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Comparison of shear bond strengths of ceramic brackets after different time lags between lasing and debonding

Tozlu, M. | Oztoprak, M.O. | Arun, T.

Article | 2012 | Lasers in Medical Science27 ( 6 ) , pp.1151 - 1155

Laser use is effective in the debonding of ceramic brackets. However, a standardization of the laser debonding techniques used has not yet been implemented. The purpose of this study was to evaluate the effect of the time lag elapsed between lasing and shearing on debonding of ceramic brackets. One hundred polycrystalline ceramic brackets were placed on human premolar teeth, which were randomly divided into five groups of 20. One group was assigned as the control. The Er-YAG laser was applied on each bracket in four experimental groups at 5 W for 6 s with the scanning method. Debonding was performed 1 s, 18 s, 30 s, or 60 s after la . . .ser exposure. Shear bond strengths and adhesive remnant index scores were measured. Statistically significant difference was observed between the control and experimental groups when the data for the shear bond strengths was considered (p < 0.05). Adhesive remnant index scores of the groups were not statistically different (p > 0.05). Debonding ceramic brackets after 18 s when lased 6 s using an Er-YAG laser with the scanning method is safe and also suitable for clinical use since three brackets can be debonded at a time in succession. © 2011 Springer-Verlag London Ltd Daha fazlası Daha az

Perception of pain and discomfort during tooth separation.

Nalbantgil, D. | Cakan, D.G. | Oztoprak, M.O. | Arun, T.

Article | 2009 | Australian orthodontic journal25 ( 2 ) , pp.110 - 115

OBJECTIVES: To evaluate patients' perceptions of pain and discomfort during tooth separation and to compare the effectiveness of brass wire and elastomeric separators. METHODS: The participants were 87 adults with a mean age of 22.1 +/- 1.9 years. Elastomeric and brass wire separators were inserted mesial and distal to upper right (elastomeric separators) and upper left first molars (brass wire separators) in each subject. After seven days, the amount of tooth separation was measured with a leaf gauge, and pain perception and discomfort were evaluated with a visual analogue scale and questionnaire. RESULTS: The elastomeric separator . . .s produced significantly more separation than the wire separators. There was a statistically significant difference in the subjects' perceptions of pain and discomfort at rest and during chewing between the different separators (p < 0.001). In general, the brass wire separators caused the greatest pain and discomfort immediately after insertion. Pain from the wire separators subsided over seven days, whereas elastomeric separators caused the greatest pain on the first two days after insertion. Eating was negatively influenced by the separation in 61 per cent of the subjects on the first day. On the other hand, other daily activities were affected minimally. CONCLUSIONS: The different levels of pain and discomfort caused by these separators, together with their advantages and disadvantages, can help the clinician to choose an appropriate separator. Patients should be warned that pain due to separation may affect their chewing, social life, school work and sleeping. Analgesics and soft food are recommended following placement of separators Daha fazlası Daha az

Effects of different application durations of ER:YAG laser on intrapulpal temperature change during debonding

Nalbantgil, D. | Oztoprak, O. | Tozlu, M. | Arun, T.

Article | 2011 | Lasers in Medical Science26 ( 6 ) , pp.735 - 740

This study was done to determine the amount of lasing time required to remove ceramic brackets safely without causing intrapulpal damage by using Er:YAG laser with the scanning method. Part 1: 80 bovine mandibular incisors with ceramic brackets were randomly assigned into four groups of 20 as one control and three study groups. In the study groups, brackets were debonded after lasing for 3, 6, and 9 s, whereas debonding was performed without lasing in the control group. Shear bond strengths and ARI scores were also measured. Part 2: 30 human premolars with ceramic brackets were randomly divided into three groups of ten, as 3, 6, and . . . 9 s of lasing durations. Intrapulpal temperature was measured at the same lasing times by a thermocouple. Statistically significant lower shear bond strengths were found in study groups compared to the control. A negative correlation was seen between the bond strengths and ARI scores in such a way that, as the shear bond strengths decreased, the ARI scores increased. Temperature increases for all the study groups were measured below the 5.5§C benchmark. All lasing times were effective for debonding without causing enamel tear outs or bracket failures. The temperature proportionally increased with the extension of the lasing duration. Sixsecond lasing by the scanning method using Er:YAG laser was found to be the most effective and safest way of removing the ceramic brackets without causing damage to the enamel and pulpal tissues. © Springer-Verlag London Ltd 2010 Daha fazlası Daha az

Nickel and Chromium Levels in the Saliva and Serum of Patients with Fixed Orthodontic Appliances

Agaoglu, G. | Arun, T. | Izgü, B. | Yarat, A.

Article | 2001 | Angle Orthodontist71 ( 5 ) , pp.375 - 379

The aim of this study was to evaluate the concentrations of nickel and chromium ions in salivary and serum samples from patients treated with fixed orthodontic appliances. A second aim of this study was to determine any significant changes in these concentrations during any period of the treatment time. Saliva and blood samples were collected from 100 patients ranging in age from 12 to 33 years. Twenty samples from each group were obtained. The groups were as follows: In the first group, saliva and blood samples were collected before insertion of the fixed appliances. In the second, third, fourth, and fifth groups, samples were coll . . .ected at 1 week, 1 month, 1 year, and 2 years after appliance insertion. The serum was prepared by centrifuging the blood samples at 3000 rpm for 10 minutes. The fixed appliances consisted of an average of 4 bands and 20 bonded brackets. No palatal or lingual appliances welded to bands or extraoral auxiliary appliances were used. The spectrophotometric determinations were carried out using electrothermal atomic absorption spectrophotometry. The results indicated certain differences in the amounts of nickel and chromium released from fixed orthodontic appliances during different periods of treatment. The Mann-Whitney U-test from the SPSS statistics program was used to analyze the significance of the differences between no-appliance samples and those obtained with the appliances present. In the serum, there were statistically significant increases in ion concentration in the second-year groups. In saliva samples, nickel and chromium reached their highest levels in the first month and decreased to their initial level in the rest of the groups. It can be concluded that fixed orthodontic appliances release measurable amount of nickel and chromium when placed in the mouth, but this increase doesn't reach toxic levels for nickel and chromium in the saliva and serum Daha fazlası Daha az

A cephalometric comparative study of class II correction with Sabbagh universal spring (SUS2) and forsus FRD appliances

Oztoprak, M.O. | Nalbantgil, D. | Uyanlar, A. | Arun, T.

Article | 2012 | European Journal of Dentistry6 ( 3 ) , pp.302 - 310

Objective: The purpose of this clinical prospective study was to compare the dentofacial changes produced by the Sabbagh Universal Spring (SUS2) and Forsus FRD appliances in late adolescent patients with Class II malocclusion, and quantify them in comparison with an untreated group. Method: The study was carried out on 59 patients with skeletal and dental Class II malocclusion due to retrognatic mandible. Among these, 20 were treated with SUS2, 20 were treated with FRD, and no treatment was done to 19 subjects as the control group. 36 cephalometric landmarks were identified on each lateral cephalometric radiograph. Results: The effe . . .cts of both appliances wer dentoalveolar and no significant vertical and sagittal skeletal effect on maxilla and mandible was achieved. Theretrusion and extrusion of the maxillary incisors as well as the protrusion and intrusion of mandibular incisorswere found to be statistically significant in both treatment groups. Soft tissue profile improvement was limitedin both treatment groups. Conclusions: Both appliances corrected Class II discrepancies through dentoalveolar changes; however lower incisor proclination was more prominent with the Forsus FRD Daha fazlası Daha az

Prevention of demineralization around orthodontic brackets using two different fluoride varnishes

Nalbantgil, D. | Oztoprak, M.O. | Cakan, D.G. | Bozkurt, K. | Arun, T.

Article | 2013 | European Journal of Dentistry7 ( 1 ) , pp.41 - 47

Objective: This in-vitro study was done to evaluate the effects of two different seal materials, Duraflor™ and Enamel Pro® Varnish, on enamel demineralization adjacent to orthodontic fixed appliances. Methods: Seventy-two extracted solid premolars were allocated to three groups as one control and two study groups after brackets were placed and bonded with TransbondTM XT. The control group received no topical fluoride application after bonding, whereas in the study groups two fluoride varnishes, Enamel Pro® Varnish and Duraflor™ were applied on the teeth adjacent to brackets. All specimens were then immersed separately in demineraliz . . .ation solution for 96 hours at constant temperature. Demineralization of the enamel surface was evaluated quantitatively by cross-sectional microhardness testing: indentations were made at the edge of the bracket base (0 µm) and at 100 and 200 µm distant from it. In all of these positions, 5 indentations were made at 10, 20, 40, 70 and 90 µm of depths from the external surface of the enamel. Results: The results revealed that, Enamel Pro® Varnish and Duraflor™ group values are higher than the values of control group at every depth. The differences between the depths showed that the microhardness values decreased significantly when the depth increased. In the control group, more demineralization occurred in every indentation compared to the study group. Conclusion: Duraflor™ and Enamel Pro® Varnish can be considered for use in clinic as an effective method to prevent or reduce demineralization during orthodontic treatment, especially in patients with poor oral hygiene Daha fazlası Daha az

The role of cervical headgear and lower utility arch in the control of the vertical dimension

Ülger, G. | Arun, T. | Sayinsu, K. | Isik, F.

Article | 2006 | American Journal of Orthodontics and Dentofacial Orthopedics130 ( 4 ) , pp.492 - 501

Introduction: This study was carried out to evaluate the treatment changes in skeletal and dental parameters in growing patients. Methods: The sample consisted of 24 subjects with Class II Division 1 malocclusion. Half of the patients were treated with cervical headgear alone (group C, n = 12), and the other half received a combination of cervical headgear and lower utility arch (group CU, n = 12). The treatment groups were compared with a matched untreated control group (n = 12). The mean ages of the subjects at the beginning of the study were 8.85 ± 1.19 years in group C, 9.23 ± 0.76 years in group CU, and 8.62 ± 0.78 years in the . . . control group. The cervical headgear was used with an expanded inner bow and a 15° to 20° upward bend of the longer outer bow, worn 12 to 14 hours a day, with a force of 450 to 500 g per side. The lower utility arch was designed as described in the bioprogressive technique. Treatment changes were assessed on lateral cephalometric radiographs. Results: The cervical headgear produced Class II correction through maxillary orthopedic and orthodontic changes. Anterior face height increased more in the treatment groups than in the control group. The treatment groups also displayed statistically significant increases in ramus height. Due to these effects, mandibular plane orientation stayed relatively unchanged. There was no opening rotation of the mandible in the treatment groups. The lower utility arch produced intrusion and lingual tipping of the mandibular incisors and distal tipping without extrusion of the mandibular molars. The treatment groups showed significant anterior descents of the palatal plane. Maxillary molar total extrusion produced by cervical headgear treatment was an average of no more than 1 mm as compared with the control group. The utility arch did not appear to influence mandibular rotational response. © 2006 American Association of Orthodontists Daha fazlası Daha az

Treatment of Condylar Hypoplasia with Distraction Osteogenesis: A Case Report

Arun, T. | Kayhan, F. | Kiziltan, M.

Article | 2002 | Angle Orthodontist72 ( 4 ) , pp.371 - 376

This report describes the surgical-orthodontic treatment procedures of a patient with condylar hypoplasia. Condylar hypoplasia is a major factor in any facial abnormality in a growing child. This case report describes a patient with a facial anomaly with an acquired unilateral condylar hypoplasia. His asymmetry was corrected by using functional therapy for the correction of muscle tonus and distraction osteogenesis for lengthening the mandibular ramal height. Fixed orthodontic appliances were used for conventional orthodontic therapy and final occlusal adjustment.

Periodontal status of ectopic canines after orthodontic treatment

Evren, A.D. | Nevzatoglu, S. | Arun, T. | Acar, A.

Article | 2014 | Angle Orthodontist84 ( 1 ) , pp.18 - 23

Objective: To evaluate the periodontal health and tooth vitality of palatally impacted and buccal ectopic maxillary canines after completion of orthodontic treatment. Materials and Methods: Fifteen patients who had unilateral, palatally impacted canines and 15 patients who had unilateral, buccal ectopic canines comprised the subjects of the study. Clinical and radiographic data was collected by recalling the patients in both groups after a mean period of 3.82 ± 1.54 years following completion of their orthodontic treatment. In both groups, the contralateral, normally placed canines served as controls. Results: Palatally impacted can . . .ines had greater pocket depths, higher gingival levels, higher electric pulp testing scores, and reduced bone levels compared to their contralaterals. Buccal ectopic canines had increased plaque and gingival bleeding index, greater pocket depths, reduced attached gingival width, higher gingival levels, increased clinical crown lengths, and higher electric pulp testing scores compared to their contralaterals. Buccal ectopic canines had lower electric pulp testing scores and higher bone levels compared to palatally impacted canines. Conclusion: All ectopic canines had increased plaque and gingival bleeding index, greater pocket depths, reduced attached gingival width, higher gingival levels, increased crown lengths, higher electric pulp testing scores, and reduced bone levels compared to their contralaterals. © 2014 by The EH Angle Education and Research Foundation, Inc Daha fazlası Daha az

FEM analysis of a new miniplate: Stress distribution on the plate, screws and the bone

Nalbantgil, D. | Tozlu, M. | Ozdemir, F. | Oztoprak, M.O. | Arun, T.

Article | 2012 | European Journal of Dentistry6 ( 1 ) , pp.9 - 15

Objectives: Non-homogeneous force distribution along the miniplates and the screws is an unsolved question for skeletal anchorage in orthodontics. To overcome this issue, a miniplate structure was designed featuring spikes placed on the surface facing the cortical bone. The aim of this study was to examine and compare the force distribution of the newly designed plate-screw systems with the conventional one. Methods: A model of bone surface with 1.5 mm cortical thickness, along with the two newly designed miniplates and a standard miniplate-screw were simulated on the three-dimensional model. 200 g experimental force was applied to . . .the tip of the miniplates and the consequential effects on the screws and cortical bone was evaluated using three-dimensional finite element method. Results: As a result of this finite element study, remarkably lower stresses were observed on the screws and the cortical bone around the screws with the newly designed miniplate when compared with the conventional one. Conclusion: The newly designed miniplate that has spikes was found effective in reducing the stress on and around the screws and the force was distributed more equivalently Daha fazlası Daha az

Effect of blood and saliva contamination on shear bond strength of brackets bonded with 4 adhesives

Öztoprak, M.O. | Isik, F. | Sayinsu, K. | Arun, T. | Aydemir, B.

Article | 2007 | American Journal of Orthodontics and Dentofacial Orthopedics131 ( 2 ) , pp.238 - 242

Introduction: The purpose of this study was to assess the effect of blood and saliva contamination on the shear bond strength of 4 orthodontic adhesives. Methods: Four adhesives (Transbond XT primer [3M Unitek, Monrovia, Calif], Transbond Plus self-etch primer [3M Unitek], Assure hydrophilic primer [Reliance, Itasca, Ill], and SmartBond cyanoacrylate [Gestenco, Gothenburg, Sweden]) were used to bond stainless steel maxillary central incisor brackets to 120 bovine permanent mandibular incisors. The teeth were randomly divided into 12 groups of 10 specimens, and each primer-adhesive combination was tested under different enamel condit . . .ions: dry, and blood and saliva contamination after priming. Shear forces were applied to the samples with a testing machine. Bond strengths were measured in megapascals. Results: Statistical evaluations showed that the shear bond strength of the SmartBond cyanoacrylate adhesive group was significantly lower than all other groups; however, it was the only adhesive that was not affected by contamination. Saliva and blood contamination resulted in significant drops in shear bond strengths of the Transbond XT and Assure groups. Transbond Plus self-etch primer was also negatively affected by blood contamination, although it was suitable for bonding with saliva contamination. © 2007 American Association of Orthodontists Daha fazlası Daha az

Comparison of facial soft tissue measurements on three-dimensional images and models obtained with different methods

Germec-Cakan, D. | Canter, H.I. | Nur, B. | Arun, T.

Article | 2010 | Journal of Craniofacial Surgery21 ( 5 ) , pp.1393 - 1399

Aim: The aim of this study was to compare the clinical facial soft tissue measurements with the measurements of facial plaster cast, three-dimensional scanned facial plaster cast, 3-dimensional digital photogrammetrical images, and three-dimensional laser scanner images. Materials and Methods: Three-dimensional facial images of 15 adults were obtained with stereophotogrammetry and a three-dimensional laser scanner. Facial models of subjects were obtained using silicone impression and were scanned. Landmarks were marked on the subjects and plaster casts, digitized on three-dimensional models, and measured in Mimics 12.0 software (Mat . . .erialise's Interactive Medical Image Control System, Leuven, Belgium). Results: No statistically significant differences were found between all three-dimensional measurement methods in mouth width, philtrum median height, and nasal width. Comparison of clinical measurements with facial plaster cast measurements revealed that philtral width, nasal tip protrusion, and right lip and nostril heights were wider and longer in clinical measurements than in facial plaster cast measurements. Comparison of clinical measurements to the laser scanned and stereophotogrammetric model measurements revealed that philtrum lateral and lip heights and philtral width were significantly different between methods. When laser scanned and stereophotogrammetric measurements were compared, significant differences were observed in lip and nostril heights. Conclusions: Facial impression may be problematic owing to the depression caused by the impression material especially on the tip of the nose. Laser scanning is not sensitive enough to visualize the deeper indentations such as nostrils. Stereophotogrammetry is promising for three-dimensional facial measurements and even will be better when color identification between mucocutaneous junctions of the lip region is achieved. Copyright © 2010 by Mutaz B. Habal, MD Daha fazlası Daha az

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