This chapter describes the miscellaneous topics, which include periodontal tissue engineering, periodontal microsurgery, photodynamic therapy, platelet concentrates, lasers in periodontics, and nanotechnology in periodontics. Periodontal disease leads to loss of periodontal supporting structures like cementum, the periodontal ligament and the alveolar bone. Periodontal treatments like scaling, root planing and gingival curettage are effective in repairing disease-related defects and halting further progress of disease, but the ultimate goal is regeneration of the diseased periodontium. Microsurgery can be defined as refinement in operative technique by which visual acuity is enhanced through the use of the surgical operative microscopes. Photodynamic therapy (PDT) also known as photoradiation therapy, phototherapy, or photochemotherapy, utilizes a photoactive dye (photosensitizer) that is activated by exposure to light of a specific wavelength in the presence of oxygen.