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Öğe Effect of Complete Dentures on Dynamic Measurement of Changing Head Position: A Pilot Study(Mosby, Inc, 2003) Üşümez, Aslıhan; Üşümez, Serdar; Orhan, MetinStatement of problem. Complete dentures contribute significantly to the facial esthetics of edentulous patients. However, information as to the effect of complete dentures oil the natural position of the head is limited. Purpose. The purpose of this Pilot study was to evaluate the immediate and 30-day effect of wearing complete dentures on the dynamic natural head position measured during walking. Material and methods. The sample consisted of a volunteer group of 16 patients, 8 women and 8 men, who received new complete dentures. The ages of the subjects ranged from 45 to 64 years (mean = 52 years). Dynamic measurement of head posture was carried out by a specially constructed inclinometer device. Each Subject in turn was fitted with the inclinometer system and instructed to walk in a relaxed manner for 5 minutes. The data, measured as degrees, were stored in a pocket data logger. This procedure was repeated before insertion of dentures (T1), immediately after insertion of dentures (T2), and 30 days after insertion of dentures (T3). Stored dynamic head Posture data were transferred to computer for analysis. The means of the measurements were statistically compared with Friedman and following Wilcoxon tests (alpha =.05). Results. Twelve of 16 (75%) subjects showed an average of 4.6 degrees of cranial extension immediately after insertion of dentures. Six (37.5%) subjects showed an average of 6.4 degrees of cranial flexion, and 8 (50%) Subjects showed an average of 5.2 degrees of cranial extension at T3 relative to the T1 measurement. Dynamic head Posture measurements of the other 2 Subjects remained unchanged. There were significant differences between different measurements of dynamic head posture positions (P<.025). However, only, the T1 and T2 measurements were significantly different (P<.015). Conclusion. The findings indicate that the statistically significant average extension 4.6 degrees in Subjects immediately after insertion of complete dentures was not stable after a 30-day evaluation period and did not produce any statistically significant change. The overall effect of wearing dentures was an irregular flexion or extension pattern on dynamic head posture. (J Prosthet Dent 2003;90:394-400.).Öğe Effect of Rapid Maxillary Expansion on Nocturnal Enuresis(E H Angle Education Research Foundation, Inc, 2003) Üşümez, Serdar; İşeri, H.; Orhan, Metin; Başçiftçi, Faruk AyhanOne of the effects of rapid maxillary expansion (RME) is a reduction in nighttime bedwetting. The aim of this prospective study was to investigate the effects of RME on nocturnal enuresis (NE) in children who are liable to psychosocial stress conditions. Eight children (six boys and two girls) who had not responded to different conventional medical treatments were included in the. study. The subjects were between eight and 11 years of age,with a mean age of nine years five months, and were residents of a government orphanage. All the children wet the bed at least one time every night and previously had been subjected to unsuccessful conventional treatment modalities. Maxillary expansion was performed using a rigid acrylic RME device. Lateral and PA cephalometric films and dental casts were used in the assessment of the dentofacial and nasopharyngeal structures. Data were analyzed using a paired t-test. In seven of the eight children, remarkable improvement was observed in NE after three to six mm RME. At the end of eight months observation, the mean rate of improvement in bed-wetting in the seven successful subjects was 74.2% (57.6-87.5%). The findings also indicated significant changes in the nasomaxillary structures and nasopharyngeal airway dimensions with the use of RME. However, none of the subjects became completely dry, and the disorder is probably multicausal including psychological emotions and tensions. This study demonstrated that RME treatment could cause relief for the enuretic children. However, the long-term success rate is still questionable.Öğe En Masse Retraction of Maxillary Anterior Teeth with Anterior Headgear(1997) Güray, Enis; Orhan, MetinIn the treatment of the first premolar extraction cases with certain techniques, incisor retraction is realized after canine distalization. In maximum anchorage cases, retraction of anterior segments require more posterior anchorage. This treatment concept is still valid, however, the difficult anchorage control is considered a major drawback. The purpose of this study is to introduce our technique for the "en masse" retraction of maxillary anterior teeth after first premolar extraction and discuss its effects. The technique consists of the application of extraoral traction on canines, followed by banding of maxillary anterior teeth, to form them as a mass. Advantages of our mechanics are as follows: (1) Anterior headgear may have the advantage of retracting anterior teeth with minimum strain on posterior anchorage. (2) The adjustability of the outer bow in relation to the premaxilla's center of resistance, provides effective desired movements. (3) Intrusion and torque control are achieved in the course of anterior segment retraction.Öğe ''En Masse'' Retraction of Maxillary Anterior Teeth with Anterior Headgear(MOSBY-YEAR BOOK INC, 1997) Güray, Enis; Orhan, MetinIn the treatment of the first premolar extraction cases with certain techniques, incisor retraction is realized after canine distalization. In maximum anchorage cases, retraction of anterior segments require more posterior anchorage. This treatment concept is still valid, however, the difficult anchorage control is considered a major drawback. The purpose of this study is to introduce our technique for the ''en masse'' retraction of maxillary anterior teeth after first premolar extraction and discuss its effects, The technique consists of the application of extraoral traction on canines, followed by banding of maxillary anterior teeth, to form them as a mass. Advantages of our mechanics are as follows: (1) Anterior headgear may have the advantage of retracting anterior teeth with minimum strain on posterior anchorage, (2) The adjustability of the outer bow in relation to the premaxilla's center of resistance, provides effective desired movements. (3) Intrusion and torque control are achieved in the course of anterior segment retraction.Öğe Etching of Enamel for Direct Bonding With an Er,cr : Ysgg Hydrokinetic Laser System(Int Amer Assoc Dental Researchi a D R/a a D R, 2002) Üşümez, Serdar; Orhan, Metin; Üşümez, Aslıhan[Abstract not Available]Öğe Inclinometer Method for Recording and Transferring Natural Head Position in Cephalometrics(Mosby, Inc, 2001) Üşümez, Serdar; Orhan, MetinThe purposes of this study were (1) to construct a device to record natural head position and transfer it to the cephalostat, (2) to assess its clinical use, and (3) to evaluate the reproducibility of lateral cephalograms taken with the device. The device, incorporated into a pair of eyeglass frames, included 2 tilt sensors to measure pitch and roll of the head. The natural head positions of 20 subjects were established 10 times by self balance and mirror position, recorded with the device, and reproduced in the cephalostat by using the average of these 10 measurements. Three lateral cephalograms were obtained in this manner at 30-minute intervals. The first 2 films were made with the subject wearing the device to assess the reproducibility of the recorded position in the cephalostat by the inclinometer. During exposure of the third film, the device was not worn, and this film was used to determine the stability of the established position when the inclinometer was removed. The results revealed method errors of 0.6 degrees (SD, 0.9) between the first 2 sets of radiographs with a correlation coefficient of 0.985. Method errors between the first and third and the second and third sets were 0.6 degrees (SD, 0.8) and 0.7 degrees (SD, 1), respectively, with correlation coefficients of 0.989 and 0.982. The reproducibility of the method was high, and the system was clinically practical for both recording and transferring natural head position in cephalometrics. This technique should make it possible to measure and reproduce head position accurately. Minimizing the size of the device, making it radiolucent, and integrating it into the radiographic device will make it more versatile and decrease error.Öğe Laser Etching of Enamel for Direct Bonding With an Er,Cr : YSGG Hydrokinetic Laser System(MOSBY, INC, 2002) Üşümez, Serdar; Orhan, Metin; Üşümez, AslıhanIrradiation of enamel with laser energy changes the physical and chemical characteristics of the enamel surface, and these alterations hold promise for the conditioning of enamel for bonding procedures. This laboratory study examined the influence of laser irradiation of enamel at 2 different power settings with an erbium, chromium: yttrium, scandium, gallium, garnet (Er,Cr:YSGG) hydrokinetic laser system (Millennium System, Biolase Technology, Inc; San Clemente, Calif) on the shear bond strength of orthodontic appliances and compared these with that of acid-etching. The prepared surfaces of 40 noncarious, intact, extracted premolars were exposed to laser energy: 20 teeth at 2-W setting (5.6 J/cm(2)) and 20 teeth at 1-W setting (2.7 J/cm(2)) of the commercial laser unit. Twenty teeth were etched with 37% orthophosphoric acid. Brackets were bonded with an orthodontic no-mix adhesive, and shear bond strength was determined with a universal testing machine. Data were analyzed with Kruskall-Wallis and Mann-Whitney U tests. Etched and restored surfaces of an acid-etched tooth and a 2-W laser-irradiated tooth were examined with scanning electron microscopy (SEM). Laser treatment under 2 W resulted in bond strengths of 7.11 +/- 4.56 megapascals (MPa), which was not significantly different from that of acid etching (8.23 +/- 2.30 MPa). Laser irradiation at 1 W resulted in bond strengths of 5.64 +/- 3.19 MPa, which was significantly different from that of acid etching (P < .05). However, large SD and coefficient of variation values of both laser groups made reliability of this method as an enamel conditioner questionable. Scanning electron microscopy studies of the restored irradiated surfaces showed good surface characteristics, whereas the lased surface was still more irregular than the restored acid-etched sample. Although laser devices are effectively used in some other areas of dentistry, enamel conditioning with an Er,Cr:YSGG laser cannot be considered a successful alternative to the conventional methods of increasing bond strengths to enamel.Öğe Mandibular Symphyseal Distraction and Its Geometrical Evaluation: Report of a Case(E H ANGLE EDUCATION RESEARCH FOUNDATION, INC, 2003) Orhan, Metin; Malkoc, Sıddık; Üşümez, Serdar; Uçkan, SinaIn this report, the case of a patient who has been treated with a different use of a tooth-borne custom-made mandibular symphyseal distraction device is presented. The difference in the application is that the distal arm of the device was sectioned during the retention phase to allow the possible relapse of displaced condyles to their original positions while the labial segment expansion is being maintained. The effect of this procedure was also evaluated on a geometrical model using measurements from the patient's cast. We conclude that symphyseal distraction is an effective and fast method of correcting orthodontic anomalies. The effect of the procedure on the condyle was only 3degrees of distolateral. rotation as calculated using the geometrical model.Öğe Selcuk Type Headgear-Timer (STHT)(MOSBY-YEAR BOOK INC, 1997) Güray, Enis; Orhan, MetinThe Selcuk type headgear-timer (STHT) is described and tested under laboratory conditions first and then in a controlled patient study. The timing device was compared with real time measurements for 4 months. Accuracy was determined to be absolute (100%). The STHT was determined to be independent of force variables, easy to construct, rugged, and inexpensive. In the clinical test, 10 patients were instructed to wear the extraoral appliance for 16 hours a day. After a 2-month treatment period, the timing mechanisms were introduced to the patients and a subsequent 2-month treatment period was initiated. At the end of the second period, headgear wear was increased 26%. This significant improvement in patient compliance with the STHT timing device, attached to a standard breakaway type headgear, has the likelihood of enhancing treatment results. A foolproof method of assessing actual duration of wear is now available.
