Cephalometric evaluation of symmetric and asymmetric extraction treatment for patients with Class II subdivision malocclusions

Janson, Guilherme; Carvalho, Paulo Eduardo Guedes; Cançado, Rodrigo Hermont; Freitas, Marcos Roberto de; Henriques, José Fernando Castanha

doi:10.1016/j.ajodo.2005.07.024

Cited by 26 publications

(57 citation statements)

References 24 publications

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“…Asymmetric extraction treatment provides an easier mechanics and better occlusal treatment success rate when compared to four premolar extractions [37] and less mandibular incisor and soft tissue retraction [38]. A variation of asymmetric extraction therapy in Class II malocclusions may include only one premolar extraction [39].…”

Section: Discussionmentioning

confidence: 99%

Frequency evaluation of different extraction protocols in orthodontic treatment during 35 years

2014

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BackgroundStudies that show frequencies of different orthodontic treatment protocols can be used as valuable parameters in the interpretation of treatment tendency with time. The purpose of this retrospective study was to evaluate all orthodontic treatment planning conducted at the Orthodontic Department at Bauru Dental School, University of São Paulo, Brazil, since 1973, in order to investigate extraction and non-extraction protocol frequencies selected at each considered period.MethodsThe sample comprised 3,413 records of treated patients and was evaluated according to the protocol choice, divided into 10 groups: Protocol 0 (non-extraction); Protocol 1 (four first premolar extractions); Protocol 2 (two first maxillary and two second mandibular premolars); Protocol 3 (two maxillary premolar extractions); Protocol 4 (four second premolars); Protocol 5 (asymmetric premolar extractions); Protocol 6 (incisor or canine extractions); Protocol 7 (first or second molar extractions); Protocol 8 (atypical extractions) and Protocol 9 (agenesis and previously missing permanent teeth). These protocols were evaluated in seven 5-year intervals: Interval 1 (1973 to 1977); Interval 2 (1978 to 1982); Interval 3 (1983 to 1987); Interval 4 (1988 to 1992); Interval 5 (1993 to 1997); Interval 6 (1998 to 2002); Interval 7 (2003 to 2007). The frequency of each protocol was compared between the seven intervals, using the proportion test (P < 0.05).ResultsThe results showed that 10 protocol frequencies were significantly different among the 7 time intervals.ConclusionsThe non-extraction protocol frequency increased gradually with consequent reduction of extraction treatments. The four premolar extraction protocol frequency decreased gradually while the two maxillary premolar extraction protocol has maintained the same frequency of indications throughout time.

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Section: Discussionmentioning

confidence: 99%

Frequency evaluation of different extraction protocols in orthodontic treatment during 35 years

2014

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“…On the other hand, extraction of two upper premolars and only one lower premolar (opposite to the midline deviation) results in asymmetrical molar relationship at the end of the treatment (Class I and Class II). [10][11][12][13]21,27 Thus, in these situations it would be easier to achieve midline correction and obtain better vertical control. Treatment considering three premolars extraction protocol in Class II subdivision cases requires less treatment time, providing more satisfactory results.…”

Section: Literature Review and Discussionmentioning

confidence: 99%

“…Treatment considering three premolars extraction protocol in Class II subdivision cases requires less treatment time, providing more satisfactory results. 10,12 Janson et al 10 also state that the asymmetric extraction protocol is best suited for promoting minor changes in the profile. However, the authors described an extrusion of lower incisors in cases treated with three premolars extraction protocol and affirmed that better vertical control of the anterior teeth is accomplished when symmetrical extractions are performed.…”

Section: Literature Review and Discussionmentioning

confidence: 99%

Asymmetric extractions in orthodontics

Melgaço

Araújo

2012

Dental Press J. Orthod.

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INTRODUCTION: Extraction decisions are extremely important in during treatment planning. In addition to the extraction decision orthodontists have to choose what tooth should be extracted for the best solution of the problem and the esthetic/functional benefit of the patient. OBJECTIVE: This article aims at reviewing the literature relating the advantages, disadvantages and clinical implications of asymmetric extractions to orthodontics. METHODS: Keywords were selected in English and Portuguese and the EndNote 9 program was used for data base search in PubMed, Web of Science (WSc) and LILACS. The selected articles were case reports, original articles and prospective or retrospective case-control studies concerning asymmetrical extractions of permanent teeth for the treatment of malocclusions. CONCLUSION: According to the literature reviewed asymmetric extractions can make some specific treatment mechanics easier. Cases finished with first permanent molars in Class II or III relationship in one or both sides seem not to cause esthetic or functional problems. However, diagnosis knowledge and mechanics control are essential for treatment success

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“…Classe II (GRABER, T. M., 1969;LOUGHLIN, 1952;MAILANKODY, 2004;OWMAN;BJERKLIN;KUROL, 1989;SERVOSS;MUSICH, 1994), o que pode ter gerado uma certa resistência entre alguns ortodontistas em aplicar este protocolo, passando ele a ser mais amplamente empregado há menos tempo com a desmistificação desta idéia pelas investigações científicas (JANSON, G. et al, 2007a;MIHALIK;PHILLIPS, 2003).…”

Section: A Amostraunclassified

“…Todavia, o tratamento da Classe II, subdivisão com três ou quatro extrações instituem efeitos predominantemente dentoalveolares (BISHARA et al, 1994b;JANSON, G. et al, 2007a;JANSON, G. et al, 2004b) VAN 'THOF, 1998;BIRKELAND et al, 1997;BUCHANAN et al, 1993;DEGUZMAN, 1995;DYKEN;HURST, 2001;GRAINGER, 1967;GRAY;DEMIRJIAN, 1977;JANSON, G. et al, 2004a;JANSON, G. et al, 2003a;LEWIS, E.A. et al, 1982;RICHMOND et al, 1995;RICHMOND et al, 1992b;SHAW et al, 1991).…”

Section: A Metodologiaunclassified

Eficiência do tratamento da má-oclusão de Classe II, subdivisão com extrações de três pré-molares e quatro pré-molares

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EEf fi ic ci iê ên nc ci ia a d do o t tr ra at ta am me en nt to o d da a m má á--o oc cl lu us sã ão o d de e C Cl la as ss se e I II I, , s su ub bd di iv vi is sã ão o c co om m e ex xt tr ra aç çõ õe es s d de e t tr rê ês s p pr ré é--m mo ol la ar re es s e e q qu ua at tr ro o p pr ré é--m mo ol la ar re es s Vocês fizeram com que a minha infância fosse muito mais feliz.Obrigada por me apoiarem e estarem sempre ao meu lado.À "minha vida":Dani, você é o amor da minha vida, carinhoso, companheiro e tudo o que preciso para me complementar. Obrigada pelo imenso incentivo e paciência, confortando-me nas horas tristes, vibrando com as minhas vitórias. Sem seu amor, nada valeria à pena. Eu amo você para sempre! Aos meus tios e primos:Por participarem constantemente da minha vida. Sem vocês, ela seria sem graça e sem emoção. Obrigada pelo eterno alto-astral e por acreditarem e confiarem em mim.Aos meus sogros Paulo e Arlete:Pelo apoio que me deram durante toda esta etapa de minha vida, sempre me dizendo que a perseverança é que nos faz atingir nossos objetivos.Ao "Tio Sérgio":Pela imensa ajuda sempre que eu tinha problemas com meu notebook.Sem você e seus conhecimentos de informática tudo seria mais difícil.À "Tia Thê":Por não ter hesitado um segundo sequer quando lhe pedi para fazer a correção da língua portuguesa de minha dissertação. Muito obrigada pelo carinho. À Márcia Masi:Pelo apoio incondicional que você tem me dado durante todos esses anos. Você é uma pessoa iluminada, na qual me espelho muito. Muito obrigada por ter me acolhido como uma filha.À Daniela Prado e Carla Scanavini:Pela dedicação com a qual sempre me auxiliam quando recorro a vocês.Com vocês aprendi e continuarei a aprender muito, não só sobre ortodontia, mas também sobre a vida. TzÜtwx †É xáÑxv|tÄÅxÇàxAAAAo Prof. Dr. Guilherme Janson:Pela orientação criteriosa, rigor científico, apoio e incentivos constantes. Além da oportunidade em compartilhar conhecimentos transmitidos ao longo desta jornada, contribuindo para o aprofundamento da minha qualificação profissional. Nós formamos uma turma maravilhosa, cúmplice e unida. Estes dois anos foram de grande aprendizado profissional e pessoal, em que compartilhamos momentos tristes e outros alegres. Agradeço a Deus por ter me dado a honra de poder conviver com todos vocês, cada um com seu jeitinho peculiar. Tenho certeza que nossa amizade será eterna. Às turmas de doutoradoPrincipalmente à Thaís e à Janine, pela disponibilidade em me auxiliar sempre que pedi ajuda e pelo convívio de amizade. difference between the groups, the greater improvement of midline deviation correction in group 2 than in group 1 shows that the treatment protocol with three premolar extractions has advantages in relation to the treatment protocol with four premolar extractions. TzÜtwx †É AAA

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Cephalometric evaluation of symmetric and asymmetric extraction treatment for patients with Class II subdivision malocclusions

Cited by 26 publications

References 24 publications

Frequency evaluation of different extraction protocols in orthodontic treatment during 35 years

Frequency evaluation of different extraction protocols in orthodontic treatment during 35 years

Asymmetric extractions in orthodontics

Eficiência do tratamento da má-oclusão de Classe II, subdivisão com extrações de três pré-molares e quatro pré-molares

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