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  • Küçük Resim
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    Performance of polyether ether ketone (peek) for dental applications: surface roughness and color stability
    (2022) Erdağ, Ümmü Habibe; Şahin, Onur; Köroğlu, Ayşegül; Özdemir, Tonguç; Dede, Doğu Ömür
    Polymeric materials are inevitably used in dental applications. Dental prostheses are cleaned during their service life, and surface roughness is an important criterion for these polymeric materials. In this study, the efect of diferent denture cleaning methods on the surface roughness and color stability of polyether ether ketone (PEEK) dental materials was studied. Seventy disk-shaped (10×3 mm) specimens were fabricated and divided into seven groups (n=10) according to the cleaning procedure. One of these groups subjected to distilled water was the control group. Other three groups were subjected to daily cleansing with denture cleaners (5% sodium hypochlorite, alkaline peroxide, chlorhexidine gluconate solution) and the other three groups were subjected to mechanical cleaning with a toothbrush with three diferent dentifrices (toothpaste, soap, and denture cleansing gel). The surface roughness values (Ra) were measured with a proflometer before (Ra0) and after cleaning procedures for 270 days (Ra1). CIELab color parameters of each specimen were measured with a spectrophotometer before and after 7 days of storage in a coffee solution. Color diferences were calculated, and data were statistically analyzed with one-way ANOVA and the Tukey HSD test (?=.05). For all test groups, Ra0 and Ra1 values were lower than the plaque accumulation threshold level (PATL) of 0.200 ?m. For both Ra and ?E00 values, the efect of the cleaning method was not statistically signifcant (P>0.05). Also, no signifcant diference was observed for Ra0, Ra1, and ?E00 values between the test groups (P>.05). It was concluded that considering the color stability and surface roughness, many cleaning procedures can be used safely for PEEK polymers.
  • Küçük Resim
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    Surface roughness and Streptococcus mutans adhesion on surface sealant agent coupled interim crown materials after dynamic loading
    (2022) Eşlemez Topçu, Eda; Şahin, Onur; Köroğlu, Ayşegül; Cömert, Füsun; Yılmaz, Burak
    Background: With the application of surface sealant agents, smooth surfaces can be achieved in a shorter time when compared with conventional polishing. However, studies on the performance of these agents against chewing forces are not many. The purpose of this study was to evaluate the surface roughness and Streptococcus mutans adhesion on surface sealent coupled interim prosthetic materials after chewing simulation. Methods: One hundred and twelve specimens were fabricated from two poly(methyl methacrylate) (Tab 2000, Dentalon Plus) and two bis-acryl (Tempoft, Protemp 4) interim crown materials and divided into 4 groups (n=7) according to applied surface treatment: conventional polishing (control) and 3 surface sealant (Palaseal, Optiglaze, Biscover) coupling methods. The surface roughness values (Ra) were measured with a proflometer before (Ra0) and after aging through dynamic loading in a multifunctional chewing simulator for 10,000 cycles at 50 N load combined with integral thermocycling (between 5 and 55 °C) (Ra1). Specimens were incubated with Streptococcus mutans suspension and the total number of adherent bacteria was calculated by multiplying the counted bacterial colonies with the dilution coefcient. Results: Surface sealant agent application signifcantly decreased the surface roughness compared with conventionally polished specimens, except for Optiglaze or BisCover LV applied Protemp 4 and Palaseal or Biscover LV applied Tempoft. Surface roughness after dynamic loading showed a statistically signifcant increase in all groups, except for the control groups of Tab 2000 and Protemp 4. A positive correlation was found between surface roughness values of interim prosthodontic materials and the quantitiy of Streptococcus Mutans. Conclusions: Even though surface sealant agent application signifcantly decreased the surface roughness compared with conventionally polished specimens, dynamic loading signifcantly increased the surface roughness of all surface sealant coupled materials. The Ra values of all test groups were higher than the plaque accumulation threshold (0.20 µm). Streptococcus mutans adhered more on rougher surfaces