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Evaluation of the influence of malocclusion in interpersonal relations among adolescents

Aim: To evaluate the influence of malocclusion on interpersonal relationships among adolescents. Method: A cross-sectional, quantitative study was carried out with 360 students. Photographs of male and female mouth with malocclusions were manipulated and superimposed on the smile images of two individuals of both genders with normal occlusion (corresponding to the control group, GC) respectively, for assembly of 4 malocclusions: (1) anterior open bite, ( 2) anterior crossbite (3) dental crowding , and (4) Class II, in this order. These images were provided to the participants, who evaluated them through a questionnaire. Results: The less attractive malocclusion was dental crowding. For both flirting and maintaining a serious relationship the previous open bite was the most rejected, with Class II being the most acceptable. Conclusion: For adolescents, dental crowding is the most appropriate malocclusion to be corrected orthodontically. Malocclusions negatively influence the development of interpersonal relationships among adolescents. RESUMO


O R I G I N A L A R T I C L E
Evaluation of the influence of malocclusion in interpersonal relations among adolescents INTRODUCTION M alocclusion, defined as a change in growth and development affecting tooth occlusion, is considered a public health problem, since it presents a high prevalence and can negatively interfere in the quality of life, impairing the social interaction and the psychological wellbeing of individuals affected [1,2,3].
It presents multifactorial origin, hardly being attributed a single specific cause. It can be caused by general factors such as: congenital, hereditary, nutritional deficiencies or by local factors such as: supernumerary teeth, dental caries and early loss of deciduous teeth [4].
The assessment of occlusion considering public health aspects aims to determine the need and priority of treatment and to obtain information to adequately plan the resources needed to provide orthodontic treatment to the population [3,5].
Most of the articles studied in the age group of 12 to 17 years showed that malocclusion in permanent dentition causes impact on quality of life, since adolescents with malocclusion without orthodontic treatment were more likely to have physical, psychological and social impacts [6,7]. In this context, the main factors influencing the decision for orthodontic treatment from the patient's point of view are: dissatisfaction with facial appearance, dentist's recommendation, parental concern and influence of school colleagues using orthodontic appliance [8,9,10].
At the beginning of adolescence, school, community and friends groups influence personal behaviors and values during the period of self-esteem formation [11].
In this way, those with any malocclusion will probably face difficulties in acceptance and social interaction due to aesthetic reasons. In more severe cases, they result in functional and emotional limitations, especially during adolescence, a phase in which social and affective interactions are more intense [12,13].
Malocclusion may present physical, psychological and social effects in individuals.
It affects the smile, fundamental part of the facial appearance and the expression of the emotions [14]. Dental aesthetics have a direct effect on quality of life, mainly related to social acceptance [3,15,16].
Based on this context the objective of this research was to investigate if the malocclusions interfere in the interpersonal relations between the adolescents.

METHOD
This was a cross-sectional and quantitative study carried out after the approval of the Research Ethics Committee of the State Universality of Piauí-CEP / UESPI, opinion number: 65108317.1.0000.5209.
The sample calculation was based on the target population: teenagers from the city of Parnaíba, attending high school in 13 state public schools, choosen by lot, in 2017, totaling 6.240 students. The sample size calculation was based on the target audience: adolescent students from the city of Parnaíba, PI, attending high school in public schools in 2017. Thus, in order to successfully achieve the objective of the present study, it was based on the survey by the Brazilian Institute of Geography and Statistics, which estimates an estimated 15.000 people in the target population: adolescents living in the city of Parnaíba-Pi aged 15 to 18 years. From this, the sample size formula was performed, resulting in a number of 365, but 5 did not want to participate in the study.
This minimum number of participants is considered sufficient considering the proposed analyzes, the 5% sampling error, and 95% confidence level, indicating that the probability of the mistake made by the research does not exceed 5% [17].
The tests were applied with 360 high school students, with 120 students for each series (1st, 2nd and 3rd years), corresponding to 60 male students and 60 female students.
The inclusion criteria were adolescents who were attending high school in state schools, who accepted to participate in the study. Students were randomly chosen by lot. As an exclusion criterion, students who did not attend high school in those schools, those who were unable to understand and respond to the questionnaires, such as those with cognitive deficits, syndromes or hearing impairment, visual or those who did not wish to participate in the research.
The study had as its principle the ethical foundation and the norms contained in Res. Oral photographs of both genders with malocclusions were digitally manipulated by the Adobe Photoshop program (Adobe, San Jose, Calif., Inc.) and superimposed on the CG smile photos respectively for the assembly of 4 malocclusions: (1) anterior open bite (2) anterior crossbite (3) anterior dental crowding and (4) Class II, in this order. The modifications were only dental in the CG so that the faces remained unchanged. Eight images of these 4 malocclusions were obtained, 4 images of male mouths and 4 images of female mouths, which were superimposed on the smile images of the two young men who served as CG, respectively.
The sample was divided equally for better comparison between genders. For the male participants, the female images were presented, both the manipulated images, corresponding to the four malocclusions and the CG. Similarly, for female students, male images were presented, both manipulated and CG images.
Then the test was applied with 5 questions: (1) At a party, does a person with this kind of smile attract you? (2) Would you start an intentional conversation with a person with this kind of smile? (3) Would you flirt with a person with this kind of smile? (4) Would you start a lasting relationship with a person with this smile? (5) Would you suggest orthodontic treatment to make the smile more harmonious?
They responded the test using the Likert scale, which had five options: "I fully agree" (certain about the answer -with a score of 5 points), "I agree partially" (I'm not sure -4 point) , "I completely disagree", (showing negative certainty -with a value of 1 point), "I partially disagree" (partial negative certainty, doubt -with a value of 2 points) and "I do not agree or disagree" (the teenager interviewed did not express opinion on the subject -with a value of 3 points) (Figure 3).   The two researchers were previously calibrated at the Clinical School of Dentistry (CSD) of the State University of Piauí, to determine the time of visualization of the images and the level of difficulty of the interview. For calibration, we used oral images with the smile of 20 adolescents with malocclusions and 4 images of normal occlusion [18].
Subsequently, the pilot study involving 45 students who did not participate in the research was carried out with the objective of testing the proposed methodology. As a result, their viability was observed, without adjustments. In order to assess intra-and inter-examiner reproducibility, 10% of the total sample was examined twice by each of the examiners, with the Kappa coefficient for inter and intra-examiner agreement being 0.79 and 0.85, respectively.
The rules for the analysis of the photographs and answers to the questionnaire were previously explained, so that there would be no doubts.
The photos were displayed on the 14inch computer placed at a distance of 30 cm from the evaluator, and they were altered by Each photograph was individually exposed on a Power Point slide page.
Then the CG image was visualized for 1 minute, and the questionnaire was answered within 2 minutes at most without displaying the image again. Subsequently, the images of the malocclusions were evaluated in this order: anterior open bite, anterior crossbite, anterior dental crowding and Class II, with no right to return to the previous image, totaling 15 minutes for each participant (3 minutes for visualization of each image and corresponding to the CG interview and the four malocclusions of the research), totaling 5 images and 5 questionnaires for each research participant [19]. The order of presentation of the images was determined by lot.
Using the statistical package in version 21, from the results of the descriptive analysis of the means, followed by the Chi-square test with repeated measures, we observed which images interfered in the interpersonal relations, specifically, attraction, intentional conversation, flirtation, relationship serious and suggestive for the beginning of an orthodontic treatment.

RESULTS
The average age of the sample was 16.7(± 1.3). In Table 1, the means of the responses according to the Likert scale and application of the Chi-square test were presented with respect to the interest according to the type of smile.
Regarding all the questions that were applied, there were significant differences (p < .001) between the CG photos (with normal occlusion) and the malocclusion photos. All malocclusions had a negative impact on the individuals' acceptance for relationship purposes when compared to the CG image.

DISCUSSION
According to the literature, there is a strong relationship between physical appearance and social attractiveness. The concept "what is beautiful is good" makes attractive people obtain social benefits attributable to their appearance, due to the existence of physical stereotypes [20]. Generally, individuals with attractive physical and / or facial characteristics cause positive expectation and impression, gaining advantages in interpersonal relations [21].
The present study corroborated the findings of Pithon et al. [19] and Beall [22] when affirming that among the types of malocclusions, the dental crowding was what most reduced the attractiveness of the smile (Figure 4). According to a research on the differences in attractiveness comparing modifications of the female profile of Class II malocclusion by Yüksel et al. [23], the image of a woman with a Class II profile was judged to be significantly less attractive.
In this study, the adolescents answered preferred to maintain an intentional conversation with CG and people with Class II malocclusion ( Figure 5), probably because they find this malocclusion more attractive than the others. In the study by Pithon et al. [24] they stated that individuals with Class II malocclusion are more sociable after undergoing orthognathic surgery.   This work demonstrated that both to flirt and to maintain a lasting relationship the adolescents preferred those who presented Class II malocclusion, being the most attractive, when compared to the other malocclusions analysed (Figures 6 and 7). However, in Beall's research [22], this malocclusion has a strong impact on the perception of facial attractiveness, with straight facial profiles being considered more attractive than those with mandibular retrusion combined with maxillary protrusion. Naini et al. [25] also found that Class II patients had significantly reduced attractiveness ratings and had a greater desire for orthognathic surgery.
The authors observed that both to flirt and to maintain a lasting relationship the image of person with open bite aroused less interest on the part of the adolescent ( Figures  6 and 7). Similar situation had also been observed by Scapini et al. [12], Claudino et al. [13], and Ocampo-Parra et al. [26]   who evidenced that in the presence of this malocclusion, people have difficulty initiating, maintaining and closing a conversation in an effective way. Such situation would facilitate the development of lasting relationships, as well as being necessary in several everyday interpersonal contexts.
The anterior dental crowding was the type of malocclusion, whose adolescents involved in the research would most likely suggest the orthodontic treatment (Figure 8), corroborating the research by Pithon et al. [19], who found that although malocclusions have a negative impact on the individuals' acceptance, when a lasting relationship was initiated, dental crowding was the malocclusion that would most motivate them to suggest the orthodontic treatment. This finding had also been reported by Oliveira and Sheiham [3], emphasizing the strong concern of teenagers with the alignment of their teeth. This research elucidated that malocclusions negatively influence the development of relationships among teenagers, since individuals with good occlusion are more accepted from the perspective of affective life. Pithon et al. [27] have shown that facial appearance plays an important role in judging personal attractiveness and also in developing self-esteem, overcoming even functional issues. Including Oliveira et al. [28] in a review study on occlusal issues, they observed that oral alterations had a reportedly negative impact on the quality of life of adolescents.

CONCLUSION
People with anterior dental crowding aroused less attration among adolescents, who participated in this research.
To maintain an intentional conversation, the adolescents in the study prefer people with Class II malocclusion.
For both flirting and maintaining a serious relationship the previous open bite was the most rejected, with Class II being the most acceptable.
For adolescents, dental crowding is the most appropriate malocclusion to be corrected orthodontically.
Malocclusions negatively influence the development of interpersonal relationships among adolescents.