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European journal of orthodontics 15건

  1. [해외논문]   Development and testing of novel bisphenol A-free adhesives for lingual fixed retainer bonding   SCI SCIE

    Iliadi, Anna (* Department of Orthodontics, School of Dentistry, University of Athens, Greece, ) , Eliades, Theodore (** Clinic of Orthodontics and Paediatric Dentistry, Center of Dental Medicine, University of Zurich, Switzerland, ) , Silikas, Nick (*** Biomaterials Science Research Group, School of Dentistry, University of Manchester, UK, and ) , Eliades, George (**** Department of Biomaterials, School of Dentistry, University of Athens, Greece)
    European journal of orthodontics v.39 no.1 ,pp. 1 - 8 , 2017 , 0141-5387 ,

    초록

    Aim: To comparatively evaluate the properties of two BPA-free experimental adhesives (EXA, EXB) for lingual fixed retainer bonding versus a commercially available reference material (Transbond LR-TLR) based on BPA-compound. Materials and methods: The experimental materials were a flowable 60 per cent glass filler-filled UEDMA/TEGDMA flowable composite (EXB) and a 70 per cent glass filler-filled paste composite with PCDMA/UEDMA/TEGDMA co-monomers. The properties tested were degree of conversion (DC%), mechanical properties (Martens hardness-MH, elastic modulus-E IT , elastic index-n IT ), effect of prolonged (6 months) water storage (changes in Vickers microhardness-VHN) and pull-out strength employing a multi-stranded wire. Results: EXB showed the highest DC% (63.6 per cent), followed by EXA (50.5 per cent) and TRL (44.1 per cent), with all means differences being statistically significant ( P < 0.05). The statistical rankings of MH (MPa) and E IT (GPa) means were TLR (76.1MPa; 17.3GPa) > EXA (53MPa; 12.9GPa) > EXB (12.9MPa; 6.7GPa), whereas for n IT, EXB (40 per cent) > EXA (34.9 per cent), TLR (33.6 per cent). All materials were affected by prolonged water storage with significant differences among them in VHN. TLR was the most affected material (ΔVHN = −11 per cent), followed by EXA (ΔVHN = −6.8 per cent) and EXB (ΔVHN = −4.2 per cent). No statistically significant differences were found in the pull-out strength testing (24–24.2 N range) and failure mode (70–77 per cent mixed). Conclusion: Considering the differences between the two experimental materials, it may be concluded that the material containing the PCDMA/UEDMA/TEGDMA co-monomers may be used as an alternative to the control.

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  2. [해외논문]   Nanosilver coated orthodontic brackets: in vivo antibacterial properties and ion release   SCI SCIE

    Metin-Gursoy, Gamze (Departments of <sup>*</sup>Orthodontics and ) , Taner, Lale (Departments of <sup>*</sup>Orthodontics and ) , Akca, Gulcin (<sup>**</sup>Medical Microbiology, Faculty of Dentistry, Gazi University, Ankara, Turkey)
    European journal of orthodontics v.39 no.1 ,pp. 9 - 16 , 2017 , 0141-5387 ,

    초록

    Introduction: Silver nanoparticles are currently utilized in the fields of dentistry. The aim of this study was to evaluate the antibacterial properties and ion release of nanosilver coated orthodontic brackets compared to conventional brackets. Methods: Nanosilver coating process was applied to standard orthodontic brackets placed on the mandibular incisors of Wistar Albino rats in the study group and conventional brackets in the control group. Dental plaque, mucosal vestibular smears, saliva, and blood samples were collected from rats at various days. The amounts of nanosilver ions in blood and saliva were measured and microbiological evaluation was made for Streptococcus mutans . For testing cariogenicity, all rats were sacrificed at the end of 75 days under anaesthesia. Teeth were stained using a caries indicator, then the caries ratio was assessed. Results: Nanosilver coated orthodontic bracket favoured the inhibition of S.mutans on Day 30 and reduction of caries on the smooth surfaces. The nanosilver amounts in the saliva and serum samples were significantly higher in the study group on Day 7. Conclusion: It is suggested that nanosilver coated orthodontic brackets, as an antibacterial agent without patient compliance, could be helpful for the prevention of white spot lesions during fixed orthodontic treatment.

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  3. [해외논문]   Effects of fixed orthodontic treatment using conventional (two-piece) versus metal injection moulding brackets on hair nickel and chromium levels: a double-blind randomized clinical trial   SCI SCIE

    Khaneh Masjedi, Mashallah (<sup>1</sup>Department of Orthodontics, Faculty of Dentistry, Ahvaz Jundishapur University of Medical Sciences, Iran, ) , Haghighat Jahromi, Nima (<sup>1</sup>Department of Orthodontics, Faculty of Dentistry, Ahvaz Jundishapur University of Medical Sciences, Iran, ) , Niknam, Ozra (<sup>1</sup>Department of Orthodontics, Faculty of Dentistry, Ahvaz Jundishapur University of Medical Sciences, Iran, ) , Hormozi, Elham (<sup>1</sup>Department of Orthodontics, Faculty of Dentistry, Ahvaz Jundishapur University of Medical Sciences, Iran, ) , Rakhshan, Vahid (<sup>2</sup>Iranian Tissue Engineering and Graft Bank and Research Centre, Tehran University of Medical Sciences, Iran, and)
    European journal of orthodontics v.39 no.1 ,pp. 17 - 24 , 2017 , 0141-5387 ,

    초록

    Introduction: Although nickel and chromium are known as allergen and cytotoxic orthodontic metals, very few and controversial studies have assessed the effect of orthodontic treatment on their systemic levels especially those reflected by their best biomarker of exposure, hair. Additionally, metal injection moulding (MIM) brackets are not studied, and there is no study on systemic ion changes following their usage. Methods: In this double-blind randomized clinical trial, scalp hair samples of 24 female and 22 male fixed orthodontic patients [as two groups of conventional (two-piece) versus MIM brackets, n = 23×2] were collected before treatment and 6 months later. Randomization was carried out using a computer-generated random number table. The patients, laboratory expert, and author responsible for analyses were blinded of the bracket allocations. Hair nickel and chromium levels were measured using atomic absorption spectrophotometry. The effects of treatment, bracket types, gender, and age on hair ions were analysed statistically ( α = 0.05, 0.05, β ≤ 0.02). Results: In both groups combined ( n = 46), nickel increased from 0.1600±0.0890 µg/g dry hair mass (pre-treatment) to 0.3199±0.1706 (6th month). Chromium increased from 0.1657±0.0884 to 0.3066±0.1362 µg/g. Both of these increases were significant (paired t -test, P = 0.0000). Bracket types, age, and gender had no significant influence on ion levels ( P > 0.05). ANCOVA indicated different patterns of chromium increases in different genders ( P = 0.033) and ages ( P = 0.056). Limitations: Sample size determination should have accounted for the grouping as well. Conclusion: Hair nickel and chromium levels might increase about 185–200% after 6 months. They might not be affected by bracket types. Gender and age might not influence the baseline or 6th-month levels of both metals. Gender might however interact with orthodontic treatment, only in the case of chromium. Registration: The research is registered offline (thesis) and online (IR.AJUMS.REC.1394.516). Protocol: The protocol was pre-determined before any experiments begin. Funding: The study was self-funded by the authors.

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  4. [해외논문]   Radiographic technique and brackets affect measurements of proximal enamel thickness on mandibular incisors   SCI SCIE

    Ang, Amy Giok Phing (<sup>1</sup>Department of Orthodontics, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands, ) , Steegmans, Pauline Antoinette Josephine (<sup>2</sup>Department of Dentistry, University of Groningen, University Medical Centre Groningen, Centre for Dentistry and Oral Hygiene, Groningen, The Netherlands and ) , Kerdijk, Wouter (<sup>3</sup>Department of Public and Individual Oral Health, University of Groningen, University Medical Centre Groningen, Centre for Dentistry and Oral Hygiene, Groningen, The Netherlands ) , Livas, Christos (<sup>1</sup>Department of Orthodontics, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands, ) , Ren, Yijin (<sup>1</sup>Department of Orthodontics, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands,)
    European journal of orthodontics v.39 no.1 ,pp. 25 - 30 , 2017 , 0141-5387 ,

    초록

    Objective: To investigate the influence of radiographic film and tube positioning, the presence and the size of brackets on in vitro measurements of proximal enamel thickness of mandibular incisors on periapical radiographs aimed to aid planning of interproximal enamel reduction procedures in orthodontics. Materials and Methods: Eighty human mandibular incisors were assigned to sets of four and located in a customized base. Periapical radiographs were taken with the film positioned at three different angles (0°, 2°, and 5°) in relation to the frontal plane and the tube head positioned at five angles (0°, −2°, −5°, +2°, and +5°) in relation to the sagittal plane. The proximal enamel width was calculated by means of computerized image analysis and compared with measurements obtained at 0°. Statistical analysis was carried out to compare the enamel measurements on radiographs made with all angular combinations with and without the presence of brackets of different dimensions. Results: A significant difference ( P < 0.05) was found between the measurements of proximal enamel width obtained at the different angles in relation to the frontal and sagittal planes for all sets with or without brackets. The presence of brackets significantly affected the measured width only for the enamel side further away from the radiation source at the sagittal plane ( P < 0.05). Conclusion: Angular changes in taking periapical radiographs of mandibular incisors and the presence of brackets significantly affect interproximal enamel measurements made with image analysis software.

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  5. [해외논문]   Effectiveness of open bite correction when managing deleterious oral habits in growing children and adolescents: a systematic review and meta-analysis   SCI SCIE

    Feres, Murilo Fernando Neuppmann (<sup>1</sup>Department of Paediatric Dentistry and Orthodontics, Guarulhos University, Brazil, ) , Abreu, Lucas Guimarã (<sup>2</sup>Department of Paediatric Dentistry and Orthodontics, Federal University of Minas Gerais, Belo Horizonte, Brazil, ) , es (<sup>3</sup>Department of Orthodontics, University of North Parana, Londrina, Brazil and ) , Insabralde, Natalia Martins (<sup>3</sup>Department of Orthodontics, University of North Parana, Londrina, Brazil and ) , de Almeida, Marcio Rodrigues (<sup>4</sup>School of Dentistry, University of Alberta, Edmonton, Canada) , Flores-Mir, Carlos
    European journal of orthodontics v.39 no.1 ,pp. 31 - 42 , 2017 , 0141-5387 ,

    초록

    Background/objectives: Oral habits are common etiological factors for anterior open bites (AOBs) in growing children and adolescents. The objective of this review was to provide a literature synthesis evaluating the effectiveness of open bite correction in growing individuals with the use of habit-interception appliances. Search methods: Electronic searches were conducted on PubMed, Embase, Cochrane Library, Web of Sciences, Scopus, Google Scholar, Scielo, and Lilacs databases. Trials registries were consulted for ongoing trials, and a partial grey literature search was also conducted. Selection criteria: The selection criteria included controlled clinical trials enrolling growing subjects who underwent habit-interception orthodontic treatment to correct dental and/or skeletal AOB. Data collection analysis: Data was grouped and analysed descriptively. A meta-analysis was only possible regarding crib therapy effectiveness. Qualitative appraisal was performed according to Cochrane Risk of Bias tool for randomized clinical trials (RCTs) and the MINORS tool for non-randomized clinical trials (nRCTs). Results: Two RCTs and nine nRCTs were identified. Most of them presented relevant limitations. Crib therapy demonstrated to be effective (+3.1mm overbite correction). However, most of the dental effects are seemingly lost with time; and the skeletal effects are still controversial. Other habit-interception appliances, such as spurs, were not sufficiently investigated. Conclusions: Crib therapy appears to be effective on a short time basis. As for other habit-interception appliances, insufficient evidence could not provide reliable conclusions.

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  6. [해외논문]   A comparative assessment of enamel mineral content and Streptococcus mutans population between conventional composites and composites containing nano amorphous calcium phosphate in fixed orthodontic patients: a split-mouth randomized clinical trial   SCI SCIE

    Jahanbin, Arezoo (<sup>1</sup>Dental Research Center, Department of Orthodontics, School of Dentistry, Mashhad University of Medical Sciences, Iran, ) , Farzanegan, Fahimeh (<sup>2</sup>Oral & Maxillofacial Diseases Research Center, Department of Orthodontics, School of Dentistry, Mashhad University of Medical Sciences, Iran, ) , Atai, Mohammad (<sup>3</sup>Iran Polymer and Petrochemical Institute, Tehran, Iran, ) , Jamehdar, Saeed Amel (<sup>4</sup>Antimicrobial Resistance Research Center, Avicenna Research Institute, Mashhad University of Medical Sciences, Iran, and ) , Golfakhrabadi, Parvaneh (<sup>5</sup>Department of Orthodontics, School of Dentistry, Golestan University of Medical Sciences, Gorgan, Iran ) , Shafaee, Hooman (<sup>2</sup>Oral & Maxillofacial Diseases Research Center, Department of Orthodontics, School of Dentistry, Mashhad University of Medical Sciences, Iran,)
    European journal of orthodontics v.39 no.1 ,pp. 43 - 51 , 2017 , 0141-5387 ,

    초록

    Objectives: The aim of this ‘split-mouth design’ trial was to evaluate the effect of the nano amorphous calcium phosphate (NACP) containing composite on enamel mineral contents and streptococcus mutans population in fixed orthodontic patients. Design, setting, participants, and intervention: Randomized, prospective, single-center controlled trial. Twenty-four patients between the ages of 13–18 years participated in this study. The control and test sides were randomly selected by a coin toss (1:1 ratio). On the control side orthodontic brackets were bonded on the buccal surfaces of upper premolars and laterals using an orthodontic composite (Transbond XT), and on the study side NACP-containing composite was used. Outcome measures were the mineral content around the brackets and S.mutans count. The later were calculated in the plaque around the brackets by real-time PCR at 3 months, and 6 months after the initiation of treatment. All stages of the study were blind using coding system. Paired t -test and repeated measurements were used for data analysis. Results: In the third and sixth month, the bacterial population was significantly lower in the study side than the control side ( P = 0.01 and 0.000).The mineral content of the study side was significantly higher than the controls, 6 months after brocket bonding ( P = 0.004). There were no significant differences between the premolars and lateral teeth for all measurements. Limitations: This research was performed in a single-center by one experienced clinician. Conclusion: NACP-containing composites have the potential to inhibit mineral content loss and S.mutans colonization around orthodontic brackets during fixed orthodontic treatments. Trial registration: This trial was not registered. Protocol: The protocol was not published before trial commencement.

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  7. [해외논문]   Facial soft tissue changes during the pre-pubertal and pubertal growth phase: a mixed longitudinal laser-scanning study   SCI SCIE

    Primozic, Jasmina (<sup>1</sup>Department of Orthodontics and Jaw Orthopaedics, Medical Faculty, University of Ljubljana, Slovenia and ) , Perinetti, Giuseppe (<sup>2</sup>Department of Medical, Surgical and Health Sciences, University of Trieste, Italy ) , Contardo, Luca (<sup>2</sup>Department of Medical, Surgical and Health Sciences, University of Trieste, Italy ) , Ovsenik, Maja (<sup>1</sup>Department of Orthodontics and Jaw Orthopaedics, Medical Faculty, University of Ljubljana, Slovenia and)
    European journal of orthodontics v.39 no.1 ,pp. 52 - 60 , 2017 , 0141-5387 ,

    초록

    Background/objectives: Facial soft tissues changes during growth roughly tend to mimic the underlying hard tissues, but not completely. The aim of this mixed longitudinal study was to assess facial growth among pre-pubertal and pubertal subjects without malocclusion using a non-invasive three-dimensional laser scanning system. Subjects/methods: Fifty-nine subjects (30 females and 29 males) aged at baseline 5.4–8.9 years with normal occlusion were clustered into the younger, older pre-pubertal, and pubertal groups according to age and the absence/presence of a standing height growth spurt. Three-dimensional facial images were obtained using laser scanners for five consecutive years. Several transversal, sagittal, and vertical parameters were assessed for between and within group comparisons. Results: Significant overall changes of almost all parameters were seen within each group ( P < 0.05) without any group differences ( P > 0.05). The younger pre-pubertal group showed greater annual growth rates of lip prominence; both pre-pubertal groups showed greater rates in facial middle third height. The pubertal group showed greater annual rates in facial profile angle changes during the growth peak. Limitations: A high standing height increment (7cm) was used as the threshold for subject allocation in the pubertal group. Conclusions: Soft tissue facial growth has generally similar amounts and rates irrespective of the pubertal growth spurt. Pre-pubertal subjects show greater annual rates of facial middle third height changes while pubertal subjects show greater annual rates of chin protrusion.

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  8. [해외논문]   Sleep bruxism in adolescents: a systematic literature review of related risk factors   SCI SCIE

    Castroflorio, Tommaso (<sup>1</sup>Department of Surgical Sciences, Specialization School of Orthodontics, Dental School, University of Torino, Italy, ) , Bargellini, Andrea (<sup>1</sup>Department of Surgical Sciences, Specialization School of Orthodontics, Dental School, University of Torino, Italy, ) , Rossini, Gabriele (<sup>1</sup>Department of Surgical Sciences, Specialization School of Orthodontics, Dental School, University of Torino, Italy, ) , Cugliari, Giovanni (<sup>3</sup>Department of Statistics and Quantitative Methods, University of Milano-Bicocca, Italy ) , Deregibus, Andrea (<sup>1</sup>Department of Surgical Sciences, Specialization School of Orthodontics, Dental School, University of Torino, Italy,)
    European journal of orthodontics v.39 no.1 ,pp. 61 - 68 , 2017 , 0141-5387 ,

    초록

    Background: Multiple risk factors have been associated to sleep bruxism (SB). Nevertheless, there are still many unsolved issues concerning the etiology of SB that have consequences on the clinical management strategies. Objective: Systematically review the literature to assess the relationship between risk factors and SB symptoms in adolescents (age 11–19 years). Search methods and selection criteria: PubMed, Embase, Scopus, Cochrane Oral Health Group’s Trial Register and Cochrane Register of Controlled Trials, Web of Science, LILACs, and SciELO were searched to identify all peer-reviewed articles potentially relevant to the review. Data collection and analysis: The risk of bias was assessed according to the guidelines from the Cochrane handbook for systematic reviews of interventions, with reporting in agreement to the preferred reporting items for systematic reviews and meta-analyses guidelines. Results: Four out of the 4546 initially identified articles were selected. According to the grading of recommendations assessment, development and evaluation assessment (GRADE), the magnitude of agreement was almost perfect for all checklist items. Sleep disturbances, and snoring in particular, headache, jaw muscle fatigue, and tooth wear seem to be associated to SB in adolescents from 11 to 19 years old. Limitations: Despite the large interest of the scientific community in the field of oral parafunctions, only four articles met the eligibility criteria. Furthermore only associations and not definite cause–effect relationships were highlighted in the selected articles. Conclusions: Sleep disturbances presented the strongest association with SB while very few occlusal features had a moderate association. As a common sense the investigation of sleep respiratory disorders could be of great help in the management of SB in adolescents.

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  9. [해외논문]   A survey of general dentists regarding orthodontic retention procedures   SCI SCIE

    Habegger, Michael (<sup>1</sup>Department of Orthodontics and Dentofacial Orthopedics, University of Bern, Switzerland, ) , Renkema, Anne-Marie (<sup>1</sup>Department of Orthodontics and Dentofacial Orthopedics, University of Bern, Switzerland, ) , Bronkhorst, Ewald (<sup>2</sup>Departments of Orthodontics and Dentofacial Biology and ) , Fudalej, Piotr S. (<sup>1</sup>Department of Orthodontics and Dentofacial Orthopedics, University of Bern, Switzerland, ) , Katsaros, Christos (<sup>1</sup>Department of Orthodontics and Dentofacial Orthopedics, University of Bern, Switzerland,)
    European journal of orthodontics v.39 no.1 ,pp. 69 - 75 , 2017 , 0141-5387 ,

    초록

    Aim: To explore 1. how Swiss general dentists deal with complications associated with fixed orthodontic retainers, 2. collaboration between general dentists and orthodontists with regards to the organization and responsibility for long-term follow-up of orthodontic retainers, and 3. the need for standardized clinical guidelines regarding orthodontic retention. Methods: A structured questionnaire was sent to 201 randomly selected dentists. They were asked about their experience with retainers, opinions regarding the advantages and disadvantages of different types of retainers, responsibility for patients wearing bonded retention and the communication between orthodontists and general dentists. Statistical analysis was carried out using SPSS software. Results: The response rate was 61 per cent. About 55 per cent of the respondents had had experience with bonding fixed retainers and even more were familiar with their follow-up and repair. In case of complications, dentists usually contacted orthodontists according to the following rule: the more severe the complication, the more intense the communication. Most dentists hesitated to remove retainers when requested to do so by the patient and attempted to convince them to continue wearing them. Retainers bonded to all six anterior teeth were considered more efficient than those bonded to canines only; however, possible side effects (e.g. unwanted changes of the torque) were not well known. 66.4 per cent respondents were willing to take responsibility for patients in retention as early as 6 months after retainer placement. 93.2 per cent respondents would welcome the establishment of standardized guidelines. Conclusions: Swiss general dentists have good knowledge of orthodontic retention and follow-up procedures. Nevertheless, introduction of clinical guidelines including information on the possible side-effects of bonded retention is justified.

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  10. [해외논문]   Stability determinants of bone-borne force-transmitting components in three RME hybrid expanders—an in vitro study   SCI SCIE

    Walter, Andre (<sup>1</sup>Department of Orthodontics and Dentofacial Orthopaedics, School of Dentistry, Universitat Internacional de Catalunya, Barcelona, Spain, ) , Wendl, Brigitte (<sup>2</sup>Department of Clinical Orthodontics, Medical University Clinic, Graz, Austria, ) , Ploder, Oliver (<sup>3</sup>Department of Oral and Maxillofacial Surgery, Academic Teaching Hospital, Feldkirch, Austria and ) , Mojal, Sergi (<sup>4</sup>Statistical analysis and research, Instituto municipal de Investigaciones Mèédicas (IMIM), Hospital del Mar d′Investigaciones Mèéèdiques, Barcelona, Spain ) , Puigdollers, Andreu (<sup>1</sup>Department of Orthodontics and Dentofacial Orthopaedics, School of Dentistry, Universitat Internacional de Catalunya, Barcelona, Spain,)
    European journal of orthodontics v.39 no.1 ,pp. 76 - 84 , 2017 , 0141-5387 ,

    초록

    Background: The aim was to test which component [wire arm, connecting abutment attachment, and orthodontic mini-implant (OMI)] of the force-transmitting system (FTS) in the anterior palate of three commonly used hybrid expanders (HEs; WILMES-HE, LUDWIG-HE, and WINSAUER-HE) deforms under increasing load. Materials and methods: Crude single and double wire arms were tested individually. Non-opening of the maxillae halves was simulated in artificial bone blocks with single wire and double wire FTS specimens. OMIs were inserted 8mm and underwent 6mm of continuous static lateral loading. Deformation angles were measured (X-ray, n = 6) at 0, 3 and 6mm feed. OMIs and abutments were scan electron microscope (SEM) evaluated. Results: After 1.0mm of loading, the single wire arm of all FTS deformed between 63.4 (16.5) N and 76.2 (18.4) N, and the double wire arm of reinforced FTS (wires positioned ‘side by side’) deformed after 1.0mm between 110.0 (18.4) N and 134.8 (22.3) N. The crude single wire resisted 89 (5.1) N until plastic deformation, whereas the crude double wire positioned ‘on top of each other’ resisted 438 (21.3) N. At 6mm loading, the reinforced WINSAUER-HE FTS withstood a maximum load of 320.9 (31.1) N and the reinforced LUDWIG-HE FTS 19% less, both under great deformation of double wires and OMIs. The screw-fixated WILMES-HE FTS abutment attachment (overlapping OMI head 34%) detached around 250N. The bonded WINSAUER-HE and LUDWIG-HE abutment attachments did not detach. Nor did the modified bonded plus the modified screw-fixated WILMES-HE abutment attachment when overlapping 100%. Conclusion: Early OMI and single wire arm deformation in HEs are crucial for unsuccessful RME in more mature maxillae. Double wire arms should be obligatory. OMIs with inner diameter greater 1.36mm are recommended. One hundred per cent overlapping abutment attachments do not detach.

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