Biomedical subjects

O Bala

Publications and source records attributed to O Bala.

6 recordsLinked to original sources

PubMed2005

Effect of LED and halogen light curing on polymerization of resin-based composites.

The clinical performance of light polymerized resin-based composites (RBCs) is greatly influenced by the quality of the light curing unit (LCU). A commonly used unit for polymerization of RBC material is the halogen LCUs. However, they have some drawbacks. Development of new blue superbright light emitting diodes (LED LCU) of 470 nm wavelengths with high light irradiance offers an alternative to standard halogen LCU. The aim of this study is compared the effectiveness of LED LCU and halogen LCU on the degree of conversion (DC) of different resin composites [two hybrid (Esthet-X, Filtek Z 250), four packable (Filtek P60, Prodigy Condensable, Surefil, Solitaire), one ormocer-based resin composite (Admira)]. The DC values of RBCs polymerized by LED LCU and halogen LCU ranged approximately from 61.1 +/- 0.4 to 50.6 +/- 0.6% and from 55.6 +/- 0.7 to 47.4 +/- 0.5%, respectively. Significantly higher DC of RBCs except Surefil and Filtek Z 250 was obtained for LED LCU compared with halogen LCU (P < 0.05). Surefil and Filtek Z 250 exhibited no statistically significant difference values between LED LCU and halogen LCU (P > 0.05). As a result, it was observed that the performance of LED LCU used in the study was satisfactory clinically and had sufficient irradiance to polymerize RBCs (hybrid, packable and ormocer based) at 2 mm depth with a curing time of 40 s.

Composite Resins↗

PubMed2004

Surface roughness of flowable and packable composite resin materials after finishing with abrasive discs.

The aim of this study was to compare surface roughness of flowable (Admira Flow, Filtek Flow, Tetric Flow) and packable (Admira, Filtek P60, Tetric HB) composite resin restorative materials finishing with Sof-Lex discs by means of average surface roughness (Ra) measurement using a surface profilometer and scanning electron microscopy (SEM). For each test group five specimens were prepared and roughness was measured in five different positions using a profilometer with a traversing distance of 4 mm and a cut-off value of 0.8 mm. The radius of the tracing diamond tip was 5 microm and measuring force and speed was 4 mN and 0.5 mm/s, respectively. The surface roughness of each individual disk was taken as the arithmetic mean of the Ra values measured in five different positions. Additionally, one specimen of each test group after finishing was observed under SEM with the magnification of x800 and x2500. Before finishing with Sof-Lex discs, flowable composite materials showed a smoother surface than packable composites restoratives (P < 0.05). However, after the finishing procedures similar surface textures were observed both from packable and flowable composites (P > 0.05).

Composite Resins↗

PubMed1997

Flouride release from various restorative materials.

Fluoride release from six light-activated restorative materials, including two resinmodified glass-ionomers, two composites, and two compomers, was evaluated and compared with one conventional acid-based glass-ionomer cement. The amount and rate of release varied among the tested materials. Both resin-modified glass-ionomers and the conventional acid-base glass-ionomer cements released more fluoride then the composites and compomers (p < 0.05). Additionally, composite materials released less fluoride than compomer materials (p < 0.05). Release of fluoride by the tested materials showed a significant decrease after all the tested time intervals.

Acrylic Resins↗

PubMed1995

Slime production by coagulase-negative staphylococci in the infected pulps.

In this study; slime factor which is produced by coagulase negative Staphylococci was investigated in infected pulps of 145 primary and permanent teeth. Staphylococci were isolated in 27% of the cultures and all of the isolated Staphylococci were coagulase negative (CNS) in permanent teeth whereas 75% of isolated Staphylococci were coagulase negative in primary teeth. Slime production rate was the same for both groups and 22% of CNS were found slime positive. It is thought that slime production is important not only in endodontic microbiology, but also in other fields of dentistry for the explanation of the pathogenesis of infection.

Bacterial Capsules↗

PubMedDate not supplied

[Mini invasive treatment of complications following laparoscopic cholecystectomy].

UNLABELLED: Miniinvasive treatment can be used in many early complications following laparoscopic cholecystectomy. In this article are analyzed the indications and the efficiency of these techniques. MATERIAL AND METHODS: We analyzed here a group of 9542 laparoscopic cholecystectomy operated in 9 years. The main postoperative complications were: bile leak (54 cases), haemorrhage (15 cases), subhepatic abscess (10 cases) and early diagnosed remnant lithiasis of CBD (11 cases). Miniinvasive techniques that were used were laparoscopic reinterventions (15 cases) and EST (22 cases). RESULTS: Classic reinterventions were practiced in 28.88% of cases with complications. Miniinvasive techniques were used in 42.2% of cases with complications: laparoscopic reinterventions (15 cases) for choleperitoneum, haemoperitoneum and subhepatic abscess and EST (22 cases) for prolonged bile leak on subhepatic drain and for early diagnosed remnant lithiasis of CBD. All cases were healed. DISCUSSION: Along with a precise diagnosis and a good indication, the miniinvasive treatment of complications proved to have good results, converting the bad operative outcome into a postoperative success.

Cholecystectomy, Laparoscopic↗

PubMedDate not supplied

Primary actinomycosis of the urinary bladder. Case report and review of the literature.

The case of a female patient, aged 37, with signs of partial intestinal obstruction, repeated cystitis and a tumoral mass in the hypogastrium is reported. Preoperative examinations could not establish the nature of the tumour. Colonoscopy as well as barium enema stopped at a sharp angulation of the sigmoid. Laparotomy evidenced an inflammatory tumour, with departure point in the urinary bladder, which involved the sigmoid and the uterus. After adhesiotomy a partial cystectomy was performed. The macroscopic aspect of the bladder was pseudopolypoid, while the microscopic one was typical for actinomycosis. The patient was discharged cured and was prescribed a penicillin course for 4 weeks.

Actinomycosis↗