Thin-plate spline analysis of the short- and long-term effects of rapid maxillary expansion.


:The aim of this study was to investigate the short- and long-term effects induced by rapid maxillary expansion (RME) on the shape of the maxillary and circummaxillary structures by means of thin-plate spline (TPS) analysis. The sample consisted of 42 patients who were compared with a control sample of 20 subjects. The treated subjects underwent Haas-type RME, followed by fixed appliance therapy. Postero-anterior (PA) cephalograms were analysed for each treated subject at T1 (pre-treatment), T2 (immediate post-expansion), and T3 (long-term observation), and were available at T1 and T3 for the control group (CG). The mean age at T1 was 11 years and 10 months for both groups. The mean chronological ages at T3 were 20 years, 6 months for the treated group (TG) and 17 years, 8 months for the control group. The study focused on shape changes in the maxillary, nasal, zygomatic, and orbital regions. TPS analysis revealed significant shape changes in the TG. They consisted of an upward and lateral displacement of the two halves of the naso-maxillary complex as a result of active expansion in the short-term, and normalization of maxillary shape in the transverse dimension in the long-term (the initial transverse deficiency of the maxilla in the treated group was eliminated by RME therapy both in the short- and long-term). At the end of the observation period, the nasal cavities were larger when compared with both their pre-expansion configuration and the final configuration in the controls. RME with the Haas appliance appears to be an efficient therapeutic means to induce permanent favourable changes in the shape of the naso-maxillary complex.


Eur J Orthod


Franchi L,Baccetti T,Cameron CG,Kutcipal EA,McNamara JA Jr





Has Abstract


2002-04-01 00:00:00












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    journal_title:European journal of orthodontics

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    authors: Küseler A,Heliövaara A,Mølsted K,Marcusson A,Karsten A,Bellardie H,Sæle P,Brinck E,Skaare P,Rizell S,Chalien MN,Mooney J,Botticelli S,Eyres P,Shaw W,Semb G

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    journal_title:European journal of orthodontics

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    authors: Maki K,Nishida I,Kimura M

    更新日期:2005-02-01 00:00:00

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    journal_title:European journal of orthodontics

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    authors: Shon WJ,Kim TW,Chung SH,Jung MH

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    pub_type: 临床试验,杂志文章,随机对照试验


    authors: Akkaya S,Uner O,Alaçam A,Değim T

    更新日期:1996-02-01 00:00:00

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    authors: Cakmak F,Turk T,Sumer M

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    authors: Pilley JR,Mohlin B,Shaw WC,Kingdon A

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    journal_title:European journal of orthodontics

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    journal_title:European journal of orthodontics

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    authors: Llewellyn SK,Hamdan AM,Rock WP

    更新日期:2007-04-01 00:00:00

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    authors: Guo X,Watari I,Ikeda Y,Yang W,Ono T

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    authors: Marchisella C,Rolando F,Muscarella LA,Zelante L,Bracco P,Piemontese MR

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    authors: Dahlquist A,Gebauer U,Ingervall B

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    journal_title:European journal of orthodontics

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    journal_title:European journal of orthodontics

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    authors: Gavakos K,Witt E

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    journal_title:European journal of orthodontics

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    authors: Battagel JM,L'Estrange PR

    更新日期:1996-12-01 00:00:00

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    authors: Canut JA,Arias S

    更新日期:1999-08-01 00:00:00

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    pub_type: 杂志文章


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    更新日期:2008-08-01 00:00:00

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    pub_type: 杂志文章


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    更新日期:2006-02-01 00:00:00

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    authors: Rudge P,Sherriff M,Bister D

    更新日期:2015-02-01 00:00:00