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Year : 2021  |  Volume : 13  |  Issue : 5  |  Page : 501-505  

Prevalence of bruxism among the students of gulf medical university: A cross-sectional questionnaire study

1 Interns, Gulf Medical University, Ajman, UAE
2 Diagnostic and Surgical Dental Sciences Department, Gulf Medical University, UAE

Date of Submission04-Oct-2020
Date of Decision12-Oct-2020
Date of Acceptance30-Nov-2020
Date of Web Publication05-Jun-2021

Correspondence Address:
Anam Hussain
Dental Intern, Gulf Medical University, Ajman
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jpbs.JPBS_644_20

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Introduction: Bruxism is a multifactorial phenomenon that involves grinding or clenching of teeth. The parafunctional habit includes abnormal tooth wear, tooth fracture, pain, and tooth mobility, along with headaches and facial muscle hypertrophy. It is imperative for students to be conscious of teeth grinding along with its possible causes. The student will be alert to visit the dentist if required and contribute to the recognition of etiological factors, to eliminate them. Objective: This study aims to find the prevalence and understanding of bruxism among Gulf Medical University (GMU) students. Materials and Methods: A cross-sectional, questionnaire-based study was conducted among 451 GMU students. The parameters for data collection were age, gender, prevalence, associated signs and symptoms, causes, genetic predisposition, time of day, and effect on the appearance of teeth. Results: While 35.9% were unaware, 41.7% of our samples reported bruxism. The majority recognized temporomandibular joint and facial pain as causative, and 24.8% reported symptoms. Headache (26.4%) was prime and 7.5% were associated with fracture and abnormal tooth wear to bruxism (38.1%) experienced night bruxism. A significant number of students (32.4%) identified abnormal anterior teeth relationship as the cause and (64.3%) associated bruxism and esthetics. Conclusion: Nearly 41.7% of the students reported bruxism. Around 35.9% of the samples were uninformed. Nearly 20.8% believed that bruxism had genetic relevance. Nearly 51.9% of the participants were asymptomatic. Around 38.1% had night bruxism and 32.4% identified abnormal anterior teeth relationship as the cause. The majority of the sample (64.3%) connected bruxism to negative effects on teeth and esthetics.

Keywords: Bruxism, clenching, etiological factors, prevalence

How to cite this article:
Hussain A, Rizvi M, Vohra U, Kohli K, Asim S, Fikree M, Ovais Z, Ahmed SA. Prevalence of bruxism among the students of gulf medical university: A cross-sectional questionnaire study. J Pharm Bioall Sci 2021;13, Suppl S1:501-5

How to cite this URL:
Hussain A, Rizvi M, Vohra U, Kohli K, Asim S, Fikree M, Ovais Z, Ahmed SA. Prevalence of bruxism among the students of gulf medical university: A cross-sectional questionnaire study. J Pharm Bioall Sci [serial online] 2021 [cited 2022 Nov 29];13, Suppl S1:501-5. Available from:

   Introduction Top

Bruxism is a multifactorial phenomenon involving subconscious grinding or clenching of teeth, originating from a Greek term “brychein” which means “gnashing.”[1]

Dentists acknowledge bruxism as it results in abnormal tooth wear, fracture and mobility, pain, headaches, facial muscle hypertrophy, and occasionally temporomandibular joint disorders (TMDs).[2],[3]

General malocclusion previously included bruxism; however, its etiology involves:[4] sleeping disorders such as obstructive sleep apnea. It is the highest risk factor as it influences the motor neurons during sleep. Electromyograph detects bruxism by collecting electric signals while chewing. The activation of the central mechanism of the brain causes conscious clenching, whereas semiconscious conditions such as hypnagogic/hypnopompic hallucinations are reported in bruxers.[5],[6]

A study of 148 parents concludes that 32.4% of children, aged 3–12 years, have no correlation of bruxism and gender.[7] In a cross-sectional study at Children's Hospital Boston Dental Clinic, the average age was 8.1 years, wherein 52% were female bruxers. According to the National Sleep Foundation, 8% of adults and 14%–20% of 11-year olds have sleep bruxism.[8] To diagnose bruxism, teeth grinding, sore jaw muscles, transient cerebral pain, mobility, attrition, and recession are significant. Common causes of bruxism are aggressive toothbrushing, acidic drinks, and tough foods.[9] Patients who are competitive, aggressive, or hyperactive are prone to bruxism. There is an interrelationship between marital status and bruxism wherein divorcees and widowers have a greater prevalence.[10]

In Manfredini and Landi study of 160 participants, 41.8% had bruxism due to the imbalance between centric occlusion and centric relation; however, there is no evidence.[11]

The primary cause of bruxism is the central dysregulation of direct and indirect paths of the basal ganglia. Patients with Alzheimer's disease, Parkinson's disease, and other frontal lobe dysfunctions have bruxism according to Kwak et al.[12],[13] According to Fernandes et al., there is a stronger correlation between chronic migraine and bruxism compared to TMD.[14] Sleep bruxism is associated with morning headaches; however, the impact is uncertain.[15]

Psychosocial factors such as stress initiate the development of bruxism; therefore, bruxers should incorporate meditation. Psychological counseling and modifying daily habits, such as chewing gum, can prevent bruxism.[16]

Caffeine, alcohol, or drugs (such as amphetamines, L-dopa, and selective serotonin reuptake inhibitors) induce bruxism.[17]

The management of bruxism is undermined. To relieve discomfort or damage to the tooth, medications (benzodiazepam) or dental therapy is used. However, Botox injections are more effective. In addition, sleep bruxers are advised to use appliances such as braces, occlusal splints, and mouthguard.[18]

Bruxism has short- and long-term effects. Short-term effects include headaches, which is most common, trismus and otalgia, which predispose to TMD.[19]

The correlation between bruxism and trismus compromises the facial musculature.[20] The long-term effects include attrition or TMD; however, it is an inconsistent marker. TMD patients have pain and trismus, causing locking and thumping joint sounds.[21] If bruxism is left untreated, it results in gum recession, headache, TMD, and tooth mobility.[22]

Bruxism is multifactorial due to several etiologies such as genetics, psychosocial factors, and medications. Its management includes occlusal appliances and interventions and pharmacological approaches.[22] The aim of this study is to find the prevalence and risk factors of bruxism among Gulf Medical University (GMU) students.

   Materials and Methods Top

A cross-sectional study design was used. The sample size was 451 students at GMU. Research protocol was approved by the GMU Institution Research Board, and ethical committee report approval of proposal was on December 6, 2017, before data collection. The students were addressed in groups, and a brief description of the study and its purpose was explained to them. Final data collection was done and then fed to Google Forms and then exported to Google Sheets for data comparison and analysis.

   Results Top

Our research team targeted 451 students. The questionnaire form was read and consented to. Three hundred and forty-three were females, among which 198 (57.7%) reported no bruxism and 145 (42.3%) reported experiencing bruxism. Sixty-five (60.2%) of 108 males reported no bruxism, showing no significant relationship of bruxism to gender using Chi-square test. The majority of our respondents (41.7%) were aged 18–19, followed by the ages 20–21 years (39%). The next age group, 22-23, comprised (11.5%) of the study population. Ages 16-17 make 4.9% and age 24 above made up 2.9% of the population. Interestingly, 35.9% of the participants were unaware of bruxism, while 64.1% had previous knowledge [Figure 1].
Figure 1: Knowledge about bruxism

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Regarding bruxism and genetic predisposition, 357 (79.2%) participants dismissed any association, whereas 94 (20.8%) of the samples identified a correlation between the two. When asked about the associated signs and symptoms, around 51.9% chose none and 26.4% associated headaches with bruxism. Nearly 24.8% reported experiencing facial and temporomandibular joint pain. About 19.7% disclosed tooth sensitivity, 10.6% listed persistent toothache, 10.4% reported sore and inflamed gums, and 7.5% chose fracture, abnormal tooth wear, and gum recession with tooth mobility as illustrated by the bar graph in [Figure 2]. Participants experiencing bruxism responded differently. When asked about the time of day at which their habit occurred, “night time” had the greatest percentage (38.1), followed by “mid-day” with 27.3%. “Morning,” “afternoon,” “evening,” and “none” came to 21.5%, 17.1%, 20.6%, and 20.8%, respectively, illustrated in [Figure 3].
Figure 2: Discomfort accompany bruxism

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Figure 3: Day time of bruxism

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In perceiving the cause of bruxism, among 451 responses, only (2.20%) students blamed the loss of posterior teeth and abnormal anterior teeth. Nearly 4.0% of students believed that posterior teeth and abnormal posterior teeth relationship is the reason behind bruxism. Around 8.4% of students chose abnormal anterior and posterior teeth relationship as the cause. Nearly 10% of students associated all three factors to bruxism. In addition, 12% of the respondents believed bruxism resulted from the loss of the posterior teeth. Around 31% of the students chose abnormal posterior teeth relationship to be the cause of bruxism, and 32.4% identified abnormal anterior teeth relationship as the causative factor [Figure 4].
Figure 4: Cause of bruxism

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Upon inquiring about opinions on the effect of bruxism on the overall appearance of teeth, 290 (64.3%) replied with a “Yes,” inferring that the dentition may be negatively affected. One hundred and sixty-one (35.7%) responded with “No.” These negative responses suggested that the students doubted the effect of bruxism on the overall appearance of teeth. This is demonstrated in [Figure 5].
Figure 5: Effect of bruxism evident on teeth

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   Discussion Top

Bruxism is a parafunctional activity that is characterized by clenching and grinding of teeth.

Our research was conducted on 451 medical students. The sample consisted of students aged from 17 to 24 and above within the university. The result demonstrated that there was no significant difference between age groups concerning the prevalence of bruxism. This result was in agreement with a study conducted on 183 Brazilian medical students, conducted by Serra-Negra et al.[23] Both studies concluded that the manifestation of the habit was found to be in a much higher prevalence among the younger students than in the older ones.[23]

In our study, the female participants were more than males. A study was conducted on the prevalence of bruxism in undergraduate students at the Federal University of Brazil by Olga Flecha and Karine Tais. Their sample size was 253 students, involving 106 males and 147 females. Their results showed that females of the sample population had a higher incidence of bruxism than males, which were compatible with the results of our study.[24]

In regards to the relation between bruxism and headaches, out of 451 participants, 321 (71.2%) believe that bruxism does cause headache. However, only 119 (26.4%) of the sample population experienced headaches that are associated with bruxism. Patients with sleep bruxism, associated with factors such as teeth grinding, pain, and attrition of teeth, as well as bitemporal headaches in the morning.[25]

In comparison with a study done by Vierola et al., a research was done in the University of Finland, correlating bruxism and headache among 439 children. About 31% of the children reported experiencing headache for the past 3 months, out of which 17% of the sample size experienced headache during the morning. According to the study, we conducted, about 21.5% of the sample population, which is 97 students out of 451, experienced headache in the morning.[26]

In 2013, the University of Sao Paulo conducted a study by de Siqueira et al. to investigate the main etiology of headache in Brazilian citizens. Around 48.6% of the adults and 58.7% of the elders experienced discomforts, of which 55.5% were due to headache that is caused by bruxism. However, headache was more prevalent in bruxing adults than elders.[27]

A study was held by the University of Helsinki, Finland, on five birth cohorts' pairs of twins between the ages of 23 and 27 based on dominant genetic effects and additive genetic effects. It was noted that genetic effects do contribute to half the substantial proportion for the liability of bruxism.[28]

   Conclusion Top

Although the etiology of bruxism is not identified completely, 41.7% of GMU students reported to either having or knowing someone with the habit of bruxism. There was no significant relationship found between bruxism with either age or gender. Only 35.9% of the samples had a background knowledge about bruxism and only 20.8% believed that bruxism had a genetic relevance. Nearly 51.9% of the participants reported that they had bruxism but did not present any signs or symptoms, whereas the highest percentage (26.4%) reported headache. Night bruxism was reported by 38.1% of the participants. Regarding the causes of bruxism, 31% of the participants reported abnormal posterior teeth relationship as the causative factor for tooth grinding, whereas 32.4% reported abnormal anterior teeth relationship. Nearly 12% of the reported bruxism was attributed to the loss of posterior teeth. The majority (64.3%) of the participants believed that bruxism had a negative effect on teeth and esthetic. There is no exact treatment for bruxism, but various habits can be developed or modified. In most cases, prevention of bruxism may come to be more important and beneficial than its treatment as, once initiated, bruxism might not be identified until it causes a significant amount of damage to the dentition.

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Conflicts of interest

There are no conflicts of interest.

   References Top

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[PUBMED]  [Full text]  
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  [Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5]


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