Effect of different surface modifications on the bonding of a soft liner to a denture base material

Abstract

Farklı yüzey modifikasyonlarının yumuşak astarın protez kaide materyaline bağlanması üzerine etkisi Amaç: Çalışmanın amacı, polidimetilsiloksan protez astarının farklı boyutlardaki alüminyum oksit parçacıkları ile kumlanmış olan protez kaide maddesine gerilme bağlanma mukavemetini araştırmaktır. Gereç Yöntemler: Dikdörtgen prizma şeklinde kırk adet ısı ile polimerize edilmiş akrilik örnek bağlantı dayanımı için değerlendirilecektir. Örnekler uygulanan yüzey işlemine göre 4 test grubuna ayrılmıştır. Grup I: Yüzey işlemi uygulanmayan (kontrol grubu), Grup II: Kumlama ile birlikte tribokimyasal silika kaplama, Grup III: 50 μm alüminyum oksit partikülleri ile kumlama, Grup IV: 110 μm alüminyum oksit partikülleri ile kumlama. Bütün örnekler yumuşak astar ile bağlantı sağlandıktan sonra 5000 devir termal siklusa tabi tutulmuştur. Bağlantı değeri, evrensel test cihazı kullanılarak çekme test ile belirlenmiştir. Verilerin normalliği Shapiro-Wilk testi ile test edildi. Tüm veriler tek yönlü ANOVA kullanılarak analiz edildi ve ortalama değerleri Tukey'in HSD testi ile karşılaştırıldı. (p <0.05). Bulgular: En yüksek bağ mukavemet değeri Grup II'de (1.51 ± 0.41 MPa) gözlendi. En düşük değer, yüzey işlemi uygulanmayan örneklerin bulunduğu grupta gözlendi (0.85 ± 0.27 MPa). Grup I, grup II ve grup III'den anlamlı olarak farklıydı (p <0.05). Sonuç: Akrilik yüzeylerin 30 μm silika kaplı alüminyum oksit ve 50 μm alüminyum oksit partikülleri ile kumlama işlemine tabi tutulması, bağlanma mukavemetini anlamlı olarak artırdı. ANAHTAR KELİMELER Polimetilmetakrilat, yumuşak astar, yüzey özellikleri, çekme dayanımı ABSTRACT Effect of different surface modifications on the bonding of a soft liner to a denture base material Background: The purpose of the study was to investigate the tensile bond strength of polydimethylsiloxane denture liner to denture base which was sandblasted with different size of aluminum oxide particles. Methods: Forty rectangular heat-polymerized acrylic resin samples were processed for bond strength test. Samples were divided into 4 test groups (n=10) according to the surface treatment as follows: Group I: no surface treatment, Group II: sandblasted and coated with tribochemical silica, Group III: sandblasted with 50 µm aluminum oxide (Al2O3) particles, Group IV: sandblasted with 110 µm Al2O3 particles. All samples were subjected to 5000 cycles of thermal cycling after connection with soft liner. The bond strength was determined by the tensile strength test using a universal testing machine. The normality of the data was tested by Shapiro-wilk test. All data were analyzed using one-way ANOVA, and their mean values were compared using Tukey's HSD test (p<0.05). Result: The highest bond strength value was observed in Group II (1.51 ± 0.41 MPa). The lowest value was observed in control group of untreated samples (0.85 ± 0.27 MPa). Group I were significantly different (p<0.05) from group II and group III. Conclusion: Sandblasting with 30 μm silica-coated aluminum oxide and 50 μm aluminum oxide particles significantly ...

Evaluation of Helium Plasma Surface Modification on Tensile Bond Strength of Denture Base Materials: A Scanning Electron Microscope Study

“…In the presence of sharp alveolar ridge, thin atrophic mucosa, bone undercuts, and xerostomia patients cannot withstand the forces that occur during chewing. 1,2 In this case, soft liners are applied to the tissue surfaces of the prosthesis that comes into contact with the oral mucosa to ensure a balanced distribution of chewing force and prevent traumatization of the sensitive mucosa. 1 For good shock absorption, the thickness of the soft liner should be between 2.4 and 3 mm.…”

“…3,4 Soft liners have several disadvantages such as low tear strength, losing their softness over time, water absorption, porosity, Candida albicans colonization, and failure to bond to the denture base material. 2 It is known that silicone-based soft liner materials are more flexible in changing oral conditions and better preserve their physical properties. However, the main disadvantage of siliconebased soft liner materials is the deterioration of the bond over time due to their structural differences with PMMA.…”

“…To overcome this problem, many studies have attempted to provide a reliable bond between the denture base resin and the soft liner using lasers, alumina coating, acetone solution application, chemical etching and plasma treatment. 1,2,[10][11][12][13] The use of airborne particle abrasion is one of the most common methods for modifying acrylic surfaces, which increases the TBS between heat polymerized PMMA and silicone-based soft liner. However, this process can adversely affect the strength of the denture base material.…”

“…However, this process can adversely affect the strength of the denture base material. 2 Plasma processes are widely used to alter the properties of materials such as surface roughness, biocompatibility, wettability, fungal adherence and bond strength. [14][15][16][17] Plasma is a partially ionized gas that includes ions, electrons, photons and neutral species.…”

“…28 Shear, peel strength, and tensile tests are used to evaluate the TBS of soft liners. 2 The literature review shows that the most common test for evaluating the bond strength between acrylic resin and soft liner materials is the tensile test. 13,20 This is because the tensile test provides reliable results and is easy to apply.…”