mini parafusos
interradiculares na distalização do arco superior. Foram avaliados vinte e
cinco pacientes adultos com maloclusão de Classe II, leve a moderada e apinhamento
suave. &nbsp;Separados em dois grupos, foram
inseridos um (grupo A, n = 12) ou dois (grupo B, n = 13) mini parafusos &nbsp;na área interradicular posterior para fornecer
apoio para a mecânica de distalização. Os padrões de deslocamento dos incisivos
e molares superiores foram comparados.



Todos os pacientes utilizaram
aparelho da prescrição Roth com slot 0.018x0.025”. Após o alinhamento e
nivelamento inicial, foram instalados os ganchos bola no fio 0.016x0.022” de um
aço inoxidável para apoio das ligaduras elásticas. No grupo A, mini parafusos
de 7,0 mm de comprimento e 1,8 mm de diâmetro (Orlus 18107, Ortholution, Seoul,
Coreia) foram inseridos entre os segundos pré-molares e os primeiros molares
superiores.&nbsp; No grupo B, foram colocados
mini parafusos adicionais entre primeiros e segundos pré-molares superiores. Todos
os mini parafusos foram inseridos com angulação de 45º em relação ao plano
oclusal na junção mucogingival. Correntes elásticas (Ormco, Glendora, Calif)
foram aplicadas de cada mini parafuso aos ganchos bola ​​(TP Orthodontics, La
Porte, Ind) correspondentes, com uma magnitude de força de aproximadamente 200g
cada, significando 400g em cada lado do grupo B. As correntes elásticas foram
renovadas a cada 4 semanas.



Observou-se a distalização nos
molares e incisivos em ambos os grupos. No entanto, no grupo B houve maior
distalização e intrusão do primeiro molar e retração dos incisivos, assim como
significativa redução do plano mandibular, em comparação com a rotação do plano
oclusal no grupo A.



Concluíram que os mini-parafusos
interradiculares induziram, de forma previsível, a distalização total do arco
para correção da Classe II. Mini parafusos ortodônticos adicionais na área dos pré-molares
parecem facilitar a intrusão e distalização de todo o arco de acordo com a
posição dos vetores de força. (Angle Orthod. 2013; 83: 266-273.)



PALAVRAS-CHAVE: Arco maxilar;
Classe II; Interradicular; Miniscrew; Distalização



Link do artigo na integra:
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http://www.angle.org/doi/pdf/10.2319/032212-123.1



Créditos da Tradução a Dra&nbsp;Nathalia Torres