Abstract：
OBJECTIVES:Loosening and loss rates of monocortical mini-implants are relatively high, therefore the following null hypothesis was tested: 'The local bone stress in mono and bicortically-anchored mini-implants is identical'. MATERIAL AND METHODS:Anisotropic Finite Element Method (FEM) models of the mandibular bone, including teeth, periodontal ligaments, orthodontic braces, and mini-implants of varying length, were created. The morphology was based on the Computed Tomography data of an anatomical preparation. All mini-implants with varying insertion depths (monocortical short, monocortical long, bicortical) were typically loaded, and the induced effective stress was calculated in the cervical area of the cortical bone. The obtained values were subsequently analysed descriptively and exploratively using the SPSS 19.0 software. RESULTS:The null hypothesis was rejected, since the stress values of each anchorage type differed significantly (Kruskal-Wallis Test, P < 0.001). Therefore, the lowest effective stress values were induced in bicortical anchorage (mean = 0.65MPa, SD = 0.06MPa) and the highest were induced in monocortical (short) anchorage of the mini-implants (mean = 1.79MPa, SD = 0.29MPa). The Spearman rank correlation was 0.821 (P < 0.001). CONCLUSIONS:The deeper the mini-implant was anchored, the lower were the effective stress values in the cervical region of the cortical bone. Bicortical implant anchorage is biomechanically more favourable than monocortical anchorage; therefore, bicortical anchorage should be especially considered in challenging clinical situations requiring heavy anchorage.
journal_name
Eur J Orthodjournal_title
European journal of orthodonticsauthors
Holberg C,Winterhalder P,Rudzki-Janson I,Wichelhaus Adoi
10.1093/ejo/cjt023subject
Has Abstractpub_date
2014-10-01 00:00:00pages
550-6issue
5eissn
0141-5387issn
1460-2210pii
cjt023journal_volume
36pub_type
杂志文章abstract：:The aim of this study was to evaluate the effects of the headgear activator (HGA) and Herbst appliance during active treatment and retention and at follow-up in children with a skeletal Class II malocclusion. The two groups comprised 16 consecutive male patients (mean age 11.6 +/- 1.42 years) treated with a HGA and 16...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjl052
更新日期：2006-12-01 00:00:00
abstract：:Fifteen patients, eight males and seven females with a mean age of 13.32 years, were selected for unilateral molar distalization. Dentally, all presented with a unilateral Class II molar relationship. The subjects were all in the permanent dentition with second molars erupted and with a well aligned lower dental arch....
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/23.5.507
更新日期：2001-10-01 00:00:00
abstract：:Orthodontic bonding with glass ionomer cement is comparatively new. The purpose of this article is to review the current literature covering both in vitro and in vivo studies of various glass ionomer cements that have been used for orthodontic bonding. The review indicates that there is little support in the literatur...
journal_title：European journal of orthodontics
pub_type： 杂志文章,评审
doi：10.1093/ejo/18.4.385
更新日期：1996-08-01 00:00:00
abstract：Objectives:To assess the potential effects of casein phosphopeptides (CPPs) on orthodontically induced iatrogenic root resorption (OIIRR) and orthodontic teeth movement. Materials and methods:Forty Wistar rats (aged 11 weeks) were randomly divided into experimental group (EG; n = 20) that received a diet supplemented ...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjw085
更新日期：2017-10-01 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：:Deviations in the growth of the mandibular condyle can affect both the functional occlusion and the aesthetic appearance of the face. The reasons for these growth deviations are numerous and often entail complex sequences of malfunction at the cellular level. The aim of this review is to summarize recent progress in t...
journal_title：European journal of orthodontics
pub_type： 杂志文章,评审
doi：10.1093/ejo/cjn117
更新日期：2009-02-01 00:00:00
abstract：:The purpose of this study was to assess the influence of two light units, a quartz-tungsten-halogen (QTH) and a light-emitting diode (LED), on the hardness and degree of conversion of an orthodontic composite resin. Sixty specimen disks were prepared from Transbond XT composite resin (3M Unitek) and light cured for 10...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjp048
更新日期：2010-02-01 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：SUMMARY:The purpose of this study was to assess the short-term psychosocial impact of dental aesthetic improvement in adult subjects. Sixty-nine adult patients (61 females and 8 males, aged 21-59 years) requesting aesthetic dental improvement were prospectively and randomly recruited for the study in a private orthodon...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjp144
更新日期：2010-08-01 00:00:00
abstract：:The effect of protruded mandibular function on the maxilla and zygoma was studied in young unilaterally condylectomized growing rats. Forty-eight-4-week-old rats were divided into two experimental and two control groups as follows: group A, 12 animals unilaterally condylectomized on the right side; the mandible was al...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/19.2.205
更新日期：1997-04-01 00:00:00
abstract：:The aims of the study were to analyse the records of 26 subjects (18 females, eight males) with maxillary canine-first premolar transposition (Mx.C.P1) together with 160 subjects with a palatally displaced canine (PDC) to determine the pattern of tooth agenesis in these cases and to compare them with similar samples r...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cji040
更新日期：2005-10-01 00:00:00
abstract：:Different types of ipriflavone (IF) have been reported to be effective when used as a remedy for bone loss due to osteoporosis. However, no information is available regarding the relationship between IF and jaw bone structure. The aim of this study was to examine the effect of IF on rat mandibles during the growth sta...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjh099
更新日期：2005-02-01 00:00:00
abstract：:The present study reveals new data concerning the prenatal interrelationship between maturation of teeth and basicranial bones. By using radiographs of the mid-sagittal tissue segment of 43 human craniums, the developmental relationship between a well-defined stage of the central maxillary incisor development and the ...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/15.2.149
更新日期：1993-04-01 00:00:00
abstract：:This prospective study investigated the skeletal, dental, and soft-tissue effects of a mini maxillary protractor appliance in class III subjects with maxillary retrusion and mandibular protrusion and compared these changes with those of untreated, well matched control sample with normal occlusions. Twenty patients wit...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjt006
更新日期：2014-02-01 00:00:00
abstract：Background:Scientific evidence is insufficient to answer the question of whether premature birth causes altered tooth-crown dimensions. Objective:To evaluate permanent tooth-crown dimensions in prematurely born children and to compare the findings with full-term born controls. Subjects and Methods:Preterm children of...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjx021
更新日期：2017-11-30 00:00:00
abstract：BACKGROUND:Although ceramic brackets have been extensively used for decades in orthodontics there is not till today any study focusing on the possible deterioration of mechanical properties after in vivo ageing. OBJECTIVES:To determine whether the mechanical properties of alumina orthodontic brackets change after intr...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjz024
更新日期：2020-01-27 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：:Clinical outcomes in children born with a cleft lip and palate (CLP) have been an area of interest for orthodontists for a number of years. Whilst tools for measurement of these outcomes are available, there is no widely accepted measure of initial cleft severity and no known quantitative indices. Therefore, the poten...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/22.1.93
更新日期：2000-02-01 00:00:00
abstract：:The aim of this study was to explore the complexities in constructing league tables purporting to measure orthodontic clinical outcomes. Eighteen orthodontists were invited to participate in a cost-effectiveness study. Each orthodontist was asked to provide information on 100 consecutively treated patients. The Index ...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjn036
更新日期：2008-12-01 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：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：Objective:To investigate effects of mandible advanced device (MAD) therapy for obstructive sleep apnoea-hypopnea syndrome (OSAHS) on the neuron apoptosis and acetylcholine esterase activity in frontal cortex. Materials and methods:Thirty male New Zealand white rabbits were randomly divided into three groups (n = 10 in...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjx060
更新日期：2018-05-25 00:00:00
abstract：:The aim of this study was to investigate the relationship between Turkish university students' awareness of malocclusion, their satisfaction with their personal dental appearance, and the severity of their occlusal irregularities. The sample consisted of 841 randomly selected university students, 522 (62.1 per cent) m...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjn083
更新日期：2009-04-01 00:00:00
abstract：:The purpose of this study was to determine whether an additional application of Fluor Protector before band cementation with glass ionomer cement reduces white spot formation compared with band cementation with glass ionomer cement. In the in vitro study, 80 premolars were divided in half, creating a control and a tes...
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/20.3.219
更新日期：1998-06-01 00:00:00
abstract：:This retrospective, cephalometric study was undertaken in an attempt to identify the aetiological features which may be associated with a Class III malocclusion in the growing child. Four-hundred-and-ninety-five lateral cephalometric radiographs (210 control and 285 Class III films) formed the basis of the study. All ...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/15.5.347
更新日期：1993-10-01 00:00:00
abstract：:The purpose of this study was to examine the natural growth changes which occur between 22 and 33 years of age. The material consisted of two series of cephalograms of 74 females and 90 males with approximately 11 years between the two series. None of the subjects had orthodontic retainers when the first exposure was ...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/17.6.525
更新日期：1995-12-01 00:00:00
abstract：:The aim of this study was to compare standard plaster models with their digital counterparts for the applicability of the Index of Complexity, Outcome, and Need (ICON). Generated study models of 30 randomly selected patients: 30 pre- (T(0)) and 30 post- (T(1)) treatment. Two examiners, calibrated in the ICON, scored t...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjn077
更新日期：2009-06-01 00:00:00
abstract：:This study aimed to gather statistically validated information on the changes in orthodontic variables in patients with bilateral upper lateral incisor aplasia treated with isolated orthodontic space closure. Data were collected from 25 (15 females, 10 males) consecutively treated, unselected adolescents [mean age at ...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjn100
更新日期：2009-06-01 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：:In 138 successfully treated Class II division 1 patients (40 Activator and 98 Herbst) effective temporomandibular joint (TMJ) growth changes (a summation of condylar remodelling, glenoid fossa remodelling, and condylar position changes within the fossa), and their influence on the position of the chin and the rotation...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/24.6.627
更新日期：2002-12-01 00:00:00
