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  1. Article: Sealing Ability of Bioactive Root-End Filling Materials in Retro Cavities Prepared with Er,Cr:YSGG Laser and Ultrasonic Techniques.

    Bago, Ivona / Lucić, Ružica / Budimir, Ana / Rajić, Valentina / Balić, Merima / Anić, Ivica

    Bioengineering (Basel, Switzerland)

    2022  Volume 9, Issue 7

    Abstract: The aim of this in vitro study was to compare the apical sealing ability of total fill bioceramic root repair material (BC-RRM) and mineral trioxide aggregate (MTA), regarding the retrograde preparation technique used: ultrasonic or erbium, chromium: ... ...

    Abstract The aim of this in vitro study was to compare the apical sealing ability of total fill bioceramic root repair material (BC-RRM) and mineral trioxide aggregate (MTA), regarding the retrograde preparation technique used: ultrasonic or erbium, chromium: yttrium, scandium, gallium, or garnet (Er,Cr:YSGG) laser. The study sample consisted of 48 human single-rooted teeth. After root-end resection, the samples were divided into two groups, according to the retrograde preparation technique used: Group 1: ultrasonic; Group 2: Er,Cr:YSGG laser. In each group, half of the retrograde cavities were filled with BC-RRM, and the other half were filled with MTA. The specimens were mounted in tubes and sterilized in plasma. The root canals were inoculated with Enterococcus faecalis, and the tubes were filled with fetal bovine serum, leaving the apical part of the root in the serum. After 30 days, the canals were sampled and cultured, and the colony forming units (CFUs) were counted with the additional polymerase chain reaction (PCR analysis). There was no significant difference between ultrasonic groups and the Er,Cr:YSGG-MTA group, regarding the number of CFUs (p > 0.05). The Er,Cr:YSGG-BC-RRM group showed the highest number of remaining viable bacteria (p < 0.001). Both filling materials filled in ultrasonic preparations presented similar sealing abilities. The BC-RRM showed more leakage when used in retro cavities prepared with the Er,Cr:YSGG laser.
    Language English
    Publishing date 2022-07-14
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2746191-9
    ISSN 2306-5354
    ISSN 2306-5354
    DOI 10.3390/bioengineering9070314
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Effect of Feed Speed and Wood Species on Roughness of Machined Surface

    Čavlović Ankica / Obućina Murčo / Škaljić Nedim / Beljo Lučić Ružica

    Drvna Industrija, Vol 60, Iss 4, Pp 229-

    2009  Volume 234

    Abstract: In this study, the surface roughness values of planed beech-wood (Fagus L.), oak-wood (Quercus L.) and fir-wood (Abies alba Mill.) specimens were examined. The samples of beech-wood were cut from steamed beech-wood and from thermally modified beech-wood ( ...

    Abstract In this study, the surface roughness values of planed beech-wood (Fagus L.), oak-wood (Quercus L.) and fir-wood (Abies alba Mill.) specimens were examined. The samples of beech-wood were cut from steamed beech-wood and from thermally modified beech-wood (212oC). The specimens were machined by planing in radial directions with two knives at 6, 12, 18 and 24 m/min feed speed. The cutting depth of 2.0 mm was constant and knife rake angle was 15o. The machining experiments were carried out using a single cutter-block of a Weinig Powermat 400. The cutter-block with a diameter of Ø 125 mm rotated at 6000 revolutions per minute (RPM). Surface roughness was measured from the radial face of each sample according to DIN 4768 (1990) by using Mitutoyo SJ-201 stylus scanner. Comparison between the results of surface roughness of four species showed that surface roughness increases with the increase of feed rate. The surface quality of samples of planed beech-wood, oak-wood and fir-wood were significantly different. The samples of planed surface of oak-wood had the best quality and the samples of fir wood had the highest values of surface roughness. There were no significant differences in the surface quality of thermally modified and steamed beach-wood samples despite the significant difference in mechanical and physical properties of thermally modified and steamed wood.
    Keywords surface roughness ; wood planing ; feed speed ; wood species ; Forestry ; SD1-669.5 ; Agriculture ; S ; DOAJ:Forestry ; DOAJ:Agriculture and Food Sciences
    Subject code 550
    Language Croatian
    Publishing date 2009-12-01T00:00:00Z
    Publisher University of Zagreb
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Side-by-side determination of workers' exposure to wood dust with IOM and open-faced samplers.

    Cavlović, Anka Ozana / Beljo Lučić, Ružica / Jug, Matija / Radmanović, Kristijan / Bešlić, Ivan

    Arhiv za higijenu rada i toksikologiju

    2013  Volume 64, Issue 3, Page(s) 379–384

    Abstract: Woodworkers' exposure to airborne particles is measured with different sampling techniques throughout the world. Due to a great number of exposure data obtained with different samplers, European countries have aimed over the last ten years to find a ... ...

    Abstract Woodworkers' exposure to airborne particles is measured with different sampling techniques throughout the world. Due to a great number of exposure data obtained with different samplers, European countries have aimed over the last ten years to find a conversion factor for mass concentrations that would render these measurements comparable. Following the accepted EU standards and regulations, we replaced a 25 mm open-faced (OF) filter holder with an IOM head to determine woodworkers' exposure to inhalable dust and establish an IOM/OF sampler ratio that might serve as a reliable factor for converting the existing OF data to IOM dust mass concentration in the industrial environment. For this side-by-side sampling we used personal 25 mm OF (N=29) and IOM (N=29) sampling heads over eight working hours. The obtained IOM/OF ratios ranged between 0.7 and 2.3. However, mass concentrations obtained by IOM and OF samplers did not significantly differ. Our findings suggest that there is no need for conversion of the existing OF data for workers exposed to wood dust, provided that dust mass concentrations in the working environment range between 1 mg m-3 and 7 mg m-3. Future side-by-side measurements should also involve environments with low wood dust mass concentrations.
    MeSH term(s) Air Pollutants, Occupational/analysis ; Dust/analysis ; Environmental Monitoring/instrumentation ; Environmental Monitoring/methods ; Equipment Design ; Statistics, Nonparametric ; Wood/analysis
    Chemical Substances Air Pollutants, Occupational ; Dust
    Language English
    Publishing date 2013-09
    Publishing country Croatia
    Document type Evaluation Studies ; Journal Article
    ZDB-ID 127289-5
    ISSN 1848-6312 ; 0004-1254
    ISSN (online) 1848-6312
    ISSN 0004-1254
    DOI 10.2478/10004-1254-64-2013-2316
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  4. Article: The theory and mathematical model underlying the radial sawing simulator--RadSawSim

    Istvanic, Josip / Lucic, Ruzica Beljo / Piljak, Krunoslav / Jambrekovic, Vladimir / Antonovic, Alan / Pervan, Stjepan

    Forest products journal. 2010, v. 60, no. 1

    2010  

    Keywords lumber ; sawing ; guidelines ; wood quality ; grain and figure ; wood properties ; texture ; mathematical models ; equations ; computer software ; Croatia
    Language English
    Size p. 48-56.
    Document type Article
    ZDB-ID 240509-x
    ISSN 0015-7473
    ISSN 0015-7473
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 3029: Show issues

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  5. Article ; Audio / Video: Analysis of Factors Affecting Log Band Saw Capacity

    Ištvanić, Josip / Lučić, Ružica Beljo / Jug, Matija / Karan, Rajka

    Croatian journal of forest engineering. 2009 June, v. 30, Issue 1

    2009  

    Keywords bandsaws ; productivity ; sawmills ; sawing ; logs ; equipment operators
    Language English
    Dates of publication 2009-06
    Size p. 27-35.
    Document type Article ; Audio / Video
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Some possibilities for reducing circular saw idling noise

    Beljo-Lučić, Ružica / Vlado Goglia

    Journal of wood science. 2001 Oct., v. 47, no. 5

    2001  

    Abstract: The sound pressure level of differently designed circular saw blades were investigated during idling. Nine blade samples were used: three differently designed blade bodies (without slots, with four radial slots, and with four slots with copper cork), ... ...

    Abstract The sound pressure level of differently designed circular saw blades were investigated during idling. Nine blade samples were used: three differently designed blade bodies (without slots, with four radial slots, and with four slots with copper cork), each with three diameters (260,280, and 300 mm). The sound pressure level was measured at different rotational frequencies ranging from 25 to 65 rps in increments of 1 rps. Rubber damping rings 80mm in diameter and 0.3 mm thick were placed between the saw blade and the collars, and the emitted noise was measured. Because of the whistling sound the blades without slots emitted high sound pressure levels. There were no significant changes when rubber damping rings were used. The use of rubber damping rings on the samples with radial slots eliminates the whistling noise. The saws with copper corks did not emit a whistling noise at all, and their aerodynamic noise was 2–3 dB (A) lower than the aerodynamic noise of the saws with radial slots. The relation between sound pressure emitted by the damped idling saw and peripheral velocity can be described by the power function with the exponent value between 4.8 and 5.2.
    Keywords circular saws ; collars ; cork ; rubber
    Language English
    Dates of publication 2001-10
    Size p. 389-393.
    Publishing place Springer Japan
    Document type Article
    ZDB-ID 1429032-7
    ISSN 1435-0211
    ISSN 1435-0211
    DOI 10.1007/BF00766791
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 6929: Show issues

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  7. Article ; Online: Endotoxin exposure assessment in wood-processing industry: airborne versus settled dust levels.

    Pipinić, Ivana Sabolić / Varnai, Veda Marija / Lucić, Ruzica Beljo / Cavlović, Ankica / Prester, Ljerka / Orct, Tatjana / Macan, Jelena

    Arhiv za higijenu rada i toksikologiju

    2010  Volume 61, Issue 2, Page(s) 161–166

    Abstract: Wood processing is usually performed in environments with large amounts of endotoxin-rich bioaerosols that are associated with a variety of health effects. The aim of this preliminary study was to assess the relation between endotoxin levels in settled ... ...

    Abstract Wood processing is usually performed in environments with large amounts of endotoxin-rich bioaerosols that are associated with a variety of health effects. The aim of this preliminary study was to assess the relation between endotoxin levels in settled and airborne dust in wood-processing industry. Ten pairs of airborne and settled dust samples were collected in a sawmill and parquet manufacture of two wood-processing plants in Croatia. Endotoxin was assayed with a chromogenic end-point LAL (Limulus amebocyte lysate) method. The results showed that endotoxin levels in airborne respirable dust were above the proposed occupational exposure limit of 125 EU m(-3) and could be considered hazardous for the respiratory system. In settled dust they ranged between 229.7 EU mg(-1) and 604.3 EU mg(-1) and in airborne dust between 166.8 EU mg(-1) and 671.6 EU m(-3), but there was no significant correlation between them (Spearman's rho=0.358, P=0.310). This study points to sawmill settled dust as endotoxin reservoir and suggests that it may add to already high exposure to airborne endotoxins associated with wood processing. Investigations of the relation between settled and airborne endotoxin levels should be continued to better understand the sources and sites of endotoxin contamination in wood-processing industry.
    MeSH term(s) Air Pollutants, Occupational/analysis ; Croatia ; Dust/analysis ; Endotoxins/analysis ; Humans ; Industry ; Occupational Exposure ; Wood/analysis
    Chemical Substances Air Pollutants, Occupational ; Dust ; Endotoxins
    Language English
    Publishing date 2010-06
    Publishing country Croatia
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 127289-5
    ISSN 1848-6312 ; 0004-1254
    ISSN (online) 1848-6312
    ISSN 0004-1254
    DOI 10.2478/10004-1254-61-2010-1996
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    In stock of ZB MED Cologne/Königswinter

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  8. Article: Wood dust exposure in wood industry and forestry.

    Puntarić, Dinko / Kos, Ankica / Smit, Zdenko / Zecić, Zeljko / Sega, Kresimir / Beljo-Lucić, Ruzica / Horvat, Dubravko / Bosnir, Jasna

    Collegium antropologicum

    2005  Volume 29, Issue 1, Page(s) 207–211

    Abstract: The aim of the study was to determine occupational exposure in Croatian wood processing industry and forest workers to harmful effects of wood dust on the risk of nose, nasal cavity and lung carcinoma. Mass concentrations of respirable particles and ... ...

    Abstract The aim of the study was to determine occupational exposure in Croatian wood processing industry and forest workers to harmful effects of wood dust on the risk of nose, nasal cavity and lung carcinoma. Mass concentrations of respirable particles and total wood dust were measured at two wood processing plants, three woodwork shops, and one lumbering site, where 225 total wood dust samples and 221 respirable particle samples were collected. Wood dust mass concentration was determined by the gravimetric method. Mass concentrations exceeding total wood dust maximal allowed concentration (MAC, 3 mg/m3) were measured for beechwood and oakwood dust in 38% (79/206) of study samples from wood processing facilities (plants and woodwork shops). Mass concentrations of respirable particles exceeding MAC (1 mg/m3) were recorded in 24% (48/202) of samples from wood processing facilities (mean 2.38 +/- 2.08 mg/m3 in plants and 3.6 +/- 2.22 mg/m3 in woodwork shops). Thus, 13% (27/206) of work sites in wood processing facilities failed to meet health criteria according to European guidelines. Launching of measures to reduce wood dust emission to the work area is recommended.
    MeSH term(s) Croatia ; Dust ; Forestry ; Humans ; Industry ; Lung Neoplasms/etiology ; Nose Neoplasms/etiology ; Occupational Exposure ; Risk Factors ; Wood
    Chemical Substances Dust
    Language English
    Publishing date 2005-06
    Publishing country Croatia
    Document type Journal Article
    ZDB-ID 233430-6
    ISSN 0350-6134 ; 0353-3735
    ISSN 0350-6134 ; 0353-3735
    Database MEDical Literature Analysis and Retrieval System OnLINE

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