Abstract：
:The effects of a transpalatal arch for the symmetrical derotation of rotated first molars were evaluated in 50 children, 8-13 years of age. The positions of the molars were compared with those in 34 individuals, aged 12-18 years, with normal occlusion. Prefabricated (GAC) stainless steel arches were used for 60-198 days (median time 122 days). The effect was recorded with a measuring microscope on dental casts from before and after the treatment. Molar positions were determined from the tips of the four cusps of the tooth in relation to a coordinate system based on palatal reference points. The centre of rotation of the molars during derotation were calculated from the movement of their cusps. Before derotation the first molars were significantly mesiopalatally rotated compared with the normal occlusion group. The derotation overcompensated the initial rotation. In about two-thirds of the cases the mesiobuccal cusp of the molar moved distally during the derotation. In the remaining cases it moved mesially or remained unchanged. The median distal movement was 0.3 mm on the right and 0.5 mm on the left side. Because many molars moved mesially, on average there was no gain in space in the dental arch from the derotation. The location of the centre of derotation varied widely but it was on average located midway between the distobuccal and distopalatal cusps. In most cases the derotation resulted in a small, unintended, expansion. The study showed that mesiopalatally rotated first molars can effectively be derotated with a transpalatal arch. The effect on the mesiodistal position of the mesiobuccal cusp, and particularly with regard to space gain, is, however, unpredictable.
journal_name
Eur J Orthodjournal_title
European journal of orthodonticsauthors
Dahlquist A,Gebauer U,Ingervall Bdoi
10.1093/ejo/18.3.257subject
Has Abstractpub_date
1996-06-01 00:00:00pages
257-67issue
3eissn
0141-5387issn
1460-2210journal_volume
18pub_type
杂志文章abstract：:The aetiology of palatal canine impaction is unclear. The aim of this research was to investigate the occlusal features that could contribute to the aetiology of palatal maxillary canine impaction. The material consisted of the pre-treatment dental casts of 34 patients (27 female and seven male) with unilateral palata...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cji022
更新日期：2005-10-01 00:00:00
abstract：:Edgewise orthodontic treatment utilizes a force couple in order to achieve labial-lingual tooth angulation. Two self-ligating brackets (Damon Q and Speed) were examined across a range of clinically relevant torques in order to assess the loading and unloading curves and bracket deformation. A previously developed torq...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjr076
更新日期：2013-12-01 00:00:00
abstract：Objective:To evaluate the transverse relationships of the first permanent molars after the correction of posterior crossbite performed during the deciduous dentition with two different treatment protocols. Materials/methods:Ninety patients (40 males and 50 females) with posterior crossbite were treated during the deci...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjw080
更新日期：2017-10-01 00:00:00
abstract：:The effects of an extra chromosome on tooth size were investigated and compared to male and female controls, respectively. Mesiodistal dimensions in men with Klinefelter's syndrome were generally found to be decreased when compared to the male controls. A more pronounced inhibitory effect of an extra X chromosome was ...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/15.3.195
更新日期：1993-06-01 00:00:00
abstract：:Malocclusion assessment methods are based on measurements of study casts, which requires that impressions be taken. In addition to being costly and time consuming, this process can be unpleasant for children. Therefore, the aim of this study was to evaluate intra- and inter-examiner reliability of intraoral score meas...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjl064
更新日期：2007-02-01 00:00:00
abstract：:The aim of this retrospective study was to examine the dental changes which occurred during buccal segment retraction in 39 subjects considered suitable for treatment with headgear to the maxillary dentition. Initially, a removable en masse appliance was fitted to distalize the buccal segments. Once the molar relation...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/20.1.5
更新日期：1998-02-01 00:00:00
abstract：:The aim of this study was to statistically assess the morphological changes of the rat periodontal ligament (PDL) and its vascularity in relation to varied magnitudes of superelastic force in experimental tooth movement using nickel-titanium (NiTi) alloy wire. Forces of 0.8, 1.6, 4, 8, and 18 g were applied to the upp...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjn075
更新日期：2009-02-01 00:00:00
abstract：:Two-hundred-and-thirty-eight subjects in three different age-groups (7, 11, and 15 years) were followed over a period of 4-5 years in respect of morphological malocclusions, and signs and symptoms of functional disturbances. About half of the 7-year-olds had at least one of the morphological malocclusions registered w...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/12.4.399
更新日期：1990-11-01 00:00:00
abstract：:The purpose of this study was to qualitatively and quantitatively assess the nickel, chromium, and ferrous levels in a population of 17 orthodontic patients undergoing treatment, compared with seven untreated individuals, employing a novel methodological approach and a new analytical technique. Salivary samples obtain...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/25.1.103
更新日期：2003-02-01 00:00:00
abstract：:Soft tissue stretching has been proposed as one of the control factors in craniofacial morphogenesis. However, its mechanism remains unclear. The present study investigated electromyographic (EMG) activity and muscle fibre composition of cervical muscles following prolonged head extension in growing rats. Thirty-six m...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/25.1.21
更新日期：2003-02-01 00:00:00
abstract：:Cervical column morphology was examined in adult patients with obstructive sleep apnoea (OSA) and compared with the cervical morphology of an adult control group with neutral occlusion, normal craniofacial morphology, and no history of sleep apnoea. The sleep apnoea group consisted of 91 patients, 16 females aged 29-5...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjn028
更新日期：2008-10-01 00:00:00
abstract：OBJECTIVES:The objective of the study was to evaluate the impact of temporomandibular joint (TMJ) arthritis on the functional disability and quality of life in patients affected by juvenile idiopathic arthritis (JIA). MATERIALS AND METHODS:Sixty-two consecutive patients with JIA with or without TMJ arthritis and 35 he...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjy034
更新日期：2019-03-29 00:00:00
abstract：:The aim of this study was to review recent randomized clinical trials (RCTs) dealing with the effectiveness of various modalities of orthopaedic/orthodontic expansion of maxillary arches with crossbite and the associated 6 month post retention stability. The study selection criteria included RCTs involving subjects wi...
journal_title：European journal of orthodontics
pub_type： 杂志文章,评审
doi：10.1093/ejo/cjr140
更新日期：2013-02-01 00:00:00
abstract：:Although there are numerous publications on bilateral non-compliance molar distalization appliances, there is limited information on problems such as asymmetrical unilateral Class II malocclusions. The aim of the present investigation was to examine the distalization of molars unilaterally in patients with a unilatera...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cji118
更新日期：2006-08-01 00:00:00
abstract：AIMS:To establish whether adolescent orthodontic patients with hypodontia have a preference between the aesthetic outcomes of two treatment strategies for lateral incisor agenesis. MATERIALS/METHODS:Standardized photographs of pre-orthodontic patients with missing lateral incisors were manipulated to produce images th...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cju021
更新日期：2015-04-01 00:00:00
abstract：:It was the aim of this study to investigate radiologically the distraction site in the gonial angle area after three different protocols of unidirectional mandibular distraction in sheep. Bilateral mandibular distraction was performed in nine sheep, and one other sheep served as a sham-operated control. In the nine ex...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/25.2.127
更新日期：2003-04-01 00:00:00
abstract：:A new appliance with samarium cobalt magnets embedded in unilateral blocks of acrylic is described, as a way of stimulating an autogenous costochondral graft, in a case with hemifacial microsomia. Laser scan images are used to illustrate a reversion towards facial soft tissue symmetry, over a 3-year period of treatmen...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/17.4.263
更新日期：1995-08-01 00:00:00
abstract：:The aim of this investigation was to determine the pattern of repair of root resorption regarding the location and type of tissue in adolescents after application of a well-controlled force magnitude. In 16 adolescents (mean age 13.8 years), the maxillary first premolars were buccally moved with a weekly reactivated f...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/20.6.727
更新日期：1998-12-01 00:00:00
abstract：:Two young patients, one female and one male, with asymmetric occlusal deviation and extreme Angle Class II division 1 malocclusions were treated with the Herbst appliance after cessation of endochondral growth (union of the radius epiphysis). During treatment, computer tomographic (CT) scanning and orthopantomograms o...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/22.6.649
更新日期：2000-12-01 00:00:00
abstract：Background/objectives:Functional appliances are commonly used to correct Class II malocclusion. This study aimed to compare the facial soft tissue changes in Caucasians between pre-treatment and with the construction bite versus pre-treatment and completion of treatment with a modified Twin-block appliance (MTBA). Mat...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjx098
更新日期：2018-09-28 00:00:00
abstract：:The purpose of this ex vivo study was to compare the bond strengths and modes of failure of brackets bonded with three self-etching products [Adper Prompt L-Pop (3M Espe), Futurabond NR (Voco) and Transbond Plus (3M Unitek)] and a conventional 38 per cent phosphoric acid-etching system Etch-Rite (Pulpdent Corp.) at tw...
journal_title：European journal of orthodontics
pub_type： 杂志文章,随机对照试验
doi：10.1093/ejo/cjn103
更新日期：2009-06-01 00:00:00
abstract：:The purpose of the present investigation was to determine the long-term prognosis of autotransplanted premolars with respect to periodontal healing. The subjects consisted of 195 patients aged 7 to 35 years, with a total of 370 autotransplanted all operated and followed with a standard technique. The observation perio...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/12.1.25
更新日期：1990-02-01 00:00:00
abstract：Background:Orthodontically induced external root resorption (OIRR) is a pathologic consequence of orthodontic tooth movement. However, the limitations of two-dimensional radiography suggest that cone beam computed tomography (CBCT) with its three-dimensional capabilities might be more suitable to assess OIRR. Objectiv...
journal_title：European journal of orthodontics
pub_type： 杂志文章,meta分析
doi：10.1093/ejo/cjy027
更新日期：2019-01-23 00:00:00
abstract：:Differential scanning calorimetry (DSC) was used to determine the transition temperature ranges (TTR) of four types of super-elastic orthodontic nickel-titanium coil springs (Sentalloy). A knowledge of the TTR provides information on the temperature at which a NiTi wire or spring can assume superelastic properties and...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/21.5.497
更新日期：1999-10-01 00:00:00
abstract：:Some Class II malocclusions are due, at least in part, to a retruded lower dental arch relative to the mandibular body. The purpose of this study was to determine if a direct anterior force on the lower incisors could lead to bodily movement of these teeth. Twenty-seven patients (9 males, 18 females; mean age: 9.8 yea...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjn114
更新日期：2009-08-01 00:00:00
abstract：BACKGROUND:Low-frequency vibrations have been proposed as a means of accelerating tooth movement and reducing orthodontic treatment times. OBJECTIVE:To determine any differences in the accuracy of dental movement in patients treated with a low-frequency vibration aligner protocol and/or by reducing the aligner replace...
journal_title：European journal of orthodontics
pub_type： 杂志文章,随机对照试验
doi：10.1093/ejo/cjy076
更新日期：2019-08-08 00:00:00
abstract：:The aim of this study was to investigate the in vivo bonding of orthodontic brackets using two resin-modified glass poly(alkenoate) cements and to compare them with a conventional light-cured diacrylate bonding agent. Twenty consecutive patients attending for bond up appointments took part in this randomized cross-mou...
journal_title：European journal of orthodontics
pub_type： 临床试验,杂志文章,随机对照试验
doi：10.1093/ejo/23.4.403
更新日期：2001-08-01 00:00:00
abstract：:The aim of this presentation is to describe an innovative adhesive procedure for connecting palatal implants with transpalatal arches (TPAs). The steps required for completing the procedure, the costs involved and the requisite time were reviewed and compared with those of two alternative procedures reported in the li...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cji002
更新日期：2005-06-01 00:00:00
abstract：:The aim of this randomized controlled trial was to assess the effectiveness of a mandibular advancement appliance (MAA) in managing severe snoring. Twenty-eight adults with severe snoring and normal overnight oximetry were recruited from sleep disorder clinics. A maxillary placebo appliance and a MAA were worn by each...
journal_title：European journal of orthodontics
pub_type： 临床试验,杂志文章,随机对照试验
doi：10.1093/ejo/23.2.127
更新日期：2001-04-01 00:00:00
abstract：:The effects of the van Beek activator in the correction of Class II, division 1 malocclusions were studied in 39 children, aged 9-13 years (median 11 years), and compared with the effects of treatment with an activator according to Herren and with those of an activator-headgear combination. Profile cephalograms were m...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/20.4.389
更新日期：1998-08-01 00:00:00
