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Abstract

EVALUATION THE EFFECT OF REINFORCEMENT MATERIALS AND THERMAL CYCLE TREATMENT ON SOME MECHANICAL AND PHYSICAL PROPERTIES OF SOFT LINER

Zainab Talab Kareem* and Layla Mousa Aoda

ABSTRACT

Back ground: Resilient denture liners may be advantageous for patients who are capable of delivering a relatively heavy occlusal load to unfavorable denture-bearing tissues. Without a resilient liner, surface hardness of polymethyl methacrylate may lead to chronic soreness, due to pressure on the mental foramen, sharp bony spicules, thin, atrophic mucosa, bony undercuts, particularly in the mylohyoid region, irregular bony resorption, poor fit of the denture base, incorrect occlusal relationship, bruxism, and/or debilitating disease.[1] During mastication the oral cavity gets in contact with food at different temperature, the most critical effect of temperature is due to chewing change of hot foods and drinking of cold fluids, temperature changes may affect the properties of soft liner.[2] Objective: This study was conducted to evaluation and compare the effect of added different reinforcement materials (Zirconium oxide and Titanium oxide Nano particles) incorporated with soft liner material in three concentration (0.5,1, and 1.5wt%) and thermal cycling treatment on the some properties of soft liner (roughness, hardness and water sorption). Materials and methods: Two hundred and ten (210) specimens were prepared from soft liner used in this study. Specimens were divided into three main groups according to the test (roughness, hardness, and water sorption), (70)specimens for each test, and then divided into three group (control group (10) specimens, ZrO2 (30) specimens and TiO2 (30) specimens) and then experimental groups subdivided in to three groups according the percentage each group have (10) specimens and then all groups divided in to equal halves one treated with thermal cycling treatment and another without thermal cycling treatment. The surface roughness was tested by (profilometer), while hardness was tested by(shore A) tested machine, and water sorption was tested by using (digital electronic balance). Result: The result show the surface roughness decrease when used ZrO2 in all percentage compared with control groups, while increase surface roughness in all percentage of soft liner reinforced by Titanium oxide Nano particles. Hardness and water sorption in all experimental groups reinforced by Zirconium oxide and Titanium oxide Nano particles increase compared with control groups. Conclusion: In conclusion, according to the obtained result in this study, incorporating the Nano particles into soft liner result the ZrO2 improvement the surface roughness in all percentage compared with control groups but increase in hardness and water sorption in all percentage compared with control groups, while incorporating the TiO2 Nano particles into soft liner result the increase in all test compared with control groups.

Keywords: Soft liner, Reinforcement, Thermal cycling treatment.


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