Prevalence of Gingival Recession and its Relationship to Past Orthodontic Treatment in Nepalese Young Adults

Several factors may play role in the development of gingival recession but not necessarily simultaneously or equally.1 The etiology of gingival recession are calculus, because of inadequate access to prophylactic dental care,3 use of hard tooth brush,4 high frenal attachment,5 position of the tooth in the arch,6 tooth movement by orthodontic force e.g. excessive proclination of incisors,7 improperly designed partial dentures,8 smoking,9 subgingival Prevalence of Gingival Recession and its Relationship to Past


INTRODUCTION
Gingival recession is characterized by apical migration of gingival margin from the cementoenamel junction.
It can be localized or generalized and associated with at least one tooth surface. 1 Gingival recession usually leads to aesthetic problem and fear of tooth loss due to progressing destruction; it may also be associated with dentine hypersensitivity and/or root caries, and cervical wear. 2 Several factors may play role in the development of gingival recession but not necessarily simultaneously or equally. 1 The etiology of gingival recession are calculus, because of inadequate access to prophylactic dental care, 3 use of hard tooth brush, 4 high frenal attachment, 5 position of the tooth in the arch, 6 tooth movement by orthodontic force e.g.excessive proclination of incisors, 7 improperly designed partial dentures, 8 smoking, 9 subgingival information to assess the epidemiology, identification of the etiological factors and to establish preventive measures.
The objectives of the study were to determine the prevalence of gingival recession in a young adult Nepalese population and to assess the relationship between brushing technique, smoking habit and past orthodontic treatment with gingival recession.

RESULT
According to the present study; gingival recession was found in 21.3% out of total participants and 0.02% among all examined teeth.The most common tooth with gingival recession was lower left central incisor followed by lower right and left premolars and upper premolars (Table 1).
Gingivitis was found in 40% and dental plaque in 20% of the total participants.Out of total participants; 37.5% had undergone orthodontic treatment in the past.Among them, 26.7% showed gingival recession compared with 18% with no past orthodontic treatment history; which was however not statistically significant (Table 2).
An association was found between severity and extent of recession to past orthodontic treatment.Only 1% patients with no past orthodontic treatment showed gingival recession of 3mm.36.7% with past orthodontic treatment showed recession of 1-2 mm compared to 17% with no orthodontic treatment.(p=0.219).Similarly, 3.3% patients with past orthodontic treatment had three or more teeth with gingival recession compared to 5% with no past orthodontic treatment.23.4% patients with past orthodontic treatment showed 1-2 teeth with gingival recession compared to only 13% with no orthodontic treatment (p=0.237)(Table 3).was not statistically significant.(p=0.581)(Table 5).There was no statistically significant association observed between gingival recession and brushing technique.

DISCUSSION
In this study, gingival recession was found in 21.3% of the total participants and 0.02% of all examined teeth.Similar results were found where prevalence of gingival recession ranged from 22.5% 14 to 27.7%; 15 however other studies showed prevalence of gingival recession ranged above 50.0%. 16,17,18e role of dental plaque accumulation and gingival inflammation in the development of gingival recession has been analyzed in previous epidemiological studies in which gingival inflammation was the most frequent precipitating etiological factor of gingival recession. 18,19In this study; 23.4% of subjects with gingivitis had gingival recession compared to 19.8% with healthy gingiva.Toker and Ozdemir 20 recorded a positive association between gingivitis and occurrence of gingival recession, however these finding was not confirmed by other similar studies. 18,21The different results suggest the role of dental plaque and gingivitis as a risk factor for gingival recession.
Mostly young patients are referred for orthodontic treatment and they often suffer from plaque related gingivitis. 22olescents have certainly been shown to suffer worse gingivitis than adults during orthodontic treatment. 23It is well known that the presence of molar bands, brackets, Dhami B, Shrestha P, Gupta S, Shrestha S, Shrestha RM : Prevalence of Gingival Recession and its Relationship to Past Orthodontic Treatment in Nepalese Young Adults

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wires and other orthodontic auxiliaries expose the patient's teeth highly susceptibility to plaque accumulation.Almost every fixed orthodontic patient develops gingival disease at some time during the treatment. 24Gingival recession has been shown to be a common adverse factor during and/ or after the orthodontic treatment.Thin, delicate tissue is far more prone to exhibit recession during orthodontic treatment than the normal or thick tissue.If a minimal zone of attached gingiva or thin tissue exists, a free gingival graft enhances the tissue around the tooth which helps to control inflammation.
This should be done before any orthodontic movement is begun. 25,26Recession has been noted more frequently while using buccal orthodontic movements.If the teeth with thin tissue are to be moved lingually, there is a potential for the tissue to move coronally and become thicker.
Tobacco smoking was associated with the occurrence of gingival recession in the present study.Past studies showed that tobacco smoking was regarded as one of the main risk factors for development of destructive forms of periodontal disease. 18,19,21It was suggested that the combination of smoking and supragingival calculus was associated with localized and generalized gingival recession, and smoking may be a risk factor for gingival recession in adults with minimal periodontal destruction. 27However, it was not supported by a study done by Muller et al 28 and explained that the smoking status was not identified as a risk factor for the development of gingival recession. 29 the present study, the prevalence of gingival recession was associated with past orthodontic treatment.There was a relationship between the prevalence, severity and extent of recession to past orthodontic treatment.Orthodontic tooth movement outside the labial or lingual alveolar plate can lead to dehiscence and gingival recession. 30However, there was no relationship found between orthodontic movement in various age groups and gingival recession. 30,31In this study, most common tooth with gingival recession was lower left central incisor.It has been shown that most cases of gingival recession which occur during an orthodontic treatment located in the regions of upper and lower anterior teeth. 32,33 this study, gingival recession in past orthodontic patient are more in between 1-2mm and in 1-2 teeth, which could be because of gingival biotype, dental plaque and inflammation around those teeth or there was occurrence of gingival recession even before starting the orthodontic treatment.
Gingival recession is a common condition and can be seen in young adults which progresses over the time and if not treated may result in tooth mobility and finally tooth loss.
Orthodontists should be aware of the etiology, prevalence, and associated factors of gingival recession, as well as treatment options, so that the appropriate treatment Any periodontal therapy that enhance the gingival biotype should be done before any orthodontic movement is begun.
It is always better to treat recession at the earlier stages.
A cross-sectional study was carried among 160 healthy patients aged 18-25 years with routine dental examinations at the Department of Periodontics, Kantipur Dental College and Hospital from March to May 2016.The study was conducted after receiving permission from Institutional Review Committee.The participants were evaluated by a single examiner to avoid inter-examiner variation.The sample included 47 male (29.4%) and 113 (70.6%) female patients.All fully erupted permanent teeth were examined on the facial aspect.Only the vertical extent of gingival recession was examined.Third molars and root stumps were excluded from the study.The examiner explained the aim of the study to the patients who agreed to sign the informed consent before clinical examination and to fill up a written questionnaire.The questionnaire consisted of information regarding age, smoking habits (number of cigarettes per day and years of smoking), oral hygiene habits, brushing technique and past orthodontic treatment.Clinical examination included visible gingival inflammation, visible dental plaque, and gingival recession on the midfacial aspect of all teeth excluding the third molars.Gingival recession was measured as the distance from the cementoenamel junction to the free gingival margin by using William's periodontal probe up to the nearest millimeter.The prevalence, extent, and severity of gingival recession were associated with past orthodontic treatment.All recorded data were statistically analyzed using SPSS version 20.Chi-square test was used to evaluate the association between the variables.The level of significance was set at p<0.05.
modalities can be offered to patients.The etiologic agents should be identified and removed as early as possible in order to avoid worsening of the clinical condition.Proper use of soft toothbrush and brushing technique should be advised to the patient.Various modalities of treating gingival recession are gingival graft (free gingival or connective tissue graft), guided tissue regeneration, restorations for the correction of sensitivity and orthodontic treatments.CONCLUSION Patients must undergo regular oral hygiene performance and periodontal maintenance in order to maintain healthy gingival tissue during active orthodontic therapy.The combined orthodontic-periodontic interdisciplinary approaches are more effective in these situations.Clinicians should schedule regular oral hygiene sessions for susceptible patients periodically during the entire duration of treatment.Pre-orthodontic assessment of the bone thickness and the thickness of overlying tissues should be performed to predict the likelihood of gingival recession post orthodontic therapy.

Table 2 : Occurrence of gingival recession in relation to orthodontic treatment
Dhami B, Shrestha P, Gupta S, Shrestha S, Shrestha RM : Prevalence of Gingival Recession and its Relationship to Past Orthodontic Treatment in Nepalese Young Adults Orthodontic Journal of Nepal, Vol. 6 No. 1, June 2016

Table 5 : Relationship of gingival recession with gingivitis
Similarly, 23.4% of patients with gingivitis had gingival recession compared to 19.8% with healthy gingiva which