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Biomedical subjects

B Pişkin

Publications and source records attributed to B Pişkin.

9 recordsLinked to original sources
PubMed1996

The effect of tubular penetration of root canal sealers on dye microleakage.

An in vitro study of a possible correlation between penetration of dentinal tubules by four root canal sealers and microleakage of external fluids into the canal was done using a dye leakage method and scanning electron microscopy. The root canals of 45 teeth were instrumented and the smear layer removed prior to obturation of root canals with gutta-percha and one of four sealers: Diaket, Endomethasone, CRCS or Ketac-Endo. The extent of leakage was scored after immersion in India ink for 72 h. The same specimens were also used for scanning electron microscopic evaluation. There was a statistical difference in leakage patterns between the groups (P < 0.05). Diaket had lower microleakage scores than the other sealers (P < 0.05). When the scores for penetration of sealers into the tubules were analysed, Ketac-Endo demonstrated the least penetration (P < 0.01). There appeared to be a converse relation between tubular penetration and dye leakage, but the correlation was not statistically significant (P > 0.05).

Administration, Topical↗
PubMed1995

Stability of various sodium hypochlorite solutions.

Although the manufacturers use at least a 2-yr expiration date for sealed undiluted NaOCl solutions, chemical stability of NaOCl may be adversely affected by many factors. The purpose of this study was to investigate the effects of storage temperature, concentration, and time on the stability on three different brands of commercial household bleaching agents as a source of NaOCl, and to compare the stability of these brands. All solutions showed degradation versus time; however, this degradation occurred very slowly except for the group of solutions containing 5% available chlorine stored at 24 degrees C. Solutions containing 0.5% available chlorine stored at 4 degrees C and 24 degrees C and 5% solutions stored at 4 degrees C showed satisfactory stability at 200 days. No significant difference was found among three brands in respect to their chemical stability.

Analysis of Variance↗
PubMed1993

Neural changes in ulcerative and hyperplastic pulpitis: a transmission electron microscopic study.

The purpose of this study was to examine at ultrastructural level the neural changes in human apical pulps of teeth clinically diagnosed as having ulcerative or hyperplastic pulpitis. Seventeen specimens were prepared from six teeth with ulcerative or hyperplastic pulpitis and four specimens from two sound teeth. After routine procedures the specimens were examined under an electron microscope for changes in the structure of myelinated and unmyelinated nerve fibres. Although the teeth used in this study responded positively to vitality test, the results revealed that moderate to severe degenerative changes occurred in the nerve fibres of the apical pulps of the teeth showing these two diseases.

Dental Pulp↗
PubMed1993

Internal resorption occurring after accidental extrusion of iodoform paste into the mandibular canal.

The precise etiology of internal resorption is unknown but it is generally believed that triggering factors are infection and persistent chronic pulpitis. A case is presented with internal resorption, which developed subsequent to extrusion of iodoform paste from the adjacent tooth into the mandibular canal. According to clinical and radiographic examinations made after 7 years, the tooth was clinically asymptomatic, vital and the internal resorption was arrested without treatment.

Adult↗
PubMed1990

Effect of testicular torsion on the contralateral testis.

It has been previously shown that unilateral testicular torsion can cause disruptive anatomic changes in the contralateral testis in rats. In this experimental study plasma and urine prostaglandin E2 levels were studied correlatively with testicular histopathology in acute testicular torsion cases. As a result of this study, necrobiotic morphologic alterations causing testis necrosis and significant increase in plasma prostaglandin E2 levels were observed. Contralateral testicular histology was analyzed in all dogs. None of them showed abnormal tubular architecture.

Animals↗
PubMed1990

Aneurysmatic dilatation of popliteal and femoral artery due to long-standing traumatic arteriovenous fistula.

A 65-year-old woman presented with an extensive femoropopliteal aneurysm discovered after a long-standing (24 years) post-traumatic arteriovenous fistula (AVF). Her complaints began after trauma. All arterial dilatations discovered during the course of an AVF must be treated because of the risk of rupture. With the advent of arterial reconstructive procedures, the surgical approach to popliteal aneurysm became and remains excision and graft interposition or by-pass graft with concomitant aneurysm ligation. Of all available graft material the autogenous saphenous vein remains the best material for arterial reconstruction. The diagnostic technics, therapeutic procedures and possible complications are discussed with literature review. The etiology of aneurysm that develop proximal to AVF is reviewed.

Aged↗
PubMed1989

The penetration of smear material into dentinal tubules during instrumentation with surface-active reagents: a scanning electron microscopic study.

Thirty freshly extracted, single-rooted anterior teeth were used. They were divided into three groups and instrumented conventionally with #10 to 50 K files. During instrumentation, the K files in the first group were moistened with saline solution, in the second group with 50% sodium dodecylbenzenesulfonate solution, and in the third group with Sulfapon (sodium salt of sulfonated condensation product of ethylen oxide with a fatty acid) solution. After the experimental procedure the specimens were examined in a scanning electron microscope to observe packing of smear material into dentinal tubules. Results showed the surface-active reagents cause the deeper penetration of the smear material into the dentinal tubules. These findings support the hypothesis that the phenomenon of the packing of smear material into the dentinal tubules is by capillary action and fluid dynamics.

Benzenesulfonates↗
PubMedDate not supplied

Hemobilia from a ruptured hepatic artery aneurysm in a 16-year-old girl.

A 16-year-old girl with hepatic artery aneurysm due to fibromuscular dysplasia which caused hemobilia is presented. This most unusual and life-threatening type of gastrointestinal bleeding was successfully treated by ligation of the common hepatic and gastroduodenal arteries. The clinical aspects and operative procedures of hepatic artery aneurysm are discussed.

Adolescent↗