Introduction: Chronic periodontitis is the most common periodontal disease which is related to the chronic accumulation of bacterial plaque. Since mechanical methods are not sufficient in the treatment of this disease, administration of local/systemic antibiotic is recommended following mechanical debridement. However, side effects of antibiotics such as microbial resistance and patient allergy led to development of alternative methods. One of these suggested methods is the antimicrobial photodynamic therapy (aPDT). PDT is a local noninvasive treatment modality without the side effects caused by antibiotics. The aim of this study was to review the articles related to the application of PDT with laser in the treatment of chronic periodontitis. Review of literature:In the present review of literature, the authors used key words such as chronic periodontitis, laser and photodynamic therapy, and conducted a literature search via Google Scholar and PubMed for the period of 1990 to 2015. A total of 47 articles in English were found. The articles that were not associated with the topic of research and review articles were deleted and only clinical trials were evaluated. After reviewing 23 articles' abstracts, the full texts of 16 articles were analyzed. Conclusion: Considering the safety, the lack of side effects and general advantages like more patient compliance, the PDT treatment with scaling and root planing (SRP) is recommended as an efficient adjunctive modality for the treatment of localized chronic periodontitis especially during the maintenance phase in non-surgical treatment.

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Bone cells need solid structures like the extracellular matrix (ECM) for healing injured areas. Finding appropriate materials and fabrication processes for the scaffold is a challenge in tissue engineering. In this study, 3-D porous scaffold was made of Polycaprolactone/Gelatin/Nanoclay (PCL/GNF/NC) and different dosages of silybin (Sil) were loaded by a combination of electrospinning and thermal-induced phase separation (TIPS) techniques. Different experiments like assessing surface morphology, porosity, compressive strength, water contact angle, degradation rate, releasing profile, hemolysis, and cell proliferation were done to assess attributes of fabricated scaffolds. For in vivo evaluation, the calvaria defect model in rats was used and the result was evaluated by histological analysis. Based on the results, the porosity of scaffolds was in the range of 70-90%, and samples containing silybin had lower compress strength and contact angle and higher degradation rate in comparison with samples without silybin. The results showed that PCL/GNF/NC/Sil1% had better cell proliferation bone healing than other studied groups. The results of this study can be considered for further researches to assess the effect of silybin in bone defect treatment.