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 upper first molars of five groups of 10-week-old male Wistar rats (300-320 g) for 1, 7, 14, 21, and 28 days. A control group with no orthodontic appliance application was assessed in accordance with the five experimental periods. The specimens were observed under light microscopy, processed by computer imaging, and analysed statistically with Tukey's HSD non-parametric test. One day after the start of the experiment, a few blood vessels could be seen in the compressed PDL with forces of 0.8 and 1.6 g. The cross-sectional areas of blood vessels (CAV) and periodontal ligament (CAPL) in the experimental groups where a force of over 4 g was applied were significantly smaller than those where 0.8 and 1.6 g forces were used, and in the control group. On day 7, large CAV were seen in the 1.6, 4, and 8 g groups. On day 28, the 8 and 18 g groups showed significantly larger CAPL than the 0.8, 4 g, or control groups. The findings suggest that a light continuous force, under 1.6 g, maintains the vascular structure during experimental tooth movement. In contrast, a heavy continuous force over 4 g causes the vascular structure to be absent in the early stages of tooth movement, but a dynamic regeneration of the PDL with vascularity and expansion follows.
journal_name
Eur J Orthodjournal_title
European journal of orthodonticsauthors
Noda K,Nakamura Y,Kogure K,Nomura Ydoi
10.1093/ejo/cjn075subject
Has Abstractpub_date
2009-02-01 00:00:00pages
37-45issue
1eissn
0141-5387issn
1460-2210pii
cjn075journal_volume
31pub_type
杂志文章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
abstract：: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...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/24.2.143
更新日期：2002-04-01 00:00:00
abstract：:A number of investigations have looked at psychological changes occurring in association with orthognathic treatment. However, most of these studies have used a pre-surgery questionnaire as the baseline measurement. There is little data relating to the true baseline, i.e. that prior to any active treatment. Until this...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/23.6.751
更新日期：2001-12-01 00:00:00
abstract：:The objective of the present investigation was to determine the intrapulpal temperature changes and to compare the shear bond strength (SBS) of bondable buccal tubes bonded by high-intensity light sources. Ninety caries-free human first molar teeth extracted for periodontal reasons were used. For the temperature measu...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjn013
更新日期：2008-08-01 00:00:00
abstract：:Mechanical stress induces human periodontal ligament (PDL) cells to express an osteoblastic phenotype in vitro. Core binding factor a1 (CBFA1) is a key regulator of osteoblast differentiation. This study was designed to investigate the role of CBFA1 in alveolar bone remodelling, specifically the expression of CBFA1 me...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjq010
更新日期：2010-12-01 00:00:00
abstract：OBJECTIVE:To compare orthodontically induced inflammatory root resorption (OIIRR) and patient perception of pain during orthodontic treatment between 0.018-inch and 0.022-inch slot bracket systems. SUBJECTS AND METHODS:Eligible participants aged 12 years or above were allocated to treatment with the 0.018-inch or 0.02...
journal_title：European journal of orthodontics
pub_type： 杂志文章,随机对照试验
doi：10.1093/ejo/cjy039
更新日期：2019-03-29 00:00:00
abstract：:This radiographic study analysed the changes that occurred in the airway and surrounding structures when subjects with sleep disordered breathing moved from the upright to the supine position. Radiographs of 100 dentate, Caucasian males were examined. Fifty individuals were non-apnoeic snorers and in 50 a diagnosis of...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/24.3.263
更新日期：2002-06-01 00:00:00
abstract：:The physiology of masseter muscles is known to change in response to functional demands, but the effect on the satellite cell (SC) population is not known. In this study, the hypothesis is tested that a decreased functional demand of the masseter muscle causes a reduction of SCs. To this end, twelve 5-week-old male Sp...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjs044
更新日期：2014-06-01 00:00:00
abstract：:The purpose of this work was to examine whether the clinical eruption of the permanent first molars and incisors is affected by pre-term birth. The data applied to 328 prematurely born white and black children and 1804 control children who participated in the Collaborative Perinatal Project (USA) in the early 1960s an...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/25.3.293
更新日期：2003-06-01 00:00:00
abstract：:Based on observations of longitudinal changes in dental arch dimensions, it has been stated that an individuality of arch form and an integrity of this form exists. However, longitudinal studies evaluating arch form changes have rarely been reported in the literature. The purpose of this investigation was to use a com...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/23.1.51
更新日期：2001-02-01 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：:The objective of this research was to investigate the effect of applying a sustained seating force during bonding on the adhesive layer and on shear bond strength (SBS) of orthodontic brackets. Forty human premolars divided into two groups were included in the study. Stainless steel brackets were bonded to the premola...
journal_title：European journal of orthodontics
pub_type： 杂志文章,随机对照试验
doi：10.1093/ejo/cjq096
更新日期：2011-08-01 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：: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 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：Background:Hawley retainers (HRs) and vacuum formed retainers (VFRs) are the most commonly used removable retainers in the orthodontic practice. Patients' cooperation in wearing these appliances is affected by the levels of discomfort and oral impairment. The evidence regarding their acceptably among orthodontic patien...
journal_title：European journal of orthodontics
pub_type： 杂志文章,随机对照试验
doi：10.1093/ejo/cjx024
更新日期：2017-08-01 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：:The aim of the present study was to develop an index specifically for the measurement of treatment complexity. Input factors were directly related to complexity, and the output was a score measuring the degree of treatment complexity. The sample comprised 120 sets of dental casts, 30 for each of the four main malocclu...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjl080
更新日期：2007-04-01 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 purpose of this investigation was to evaluate the effects of dental tipping and rotation immediately after surgically assisted rapid palatal expansion (SARPE). Fourteen patients (10 females, four males; mean age 25.6 years) who required a SARPE procedure were available for this study. A palatal expander appliance ...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/25.4.353
更新日期：2003-08-01 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 aim of this study was to identify the craniofacial characteristics of 16 osteogenesis imperfecta (OI) patients, 10 males and 6 females, aged 7-15 years. The control group comprised 863 Chinese children from 6 to 18 years of age. Eleven cephalometric reference points and 25 variables were measured on the lateral ce...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjl035
更新日期：2007-06-01 00:00:00
abstract：:Various studies have reported a significant reduction in tensile bond strength of brackets when bonding is carried out immediately after bleaching. The purpose of this investigation was to determine the effect of an antioxidant agent on the tensile bond strength values of metal brackets bonded with composite resin to ...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cji044
更新日期：2005-10-01 00:00:00
abstract：Objectives:To assess arch width, palatal surface area, and volume in surgically treated unilateral cleft lip and palate (UCLP) in mixed dentition children in comparison with non-cleft lip and palate (NCLP) children using a 3D laser scanning. Materials and Methods:38 subjects (Caucasian origin), 5.63-11.9 years of age ...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjx019
更新日期：2017-11-30 00:00:00
abstract：SUMMARY:The aim of this study was to measure lingual volume and to correlate it with and predict it from the area of the radiographic shadow of the tongue as well as with demographic and biometric characteristics. In 70 healthy subjects (35 males and 35 females) aged between 20 and 37 years, tongue volume was determine...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjp105
更新日期：2010-08-01 00:00:00
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 ...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/16.4.265
更新日期：1994-08-01 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：:The performance of 5941 stainless steel orthodontic brackets bonded with a no-mix adhesive (Right-on) in 563 patients was reviewed over a 5-year period. The effects of age and sex of the patient, treatment mechanics, operator experience, and arch location on the failure rate and mean survival time (MST) of bonded orth...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/16.3.203
更新日期：1994-06-01 00:00:00
abstract：BACKGROUND:Hyaluronic acid (HA) is a major molecular component of the articular cartilage of the temporomandibular joint (TMJ) influencing joint lubrication. Functional lateral shift of the mandible (FLSM) can lead to malocclusion. This study investigated the effects of FLSM on HA metabolism and lubrication of the TMJ ...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/cjaa012
更新日期：2020-02-29 00:00:00
abstract：:Seven-hundred-and-ninety-one 15-year-olds were subjected to an anamnestic and clinical examination of craniomandibular disorders. These individuals had been examined at the age of 12 years and this is one section of an extensive longitudinal investigation into the effects of malocclusion, and the effectiveness of orth...
journal_title：European journal of orthodontics
pub_type： 杂志文章
doi：10.1093/ejo/14.2.152
更新日期：1992-04-01 00:00:00
