Ayşe Seda ATAOL, Gulfem ERGUN, Aysel UĞUR, Nurdan SARAÇ, Tuba BAYGAR

Karvakrol ilave edilmiş antimikrobiyal yumuşak protez astarının yırtılma ve çekme bağlanma dayanımı ve sertliği

Amaç: Bu çalışmanın amacı, fenolik bir bileşik olan karvakrol (kekik yağı) ile antimikrobiyal özellik kazanmış yumuşak protez astarının protez kaide materyaline bağlanma dayanımı, yırtılma dayanımı ve sertliğini değerlendirmektir. Yöntem: Her mm3'e 0.5 mL karvakrol eklenen silikon esaslı yumuşak protez astarı kontrol grubu (karvakrol ilavesiz silikon esaslı yumuşak protez astarı) (n=10/alt grup başına) ile karşılaştırıldı. Tüm test gruplarında numunelerin yarısı distile suda (37ºC) tutulurken, diğer yarısına termal yaşlandırma (10000 termal döngü-1 hafta) uygulandı. Karvakrol ilave edilmiş ve edilmemiş yumuşak protez astarının yırtılma dayanımı evrensel bir test cihazında (Lloyd Universal Tester; AMETEK, Inc., Hampshire, İngiltere) 50 mm/dak'lık bir çapraz kafa hızında, çekme bağlanma dayanımı aynı cihaz ile 10 mm/dak çapraz kafa hızında ve sertliği dijital vikers sertlik ölçüm cihazında (HMV, Shimadzu, Tokyo, Japonya) test edildi. Aksi belirtilmedikçe, p<0.05 için sonuçlar istatistiksel olarak anlamlı kabul edildi. Ancak, olası tüm çoklu karşılaştırmalarda Tip I hatayı kontrol etmek için Bonferroni Düzeltmesi yapıldı. Bulgular: Çalışmamızdan elde edilen bulgular dahilinde, yumuşak protez astarına karvakrol ilavesi, test edilen yırtılma ve çekme bağlanma dayanımı üzerinde istatistiksel olarak anlamlı etkiler göstermedi (p>0.05). Ayrıca tüm test gruplarında kontrol grubuna göre istatistiksel olarak anlamlı bir sertlik artışına neden oldu (p<0.001). Termal yaşlandırma genel olarak mekanik özellikler üzerinde önemli bir etki göstermedi (p>0.05). Sonuç: Bu in vitro çalışma, yumuşak protez astarına antimikrobiyel etkinliği bulunan karvakrol ilavesinin malzemenin yırtılma ve çekme bağlanma dayanımına etki etmediğini, ancak sertliğini arttırdığını ortaya koymuştur.

Anahtar Kelimeler:

Protez astarları, kekik bitkisi, yırtılmalar, gerilme direnci, sağlamlık testleri

Tear and tensile bond strength and hardness of carvacrol added antimicrobial soft denture liner

Objective: The purpose of this study was to evaluate bonding strength to denture base material, tear strength and hardness of soft denture liner that gained antimicrobial properties with carvacrol (thyme oil) that is a phenolic compounds. Method: Silicone based soft denture liner added 0.5 mL of carvacrol per mm3 was compared to the control group (silicone based soft denture liner without carvacrol addition) (n=10/per subgroup). While half of the samples were kept in distilled water (37ºC) in all test groups, thermocycling (10000 thermal cycle-1 week) was applied to the other half. Tear strength of soft denture liner with and without carvacrol addition in a universal tester (Lloyd Universal Tester; AMETEK, Inc., Hampshire, UK) at a crosshead speed of 50 mm/min, tensile bond strength at 10 mm/min cross-section head speed with the same device and hardness were tested with a digital Vikers hardness tester (HMV, Shimadzu, Tokyo, Japan). Unless otherwise stated, results for p<0.05 were considered statistically significant. Bonferroni Correction was performed to control for Type I error in all possible multiple comparisons. Results: Within the findings obtained from our study, the addition of carvacrol to the soft denture liner did not show statistically significant effects on the tested tear and tensile bond strength (p>0.05). In addition, in all test groups, it caused a statistically significant increase in hardness compared to the control group (p<0.001). Thermal aging generally did not show a significant effect on mechanical properties (p>0.05). Conclusion: This in vitro study revealed that the addition of carvacrol, which has antimicrobial activity, to the soft denture liner did not affect the tear and tensile bond strength of the material, but increased its hardness.

Keywords:

Denture liners, thymus plant, tear, tensile strength, hardness tests,

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