Influence of Psychological Stress on Periodontal Diseases


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Larissa Marques Storto Soares*

Citation: Larissa Marques Storto Soares, Ana Emilia Farias Pontes, Fernanda de Oliveira Bello Corrêa, Cleverton Corrêa Rabelo , ”Influence of Psychological Stress on Periodontal Diseases” American Research Journal of Dentistry, vol 2, no. 1, 2020, pp. 1-5.

Copyright Copyright © 2020 Larissa Marques Storto Soares, et al . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Abstract:

Introduction: The association between periodontal disease and stress has been questioned for a almost a century, however, it still represents an
unexplored field of research with several orphaned questions of conclusive answers. Objective: To evaluate the relationship between periodontal
disease and stress. Methodology: Searches were performed with descriptors related to periodontal diseases and psychological factors in the
following databases: Pubmed, Embase, Lilacs. Were identified and included studies that deal with the relationship between stress and periodontal
disease and /or that emphasize the role of this psychosocial factor in the progression of periodontal disease. Conclusion: Most studies have shown
a positive relationship between periodontal disease and stress, however, further research needs to be developed to confirm stress as a risk factor
for periodontal disease.

KEYWORDS: Psychological stress, Periodontal disease, Risk factors



Description:

INTRODUCTION

Since the middle of the last century, research has been carried out to seek evidence on the role of stress in the development of periodontal diseases. Stress is defined as a non-specific response of the organism to stimuli that counteract its homeostasis,[1] and this relationship between stress and systemic diseases is explained by hormonal changes and behavioral changes that are precisely induced by stress.[2] The search for homeostasis leads to the activation of allostatic systems, generating an energy expenditure in the body, known as allostatic charge. When this activation occurs in an excessive way, the phenomenon called allostatic overload occurs, where physical and mental pathologies can develop.[3]

It is known that stress is a risk factor for systemic diseases, such as cardiovascular diseases. Inability to defend one’s rights, difficulty expressing feelings, and emotional stress are important factors in the magnitude of cardiovascular reactivity in response to stressful events experienced by mild hypertensive patients. According to the V Hypertension Guidelines (2006), hypertensive patients must undergo psychological training to develop ways to cope with excessive stress, to avoid its negative consequences.[4]

Stress, when not relieved, has a negative impact on health, and when uncontrolled, mediates or contributes to problems ranging from cardiovascular damage to impaired cognition, due to the possible neurodegeneration it causes.[5]

This psychosocial behavioral factor has also been increasingly associated with the pathogenesis of the periodontal disease. In the analysis of humoral immunity, an evident relationship was found between serum concentrations of stress-related proteins and periodontal disease.[6]

Several psychological disorders have shown an association with periodontitis, as well as with the progression of periodontal disease.[7] When the body has its state of homeostasis challenged, the stress cascade is activated so that the body makes the necessary physiological and metabolic changes to deal with this demand. When the body experiences a stressful event, the hypothalamus releases corticotropin-releasing hormone (CRH), resulting in the release of adrenocorticotropic hormone (ACTH), into the general circulation. ACTH acts on the adrenal cortex, which releases specific glucocorticoid species in the blood, which in turn, act negatively to complete the release of CRH. The body tries to keep glucocorticoid levels within a limit, and interference at any axis level influences the other components through feedback loops.

Over- or underproduction of cortisol can result in Cushing’s and Addison’s diseases, respectively, however, less severe deregulation of the Hypothalamus-Pituitary-Adrenal (HPA) axis can also have negative consequences, such as visceral fat deposition and cardiovascular disease (atherosclerosis ). [8] By itself, stress is not harmful, but it becomes harmful when the stress load overcomes the individual’s ability to adjust and
he begins to experience its negative consequences. On the other hand, when the individual can cope with the stressful experience, the organism is able to return to the state before homeostasis, of well-being.[9]

In short, what matters is not how much stress the living being is exposed to, but how and what means it has to deal with this demand. As for distress, this psychosocial manifestation is characterized by the inability to overcome stressful demands, leading to the breakdown of individual well-being. The distress has a multidimensional character, since multiple events, seen by the individual as a threat, can generate it.10 It is known as an emotional disorder that can impact people’s social interactions and daily lives [11] and is associated with an adaptation difficulty that impairs the individual’s feeling of well-being, that is, the agents that perform the construction of psychological wellbeing and satisfaction, fail.[12]

To be mentally healthy is not to be free of symptoms or psychological disorders. Mental health is defined by the degree of manifestation of well-being and distress that human beings demonstrate. [13] The elevated and prolonged levels of distress associated with the reduced sense of well-being help
to make subjects vulnerable to the disorder. The degree and how the distress is experienced can be evident by the degree of dysfunctionality presented.[14] The relationship between anguish, depression, and anxiety raises the question whether distress, if left untreated, can lead to depression.[15]

STRESS AND PERIODONTAL DISEASE

As neglect of care with oral hygiene, a bacterial invasion is facilitated, the immune response becomes weaker, and consequently periodontal disease is reinforced by stress.[16] Chronic stress is known to activate the HPA axis, with the consequent release of the hormone cortisol that leads to a
decrease in the defenses of the immune system, for days or months.[17] Some studies carried out in animals where epinephrine was injected, it was observed migration of lymphocytes from Organs lymphoid organs into the blood and lymphatic stream and a reduction in the effectiveness of their functional activity.[18] In another experiment, there was an increase in Natural Killer cells and neutrophils after administration of catecholamines, adrenaline and norepinephrine, and a drastic decrease in T and B cells in plasma levels.19 These experimental animal studies support the hypothesis that the stressed individual’s immune response capacity in the face of the bacterial attack of periodontal disease becomes impaired, which then facilitates the disease’s progression.

An experimental animal trial showed that there were no significant differences (P> 0.05) in the inflammatory infiltrate, loss of insertion or bone resorption between the two groups of animals restricted and subjected to different levels of stress, which perhaps can confirm the thesis that the destructive effect of stress does not depend on the time in which the individual is exposed, but on how he supports these stressful loads.[20]
The HPA (hypothalamus-pituitary-adrenal) axis is activated by chronic stress and leads to a decrease in the number of circulating leukocytes. This fact occurs both during a period of severe stress and in the late response to stress.[21]

Confirming this fact, a study carried out with students found that, during the exam week, students had a delay in the healing of mucosal
wound, when compared to their healing abilities during the vacation period. During this testing period, healing was approximately 40% slower. [22]
Glucocorticoids regulate several bodily functions, including the response of inflammatory cells to microorganisms. Hyperactivation of the HPA axis generates less regulation of cell-regulated immunity and greater regulation of antibodymediated immunity.[23] A study corroborated this thesis, showing that as the level of glucocorticoid in human blood increased, there was suppression in the production of interleukins 12 (IL12) and an increase in the production of interleukin 10 (IL10).

This type of cytokine production alters the inflammatory response, which changes from cell-mediated to a reaction with increased antibody production. For the authors, stress can suppress the function of Th1 cells, leading to a change in the production of cytokines, which is now carried out by Th2 cells, which can have very important consequences in the progression of periodontitis and other infectious diseases. [24] An experimental animal trial confirmed that stress worsens bone loss caused by periodontal disease since by inhibiting chronic stress in rats, with fluoxetine, it was observed that this medication was able to reduce bone loss aggravated by stress.[25]

Likewise, another experimental animal trial demonstrated this fact. Through the use of diazepam, the authors state that the group subjected to stress showed an increase in alveolar bone loss and an increase in IL-6 and IL-1B, while the stressed group treated with diazepam, demonstrated a decrease in IL levels. -6, IL-1B and loss of alveolar bone.[26] Some studies call attention because they do not show differences in the prevalence or extent of periodontal disease, between depressed and non-depressed patients.[27] These divergences in results between studies relating periodontal
disease and psychological disorders, such as stress and depression, may perhaps be justified by the fact that the selfperception of health and illness is different among individuals, and the way in which each faces their psychological condition too. In other words, a patient with signs of depression may
not perceive himself as such, while other individuals may not be diagnosed with the disease and still be multi-compliant. Patients can be registered as being depressed, not being, or as not being depressed, even if they are.

The disparity between experience and perception of health problems suggests that people deny and repress the stress of their lives.28 In addition, there are different means of assessing stress, which can result in different results and diagnoses. Currently, standardized scales are used to assess and measure psychological distress, however, several of them were created without a conceptual  basis and are still used.13 Therefore, researchers are looking for more accurate means of assessing stress, such as the measurement of cortisol concentration, since its concentration demonstrates how much was activated for the first phase of allostasis and for how long the suppressive response of the body’s initial reaction to stress, vigorous.9 There are also mathematical means of measuring stress, where a derivative is used, derived from the trapezoid formula, in which the cortisol values are inserted in this formula,29 measurement of stress through capillary cortisol, in which it is possible to check the long-term stress level,30 biochemical measures, where the concentrations of catecholamines in plasma and urine are evaluated, as they are activated in the initial reaction to stress,31 and the physiological measures of stress, which are related to the levels of wear or changes in the functional pattern of systems or structures of the organism, such as, for example, total cholesterol, waist-hip circumference, and fat deposit.32

In an investigation of the role of psychological disorders, such as depression, stress and anxiety in the progression of periodontitis in advanced stages, periodontal clinical and radiological evaluations were carried out in 108 individuals and the authors concluded that it is possible to accept the hypothesis of a correlation between the two variables.33 One study evaluated the outcome of periodontal treatment in depressed patients. The presence or absence of depression was the main independent variable, having been determined by the presence of any diagnostic code for depression in the patient’s record. After a year of follow-up, patients with depression were more than twice as likely to experience sub-median results from periodontal treatment compared to patients without depression. Also according to these authors, the regression models demonstrate that the increase in the depth of the scholarship is significantly predicted by factors of occupational stress-type A personality, perception of physical problems, lack of information about changes in the work environment, as well as behaviors health benefits to maintain high health status. What draws attention is the fact that there was no difference in the prevalence or extent of periodontal disease at the beginning of the study between depressed and non-depressed patients.27

A study investigated the effect of occupational stress on periodontal health and the authors concluded that the participants needed to control their health, which was reflected in their inconsistent responses regarding the perception of health problems and the experience of symptoms related to stress.34 In a cross-sectional study, stress, cortisol and periodontitis were associated. For this, the patients’ saliva was collected at three times of the day (morning, afternoon and night). Cortisol levels were positively associated with the extent and severity of periodontitis. Although the authors collected cortisol in just one day, they associated this measure with a questionnaire and Lipp’s Stress Inventory, which reinforces the veracity of the result found.35 Likewise, authors associated the measurement of salivary cortisol with a stress questionnaire from the National Institute for Stress at Work and Health, to relate periodontitis to self-reported stress, and salivary cortisol as a means of identifying work stress. For that, 180 workers from two industries were evaluated and found that 82% of the participants reported being stressed, and of the sixty participants who presented saliva
samples, almost 3/4 showed positive work stress. According to the authors, the chance of having periodontitis is six times greater in people who have positive work stress, compared to those who do not. [36]

In a study on the effects of stress under non-surgical periodontal treatment, chemical and biological markers from patients with chronic periodontal disease were used. Initial levels, biological markers and clinical parameters were similar in groups of stressed and non-stressed patients. Elastase levels
were higher in the group of stressed patients (p> 0.05), and these showed a poorer response to periodontal treatment.[37] Another study evaluated the influence of stress and anxiety on the response to periodontal treatment in patients with chronic periodontal disease. According to the authors, stressed patients did not show a reduction in the depth of the pocket, which reinforces the role of stress for the progression of periodontal disease, as well as for the failure of periodontal therapy.38  A case-control study related periodontal disease to psychosocial factors. For this, in addition to assessing the depth of probing levels, insertion level and bleeding at probing, four tests were applied to assess stress, anxiety and depression. Through bivariate and multivariate logistic regression analyzes, the results showed a positive association between periodontitis, age, male gender, smoking and educational level. However, the bivariate analysis did not show significance between psychosocial factors and periodontal disease. According to Reis (1997), only multivariate statistical analysis allows us to assess the joint role of variables and determine the influence or importance of each one.[39]

Stress was evaluated as a possible risk factor for periodontal diseases through a systematic review with the search for scientific evidence in this correlation. Most of the included studies demonstrated a correlation between stress and periodontal disease, however, the authors highlighted the heterogeneity of the studies and the risk of bias in the lack of standardization of their methodologies. The importance of standardizing measures was reaffirmed as a means of achieving similar results when it is desired to correlate the same factors. The criteria for periodontal evaluation and psychological evaluation questionnaires should be standardized, however, we perceive different methodologies in the studies, both concerning the diagnosis of periodontal disease, and the instruments used for the diagnosis of mental stress.[40]

CONCLUSION

Understanding the dynamics of stress and how it impacts people’s habits and behaviors, studies included in this review showed the influence of stress both on the progression of periodontal disease and on its onset. From these revised articles, it was not possible to conclude whether stress can be considered a risk factor for periodontal disease, as it is still necessary that studies use a standardized methodology in determining the diagnosis and measuring stress levels. Only in this way will we be able to confirm, from evidence, stress as being or not a risk factor for periodontitis.





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