Periodontal diseases: is it possible to prevent them? A populational and individual approach

Abstract

Periodontal diseases are infectious inflammatory chronic diseases of a multifactorial nature. They are primarily caused by dysbiotic ecological changes in dental biofilm, which may be influenced by risk factors. The prevention of periodontal diseases may involve different strategies focused on reducing distal, intermediate, and proximal risk factors at both the population and individual levels. Effective prevention depends on interdisciplinary and common risk factor approaches. Also, patient-centered preventive models are more effective than professional-centered models in the management of periodontal diseases. Regular and periodic control of dental biofilm is an essential measure for the different levels of prevention of periodontal diseases. The effectiveness of periodontal disease prevention largely depends on positive modifications of behavior, knowledge, health literacy, patient empowerment, motivation, and compliance.

Health Education; Periodontal Diseases; Public Health; Risk Factors

Introduction

Periodontal diseases are microbially-associated, host-mediated inflammatory chronic diseases of a multifactorial nature. Biofilm accumulation and dysbiotic ecological changes are the primary causes of periodontal diseases, which may be influenced by risk factors leading to disease initiation and progression.¹ Prevention of periodontal diseases may involve different strategies focused on tackling modifiable risk factors at both the population and individual levels within the causal chain throughout the disease process (Figure 1). Primary prevention refers to a preclinical stage with the aim of preventing the onset of the disease by reducing the risk factors of biofilm development and gingival inflammation. Secondary prevention concerns the proper management of the disease at an early stage based on timely diagnosis and prompt treatment to regain periodontal health. Tertiary prevention applies to established and irreversible disease in order to restrain the sequelae, restore functions, and prevent the recurrence of the disease.²

Figure 1
Periodontal risk factors. Adapted from Bouchard et al.3

Effective prevention of periodontal diseases may be achieved through targeted and high-risk approaches aiming to reduce distal, intermediate, and proximal risk factors (Figure 1). The control of the periodontal causal chain is the cornerstone of success in prevention and periodontal therapy.³ Whole-population approaches focus on environmental conditions as the major determinants of the diseases to increase overall population health by shifting the distribution of population risk exposure toward a lower mean.⁴ Targeted approaches are directed at population groups who are at higher risk of periodontal disease (e.g. diabetic patients) through behavioral changes. High-risk approaches represent the traditional biomedical approach where susceptible individuals are identified and treated.⁴ Trends in patient care are shifting from the traditional biomedical model to comprehensive patient-centered approaches,² whereby the individual is the central point in healthcare and the socioenvironmental context of that individual is considered.

The present manuscript addresses the prevention of periodontal diseases with focus on high-risk approaches, including oral hygiene instructions and mechanical or chemical biofilm control. Other preventive strategies that have been receiving attention recently are also included, as they have started changing the way clinicians manage the disease. They include complex educational programs involving psychological and behavioral changes, patient empowerment and self-management, and acquisition of therapeutic skills.²

Mechanical biofilm removal

Regular and periodic control of dental biofilm is an essential measure for the prevention and treatment of plaque-induced periodontal diseases. Management of gingivitis is the primary preventive determinant of periodontitis onset and the secondary preventive characteristic for periodontitis recurrence.⁵,⁶ Compelling evidence has shown that bleeding sites have 70% more attachment loss than non-inflamed sites.⁶ Effective daily tooth brushing is effective in reducing plaque from tooth surfaces. Accordingly, evidence from systematic reviews indicates that a single episode of manual tooth brushing reduces dental plaque by 42% on average, and greater benefits can be achieved with powered toothbrushes.⁷ Likewise, evidence suggests that the use of powered toothbrushes is more effective in the reduction of gingival inflammation than manual toothbrushes. Also, oscillating-rotating toothbrushes seem to produce better clinical outcomes.⁷ However, the importance of the reductions of dental plaque and gingivitis for the prevention of periodontitis is questionable, since no study has directly evaluated the long-term effects of dental plaque and gingivitis control in the stability of periodontal health.

Current evidence of the use of interdental plaque control indicates that the use of dental floss in combination with tooth brushing does not provide further benefits for dental plaque removal than tooth brushing alone, but may result in lower levels of gingival inflammation. However, patients with a history of periodontitis should use interdental brushes for interproximal plaque removal. The combined use of interdental brushes and tooth brushing promotes greater reductions in dental plaque and gingival inflammation as compared to tooth brushing alone or when associated with dental floss.⁸

Nevertheless, optimal levels of oral hygiene may not be achieved without prior removal of pre-existing heavy deposits. Therefore, professional mechanical plaque removal (PMPR) is frequently done with this purpose. Although there is a lack of robust data to enable definitive conclusions about the effects of PMPR on the primary prevention of periodontitis, low-to-moderate evidence indicates that PMPR, particularly when combined with oral hygiene instructions (OHI), can result in greater reductions of plaque and gingival inflammation in patients with gingivitis.⁹ Existing knowledge also suggests that the magnitude of these effects is positively correlated with the frequency of PMPR. However, PMPR may not result in additional benefits for plaque and gingivitis control over those achieved by repeated OHI only in these patients.⁹ The direct effect of PMPR on the secondary prevention of periodontitis has not been clarified yet, since it is usually part of a comprehensive periodontal maintenance program.

Chemical biofilm control

The adjunctive use of antimicrobial agents to control dental plaque is indicated for patients with difficulties in maintaining appropriate plaque control through mechanical methods or reaching interproximal areas. In this context, dentifrices and mouthrinses with antimicrobial agents are efficient to help prevent gingivitis and produce better clinical outcomes than what can be accomplished with self-performed mechanical plaque control only. Overall, oral rinses with anti-plaque agents can reduce gingivitis by approximately 23%, while tooth brushing with toothpaste reduces gingivitis by 21%.¹⁰ Even though systematic reviews suggest that mouthrinses consistently promote greater reductions in gingival inflammation than dentifrices, their real-life efficacy might be limited because patients would have to incorporate a new habit into their daily routine. Since dentifrices are commonly used by the general population, they might be considered more suitable to achieve sustainable clinical gains than mouthwashes.¹⁰

In general, most antimicrobial agents added to dentifrices (e.g. zinc citrate, stannous fluoride) generate similar and significant anti-plaque and gingivitis responses in patients with gingivitis.¹¹ However, other agents, such as chlorhexidine (CHX) (0.1%), can promote greater reductions in dental plaque and gingivitis. The possible benefits of dentifrices containing antimicrobials for the periodontal status of patients successfully treated remain unknown due to the scarcity of evidence. Nonetheless, available data suggest that the combined use of dentifrice and mouthrinse containing amine fluoride (AmF) and stannous fluoride (SnF2) reduces dental plaque levels by nearly 10%. No further effects on other clinical parameters in patients undergoing periodontal maintenance have been observed.¹⁰

There is sound evidence that the adjunctive use of CHX mouthrinse in patients with gingivitis can reduce dental plaque and gingival inflammation by 33% and 26%, respectively (Table). However, the long-term use of CHX mouthrinse is limited because of side effects like tooth staining and alterations in taste. For long-term use, essential oils (EO) and cetylpyridinium chloride (CPC) are considered better therapeutic options, since both are effective in reducing dental plaque by 27% and 15% and gingivitis by 18% and 13%, respectively.¹⁰,¹¹ Notably, current evidence suggests that EO is a reliable alternative to CHX in the management of gingivitis in the long term.¹²The long-term use of EO results in a higher percentage of sites with no gingivitis in comparison with mechanical control alone.¹³

Table
Percentage of biofilm and gingivitis reduction according to antimicrobial agents.

Antimicrobial agents	Percentage of biofilm and gingivitis reductions
	Plaque index	Gingival index
Chlorhexidine (CHX)	33%	26%
Essential oils (EO)	27%	15%
Cetylpyridinium chloride (CPC)	18%	13%

• Based on Serrano et al.¹⁰ and Figuero et al.¹⁰

The long-term use of CHX mouthrinse for secondary prevention has been shown to promote considerable reductions in dental plaque and gingivitis by approximately 20%,¹⁴ but there is no data on the effectiveness of CHX mouthrinse to prevent periodontal disease recurrence. Additional studies are needed to investigate the effect of EO and CPC-based mouthrinses on secondary prevention.

Common risk factor approach

The common risk factor approach (CRFA) proposes an integrated strategy by addressing common risks to chronic conditions, including diabetes, cardiovascular diseases, cancers, and periodontal diseases, within a wider socioenvironmental context.¹⁵ The central concept underlying CRFA is that controlling a relatively small number of risk factors would positively impact on a considerable number of diseases (Figure 2). In addition, CRFA focuses on oriented health policies for the whole population and for groups at risk rather than on disease-specific at-risk groups. Behavioral risk factors, such as smoking, alcohol consumption, unhealthy diet, and physical inactivity are frequently clustered in groups of people with greater vulnerability to chronic diseases. Health attitudes and individual behaviors are also influenced by the complex interactions between contextual socioeconomic, political, and cultural factors.²,¹⁶

Figure 2
Risk factor approach in promotion of oral health. Adapted from Sheiham and Watt15 and WHO.16

Taking integrated action to reduce diseases of multifactorial causation by tackling several risk factors related to one or more diseases results in low cost, efficient and effective public health interventions. The use of CRFA to prevent and reduce periodontal diseases must be implemented through comprehensive health promotion strategies. The WHO has advocated a range of global public health actions to reduce tobacco consumption, such as those supporting the enforcement of bans on tobacco advertising and smoke-free environments.¹⁷ These actions serve as an example of effective public health strategies related to CRFA with the potential to reduce periodontal disease and other chronic diseases. The bi-directional relationship between periodontitis and diabetes is striking, and preventive and management strategies of both diseases are similar. Indeed, both conditions are of multifactorial etiology, share similar risk factors, require a patient-centered approach and therapeutic education, and their control relies on self-management and monitoring of the condition.¹⁴

Periodontal prevention depends on interdisciplinary approaches with other medical and dental specialties. Dentists tend to not participate in healthy lifestyle programs and there is a lack of knowledge about periodontal diseases among health professionals. There are several preventive programs to reduce chronic diseases in different countries, but oral health is rarely included in them. Hence, a shift towards CRFA to reduce the most common oral diseases, including periodontal disease, is needed in government preventive programs and strategies, with the participation and commitment of oral health professionals.¹⁸

Socioeconomic position

Socioeconomic position (SEP) indicates the social and economic aspects that influence what position individuals or groups hold within the structure of a society. SEP encompasses several exposures, resources, and susceptibilities that may influence health through relations of power and access to goods and services. Lower SEP is a well-identified risk indicator for periodontal diseases at contextual and individual levels.¹⁹,²⁰ The use of SEP is essential to examine the role of SEP in health. Yet, distinct SEP indicators that are different in nature have been used with the same meaning in health research, such as social class, social stratification, social or socioeconomic status. Thus, evidence about this topic is unclear and questionable due to the different theoretical bases of SEP measures. Moreover, most studies addressing the social epidemiology of health were conducted in developed countries. Therefore, research outputs about this topic are limited for low- and middle-income countries. SEP indicators change throughout an individual’s life (Figure 3) and should be chosen according to the objective of the study and the health outcome.²¹ The importance of theoretically-grounded SEP measures is crucial in epidemiological studies where SEP is the exposure of interest or a confounder.

Figure 3
Indicators measuring life course socioeconomic position on an individual basis. Adapted from Galobardes et al.21 and Thomson et al.19

There is an inverse relationship between SEP and periodontitis regardless of the measure of periodontitis.²² SEP indicators are frequently represented by a) Education; b) Housing tenure, conditions, and amenities; c) Income; d) Occupation; e) Proxy indicators; f) Wealth; g) Working life indicators and exclusion from the labor market; h) Composite indicators; i) Indices of deprivation, and j) Life course socioeconomic position.²¹ Particularly, education and income are strongly linked to health at both individual and population levels. To further elucidate how education is related to health, a conceptual framework had been proposed at the Organization for Economic Co-operation and Development (OECD) symposium,²³ taking into consideration a wide range of concepts and interpretations (Figure 4).

Figure 4
How education affects an individual’s life in all contexts and levels, including lifestyles that can positively or negatively influence health. Adapted from Feinstein et al.23

Health literacy

Education is a common SEP indicator in periodontal research, assessed as a continuous (years of completed education) or categorical variable (e.g. complete high school). There is a dose-response relationship between education and periodontitis.²² A comprehensive theoretical model evaluating how education shapes health literacy was proposed (Figure 5). Attempts to encourage knowledge transfer from healthcare professionals to patients can be ineffective if the patients have low formal education levels. However, as healthcare moves toward a patient-centered approach with shared responsibilities, health education becomes even more relevant. Currently, patients with low health literacy skills and difficulties with reading, writing, and numeracy face tremendous limitations to assimilate healthcare information through electronic technology.²⁴

Figure 5
Relation between health literacy and periodontal outcomes. Adapted from Holtzman et al.27

The term health literacy was introduced in the 1970s and according to the World Health Organization refers to “The cognitive and social skills which determine the motivation and ability of individuals to gain access to understand and use information in ways which promote and maintain good health”.²⁵ The importance of health literacy increased throughout the last decades. More recently, the importance of moving from an individual-centered approach to a new one where demands of health systems interact with individuals’ skills has been recognized.²⁶

Health literacy is limited to an individual’s capacities, while population health literacy is extended outside these borders.²⁵ According to individual skills, health literacy can be classified in groups that range from basic skills (e.g. those related to daily life situations, such as reading and writing) to more advanced cognitive skills. If health literacy skills enhance autonomy and empowerment, health-related decision-making is also improved. Therefore, improving health literacy reduces healthcare costs, increases health knowledge, decreases hospital stay, and reduces the use of healthcare services. It is also relevant to considerer antecedents like demographic, psychosocial, and cultural factors, including education.²⁶

A theoretical framework has been proposed to explain the association between health literacy and periodontal outcomes (Figure 5).²⁷ A systematic review found an inverse relationship between number of teeth and clinical attachment loss and oral health literacy. However, the association between the latter and deep periodontal pockets, bleeding on probing, severity of periodontal disease, and dental plaque was unclear.²⁸

Interestingly, the association between oral health literacy (OHL) and periodontal parameters depends on the OHL measurement tools used.²⁷ Additionally, the association between OHL and periodontal parameters has been supported by few studies that recruited patients seeking dental care. Thus, further studies involving larger and representative samples of the general population are needed.

Behavioral change interventions

The effectiveness of periodontal disease prevention largely depends on modifications of behavior, knowledge, health literacy, patient empowerment, motivation, and compliance. Overall, there is inadequate knowledge, attitudes, and practices related to periodontal disease prevention. Therefore, behavioral factors are key concerns to prevent periodontal diseases.¹⁸

Promoting behavioral and lifestyle changes to reduce risk factors and optimize long-term adherence to professional advice is essential in the prevention and management of chronic conditions, including periodontal diseases.²⁹ Previous systematic reviews drew cautious conclusions that interventions based on psychological theories aiming to change behaviors provided better results than nontheory-based or simple educational interventions.²⁹,³⁰ There is some evidence that oral hygiene in patients with periodontal diseases may be improved by oral health education based on behavioral interventions and motivational interviewing.¹⁸

There are different interventions based on different psychological theories and behavioral models.¹⁸,³¹ These interventions are based on the assumption that many psychological factors (e.g. oral health beliefs, locus of control, sense of coherence, self-efficacy, dental anxiety) are related to oral health behaviors (e.g. compliance with and adherence to professional advice and regular maintenance dental visits).³¹ However, the lack of a single unifying psychological framework related to behavioral changes limits possible conclusions on the effectiveness of these interventions, as well as recommendations for their use at individual or population levels.³²

A comprehensive framework focusing on the nature of the intervention and behavioral constructs necessary to encourage behavioral changes suggests that the interventions should target one of the following elements: a) capability (physical and psychological skills to perform the behavior); b) opportunity (physical and social environment supporting the new behavior; c) motivation (conscious and automatic processes underlying the occurrence of the behavior) (Figure 6).³³ Based on the analysis of which element is currently deficient, this model can provide a “behavioral diagnosis” and identify the nature of the intervention needed at the individual level (e.g. education, persuasion, training, coercion, and modeling) and at the population level, within a broader social and environmental setting (e.g. service provision, social planning, health strategies, fiscal measures, and legislation).³²

Figure 6
Behavior constructs framework based on Behavioral models for periodontal health and disease. Adapted from Newton and Asimakopoulou.32

Approaches based on a three-component intervention: a) goal setting; b) planning the behavior change; c) monitoring the behavior (either by the individuals themselves or by a healthcare professional providing feedback) are effective in improving personal oral hygiene in periodontal patients.³²,³⁴ Evidence also suggests that this approach can be used in primary care settings.³⁵

The commonly used information-giving approach to behavioral change in dental practice presents little effect on sustainable gain of dental knowledge or self-efficacy beliefs. Another approach to behavioral change and motivation improvement is motivational interviewing. It is a collaborative goal-oriented communication method focused on the language of change, aiming to strengthen personal motivation and commitment to a specific goal.³¹,³⁶ A systematic overview on the effectiveness of motivational interviewing about different health problems and diseases demonstrated effective results in stopping or preventing unhealthy lifestyle behaviors, such as smoking, alcohol consumption, and substance abuse.³⁶ Interventions based on motivational interviewing in periodontal clinical settings provided less consistent effectiveness. This may result from either poor operationalization of the intervention by dental professionals or genuine failure of the approach.³²

Current evidence indicates that behavioral interventions based on cognitive constructs and motivational interviewing principles have a positive impact on an individual’s behavioral changes that may result in additional benefits to the standard periodontal treatment and oral hygiene reinforcement. However, no significant clinical benefits for the reduction of dental plaque and gingival bleeding over time have been observed.³¹

The use of mobile technologies to orientate and improve health outcomes is known as mobile health (mHealth).³⁷ It is described as individual and public health practices supported by mobile devices that can facilitate communication and patient education, management, and monitoring. Therefore, they can improve motivation, compliance, and health self-care knowledge.³⁷,³⁸ Compared to traditional approaches, interactive multimedia and visually attractive materials are more appropriate to communicate with and motivate patients. Text messages can provide warnings, reminders, reinforcements, and feedback, which are important factors to promote behavioral changes and health literacy.³⁸

Findings from a recent meta-analysis indicate improved oral hygiene and significant reduction in dental plaque and gingival bleeding among individuals receiving mHealth strategies, with better results among adolescents. Text messages and mobile applications can enhance daily self-performed oral hygiene and increase oral health literacy. Notwithstanding the promising benefits of mHealth in self-care, the effectiveness of mHealth is still considered modest.³⁸

Evidence of the effectiveness of other communication methods, such as self-inspection and videotapes, to improve oral hygiene is also unclear. Overall, possible advantages of one psychological intervention over another are yet difficult to establish.³¹

Conclusions

1. Patient-centered preventive models are more effective than professional-centered models in the management of periodontal diseases;

2. There is enough evidence supporting the mechanical and chemical biofilm control as part of preventive measures in periodontal diseases;

3. Effective periodontal care requires comprehensive preventive approaches both at individual and population levels, including the common risk factor approach;

4. The prevention of periodontal diseases requires the improvement of knowledge, better health literacy, patient empowerment, motivation, and compliance.

Acknowledgments

The authors are grateful to Dr. Marcelo W. B. Araujo, who shared new perspectives and insights that improved the manuscript.

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Publication Dates

• Publication in this collection
  24 Sept 2021
• Date of issue
  2021

History

• Received
  12 Mar 2021
• Accepted
  31 Mar 2021
• Reviewed
  15 Apr 2021