The Effect of Surface Treatments on the Shear Bond Strength of a Polyamide Denture Base Resin to a Chairside Reline Resin: An Invitro study

Krishnasuthan, S (2020) The Effect of Surface Treatments on the Shear Bond Strength of a Polyamide Denture Base Resin to a Chairside Reline Resin: An Invitro study. Masters thesis, Rajas Dental College and Hospital, Tirunelveli.


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BACKGROUND: The flexible denture is becoming popularly used for patients allergic to metal and monomer. It is more aesthetic because of tissue coloured clasp, suitable in the presence of undercuts and comfortable to wear. One of the main disadvantages is that flexible denture is difficult to reline. There is not much studies in improving bond between thermoplastic resin and reline material. AIM OF THE STUDY: To evaluate the effect of three types of surface treatments and their combinations on the shear bond strength a polyamide thermoplastic denture base resin to a chairside reline resin. MATERIALS AND METHODS: 80 Polyamide specimens of dimension 10mm × 10mm cylinder were fabricated and divided into 7 groups based on the surface treatments given viz control, sandblasting, silane, acid etching, sandblasted + silane, acid etched + silane and sandblasted + acid etched + silane. Surface treatments were done on the surface of the polyamide specimen to be bonded with the chairside reline resin. Then specimens are subjected to shear bond strength testing and results were statistically analysed using SPSS software version21.0. One-way ANOVA and Post Hoc Tukey HSD test were done with the significance level set at 0.05. RESULTS: The mean bond strength of Sandblasted group was highest among all the groups with 2.58 MPa and the lowest was group 6 (Acid + silane) with 2.004 MPa. The difference is found to be statistically significant (p0.001). Tukey’s post hoc test shows inter group comparison and found that highest mean difference was found between control and Group 6 (0.57 MPa), and the lowest was found between Group 3 and Group 4 (-0.23 MPa). All the mean values were statistically significant with P = 0.05. Statistically significant difference was found in Group 1 and group 6 (0.01), group1 and group7 (0.03), group2 and group6 (0.01), group2 and group7 (0.03), group6 and group1 (0.01), group6 and group2 (0.013). CONCLUSION: Air abrasion, Silane coupling agent, Acid etching, and their combinations didn’t improve the shear bond strength between polyamide denture base resin and chairside reline resin material. Sandblasted showed slightly better bond strength but there is no statistical significance. Acid + silane showed the lowest bond strength but showed statistical significance. Clinical reline of polyamide denture base resin with chairside methacrylate resin is showed to be difficult.

Item Type: Thesis (Masters)
Additional Information: 241711203
Uncontrolled Keywords: Polyamide Denture, Shear Bond Strength, Chairside Relining, Surface Treatment, Acid Etching.
Subjects: DENTAL > Prosthodontics and Crown and Bridge
Depositing User: Subramani R
Date Deposited: 21 Feb 2021 02:02
Last Modified: 21 Feb 2021 02:02

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