Abstract:
:Recent studies revealed that the initial root resorption occurred in the peripheries of the necrotic periodontal ligament (PDL) and was performed by mono-nucleated non-clast macrophage- and fibroblast-like cells (Brudvik and Rygh, 1993a, b). The aim of the present transmission electron microscopic (TEM) investigation was to study in more detail the cells involved in removal of the main hyalinized tissue and those involved in root resorption, occurring on the root surface situated beneath the main hyalinized tissue. Twelve male Wistar rats were used. The maxillary first molar was moved mesially by a fixed orthodontic appliance for 7 and 10 days. The results indicate that multi-nucleated giant cells (MNGC) without a ruffled border surface, as well as mono-nucleated macrophage-like cells were responsible for removal of the necrotic tissue and also for resorption of the surface parts of the root cementum. Although the present MNGC showed many morphological traits similar to the observed odontoclasts and osteoclasts, except for their lack of ruffled borders, it is assumed that they are derived from the mono-nucleated phagocytic system. Multi-nucleated clast-like cells with ruffled border were never observed near the remnants of the necrotic tissue. Such cells were found only in the resorption lacunae on root and bone surfaces.
journal_name
Eur J Orthodjournal_title
European journal of orthodonticsauthors
Brudvik P,Rygh Pdoi
10.1093/ejo/16.4.265subject
Has Abstractpub_date
1994-08-01 00:00:00pages
265-73issue
4eissn
0141-5387issn
1460-2210journal_volume
16pub_type
杂志文章abstract::To investigate whether orthodontic cases can fulfil gnathologic requirement, models of 10 adolescent patients (of the Department of Orthodontics at the University Dental Clinic, Graz) were mounted in an articulator at band removal and 2, 4 and 12 weeks and one year later. During this year the patients wore a gnatholog...
journal_title:European journal of orthodontics
pub_type: 杂志文章,评审
doi:10.1093/oxfordjournals.ejo.a035989
更新日期:1989-08-01 00:00:00
abstract::Mandibular advancement splints (MASs) are used to advance the mandible forward in patients with sleep-disordered breathing. The conventional rigid MAS restricts the movement of the mandible, and this immobility sometimes produces discomfort, including temporomandibular disorders. A simple method for fabricating a mobi...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/cjp040
更新日期:2009-12-01 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 investigation was to study symptoms of temporomandibular disorders (TMD) and headaches longitudinally in girls with Class II malocclusions receiving orthodontic treatment in comparison with subjects with untreated Class II malocclusions and girls with normal occlusion, and to evaluate the need and dema...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/22.3.283
更新日期:2000-06-01 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
abstract::Katz's quantitative modification of Angle's occlusion classification has been found to have a high intra- and inter-examiner agreement among orthodontists. In the present study an attempt was made to introduce a 'combined' system comprising Katz's modification and overjet/overbite millimetric measurements in order to ...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/22.2.169
更新日期:2000-04-01 00:00:00
abstract:OBJECTIVE:The aim of this trial was to test whether the use of a smartphone application (app) connected to a toothbrush improves the oral hygiene compliance of adolescent orthodontic patients. DESIGN:The study was designed as a multicentre, randomized, controlled clinical trial. SETTING:Two academic hospitals. ETHIC...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/cjz105
更新日期:2020-02-01 00:00:00
abstract::In order to apply high, short-term forces during rapid maxillary expansion (RME) to the sutures of the maxilla with minimum loss of force and without causing unwanted side-effects (dentoalveolar tipping, etc.), the appliance should be as rigid as possible. The retention arms of the RME screws, representing a particula...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/cjq065
更新日期:2011-06-01 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::The purpose of this study was to assess quantitatively the roughness of the enamel surface following debonding using two resin removal methods. The enamel surface of 30 premolar crowns was covered with black tape with a 3 mm window on the middle buccal third to standardize the area of analysis. The initial enamel surf...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/26.3.333
更新日期:2004-06-01 00:00:00
abstract::The surface topography of 100 clinically used archwires of stainless steel, beta-, or nickel-titanium were investigated that had contacted either ceramic or stainless steel brackets. One group consisted of two sets: 60 wires with no treatment records accessed to bias analyses, and 40 wires for which extensive clinical...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/22.4.409
更新日期:2000-08-01 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::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::SummaryFine orthodontic treatment results are fine. Fine stable results are finer. But when is stability achieved? Many studies show that the decline from optimal alignment and occlusion is most rapid immediately after appliance removal and slows down after some three to five years. For stabilization, we need some for...
journal_title:European journal of orthodontics
pub_type: 评论,杂志文章
doi:10.1093/ejo/cju069
更新日期:2015-08-01 00:00:00
abstract::The aims of this study were to provide a description of the craniofacial morphology of Singaporean Chinese children and to compare gender differences. Lateral cephalometric radiographs were obtained of 81 Singaporean Chinese children (31 boys and 50 girls; mean age 12.7 and 12.5 years, respectively, standard deviation...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/26.6.605
更新日期:2004-12-01 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 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::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::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:OBJECTIVES:Mechanobiology phenomena constitute a major element of the cellular and tissue response during orthodontic treatment and the implantation of a biomaterial. Better understanding these phenomena will improve the effectiveness of our treatments. The objective of this work is to validate a model of three-dimensi...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/cjaa017
更新日期:2020-09-11 00:00:00
abstract:BACKGROUND AND OBJECTIVES:Clear aligner is an advanced orthodontic method with benefits of comfort, aesthetics, and convenience. This study aimed to compare pain perception, anxiety, and impacts on oral health-related quality of life (OHRQoL) between adult patients receiving clear aligners and fixed appliances during t...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/cjaa037
更新日期:2020-07-02 00:00:00
abstract::The long-term goal of this research is to define the dimensions of nasal airway adequacy in children. Nasal airway size and variables associated with growth were assessed in 138 healthy children aged 7-15 years. The pressure-flow technique (Warren, 1984) was used to calculate the smallest cross-sectional area of the n...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/13.4.311
更新日期:1991-08-01 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::Fifty-two patients with malocclusions underwent orthodontic treatment in combination with orthognathic surgery involving a Le Fort I and/or sagittal split osteotomy. Approximately 5 years after surgery, the patients were examined for signs and symptoms of temporomandibular disorders (TMD). The frequencies were found t...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/22.5.537
更新日期:2000-10-01 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 aim of this study was to investigate if debonding microspheres (DM) could enhance electrothermal orthodontic debonding, and specifically to evaluate if the addition of DM, in varying concentrations to the orthodontic adhesive process, will affect bond strength. Bovine teeth (n=8) were mounted in acrylic using a si...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/cjq091
更新日期:2011-08-01 00:00:00
abstract::This paper describes and illustrates an innovative versatile skull-holding device for experimental research in cephalometrics. Repositioning of the skulls was evaluated and found to be highly reproducible. ...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/18.2.193
更新日期:1996-04-01 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:Aim:The aim of this study was to describe the longitudinal changes in facial morphology, dental arch alterations and oral functional capacities that occur in growing patients with Duchenne muscular dystrophy (DMD) in order to identify the effects of the progression of the disease. Subjects and Methods:Twelve DMD patie...
journal_title:European journal of orthodontics
pub_type: 杂志文章,多中心研究
doi:10.1093/ejo/cjx038
更新日期:2018-04-06 00:00:00
abstract:OBJECTIVES:To investigate mandibular morphology in adults affected by posterior unilateral crossbite (PUXB) and to evaluate the hemi mandibular volumes from the crossbite (CB) and non-CB sides of the same patients. METHODS:Thirty-eight cone beam computed tomography (CBCT) images were consecutively recruited and the Di...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/cjz106
更新日期:2020-01-29 00:00:00