Abstract:
:It is well known that elastomers exhibit viscoelasticity and as such have their mechanical properties modified by temperature. Nickel titanium archwires are also affected by temperature and have been modified with specific temperature related properties for clinical use. What is less well known is the effect that other environmental factors, such as food, might have on the force delivery properties of both elastomeric materials and nickel titanium coil springs used for space closure. For instance gross colour change in elastomeric chain is a common clinical finding in patients who consume spiced foods. The aim of this work was to determine the effect three common environmental factors namely, water, Coke, and turmeric solution have on elastomeric chain and nickel titanium coil springs. In addition, it was decided to re-examine the effect of temperature at 10, 22, and 37 degrees C on both these space closing materials. Unlike many previous investigations, the test specimens were held at a constant stretch throughout the test period, including during their transfer to the Instron Universal Testing machine for force measurement. Six force measurements were made over the first hour, then at 24 hours and 7 days. A control group of dry specimens, maintained at 22 degrees C, had additional measurements made weekly for a 4-week period. The results indicated that elastomeric chain was affected by all the test environments while nickel titanium springs were only affected by temperature.
journal_name
Eur J Orthodjournal_title
European journal of orthodonticsauthors
Nattrass C,Ireland AJ,Sherriff Mdoi
10.1093/ejo/20.2.169subject
Has Abstractpub_date
1998-04-01 00:00:00pages
169-76issue
2eissn
0141-5387issn
1460-2210journal_volume
20pub_type
杂志文章abstract::This clinical study investigated the practical value of two methods for debonding brackets attached by the adhesive Concise to acid-etched enamel surfaces. Forty-two Ultratrimm Standard metal brackets and 42 Fascination ceramic brackets were collected from juvenile patients undergoing orthodontic treatment. All metal ...
journal_title:European journal of orthodontics
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journal_title:European journal of orthodontics
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journal_title:European journal of orthodontics
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abstract::The prevalence of signs and symptoms attributed to craniomandibular disorders (CMD) was established in an orthodontically treated sample. The effect of orthodontic therapy upon this prevalence was studied by monitoring three groups of patients whose treatment procedures were different. The first group was treated with...
journal_title:European journal of orthodontics
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doi:10.1093/ejo/14.1.16
更新日期:1992-02-01 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
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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
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journal_title:European journal of orthodontics
pub_type: 杂志文章
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更新日期:2008-02-01 00:00:00
abstract::In order to study the prevalence of mandibular dysfunction in orthodontically treated prognathic patients after retention, 60 randomly selected patients were examined clinically. The functional status of the patients was evaluated using the anamnestic, clinical dysfunction index, and the index for occlusal status intr...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/13.2.124
更新日期:1991-04-01 00:00:00
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journal_title:European journal of orthodontics
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更新日期:2010-02-01 00:00:00
abstract::It is well known that mastication has a significant influence on mandibular growth and development, but the mechanism behind this effect has not yet been clarified. Furthermore, no studies have examined the effects of changes in mastication on the three-dimensional (3D) morphometry of the mandible. The aim of the pres...
journal_title:European journal of orthodontics
pub_type: 杂志文章
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更新日期:2010-02-01 00:00:00
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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::This investigation was designed to repeat classic studies into the associations between head posture and growth as a single unified study using up-dated methods for gathering and analysing the data. The material comprised the cephalometric radiographs of 59 children (34 males and 25 females) recorded in natural head p...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/cjq131
更新日期:2012-08-01 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::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
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更新日期:2009-08-01 00:00:00
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更新日期:2013-10-01 00:00:00
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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/19.4.391
更新日期:1997-08-01 00:00:00
abstract::This study provides sex specific reference data for the incremental growth of the mandibular condyle. The results pertain to a mixed-longitudinal sample of 113 males and 108 females followed annually between 6 and 16 years of age (total of 1647 observations). Growth of condylion was evaluated using naturally stable ma...
journal_title:European journal of orthodontics
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doi:10.1093/ejo/21.2.167
更新日期:1999-04-01 00:00:00
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journal_title:European journal of orthodontics
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更新日期:1997-04-01 00:00:00
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journal_title:European journal of orthodontics
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更新日期:1995-12-01 00:00:00
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更新日期:2004-04-01 00:00:00
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journal_title:European journal of orthodontics
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更新日期:2011-04-01 00:00:00
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journal_title:European journal of orthodontics
pub_type: 杂志文章
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更新日期:1994-04-01 00:00:00
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更新日期:2005-04-01 00:00:00
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journal_title:European journal of orthodontics
pub_type: 杂志文章
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更新日期:1994-10-01 00:00:00
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journal_title:European journal of orthodontics
pub_type: 杂志文章
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更新日期:2010-08-01 00:00:00
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journal_title:European journal of orthodontics
pub_type: 杂志文章
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journal_title:European journal of orthodontics
pub_type: 杂志文章
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更新日期:2011-02-01 00:00:00
abstract::The search for an ideal enamel surface finishing method following bracket debonding has met with equivocal response. In this study, four other methods were assessed to determine their effectiveness against the slow speed tungsten carbide bur which is regarded as the established method of removing residual composite. O...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/17.2.121
更新日期:1995-04-01 00:00:00
abstract::The aim of this in vitro study was to investigate both shear bond strength (SBS) by shear testing of indirectly bonded brackets, and the accuracy of a new transfer method, the Aptus bonding device (ABD). For comparison, the SBS of directly bonded brackets in two experimental arrangements was also measured. The precisi...
journal_title:European journal of orthodontics
pub_type: 杂志文章
doi:10.1093/ejo/cjm094
更新日期:2008-02-01 00:00:00