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Öğe Comparison of two different gingivectomy techniques for gingival cleft treatment(E H ANGLE EDUCATION RESEARCH FOUNDATION, INC, 2004) Malkoc, S; Buyukyilmaz, T; Gelgor, I; Gursel, MInterdental clefts or invaginations contribute to orthodontic relapse and poor periodontal health in extraction cases. These clefts or invaginations can be removed both by electrosurgical or conventional surgical gingivectomy techniques. This study investigates and compares the efficacy of two different techniques to remove gingival clefts with respect to periodontal health and patient tolerance. Twenty-two patients (mean age, 15.7 years) with bilateral gingival clefts participated in this study. In each patient, the gingival invaginations were removed by gingivectomy using electrosurgery on one side and conventional surgery on the contralateral side. The length and depth of the invaginations, the gingival index of the adjacent teeth, and the changes in visual analogue scale scores were recorded before and after the operation for both groups. Mann-Whitney U-test and Wilcoxon tests were used to analyze the data statistically. The results showed significant improvement in invagination depth and length and gingival index scores for both techniques. There were no statistical differences between the two gingivectomy techniques with respect to gingival health and patient tolerance. Both techniques can be used to remove the gingival invaginations efficiently.Öğe Degree of conversion of two lingual retainer adhesives cured with different light sources(OXFORD UNIV PRESS, 2005) Usumez, S; Buyukyilmaz, T; Karaman, AI; Gunduz, BThe aim of this study was to evaluate the degree of conversion (DC) of two lingual retainer adhesives, Transbond Lingual Retainer (TLR) and Light Cure Retainer (LCR), cured with a fast halogen light, a plasma arc light and a light-emitting diode (LED) at various curing times. A conventional halogen light served as the control. One hundred adhesive samples (five per group) were cured for 5, 10 or 15 seconds with an Optilux 501 (fast halogen light), for 3, 6 or 9 seconds with a Power Pac (plasma arc light), or for 10, 20 or 40 seconds with an Elipar Freelight (LED). Samples cured for 40 seconds with the conventional halogen lamp were used as the controls. Absorbance peaks were recorded using Fourier transform infrared (FT-IR) spectroscopy. DC values were calculated. Data were analysed using Kruskal-Wallis and Mann-Whitney U-tests. For the TLR, the highest DC values were achieved in 6 and 9 seconds with the plasma arc light. Curing with the fast halogen light for 15 seconds and with the LED for 40 seconds produced statistically similar DC values, but these were lower than those with the plasma arc light. All of these light exposures yielded a statistically significantly higher DC than 40 seconds of conventional halogen light curing. The highest DC value for the LCR was achieved in 15 seconds with the fast halogen light, then the plasma arc light curing for 6 seconds. These two combinations produced a statistically significantly higher DC when compared with the 40 seconds of conventional halogen light curing. The lowest DC for the LCR was achieved with 10 seconds of LED curing. The overall DC of the LCR was significantly higher than that of the TLR. The results suggest that a similar or higher DC than the control values could be achieved in 6-9 seconds by plasma arc curing, in 10-15 seconds by fast halogen curing or in 20 seconds by LED curing.Öğe Effect of light-emitting diode on bond strength of orthodontic brackets(E H ANGLE EDUCATION RESEARCH FOUNDATION, INC, 2004) Usumez, S; Buyukyilmaz, T; Karaman, AIThe aim of this study was to evaluate the effect of light-emitting diode (LED) light curing on shear bond strength (SBS) of orthodontic brackets bonded to teeth. Light exposure of 40 seconds from a conventional halogen-based light-curing unit was used as a control. Eighty human premolars were divided into four groups of 20 each. Brackets were bonded to acid-etched teeth with Transbond XT light-cured adhesive. In the first group, the adhesive was light cured for 40 seconds with a conventional halogen unit (XL3000, 3M). In the other three groups, adhesive was cured with a commercial LED unit (Elipar FreeLight, 3M ESPE) for 10, 20, or 40 seconds. SBS of brackets was measured on a universal testing machine and recorded in megapascals. Adhesive remnant index (ARI) scores were determined after failure of brackets. Data were analyzed using analysis of variance and chi-square tests. No statistically significant differences were found among the SBS values of halogen-based light-cured (13.1 +/- 3.1 MPa) and 20- and 40-second LED-cured (13.9 +/- 4.8 MPa and 12.7 +/- 5.1 MPa) specimens (P > .05). However, 10 seconds of LED curing yielded significantly lower SBS (P < .05). No statistically significant differences were found between the ARI scores among groups. The results of this study are promising for the orthodontic application of LED-curing units, but further compatibility and physical characteristic studies of various orthodontic adhesives and clinical trials should be performed before validation.Öğe In vitro evaluation of shear bond strengths and in vivo analysis of bond survival of indirect-bonding resins(E H ANGLE EDUCATION RESEARCH FOUNDATION, INC, 2004) Polat, O; Karaman, AI; Buyukyilmaz, TIn this study we evaluate the shear bond strengths (SBS) of indirect-bonding systems available on the market. For the in vitro study, 60 extracted premolars were divided into three groups. In indirect group I, the brackets were bonded to models using Therma Cure laboratory resin and transferred to the teeth using Custom IQ resin for indirect bonding. For indirect group II, the teeth were attached to models using Transbond XT and transferred using Sondhi Rapid Set. In the direct-bonding group, the brackets were bonded to teeth directly using Transbond XT. The SBS were evaluated, and the comparisons were made. In the in vivo study, left half of the upper arch and right half of the lower arch were bonded using Sondhi's indirect-bonding resin and right half of the upper arch and left half of the lower arch were bonded using Therma Cure as a laboratory resin and Custom IQ as a clinical bonding resin. The failure rates of the brackets were followed for nine months. Analysis of variance and Tukey tests were performed. Mean SBS values (MPa) were 10.3 +/- 4.2, 6.1 +/- 1.6, and 12.8 +/- 5.4 for the indirect groups I and II and for the direct-bonding group, respectively. There were no significant differences between indirect group I and direct group (P > .05), whereas both yielded significantly higher SBS values compared with indirect group II. In vivo bond survival evaluation showed no differences between the two indirect-bonding systems available.Öğe Intraosseous screw-supported upper molar distalization(E H ANGLE EDUCATION RESEARCH FOUNDATION, INC, 2004) Gelgor, IE; Buyukyilmaz, T; Karaman, AIY; Dolanmaz, D; Kalayci, AThe aims of the present study were to investigate (1) the efficiency of intraosseous screws for anchorage in maxillary molar distalization and (2) the sagittal and vertical skeletal, dental, and soft tissue changes after maxillary molar distalization using intraosseous screw-supported anchorage. Twenty-five subjects (18 girls and seven boys; 11.3 to 16.5 years of age) with skeletal Class 1, dental Class 11 malocclusion participated in the study. An anchorage unit was prepared for molar distalization by placing an intraosseous screw behind the incisive canal at a safe distance from the midpalatal suture following the palatal anatomy. The screws were placed and immediately loaded to distalize upper first molars or the second molars when they were present. The average distalization time to achieve an overcorrected Class I molar relationship was 4.6 months. The skeletal and dental changes were measured on cephalograms and dental casts obtained before and after the distalization. In the cephalograms, the upper first molars were tipped 8.8degrees and moved 3.9 mm distally on average. On the dental casts, the mean distalization was five mm. The upper molars were rotated distopalatally. Mild protrusion (mean 0.5 mm) of the upper central incisors was also recorded. However, there was no change in overjet, overbite, or mandibular plane angle measurements. In conclusion, immediately loaded intraosseous screw-supported anchorage unit was successful in achieving sufficient molar distalization without major anchorage loss.
