RESUMO
Lycopene (LP), a naturally occurring carotenoid in red-coloured fruits, especially tomatoes, has a pivotal role in counteracting the deleterious effect of oxidative stress on periodontal tissues. The aim of this study is to prepare solid lipid microparticles (SLMs) encapsulating LP and to assess their biochemical and clinical effects in the management of chronic periodontitis. Optimization of SLMs was performed by assessing particle size and LP entrapment efficiency. Clinical study included 16 chronic periodontitis patients allocated into two groups, Group I was managed by scaling and root planing (SRP) and local delivery of LP loaded SLMs, while Group II was managed by SRP only. Protein carbonyl (PC) levels as a biomarker of oxidative stress and drug concentration in gingival crevicular fluid (GCF) were assessed at different time intervals. Results revealed that optimum formula of SLMs had a particle size of 77.28 µm and entrapped 98.03% of LP. SLMs recorded 30 d of drug release with no burst effect. Patients treated with LP SLMs showed significantly lower levels of PC after SRP compared to those treated with SRP only, in addition to improvement in the measured clinical parameters. In conclusion, locally delivered LP SLMs along with SRP could have a protective effect over periodontal tissues and it has the ability to decrease oxidative damage of proteins in diseased periodontium.