Effects of polishing techniques on the surface roughness of acrylic denture base resins

Kuhar, Milan; Funduk, Nenad

doi:10.1016/j.prosdent.2004.10.002

Cited by 122 publications

(121 citation statements)

References 18 publications

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“…As in all previous investigations, roughness of PMMA has been clinically acceptable (4)(5)(6)(7)(8)(9); probably this difference may reflect the insufficiency of manual polishing in our laboratories.…”

Section: Discussionsupporting

confidence: 72%

Surface roughness of two Polyamide Material Types Used in the Manufacture of Denture Base Compared with a Type of Heat-cured Acrylic Resin

Eghtedari

Ghanavati

Rohani

et al. 2017

Jentashapir J Helath Res

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Background and Objectives: Some of the disadvantages of the heat-cured acrylic resins include high porosity, high water absorption, volume changes, and a lot of residual monomer. The development of polymer chemistry produced different kinds of materials such as polyamide, Acetal resins, and etc. Recently, polyamide materials are widely used in the manufacture of denture base. Denture bases made from this material are more flexible than conventional PMMA. There is a direct relationship between surface roughness (as a result of polishing) and the retention of microbial plaque. This study compared the surface roughness of 2 polyamide materials with a heat-cure acrylic resin.Methods: A total of 60 wax samples (30 × 15 × 4 mm) were made. For preparation of PMMA specimens, 20 of the samples were heated in the 165°F water bath for 9 hours. Other 40 wax samples were used for the preparation of polyamide samples (TCS and VAL), according to the factory instructions. Polyamide samples were heated for 11 minutes at 274°C-293°C and then, injection was done for them. After finishing and polishing, the thickness of the samples decreased to 3 mm. Roughness was measured by a stylus profilometer (the length of the cutoff = 0.8 mm and speed of pen movement 0.5mm/s randomly in 3 regions of each sample. The t-test was used for a statistical analysis. Results:There is a significant difference between surface roughness of heat-cure acrylic resin with polyamide materials (P < 0.05), however there is no significant difference between surface roughness of 2 types of polyamide materials (P > 0.05). The surface roughness of all specimens was higher than the threshold level (0.2 µ).Conclusions: Due to the high surface roughness of polyamide materials, the use of polyamide materials cannot be recommended for the construction of permanent appliance. Surface roughness of heat-cure acrylic resin of Meliodent (PMMA) was higher than the accepted standard.

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Section: Discussionsupporting

confidence: 72%

Surface roughness of two Polyamide Material Types Used in the Manufacture of Denture Base Compared with a Type of Heat-cured Acrylic Resin

Eghtedari

Ghanavati

Rohani

et al. 2017

Jentashapir J Helath Res

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“…The results of the current study also showed that, even though Parylene C deposition resulted in smoother surfaces, it failed to produce surfaces with Ra values less than 0.2 μm, the threshold for microbial colonization. 11 Parylene coating, it seems, cannot replace the traditional finishing and polishing procedure of PMMA [19][20][21] in terms of initial surface roughness. However, as the fitting surface cannot be exposed to finishing treatment and constitutes the main area of bacterial accumulation and growth, Parylene coating can still be beneficial by producing smoother surfaces, which may also be more abrasion-resistant.…”

Section: Discussionmentioning

confidence: 99%

“…36 A noncontact profilometer was selected in contrast with a number of studies, in which measurement of the surface topography of acrylic resin specimens after different polishing procedures was performed by a contact stylus-type profilometer. [19][20][21] The use of a diamond or ruby stylus is related to potential damage of the specimen while it is moving on its surface. In addition, the stylus usually measures the deviations in the vertical direction without taking into account the average gradient of the surface roughness 37 and involves a more complicated procedure.…”

Section: Discussionmentioning

confidence: 99%

“…14,15 However, the SFE of a substrate is a weaker determinant of bacterial adhesion compared with its surface roughness, 16 and these properties are also affected by the acquired salivary pellicle. 17,18 Although various studies [19][20][21] have shown that laboratory and chairside polishing techniques can achieve a surface roughness below the 0.2-μm threshold for the polishing surfaces of intraoral removable prostheses made of PMMA, this does not hold true for the fitting surfaces. Denture base materials processed under ideal laboratory conditions after wax pattern investment still show Ra measurements between 3.4 and 7.6 μm.…”

Section: Introductionmentioning

confidence: 99%

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Effect of different initial finishes and Parylene coating thickness on the surface properties of coated PMMA

Bourlidi

Qureshi²,

Soo

et al. 2016

The Journal of Prosthetic Dentistry

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Statement of the Problem. The colonization of micro-organisms on acrylic resin dentures may result in denture-induced stomatitis. No efficient coating has yet been proposed to address this issue. Purpose. The purpose of this in vitro study was to assess the effect of various initial surface finishes and different Parylene (P) coating thicknesses on the surface roughness (Ra) and surface free energy (SFE) of Parylene coated polymethyl methacrylate (PMMA). Material and Methods. One hundred and sixty PMMA specimens were produced and divided into 8 groups as follows: Group A: uncoated-1000grit finish; group Ap1: 10 μm P coated -1000grit finish; group B: uncoated -1200grit finish; group Bp: 10 μm P coated -1200grit finish; group C: uncoated2400grit finish; group Cp: 10 μm P coated -2400grit finish; group Ap2: 20 μm P coated -1000grit finish; group Ap3: 30 μm P coated -1000grit finish. The Ra of all specimens was measured with a noncontact profilometer. To calculate the SFE, the Owens-Wendt approach was applied after measuring the contact angles with a goniometer. The topography of the specimens was observed by scanning electron microscope. I am happy to report that the reviewers of manuscript #JPD-D-15-00013R3, entitled "The effect of different initial finishes and Parylene coating thickness on the surface properties of coated PMMA," have recommended that it be accepted for publication, pending your responses to the following final requests:Please review the edited manuscript to ensure that your meaning has not been inadvertently altered. Please address the comments.Answer: Thank you for the acceptance of our work for publication to the JPD. We are now submitting the final revision of the manuscript entitled "The effect of different initial finishes and Parylene coating thickness on the surface properties of coated PMMA". We have accepted all Track Changes and responded to the minor queries requested. The additions are marked in blue as per the instructions.We have uploaded the TIFF files of the images without labels as requested. The images uploaded are not in composite form, but individual images. We have only left the composite images in the manuscript file for ease of final proof editing by your team.

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“…This certainly contributed to the high Ra, as it has already been shown 10,13 that polishing on a lathe is better than chairside polishing. However, it must be considered that most dentists do not have a lathe in their office.…”

Section: Braun Et Almentioning

confidence: 94%

Surface Roughness of Auto Polymerized Acrylic Resin According to Different Manipulation and Polishing Methods

Gonçalves

Spohr

Souza

et al. 2008

The Angle Orthodontist

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Objective: To test the hypothesis that no differences exists in the in situ level of surface roughness of an auto polymerized acrylic resin irrespective of the method of manipulation and polishing. Materials and Methods: Forty volunteers received the test specimens. Surface roughness was evaluated using a rugosimeter. Samples of auto polymerized acrylic resin were submitted to two methods of manipulation-mass and addition-as well as to two types of polishing-mechanical and chemical. Four test groups were designated according to manipulation and polishing techniques: mass-mechanical, mass-chemical, addition-mechanical, and addition-chemical. Five measures of surface roughness were taken from each sample and average surface roughness (Ra) was determined before and 20 days after the samples were worn by the volunteers. The data obtained were analyzed by the Student's t-test for paired samples as well as by analysis of variance. Results: Significant differences in Ra were found between mechanical and chemical polishing. Surface roughness was not influenced by manipulation techniques. Mechanical polishing presented the lowest values of Ra. There was a significant increase in surface roughness after volunteers wore the specimens for 20 days. Conclusions:The hypothesis is rejected. There were differences on the surface roughness according to the different methods of manipulation and polishing used, but high values of surface roughness were found for all groups. Mechanical polishing showed the lowest values of surface roughness and thus should be preferred.

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Effects of polishing techniques on the surface roughness of acrylic denture base resins

Cited by 122 publications

References 18 publications

Surface roughness of two Polyamide Material Types Used in the Manufacture of Denture Base Compared with a Type of Heat-cured Acrylic Resin

Surface roughness of two Polyamide Material Types Used in the Manufacture of Denture Base Compared with a Type of Heat-cured Acrylic Resin

Effect of different initial finishes and Parylene coating thickness on the surface properties of coated PMMA

Surface Roughness of Auto Polymerized Acrylic Resin According to Different Manipulation and Polishing Methods

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