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  1. Article ; Online: Evaluation of polyamide (NYLON) versus polymethyl methacrylate (PMMA) denture base materials regarding water solubility

    Marwa Hassan Mostafa / Ali Abdulghani AlSourori

    Bulletin of the National Research Centre, Vol 47, Iss 1, Pp 1-

    in vitro research

    2023  Volume 5

    Abstract: Abstract Background Several denture base materials have evolved over the years. Beginning with metal and ending up with various types of acrylic materials in order to have a biocompatible, antimicrobial denture base. A flexible acrylic resin, such as ... ...

    Abstract Abstract Background Several denture base materials have evolved over the years. Beginning with metal and ending up with various types of acrylic materials in order to have a biocompatible, antimicrobial denture base. A flexible acrylic resin, such as Polyamides, has been introduced to address the drawbacks of heat-cured PMMA resin. This study was conducted to examine the water solubility and water sorption of flexible thermoplastic polyamides (Valplast) and two types of conventional heat-cured acrylic resin (PMMA) (Acrostone, Vertex). Methods Specimens of thermoplastic polyamides and two types of conventional PMMA (Acrostone, Vertex) resin were manufactured and used in the current investigation in accordance with manufacturer instructions. A total of 45 specimens were milled into discs with a diameter of 50.0 mm diameter, 5.0 mm thick. To ascertain conformity with ADA Standard No. 12, water solubility and water sorption were measured. Results All items complied with ADA regulations for water solubility and sorption. Flexible thermoplastic polyamide displayed less water solubility, and water sorption than heat-cured PMMA. Acrostone showed the higher water solubility, sorption followed by Vertex heat cure acrylic resin both heat cured showed significant higher water solubility than polyamides Valplast). Conclusions Within the limitations of this in vitro experiment, heat cure PMMA resin demonstrated significantly greater water solubility and water sorption when compared to thermoplastic polyamides.
    Keywords Denture base resins ; Flexible polyamides ; Heat cure ; Water solubility ; Water sorption ; Science ; Q
    Subject code 621
    Language English
    Publishing date 2023-05-01T00:00:00Z
    Publisher SpringerOpen
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Microbial evaluation of heat cured silicone versus heat cured acrylic resin in maxillary obturator

    Mohamed Amr Elkhashab / Marwa Hassan Mostafa / Ali Abdulghani AlSourori

    Bulletin of the National Research Centre, Vol 46, Iss 1, Pp 1-

    2022  Volume 9

    Abstract: Abstract Purpose The aim of this trial was to compare the microbial colonization of heat-cured silicone and heat-cured acrylic resin in obturators restoring acquired maxillary defects. Material and methods The experiment was carried out on six partially ... ...

    Abstract Abstract Purpose The aim of this trial was to compare the microbial colonization of heat-cured silicone and heat-cured acrylic resin in obturators restoring acquired maxillary defects. Material and methods The experiment was carried out on six partially edentulous patients having unilateral total maxillectomy defects approaching midline (class I Aramany classification) who are in need of definitive obturator. Selected patients received metal framework prosthesis with heat-cured acrylic resin bulb extending into the surgical site. At the time of delivery, a swab was obtained from the patients who represent the baseline for the group I. Patients were recalled after two and four weeks from wearing the obturator for microbiological evaluation and a swab was taken each time from the same place. In group II, the heat-cured acrylic resin was replaced with heat-cured silicone and a swab was obtained on the day of insertion as a baseline for group II. Patients were recalled after two and four weeks from the insertion of the relined obturator for microbiological evaluation and a swab was taken each time from the same place. Swabs were obtained from the nasal surface of the surgical defect and immediately cultivated into three different media Blood Agar, Sabouraud Dextrose Agar, and Macconkey media and incubated for microbiological evaluation. The identification and quantification of the isolated microorganisms were performed using the conventional microbiological cultivation method. Finally, the collected data were tabulated and statistically analyzed. Results Statistical analysis of the collected data showed, that the difference between the two groups was insignificant. However, patients were more satisfied with obturators lined with heat-cured silicone. Conclusion It was concluded that within the limitations of this study, both acrylic resin and resilient lining materials could be used as a material for obturator construction in maxillofacial cases. However, longer follow-up period might show different results.
    Keywords Acquired maxillary defect ; Obturator ; Heat cure acrylic resin ; Heat cure-silicon ; Science ; Q
    Subject code 910
    Language English
    Publishing date 2022-04-01T00:00:00Z
    Publisher SpringerOpen
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Impact of popular beverages on polyamides versus polymethyl methacrylate denture base materials colour stability

    Marwa Hassan Mostafa / Osama Abdel-hamid Abuhelal / Ali Abdulghani AlSourori

    Bulletin of the National Research Centre, Vol 47, Iss 1, Pp 1-

    in vitro study

    2023  Volume 7

    Abstract: Abstract Background Changing of different denture base materials colours could have a detrimental impact on patients' satisfaction and make them seek more frequent adjustments to their prosthesis; hence this study was conducted to investigate the colour ... ...

    Abstract Abstract Background Changing of different denture base materials colours could have a detrimental impact on patients' satisfaction and make them seek more frequent adjustments to their prosthesis; hence this study was conducted to investigate the colour stability of the conventional denture base polymer (PMMA) and polyamides. Methods Specimens of conventional PMMA and thermoplastic polyamides were constructed according to manufacturer instructions and utilized during the current study. For colour stability test a total of 80 specimens with dimensions of 40 mm (length) X 20 mm (width) X 0.8 mm (thicknesses), the specimens in this test were divided into two equal groups (n = 40) (PMMA specimens and polyamides specimens). Results When compared to polymethyl methacrylate denture base resin, polyamid denture base resin exhibited the greatest colour change (P 0.001). For 7 and 30 days, both materials had the greatest value in tea solution. One-Way ANOVA test P < 0.00001). Conclusions Within limitation of this in vitro study, we found that heat-cure PMMA resin has the significant higher colour stability when compared to the Polyamides after immersion in the tea, cola, coffee and distilled water solutions for 30 days.
    Keywords Denture base resins ; Flexible ; Heat cured ; Colour stability ; Polyamides ; Science ; Q
    Subject code 621
    Language English
    Publishing date 2023-03-01T00:00:00Z
    Publisher SpringerOpen
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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    Inter-library loan at ZB MED

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  4. Article ; Online: Effect of primary versus secondary splinting impression techniques on the passive fit of screw-retained implant prosthesis

    Radwan Saleh Algabri / Sadeq Ali Altayyar / Hanan Omar Abo-Alrejal / Ali Abdulghani Alsourori / Dhafer Abdulwasea Alshaibani / Marwa Hassan Mostafa

    Bulletin of the National Research Centre, Vol 47, Iss 1, Pp 1-

    a randomized clinical trial

    2023  Volume 9

    Abstract: Abstract Background The utilization of splinting techniques for impression copings is commonly advised for complex implant-supported prostheses, as it can enhance the fit of these prostheses. However, there is limited understanding regarding the impact ... ...

    Abstract Abstract Background The utilization of splinting techniques for impression copings is commonly advised for complex implant-supported prostheses, as it can enhance the fit of these prostheses. However, there is limited understanding regarding the impact of the secondary splinting of implant analogues, on the passive fit of the prostheses. Limited data are available on the secondary splinting of implant analogues before pouring the impression and its comparison with the primary technique of intraoral splinting of impression copings prior to impression making. Objectives This study's objective was to determine the impact of the primary versus secondary impression splinting techniques using resin on the passive fit of screw-retained prosthesis. Material and methods This randomized clinical trial (RCT) involved two parallel groups consisting of 14 completely edentulous patients, with seven patients in each group. Each patient received a total of eight implants, four implants per arch, resulting in a total of 28 screw-retained prostheses. Two different impression splinting techniques were employed. Group (1) utilized the primary splinting technique, where the impression copings were splinted before taking the impression. In contrast, Group (2) utilized the secondary splinting technique, where the implant analogues were splinted before pouring the impression material. To evaluate the passivity of the screw-retained prostheses in both groups, a single-screw test (one-screw test) was used. Additionally, supplementary methods, including the screw resistance test, were employed. Results The findings of this RCT revealed higher passivity scores for secondary splinting impression pouring technique with a statistically significant difference (P = 0.082). There was a 2.2-fold greater frequency of non-passivity in the primary splinted method. In group (2), the likelihood of non-passivity was four times higher for upper arches prostheses, while there was no significant difference (P = 0.5) observed in both groups for lower ...
    Keywords Passive fit ; Screw-retained prostheses ; Primary splinting ; Secondary splinting ; Single-screw test ; Science ; Q
    Subject code 621
    Language English
    Publishing date 2023-11-01T00:00:00Z
    Publisher SpringerOpen
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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