Biomedical subjects

N Kucukkeles

Publications and source records attributed to N Kucukkeles.

4 recordsLinked to original sources

PubMed2005

Compatibility of mechanical and computerized axiographs: a pilot study.

STATEMENT OF PROBLEM: There is little known information comparing axiographic data obtained with a mechanical device and data obtained with a computerized device. However, long-term follow-up of patients may necessitate comparison of previously made mechanical axiographic data with records obtained through computer-aided axiography. PURPOSE: The purpose of this study was to compare measurements between mechanical and computerized axiographs in recording the rotational and translation movements of the mandible. MATERIAL AND METHODS: The study enrolled 31 subjects with no detectable clinical signs of temporomandibular disorders. A single operator obtained 3 separate axiographic tracings of right and left condylar paths for each subject, using repeated opening, closing, protrusive, and retrusive movements. Data were collected for both the mechanical (SAM Axiograph Axo 200), and the computerized axiographs (SAM Axiotron and Axo 500). Angular (degrees) and linear measurements (mm) for the mechanical axiograph were made from the tracings obtained on grid paper using a compass, ruler, and protractor. The computer performed the measurements for the computerized axiograph tracings. All parameters were compared statistically with a Wilcoxon signed rank test (alpha = .05). The same operator remeasured all mechanical axiographic tracings for 20 subjects 1 week later to evaluate measurement error. Chronbach's alpha was used as a measure of consistency between the 2 measurements. RESULTS: Mean opening and closing angles varied between 52.4 and 54.2 degrees, and mean protrusive, and retrusive angles varied between 50.1 and 54.9 degrees. Mean opening and closing distances varied between 11.4 and 12.3 mm, and mean protrusive and retrusive distances varied between 8.2 and 8.7 mm. Comparison with the Wilcoxon signed rank test showed no significant differences for any parameter tested. There were high and medium inter-item correlations between repeated measurements of the manual device when Chronbach's alpha was applied, but these results were not sufficient to prove consistency between 2 consecutive measurements. CONCLUSION: The results showed nonsignificant differences between the recordings of the mechanical and computerized axiographs tested. The authors hypothesize that minor differences may be attributed to hand-measuring errors for the tracings generated by the mechanical axiograph. This study is limited due to the impact of poor precision of the manual device on the study results when these recordings are compared to another instrument. Therefore, it is not possible to conclude that data from the manual and the computerized axiographs are compatible with each other.

Adolescent↗

PubMed2003

Condylar pathway changes following different treatment modalities.

The purpose of this investigation was to evaluate the effect of extraction and non-extraction approaches on the condylar pathways in subjects treated with fixed orthodontic appliances. The study was carried out on 70 patients (47 female, 23 male) who had undergone orthodontic treatment with fixed appliances. The mean age for the total group was 16.3 years (16.5 years for the females and 16 years for the males). Forty-seven patients were treated non-extraction and 23 with extractions. None of the patients had any temporomandibular joint (TMJ) problems before orthodontic treatment and all were treated with standard edgewise mechanics. The condylar pathway recordings were taken before and after treatment with an axiograph. The maximum opening capacity was measured and the right and left condylar pathways of each patient were recorded in protrusion and during opening movements. During treatment the left opening angle (LOA) only decreased significantly in the upper premolar extraction group. The left opening distance (LOD) decreased in all groups during treatment but was only statistically significant in the non-extraction and upper and lower extraction groups. In the small overjet group (OJ < or = 4 mm), the LOA, right opening distance (ROD) and LOD decreased significantly while there was no significant change in axiographic parameters in the large overjet group (OJ > 4 mm). In the latter group, overjet and overbite decreased while mouth opening (3 mm P < 0.05) significantly increased. These results indicate that there is no difference between the effect of different treatment protocols on the condylar pathways.

Adolescent↗

PubMed1999

Fluoride release capacities of four different orthodontic adhesives.

The aim of this study was to evaluate the fluoride release capacities of four orthodontic light cured adhesives. Groups 1 and 2 were the composites, Transbond and Sequence; Groups 3 and 4 were the glass ionomer cements, Fuji Ortho LC and 3M. Ten disc shaped specimens were prepared from each adhesive, and placed into a 1 ml of distilled water at 37 degrees C. The measurements were taken every day for a week, then once a week till the end of the first month, and once in two weeks till the end of the third month. The total and daily released fluoride amount during the testing period was statistically analyzed. The difference between the composite and glass ionomer cements was obvious. All the groups were statistically different from each other (p < 0.001). When the daily fluoride release graphics were detected, a sudden decrease was seen for all the adhesives. The fluoride values of the composites decreased to almost zero after the second day. The glass ionomer cements showed a decrease, too, but, they remained at a high level.

Acrylic Resins↗

PubMed1999

Comparisons between cervical vertebrae and hand-wrist maturation for the assessment of skeletal maturity.

It was claimed that, skeletal maturity could be determined by using anatomical changes of the cervical vertebrae observed on the lateral cephalometric radiographs. In this method of assessment cervical vertebrae C2, C3, and C4 are observed and each patient is placed in a cervical vertebrae maturation index (CVMI). Fishman developed a system of hand-wrist skeletal maturation indicators (SMI), using four stages of bone maturation at six anatomic sites. The purpose of this study was to analyze associations between cervical vertebrae maturation index (CVMI) and skeletal maturation index (SMI). The second objective was to determine the reproducibility of the identifications on the lateral cephalograms and hand-wrist films. Lateral cephalometric and left hand-wrist radiographs of 180 untreated subjects (99 girls and 81 boys) aged from 8 to 18 years were obtained from the files of the Marmara University School of Dentistry, Department of Orthodontics. The results of this study indicated that cervical vertebrae maturation and hand-wrist skeletal maturation were significantly related.

Adolescent↗