Investigation of the mechanical properties of lavender-reinforced heat-activated polymethyl methacrylate denture base resin

Anitha Kuttae Viswanathan; Rajkumar Krishnan

doi:10.1016/j.prosdent.2024.11.005

Investigation of the mechanical properties of lavender-reinforced heat-activated polymethyl methacrylate denture base resin

J Prosthet Dent. 2024 Nov 22:S0022-3913(24)00741-8. doi: 10.1016/j.prosdent.2024.11.005. Online ahead of print.

Authors

Anitha Kuttae Viswanathan¹, Rajkumar Krishnan²

Affiliations

¹ Professor, Department of Prosthodontics and Crown & Bridge, SRM Dental College, Ramapuram campus, SRM Institute of Science and Technology, Chennai, Tamil Nadu, India. Electronic address: [email protected].
² Dean of Academics, Professor, and Head of the Department, Department of Oral Maxillofacial Pathology, SRM Dental College, Ramapuram campus, SRM Institute of Science and Technology, Chennai, Tamil Nadu, India.

PMID: 39580314
DOI: 10.1016/j.prosdent.2024.11.005

Abstract

Statement of problem: The antimicrobial efficacy of lavender has been well evidenced. However, investigations into its impact on the mechanical properties of denture resins are lacking.

Purpose: The purpose of this in vitro study was to evaluate the flexural strength, impact strength, surface characteristics, roughness, elastic modulus, and yield strength of lavender-reinforced, heat-activated polymethyl methacrylate denture base resin.

Material and methods: A total of 200 specimens were categorized into 5 groups based on 0, 0.5, 1.0, 1.5, and 2.0 wt% of dry lavender extract incorporated into heat-activated polymethyl methacrylate denture base resin powder. Unmodified resin served as the control group. Flexural strength, elastic moduli, and yield strength were determined with a universal testing machine, impact strength with an Izod impact tester, surface characteristics with scanning electron microscopy, and roughness with a profilometer. The data were statistically analyzed with 1-way ANOVA followed by Tukey post hoc tests for pairwise comparison within the groups (α=.05).

Results: Compared with the control group, all the mechanical properties significantly improved with the addition of lavender (P<.001). The highest flexural, yield, and impact strengths and elastic modulus values were in the 2% group. Elevated surface roughness in 0.5, 1.0 and 1.5 wt% and a decline in roughness at 2 wt% were noted when compared with the control group.

Conclusions: The addition of lavender enhanced the flexural strength, yield strength, impact strength, elastic moduli, and decreased surface roughness when added at 2 wt%.