Abstract：
:Tooth displacement was analysed on human autopsy material for various types of orthodontic force systems using an electronic strain gauge technique. Tooth movements were registered in two dimensions with low force clip gauges on three sections of the mandible, containing the first premolar and the first molar. The sensitivity was 0.1 microns when horizontal forces of 50, 100, and 150 cN were applied at different horizontal levels producing different M/F ratios. The relationship between a force system and the resulting tooth movement was described by the position of the centre of rotation, CR, and the angle of rotation. The centre of resistance was determined for the three autopsy specimens, and depended on tooth geometry, root length, and level of bony margin. Important differences in location were found. The dynamics of initial tooth movement were analysed within the first minute of load application. Force/displacement curves were generated to evaluate the behaviour of the periodontal ligament. There was a linear correlation between the two variables. Freezing the autopsy material some days before testing had no detectable effect. The results from measurements on human autopsy material were compared with previously derived in vivo measurements.
journal_name
Eur J Orthodjournal_title
European journal of orthodonticsauthors
Pedersen E,Andersen K,Melsen Bdoi
10.1093/ejo/13.1.65subject
Has Abstractpub_date
1991-02-01 00:00:00pages
65-74issue
1eissn
0141-5387issn
1460-2210journal_volume
13pub_type
杂志文章abstract：:The age- and gender-related shape variations of the craniofacial skeleton in skeletal Class I children were quantified using a Fourier analysis on the pre-treatment lateral head films of 122 orthodontic patients (age range 7-15 years), who were subdivided into six groups for sex and age (2-year intervals). Seven landm...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/19.6.669
更新日期：1997-12-01 00:00:00
abstract：OBJECTIVE:To investigate the factors associated with the change in alveolar bone level of mandibular second and third molars after second molar protraction into the space of the missing first molar (L6) or second premolar (LE). METHODS:Fifty-one patients in whom space of the missing L6 or LE was treated with second mo...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjz001
更新日期：2019-09-21 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：:It was the aim of the present study to cast light on the role of the mandible in relation to head posture and airway space by evaluating patients before and after surgical correction of mandibular prognathism. The material comprised standardized profile cephalograms of 52 patients with mandibular prognathism. All pati...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/oxfordjournals.ejo.a035962
更新日期：1989-02-01 00:00:00
abstract：OBJECTIVES:The Fränkel manoeuvre is a procedure by which the mandible of Class II individuals is postured forward in dental Class I relationship. The evaluation of the resulting facial profile provides information concerning the components determining the sagittal discrepancy. Data concerning the reproducibility of its...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjv072
更新日期：2016-08-01 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：:P561T heterozygous missense mutation in the growth hormone receptor (GHR) is a candidate genetic polymorphism (single-nucleotide polymorphism) for human mandibular growth. The purpose of this study was to assess whether this mutation affects mandibular growth during early childhood. The difference in mandibular growth...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjp017
更新日期：2009-10-01 00:00:00
abstract：:The purpose of the study was to evaluate differences in dental arch morphology among an orthodontic sample of 386 untreated adult females between 17 and 68 years of age, categorized by age group (17-25 years, 26-35 years, or 35+ years) and malocclusion (Class I, Class II division 1, or Class II division 2). The result...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/16.1.47
更新日期：1994-02-01 00:00:00
abstract：:The purpose of the present study was to compare the cranio-facial morphology in children with and without enlarged tonsils. The material consisted of 73 children with enlarged tonsils, and a control group of children with normal tonsils, matched for age, sex, and number. The mean age for the groups was 10.1 and 10.0 y...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/12.3.233
更新日期：1990-08-01 00:00:00
abstract：:The purpose of this study was to propose a growth-based structural superimposition method for assessment of cervical vertebral fusion and evaluate variations and abnormalities of the upper cervical vertebrae. Standardized lateral cephalograms of 156 patients (69 males and 87 females, age range 6-20 years), representin...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjp049
更新日期：2010-02-01 00:00:00
abstract：:This prospective study analysed the lateral cephalometric radiographs of 59 dentate, white, Caucasian males. Thirty-five patients with proven obstructive sleep apnoea (OSA) formed the experimental group, while 24 subjects with no history of respiratory disease acted as controls. Radiographs were traced and digitized, ...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/18.6.557
更新日期：1996-12-01 00:00:00
abstract：Objective and design:Our aim was to evaluate the effect of mandible advancement splint (MAS) in mild, moderate, and severe obstructive sleep apnea (OSA). We also determined, if and in which OSA-groups the adequate forward movement in MAS could be quantified without sleep registration for different OSA levels. A retrosp...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjw068
更新日期：2017-10-01 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：Introduction:Orthodontic miniscrews are an increasingly popular choice to achieve absolute anchorage. The temporary use of miniscrews and their recent introduction have limited the debate over the biological aspect of the materials to that of the surface that permeates the field of dental implants. The aim of the prese...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjw069
更新日期：2017-10-01 00:00:00
abstract：:The purpose of this study was to clarify the contributing factors and their influences on temporomandibular joint internal derangement (TMJ ID) symptoms in subjects with mandibular asymmetry. Postero-anterior (PA) cephalograms of 187 pre-orthodontic treatment subjects (aged 18-45 years, mean 23.9 years) were used to i...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cji073
更新日期：2006-02-01 00:00:00
abstract：:The aim of this research was to evaluate the effect of the Delaire surgical technique on the midfacial morphology in a group of subjects with a congenital unilateral cleft of lip and palate (UCLP), prior to orthodontic treatment. Thirty-five UCLP (15 left and 20 right) patients (16 males and 19 females, mean age 7.03+...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjn068
更新日期：2009-02-01 00:00:00
abstract：:The persistence of childlike deglutition after the replacement of deciduous teeth is described as atypical deglutition. This condition has been attributed to sucking action without nutritive purposes, use of a feeding bottle, oral respiration, and anatomical abnormalities. Among the possible anatomical alterations, th...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjq167
更新日期：2012-02-01 00:00:00
abstract：:This retrospective study examined the occurrence of congenitally missing permanent teeth and the need for dental treatment in the Regensburg University Medical Centre of Eastern Bavaria. Using a dental administration software tool, a total of 1442 patients who presented for orthodontic treatment between 1994 and 2006 ...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjq021
更新日期：2011-02-01 00:00:00
abstract：:The aim of this investigation was to examine the fluoride uptake by enamel after application of glass ionomer cement for orthodontic band cementation compared with zinc phosphate cement. The study was conducted on 21 children whose mean age was 14 years. All the children were reared in the Middle Anatolian cities wher...
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/18.1.81
更新日期：1996-02-01 00:00:00
abstract：Aim:To assess the association between tooth wear (TW) and gingival recession (GR). Materials and Methods:Two hundred and ten orthodontically treated participants (100 males) were evaluated. GR and TW were rated independently by four raters on plaster models at four time points: before treatment (T1), mean age 13.8 yea...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjx083
更新日期：2018-07-27 00:00:00
abstract：:Tensile bond strength and bond failure location were evaluated in vitro for two types of aesthetic brackets (non-silanated ceramic, polycarbonate) and one stainless steel bracket, using bovine teeth as the substrate and diacrylate resin as the adhesive. The results show that metallic bracket had the highest bond stren...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/21.1.71
更新日期：1999-02-01 00:00:00
abstract：:The objective of the present study was to evaluate the cytotoxicity and degree of monomer conversion of resin-reinforced glass ionomer cements (RGIC) over different time periods. Four RGICs: Fuji Ortho LC (FOLC), Fuji Ortho Band (FOB), Orthoglass (OGL), and Multicure Glass Ionomer (MCI) were evaluated for cytotoxicity...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjr009
更新日期：2012-06-01 00:00:00
abstract：:The aim of this study was to assess the severity of any underlying malocclusion in subjects presenting for treatment of a palatally impacted canine (PIC) using a modification of the Dental Health Component (DHC) of the Index of Treatment Need (MIOTN), which does not factor in the impacted canine. The pre-treatment stu...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjn130
更新日期：2009-08-01 00:00:00
abstract：Background:Detection of pubertal growth peak is vital in orthodontic treatment timing and planning. Gingival crevicular fluid (GCF) contains abundant proteins from different sources and is an ideal source of biomarkers. The aim of this research is to detect candidate GCF biomarkers of pubertal growth by tandem mass tag...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjx082
更新日期：2018-07-27 00:00:00
abstract：:The present review summarizes two decades of published and unpublished studies on normal and pathological development of sella turcica and pituitary gland in humans. The pathological conditions are studied in known genotype deviations, syndromes, and other malformations. The studies include histological analyses of hu...
journal_title：European journal of orthodontics
pub_type： 杂志文章,评审
doi：10.1093/ejo/cjs091
更新日期：2015-02-01 00:00:00
abstract：Background/objectives:Maxillary tooth distal movement is a treatment option for Class II malocclusion. This prospective clinical study (split-mouth design) was aimed to compare chondroitin sulphate (CS) levels in gingival crevicular fluid (GCF), the rates of tooth movement, and patient pain and discomfort during segmen...
journal_title：European journal of orthodontics
pub_type： 杂志文章,随机对照试验
doi：10.1093/ejo/cjx092
更新日期：2018-09-28 00:00:00
abstract：:As orthodontic appliances can corrode with time in the oral environment, the aim of this study was to compare the release of metal ions from new and recycled brackets immersed in buffers of different pH values over a 48 week period. To simulate commercial recycling, the stainless steel brackets were divided into two g...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/26.2.171
更新日期：2004-04-01 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：:The purpose of this investigation was to assess the vertical changes occurring in skeletal open bite patients treated orthodontically with different extraction patterns. The study was conducted using lateral cephalometric radiographs taken before and after treatment. Fifteen patients who had an anterior open bite (AOB...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/24.4.407
更新日期：2002-08-01 00:00:00
abstract：OBJECTIVE:To analyse cost-effectiveness of anchorage reinforcement with buccal miniscrews and with molar blocks. We hypothesized that anchorage with miniscrews is more cost-effective than anchorage with molar blocks. TRIAL DESIGN:A single-centre, two-arm parallel-group randomized controlled trial. METHODS:Adolescents...
journal_title：European journal of orthodontics
pub_type： 杂志文章,随机对照试验
doi：10.1093/ejo/cjy041
更新日期：2019-03-29 00:00:00
