Biomedical subjects

Törün Ozer

Publications and source records attributed to Törün Ozer.

5 recordsLinked to original sources

PubMed2007

Etching enamel for orthodontics with an erbium, chromium:yttrium-scandium-gallium-garnet laser system.

OBJECTIVE: To test the shear bond strength, surface characteristics, and fracture mode of brackets that are bonded to enamel etched with an erbium, chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser operated at different power outputs: 0.5 W, 1 W, and 2 W. MATERIALS AND METHODS: Human premolars that had been extracted for orthodontic purposes were used. Enamel was etched with an Er,Cr:YSGG laser system operated at one of three power outputs or with orthophosphoric acid. RESULTS: The shear bond strength associated with the 0.5-W laser irradiation was significantly less than the strengths obtained with the other irradiations. Both the 1-W and 2-W laser irradiations were capable of etching enamel in the same manner. This finding was confirmed by scanning electron microscopy examination. The evaluation of adhesive-remnant-index scores demonstrated no statistically significant difference in bond failure site among the groups, except for the 0.5-W laser-etched group. Generally, more adhesive was left on the enamel surface with laser irradiation than with acid etching. CONCLUSION: The mean shear bond strength and enamel surface etching obtained with an Er,Cr: YSGG laser (operated at 1 W or 2 W for 15 seconds) is comparable to that obtained with acid etching.

Analysis of Variance↗

PubMed2006

Orthodontic and orthopaedic changes associated with treatment in subjects with Class III malocclusions.

The aim of this study was to determine the cephalometric changes in subjects with Class III malocclusions after rapid palatal expansion (RPE) and facemask treatment. The 30 subjects presented with developing Class III malocclusions. The treatment group comprised 15 patients (eight girls and seven boys, mean age 11 years 6 months) who had undergone RPE and facemask therapy. The control group consisted of nine girls and six boys with a mean age of 11 years 8 months. Radiographs were take at the same time intervals for both groups, and the average treatment time was 15 months. A Wilcoxon test was used to determine significant differences before and after treatment, and a Mann-Whitney U-test to analyse differences between the treatment and control groups. In the sagittal plane, significant changes were observed in both groups. In the treatment group, the following dimensions increased significantly: A perpendicular to FHp (P < 0.001), ANS-PNS (P < 0.01), 6 perpendicular to FHp (P < 0.05); in the control group Go-Gn (P < 0.05) increased significantly. In the treatment group, SN/Go-Gn and SN/ANS-PNS had higher values and this finding was significant (P < 0.05). Managing developing Class III malocclusions with RPE and maxillary protraction presents favourable results, such as vertical and sagittal displacement of point A.

Case-Control Studies↗

PubMed2006

Interleukins 2, 6, and 8 levels in human gingival sulcus during orthodontic treatment.

INTRODUCTION: The aims of this study were to determine levels of interleukins 2, 6, and 8 during tooth movement, and test whether they differ from each other with leveling and distalization forces used in various treatment stages of standard orthodontic therapy. METHODS: Fifteen patients (9 female, 6 male; ages, 15-19 years; mean age, 16.7 +/- 2.3 years) participated in this study. Each underwent a session of professional oral hygiene and received oral hygiene instructions. Two months later, a fixed orthodontic appliance was placed. The patients were seen at baseline, at days 7 and 21, and as the teeth were leveled. Records of the baseline scores for the distalization forces were taken at the sixth month. Scores of days 7 and 21 after 6 months of the distalization treatment were also recorded. RESULTS: Increases were seen in the volume of gingival crevicular fluid and the concentrations of interleukins 2, 6, and 8. CONCLUSIONS: Leveling and distalization of the teeth evoke increases in interleukins 2, 6, and 8 levels in the periodontal tissues that can be detected in gingival crevicular fluid.

Adolescent↗

PubMed2006

A practical method for determining pubertal growth spurt.

INTRODUCTION: It is important to evaluate skeletal maturation in orthodontic treatment. Hand-wrist and cervical maturation stages have been shown to be correlated with skeletal growth changes during puberty. The cervical vertebrae have 6 maturation phases, whereas the medial phalange of the third finger has 5 stages; a modified version has 6 stages. The purpose of this study was to determine the correlation of the cervical vertebrae maturation index with the modified medial phalange index. METHODS: Lateral cephalometric and left-hand medial phalange radiographs of 150 males between the ages of 9 and 19 who were referred for orthodontic treatment were examined. RESULTS: The 6 modified medial phalange stages were found to correlate with the 6 cervical vertebral maturation stages. CONCLUSIONS: Because cervical vertebrae stage is a reliable maturation indicator, the medial phalange of the third finger can be used instead to assess a subject's skeletal maturation.

Adolescent↗

PubMed2006

Interleukine-1beta and tumor necrosis factor-alpha levels in the human gingival sulcus during orthodontic treatment.

OBJECTIVE: To test whether interleukine 1beta (IL-1beta) and tumor necrosis factor-alpha (TNF-alpha) levels differ from each other in different treatment levels. MATERIALS AND METHODS: Eighteen patients, nine female and nine male (aged 16-19 years; mean 17.4 +/- 1.8 years), participated in this study. Each subject underwent a session on professional oral hygiene and received oral hygiene instructions. Two months later, a fixed orthodontic appliance was placed. The patients were seen at baseline, at days 7 and 21 and at the 3rd and 6th month as the leveling of the teeth occurred. Records of the baseline scores for the distalization forces were taken at the 6th month. Days 7 and 21 after 6 months of treatment were also recorded. RESULTS: There were increases in the volume of gingival crevicular fluid (GCF) and in the concentrations of IL-1beta and TNF-alpha. CONCLUSIONS: Leveling and distalization of the teeth evoke increases in both the IL-1 and TNF-alpha levels that can be detected in GCF.

Adolescent↗