Effect of Plant Fixed Oil Extracts Incorporation to Heat Cured Denture Soft Lining Material on its Mechanical Properties

Nadira A. Hatim, Ali Khalil Hassan Sayidmarie


Introduction: Denture liners have been used in dentistry for many years. They are used to enhance the fit of poor fitting dentures and prevent trauma to sensitive mucosa. Patients with complete dentures are satisfied with the masticatory ability provided by the soft lining materials. Requests for improvements to certain features of denture base materials have also been grown.
Aims: The aims of this study were to evaluate the effects of incorporation of either single oil (Sesame, Thyme) or mixture of two oils (Sesame and Thyme) addition on some denture soft lining material (Vertex) mechanical properties (Tensile strength, elonga- tion, Shore A hardness, modulus of elasticity); cured according two different curing cycles (short and long) after two periods of immersion 2 and 30 days.

Materials and Methods: A total samples of (200) were prepared from acrylic based heat cured denture soft lining material (Ver- tex), which divided into two main groups (short curing cycle and long curing cycle according to ADA) respectively, each main group was subdivided into four groups according to oil addition [Sesame, Thyme, mixed (Sesame and Thyme), and control group]. Tensile strength and elongation percentage tests were done on main group one (short cycle), while Shore A, modulus of elasticity tests were done on each of two main groups (short and long cycle). The tests were done after two periods of immersion in distilled water (two and thirty days).

Results: The results of this study showed that plant oil extract of (Sesame and Thyme) at 5% per volume addition into monomer resulted in significant viscoelastic properties enhancement at p ≤ 0.05 (Tensile strength, elongation, Shore A and modulus of elas- ticity).
Conclusions: It is concluded that plant fixed oil extracts addition further enhanced viscoelastic properties of denture soft lining materials. Different curing cycle methods (short and long) had no effect on properties of denture soft lining material.

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DOI: http://dx.doi.org/10.26477/idj.v34i1.176


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