A bacterial infection is the most prevalent cause of gingivitis, an inflammatory disorder of the gingival tissue or the gums. It is gingival inflammation with the connective tissue connection to the tooth remaining at its previous level, i.e., without attachment loss. Only the connective tissue and soft tissue of the gingival epithelium are affected by the illness. Gingivitis is regarded as the most prevalent periodontal disease. Based on the clinical symptoms, length of the infection, severity, and cause; there are many types of gingivitis [1].

Etiology

Five different forms of gingivitis can be distinguished based on the etiology.

Plaque Induced Gingivitis

Dental plaque biofilm-induced gingivitis is the most typical cause of the disease. It is described at the site level as "an inflammatory lesion resulting from interactions between the dental plaque biofilm and the host's immune-inflammatory response, which remains contained within the gingiva and does not extend to the periodontal attachment" (cementum, periodontal ligament and alveolar bone).By lowering dental plaque levels at and apical to the gingival margin, such inflammation can be reversed because it is restricted to the gingiva and does not expand beyond the mucogingival junction. Gingivitis can be further divided into the following categories based on whether dental plaque biofilm-induced gingival inflammation happens on an intact or decreased periodontium, or in a patient with periodontitis:

A decreased periodontium with gingivitis in a non-periodontitis or gingivitis on an intact periodontium patient (e.g., recession, crown lengthening) (e.g., recession, crown lengthening)A patient with well treated periodontitis has gingival irritation on a decreased periodontium (Note that recurrent periodontitis cannot be ruled out in this case)[2-3].

Infectious Gingivitis

Any other illness in the oral cavity, including dental caries, might cause this type of gingivitis. Plasma cells may infiltrate the gingiva as a result of an allergic hypersensitivity reaction, leading to plasma cell gingivitis. Chewing gum, specific toothpaste ingredients, cinnamon, mint, red pepper, and other ingredients can all be allergens. Additionally, low-grade injuries to the surrounding tissues, such as fractured teeth, overhanging restorations, overextended denture flanges, and defective fixed dental prostheses with subpar pontic design (saddle pontic) or excessively contoured borders, can result in infectious gingivitis [4].

Nutritional Gingivitis

This could happen as a result of vitamin C insufficiency. It has been discovered that the inflammatory process can be aided by the modern lifestyle, which includes consuming more refined carbohydrates and having a higher ratio of omega-6 to omega-3 fatty acids [4]. The activation of NFkB and oxidative stress are the mechanisms by which carbohydrates with a high glycemic index encourage the inflammatory process [5].

Hormonal Gingivitis

This type of gingivitis develops as a result of steroids, puberty, or pregnancy. The literature has shown that there is a rise in the amount of circulating female sex hormones during pregnancy, which is what causes pregnancy gingivitis [6]. Even without the presence of plaque, gingival inflammation develops during adolescence. Puberty gingivitis is the medical term for this. It has been discovered that estrogen and testosterone receptors with high affinities for both hormones are present in the cytoplasm of gingival cells.This form of gingivitis occurs during pregnancy, puberty, or steroid therapy. It has been documented in the literature that in pregnancy, there is an increase in the level of circulating female sex hormones that are responsible for causing pregnancy gingivitis [7]. In puberty, gingival inflammation occurs even without the presence of plaque. This is referred to as puberty gingivitis. It has been found that in the cytoplasm of the cells of the gingiva, receptors for both estrogens and testosterone that have a high affinity for these hormones are present.In particular, the basal and spinous layers of the epithelium have estrogen receptors.The basal and spinous layers of the epithelium especially contain estrogen receptors. Fibroblasts and the endothelial cells of tiny arteries in connective tissue contain these receptors. Since the gingiva is a simple organ to target for these steroid hormones, gingivitis results. Gingivitis is known to manifest in females (aged eleven to thirteen) before it does in boys during adolescence (thirteen to fourteen years) [8].

Drug-Induced Gingivitis

Numerous medications, including phenytoin (used to treat epileptic seizures), calcium channel blockers (used to treat angina and high blood pressure), anticoagulants and fibrinolytic medicines, oral contraceptives, protease inhibitors, vitamin A and analogs, might result in gingivitis as a side effect. The metabolites of these medications' capacity to promote fibroblast proliferation are assumed to be the mechanism causing this gingival irritation. Collagen in particular accumulates in the extracellular matrix as a result of an imbalance between the synthesis and breakdown of the extracellular matrix.Gingivitis then develops as a result of this. In addition to this, a number of risk factors might cause gingivitis. The patient's personal habits (smoking and chewing tobacco), systemic diseases (such as diabetes), genetics (such as hereditary gingival fibromatosis), and local circumstances (such as dry mouth and crowded teeth) are among these [8].

Non-Plaque-Induced Gingival Diseases

The numerous diverse periodontal tissue reactions observed can be explained by gingival lesions that are not caused by plaque. The clinical characteristics of gingival inflammation frequently differ from those of common plaque-associated gingival disorders [9]. Bacterial, viral, and fungal infections, hereditary conditions, and mucocutaneous diseases are among the factors that contribute to non-plaque-induced gingival diseases (e.g., lichen planus). Other potential causes include medication allergies and trauma-related tooth brushing.

Morphological Differences between the Gingival Tissues of Primary and Permanent Teeth

While in the primary dentition the inflammatory lesion occupies a narrower tissue section along the gingival epithelium, it is usually located at the coronal portion of the free gingiva in the permanent dentition. the junctional epithelium of the primary toothgingiva is thicker than that of the permanent tooth. A junctional epithelium with a thicker layer may have less permeability to bacterial toxins in the epithelial structures [10]. 

Chemotherapeutic / Antimicrobial Agents

The primary home care practices of routine teeth brushing and interdental cleaning should be considered as the foundation, with chemical or antimicrobial agents that reduce plaque and gingivitis as a complement. Chemotherapeutic drugs may be beneficial for patients who are unable to manage mechanical cleaning or who are reluctant to do so. Mouthwash use, in addition to mechanical oral cleanliness, health education, and motivation, helped orthodontic patients maintain good dental health [11]. By altering the composition of plaque in a way that prevents health from deteriorating into disease, chemotherapeutic drugs may serve as adjuncts in the prevention of gingivitis [12]. An antimicrobial agent must reach the target without being diluted by saliva and then maintain a sufficient concentration without being washed away by the gingival crevicular fluid in order to be successful in the eradication or reduction and control of subgingival plaque microorganisms. Antimicrobial and antiseptic substances can effectively inhibit the buildup of supragingival plaque despite the diluting effect of saliva [12]. Chemotherapeutic drugs can be delivered by means of varnishes, toothpaste, and chewing gum.

Prevention of Periodontal Diseases

A multistage process comprising primary, secondary, and tertiary components has been described as the prevention of periodontal disorders, including gingivitis and periodontitis [13]. The notion of health promotion and protection measures is included in primary prevention, which focuses on preventing the onset of disease. These health promotion techniques include fluoridation and teaching people about mouth hygiene, with the goal of empowering them to take charge of and improve their own health. Dentistry has proven effective in several primary preventative areas in developed countries. Improvements in attitudes regarding the significance of dental hygiene and the availability of fluoridated water supplies [14-15] serve as examples of this achievement.By using early diagnosis and therapy to halt illness progression in its earliest stages, secondary disease prevention tries to reduce the effect of disease. The idea of tertiary disease prevention is centered on rehabilitating the functional constraints brought on by the disabilities experienced after severe disease, and it includes things like implants and prosthetic tooth repair [15].

Oral gingivitis is a condition that can be treated. Numerous adjuncts may help in the management of pathogenic dental plaque to stop or slow the progression of disease. To improve dental health and lessen gingivitis, however, appropriate behavioral modification is required. The key to good disease management continues to be the mechanical plaque control achieved by appropriate oral hygiene practices.

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