A literature search was performed using MEDLINE (PubMed) and other electronic basis from 1991 to 2014. Search included books and journals based on the systematic and critical reviews, in vitro and in vivo clinical studies on molecular basis of host microbial interactions. Clearly, an understanding of the host susceptibility factor in addition to microbial factors by elucidating the molecular basis offers opportunity for therapeutic manipulation of advancing periodontal destruction. One of the hallmarks of pathogenesis is the ability of pathogenic organisms to invade surrounding tissues and to evade the host defence. This paper focuses the general overview of molecular mechanisms involved in the microbiota and host response to bacterial inimical behavior in periodontics.

Background: Psychosocial stress, have been implicated as risk indicators for periodontal disease. Minimal evidence in literature exists to assess the effect of stress reduction therapy (SRT) in the outcome of non-surgical periodontal therapy (NSPT).Objective: Hence, we aimed to explore the possibility of employing SRT in stressed patients as an adjunctive intervention in the management NSPT.Materials and Methods: Sixty male patients divided into Group 1 comprised of 20 unstressed chronic periodontitis patients receiving non-surgical periodontal therapy alone, Group 2a (20 stressed chronic periodontitis patients) received intervention focused on SPT with NSPT and Group 2b (20 stressed chronic periodontitis patients) received only NSPT without SPT. Their stress level was evaluated using a standard questionnaire method and salivary cortisol levels, at baseline and 3 months along with periodontal parameters.Results: There was significant reduction in stress parameters for Group 2a patients. The reduction of total periodontitis affected sites was highest in Group I patients (55.4%), followed by Group 2a patients (53.2%) and Group 2b patients (38%).Conclusion: SRT may result in comparable treatment outcome to unstressed chronic periodontitis patients. This study opens new avenues to investigate the effects of stress management as an adjunctive to conventional NSPT, which should be explored further.