Dentistry and Oral Health-Sci Forschen

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Research Article
Creating a Quality of Life Index for Patients with Temporomandibular Disorders

  Rena Nakayama      Akira Nishiyama*      Masahiko Shimada   

Orofacial Pain Management, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Japan

*Corresponding author: Akira Nishiyama, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8549, Japan, Tel: +81-3-5803-5713; Fax: +81-3-5803-5713; E-mail: anishi.tmj@tmd.ac.jp


Abstract

Objective: To create a new quality of life (QOL) questionnaire specifically for temporomandibular disorder (TMD) patients.

Materials and Methods: From April 2016 to March 2017, individuals undergoing initial examinations or treatment for TMD at our dental hospital (i.e., patient group) and individuals with no diagnosis or subjective symptoms of TMD (i.e., control group) completed self-assessed questionnaires (ethical approval no. 1285). We compared intergroup differences in the mean scores, and ranked questions by the size of the difference. We then created a novel 16-item questionnaire. Cronbach’s alpha was 0.950. Correlation of the total scores of the questionnaire with the numerical rating scale (NRS; to assess pain) and with the Hospital Anxiety and Depression Scale (HADS; to assess TMD-related psychosocial and functional disturbances) was evaluated using correlation coefficients.

Results: Participants were ≥ 20 years old. The patient group and control group comprised 103 participants and 173 participants, respectively. In both groups, the correlation coefficients for the questionnaire’s total scores with the NRS (0.6-0.8) and with the HADS showed moderate or higher correlations.

Conclusions: The questionnaire strongly correlated with the patients’ pain intensity and subjective level of disturbance and may be used as an index for TMD patients’ QOL level or therapeutic effect.

Keywords

Diagnostic criteria for temporomandibular disorders; Numerical rating scale; Oral health-related quality of life; Pain intensity; Selfassessed questionnaire


Introduction

Temporomandibular disorders (TMD) are a subclass of musculoskeletal disorders resulting from dysfunctions of the stomatognathic system that affects the masticatory muscles, temporomandibular joint, and orofacial structures [1]. Temporomandibular disorders are multifactorial and have a positive natural course and an incidence rate of approximately 5–12% [2,3]. Symptoms include pain, joint sound, and limited mouth opening, while treatments include behavioral modification, splint and pharmaceutical therapies. The goal of TMD therapy is focused on improving the symptoms rather than providing a complete cure. Therefore, the extent to which TMD symptoms affect the daily life of TMD patients’ needs to be assessed.

Most studies have been focused on evaluating the degree of mental and physical disturbances. The visual analog scale (VAS) or the numerical rating scale (NRS) is often used to assess pain. Moreover, the extent of mouth opening is used as an index that can express the disturbance caused by TMD. However, pain intensity and the extent of mouth opening do not necessarily reflect the deteriorating level of a patient’s quality of life (QOL).

Assessing patients’ QOL has recently become an important part of medical care. In TMD, a patient’s own assessment has great relative importance for whether symptoms have improved. Therefore, much research has been conducted on the QOL assessment of TMD patients [4,5].

Previous research has highlighted the need for high-quality evidence to create an outcome measure with validity and reproducibility that is focused on TMD patients [6-8]. Several scales for assessing QOL in patients with TMD have been created, based on questions from scales such as the Oral Health Impact Profile (OHIP) and the Research Diagnostic Criteria for TMD (RDC/TMD). A questionnaire’s responsiveness for assessing QOL in TMD patients can differ, depending on the patient’s country or culture [9].

Being able to properly evaluate problems especially for TMD patients would allow medical professionals to assess their patients’ conditions (severity, reduced QOL, etc.). Sugisaki et al. [10] created a questionnaire on TMD pain-related limitations of daily function (LDF-TMD) in Japanese patients. The questionnaire’s 10 items were each evaluated on a five-grade scale (range, 0–40 points). However, the mean score for actual TMD patients was 13.6 [11], which indicated it cannot be used to assess the QOL of TMD patients in detail. In this situation, multiple questionnaires would need to be combined to qualitatively assess the QOL of TMD patients. However, more items for question would increase the burden on patients [12,13]. For this reason, we developed a QOL questionnaire specifically for TMD patients so that only one evaluation needs to be performed.

Materials and Method

Survey outline

A survey using a self-assessed questionnaire was administered to individuals from April 2016 to March 2017. The study participants consisted of 103 patients in the patient group and 173 individuals in the control group. All participants were 20 years old or older. The patient group comprised patients who came for initial examinations or were being treated at the Temporomandibular Joint Clinic at the Tokyo Medical and Dental University Dental Hospital (Tokyo, Japan). Patients were selected who had received a definitive diagnosis of TMD, based on the diagnostic criteria for TMD (DC/TMD) [14], and whose pain had persisted for at least 3 months. The control group comprised employees, students, and graduates of the university who had never been diagnosed with TMD and had none of its subjective symptoms. Patients were excluded if they met any of the following criteria: (1) they had a systemic disease such as rheumatism, (2) they had acute symptoms (i.e., acute inflammation of the orofacial area), or (3) they regularly used antidepressants, antianxiety agents, or psychotropic agents. After patients underwent outpatient examinations or care, an investigator explained the survey and obtained in writing their consent to participate in the study. A questionnaire was then distributed and collected after the patient completed it. For the control group, an investigator followed the same procedures as with the patient group regarding explanations and other matters. The questionnaires were administered in areas such as classrooms and laboratories, and were collected after participants completed them. No personal information was collected that could identify an individual (e.g., name, address, patient number). This study was approved by the ethical screening committee of the Faculty of Dentistry at Tokyo Medical and Dental University (approval no. 1285).

Questionnaire administered to the patient and control groups

To create a temporary questionnaire (temp-Q), questions that we judged were highly relevant to TMD patients’ QOL were selected from the OHIP, Limitations of Daily Function in TMD Questionnaire (LDFTMDQ), DC/TMD, and other questionnaires made specifically for TMD patients [4-11,13-16] (Table 1). The temp-Q followed the format of the OHIP and other existing questionnaires by using a five-point Likert scale (0=‘not at all’; 1=‘almost never’; 2=‘sometimes’; 3=‘often’; 4=‘always’). Pain intensity and limitations on daily activity due to pain were evaluated using the 11-point NRS which ranges 0–10 points. Pain intensity was assessed as the maximum pain and average pain felt over the past 1 month with 0 indicating ‘no pain’ and 10 indicating ‘the strongest pain imaginable.’ Limitations on daily activity due to pain were divided into limitations on daily life overall, on work, and on diet with 0 indicating ‘no problems’ and 10 ‘not able to do anything.’ Moreover, depression and anxiety were assessed using the HADS.

No

Item

Q1 Have you had difficulty talking for a long time, including talking on phone?
Q2 Have you had difficulty opening your mouth when eating big pieces of foods such as a hamburger or sushi?
Q3 Have you had difficulty grinding thin foods such as seaweed or lettuce?
Q4 Have you had difficulty clenching teeth when participating in sports?
Q5 Have you had difficulty brushing your back teeth?
Q6 Have you had difficulty yawning?
Q7 Have you experienced orofacial jaw muscle fatigue or pain when you are awake?
Q8 Have you had difficulty in performing your daily activity at home, work or school?
Q9 Have you had difficulty falling asleep at night?
Q10 Have you had difficulty sleeping through the night without waking up?
Q11 Have you had to interrupt meals?
Q12 Have you had difficulty chewing any foods?
Q13 Have you had to avoid eating some kinds of foods?
Q14 Have you had headaches?
Q15 Have you felt anxious and troubled?
Q16 Have you felt tense?
Q17 Have you found it difficult to relax?
Q18 Have you been upset?
Q19 Have you been self-conscious?
Q20 Has your concentration been affected?
Q21 Has your jaw pain made you feel miserable?
Q22 Have you felt depressed?
Q23 Have you had sore spots in your mouth?
Q24 Have you had sensitive teeth (for example, because of hot or cold foods or drinks)?
Q25 Have you had problems with your bite?
Q26 Have you had pain during talking?
Q27 Have you felt that your dentures or crowns have not been fitting properly?
Q28 Have you allowed your upper and lower teeth to make continuous contact during work or when focusing on one thing?
Q29 Have you experienced other people pointing out that you make teeth-grinding sounds during sleep?
Q30 Have you worried or fretted at work, school or home?
Q31 Have you felt tense in a personal relationship at your work, school, or home?
Q32 Have you had stress from work, school, home, or a personal relationship?
Q33 Have you felt anxious about work, school, home, or a personal relationship?
Q34 Have you felt fatigued, even after sleeping or taking a rest?

Table 1: Temporary questionnaire (temp-Q). The participants answered the question items on a five-point numeric rating scale: 0=‘not at all’; 1=‘almost never’; 2=‘sometimes’; 3=‘often’; 4=‘always.’

For the patient group, items concerning the pathological diagnosis of TMD and pain duration were added. To exclude people at high risk of TMD from the control group, we used a screening questionnaire for TMD (SQ-TMD) [17].

Statistical analysis

We entered the obtained data into SPSS version 21.0 (IBM Japan, Tokyo, Japan) to create a database for statistical analysis. Scores for each temp-Q item were compared between the patient and control groups using the Mann–Whitney U test. Items that did not show statistically significant differences were eliminated. The mean scores for each question were calculated; differences between the patient and control groups’ mean values were determined; and the questions were ranked, based on the size of the difference. Items with differences less than 1.0 were eliminated. A final questionnaire (fin-Q) was created using the remaining items.

Factor analysis of the fin-Q was conducted (such as principal factor analysis, promax rotation) to investigate the constructs. To examine internal consistency, Cronbach’s alpha was calculated overall and for each construct (i.e., reliability analysis). Furthermore, the fin-Q total scores were calculated, and correlation coefficients between the score distribution and NRS values and HADS scores were determined. Sex differences in the fin-Q total scores were examined and correlation coefficients between the fin-Q total score and age were determined. SPSS version 21.0 (IBM Japan) was used for the statistical analysis and a value of p<0.05 indicated a statistically significant difference.

Results
Participants’ characteristics

Members of the patient and control groups who had incomplete data were excluded. Based on the SQ-TMD results, members of the control group who were assessed as having a high risk of TMD were also excluded. As a result, there were 101 people in the patient group (mean age, 50.7 ± 14.9 years; sex, 83 females and 18 males) and 131 people in the control group (mean age, 40.1 ± 13.2 years; sex, 59 females and 72 males). Based on the TMD pathological classifications in the patient group, 85 patients had arthralgia; 63 patients, myalgia; 36 patients, disk displacement with reduction; and 40 patients, disk displacement without reduction. The HADS scores were not significantly different between the groups (Table 2).

    Total Patient Control p
    N=232 N=101 N=131
Anxiety Normal 165 (71.1) 70 (69.3) 95 (72.5)   0.538
  Borderline abnormal 39 (16.8) 20 (19.8) 19 (14.5)
  Abnormal 28 (12.1) 11 (10.9) 17 (13.0)
Depression Normal 179 (77.2) 79 (78.2) 100 (76.3)   0.939
  Borderline abnormal 43 (18.5) 18 (17.8) 25 (19.1)
  Abnormal 10 (4.3) 4 (4.0) 6 (4.6)

Table 2: Hospital Anxiety and Depression Scale. The data are presented as the number (percentage)

Extraction of questions

Table 3 shows the ranking of questions in the patient and control groups. The ranking was based on differences in the mean scores (i.e., the patient group minus the control group). Questions 30–34 were excluded from the ranking table because these scores were not significantly different between the groups. Items for which the difference in the mean scores was less than 1.0 were also eliminated. Thus, 16 items were used to create the fin-Q (Table 3).

 

Mean

P minus C

 

Patient (P)

Control(C)

 

Q6* 2.26 0.10 2.16

Q12*

2.21 0.13 2.08
Q7* 2.01 0.29 1.72

Q13*

1.84 0.13 1.71

Q15*

1.91 0.21 1.70

Q16*

1.75 0.23 1.52

Q17*

1.67 0.23 1.44

Q14*

1.59 0.21 1.38

Q25*

1.95 0.61 1.34

Q22*

1.45 0.13 1.32

Q23*

1.56 0.36 1.20
Q9* 1.31 0.19 1.12

Q10*

1.45 0.33 1.12
Q3* 1.16 0.08 1.08

Q20*

1.28 0.22 1.06

Q11*

1.12 0.08 1.04
Q5 1.08 0.13 0.95
Q21 1.07 0.12 0.95
Q4 1.03 0.11 0.92
Q18 1.03 0.12 0.91
Q26 1.00 0.10 0.90
Q27 1.09 0.22 0.87
Q19 1.01 0.15 0.86
Q8 0.94 0.12 0.82
Q1 0.77 0.06 0.71
Q28 2.30 1.62 0.68
Q29 1.36 0.79 0.57
Q32 1.97 1.53 0.44
Q33 1.78 1.36 0.42
Q24 1.42 1.03 0.39
Q34 2.15 1.81 0.34
Q31 1.86 1.55 0.31
Q30 1.98 1.69 0.29
Q2 2.39 2.17 0.22

Table 3: Item ranking
*items selected for final questionnaire (fin-Q)

Assessment of the fin-Q

The fin-Q total score of the patient group was 26.5 ± 11.1 (minimum, 2; maximum, 60) and that of the control group was 3.5 ± 5.2 (minimum, 0; maximum, 25). Factor analysis divided the items into 2 complexes (Table 4). The factor loading of Question 7 was virtually the same in both complexes. When Question 7 was included in Factor 1, Cronbach’s alpha was 0.947 for Factor 1 and 0.907 for Factor 2. When Question 7 was included in Factor 2, Cronbach’s alpha was 0.946 for Factor 1 and 0.917 for Factor 2. When Question 7 was included in Factor 2, Cronbach’s alpha of Factor 1remained virtually unchanged, but Cronbach’s alpha for Factor 2 increased; therefore, we decided to include it in Factor 2. Based on this result, we defined Factor 1 as ‘psychosocial disturbance’ and Factor 2 as ‘functional disturbance.’ Cronbach’s alpha for all 16 items was 0.950.

  Item Factor 1 Factor 2
Psychosocial disturbance Q16 0.979 –0.063
Q17 0.893 0.043
Q15 0.888 0.036
Q20 0.799 0.047
Q9 0.739 0.016
Q22 0.705 0.152
Q10 0.663 0.032
Q14 0.567 0.254
Functional disturbance Q7 0.413 0.408
Q13 –0.053 0.911
Q12 0.065 0.866
Q11 0.017 0.773
Q6 0.039 0.736
Q3 0.048 0.717
Q23 0.297 0.477
Q25 0.289 0.386

Table 4: Factor analysis results

Figure 1 shows the frequency distribution of the fin-Q total scores in the patient group. The Kolmogorov–Smirnov normality test obtained p=0.200, which indicated anormal distribution.

Figure 1: Frequency distribution of fin-Q total score in patient group. The final questionnaire’s 16 items are each evaluated on a five-grade scale (range, 0–64). The patient group’s score ranges from a minimum score of 2 to a maximum score of 60.

The correlation coefficients for fin-Q total scores with the NRS values and with the HADS scores in the patient and control groups showed moderate or higher correlations in all instances (Table 5). A significant sex difference in the fin-Q total scores was observed (Table 6). The correlation coefficients of patients group and control group between fin-Q total score and age were 0.171 (P=0.088) and 0.166 (P=0.097), respectively.

  Correlation coefficient (P)
  HADS Pain intensity Limitation by pain
  Anxiety Depression Maximum Average Daily activities Work Chewing
Total 0.253 (<0.001) 0.133 (0.042) 0.792 (<0.001) 0.798 (<0.001) 0.766 (<0.001) 0.679 (<0.001) 0.810 (<0.001)
Psychosocial disturbance 0.299 (0.003) 0.183 (0.005) 0.729 (<0.001) 0.744 (<0.001) 0.713 (<0.001) 0.645 (<0.001) 0.736 (<0.001)
Functional disturbance 0.193 (0.003) 0.094 (0.154) 0.806 (<0.001) 0.808 (<0.001) 0.768 (<0.001) 0.664 (<0.001) 0.839 (<0.001)

Table 5: Correlation between the fin-Q score and the HADS and NRS score

  Sex N Mean (SD) P
Patient

Men

18 17.7 (8.7) <0.001
Women 83 28.4 (10.7)
Control Men 72 3.1 (5.2) 0.299
Women 59 4.1 (5.3)

Table 6: Comparison of the fin-Q total score based on sex

Discussion

The objective of this study was to develop a new QOL questionnaire specifically for TMD patients. Compared to existing questionnaires, our questionnaire showed a high level of correlation with the patients’ subjective level of daily life, which indicated that we were successful in creating a valid candidate questionnaire.

Numerous questionnaires have been created to evaluate QOL. The Medical Outcomes Study (MOS) 36-item Short-Form Health Survey (SF36) is not specific to any disease, and can be used to evaluate QOL in healthy people [18-20]. The General/Geriatric Oral Health Assessment Index (GOHAI) is an oral health-related questionnaire that was originally created for elderly people [21]; however, its reliability and validity in other age groups has been demonstrated in several countries [22-25].

The most commonly used oral health-related QOL questionnaire is the OHIP. It has been modified to apply to implant patients, edentulous patients, and patients with partial dentures. The OHIP has a large score range; therefore, it can reflect small changes. Using the OHIP for TMD patients has been researched, but it does not sufficiently assess changes in TMD patients’ symptoms. Moufi et al. [15] found that within the OHIP total score range (0–196), the mean score of TMD patients was 60.6 (standard deviation [SD] =31.6). Rener-Sita et al. [26] found that the mean score of TMD patients was 44.0 (SD=37.5). Kothari et al. reported that the mean score of TMD patients was 80.8 (SD=44.3) [27]. These findings indicate that the OHIP contains many items that are unnecessary when applied to TMD patients, and few items are related to TMD.

The investigators in one study [15] ranked the OHIP items to select items with strong connections to patients with TMD, based on the strength of their relationship to TMD, and clarified which items were strongly related in patients with TMD. To create a questionnaire specifically for TMD patients, items would have to be added and eliminated from the OHIP. However, in the literature, we were unable to find any studies, including the Moufti study [15] that has used the OHIP questionnaire to create a new questionnaire.

Although the LDF-TMDQ, a questionnaire designed specifically for Japanese TMD patients with pain, was previously reported [11], its low mean score of 13.6 (SD=5.8) and little variation would make it difficult to use to appropriately evaluate the QOL of individual TMD patients or to assess in detail the amount of improvement from therapy. The LDFTMDQ does not contain any psychological items; therefore, it needs to be combined with the HADS or other scales to create a multidimensional questionnaire, which would make assessment more difficult. The aforementioned findings indicate that the existing QOL indices are insufficient for several reasons. Therefore, we created a new QOL questionnaire specifically for TMD patients.

In the present study, the selected items demonstrated stronger correlations to the QOL of TMD patients, compared to items used in previous studies. The questionnaire was evaluated via the breadth of the score distribution and correlation coefficients with the NRS.

The maximum fin-Q score was 64. The study participants’ responses in the present study showed a wide distribution and ranged from 2–60. The score distribution was wider than that of the OHIP and another QOL index for TMD patients. Individual patients exhibited varying levels of disturbance. The fact that this questionnaire could be applied to patients with small to large disturbance levels over a wide distribution indicated that it was easily able to reflect these differences. Therefore, it may also be able to reflect differences in the deterioration levels of a patient’s QOL from TMD symptoms.

The correlation coefficients between the fin-Q scores and NRS were 0.6–0.8, which showed a moderate or greater level of correlation. Sugisaki et al. [10] examined the extent that QOL questionnaire scores were correlated with pain intensity and subjective levels of disturbance, and found that the LDF-TMDQ exhibited correlation coefficients of 0.3– 0.6. Furthermore, the OHIP-TMD questionnaire created by Durham et al. [16] exhibited a correlation coefficient of 0.576 with VAS scores for current pain. Compared to the questionnaires used in the Sugisaki and Durham studies, the results of the present study presented a stronger correlation. This finding indicates that the fin-Q may assess the intensity of pain and degree of disturbance caused by pain more accurately than existing questionnaires.

In the present study, there were significant differences between the patient and control groups in regard to age and female sex. A significant correlation coefficient between age and the fin-Q total score was not observed in the patient group. Therefore, it appears that age had little impact.

In regard to the sex differences, a significant difference in fin-Q total scores was observed in the patient group, but not in the control group. Women generally tend to have higher levels of disturbance in oral healthrelated QOL, compared to men [28-30]. Moreover, the pain mechanism is influenced by many factors, which may account for the sex difference [31- 36]. The aforementioned findings suggest that different reference values for men and women may need to be created when using the questionnaire created in the present study.

In the future, repeat testing needs to be conducted, whether the same symptoms receive the same scores needs to be determined, and reproducibility needs to be examined. If this questionnaire demonstrates validity, it may be useful in assessing the effects of treatment. In addition, this questionnaire could be used as a base to develop a questionnaire for patients with orofacial pain.

Conclusion

We examined QOL questionnaire items among TMD patients and created a new QOL questionnaire comprising 16 items on areas such as difficulty in chewing food. This questionnaire correlated strongly with the patients’ pain intensity and subjective level of disturbance, which suggests it, may be possible to use it as an index for TMD patients’ QOL level or therapeutic effect.


References

  1. Okeson JP (2005) Bell’s orofacial pains: the clinical management of orofacial pain. 6th edition, Quintessence Publishing, Chicago (IL). [Ref.]
  2. Dworkin SF, Huggins KH, LeResche L, Von Korff M, Howard J, et al. (1990) Epidemiology of signs and symptoms in temporomandibular disorders: clinical sign in cases and controls. J Am Dent Assoc 120: 273-281. [Ref.]
  3. Rugh JD, Solberg WK (1985) Oral health status in the United States: temporomandibular disorders. J Dent Educ 49: 398-406. [Ref.]
  4. Dahlström L, Carlsson GE (2010) Temporomandibular disorders and oral health–related quality of life. A systematic review. Acta Odontol Scand 68: 80-85. [Ref.]
  5. Catunda IS, Vasconcelos BC, Andrade ES, Costa DF (2016) Clinical effects of an avocado-soybean unsaponifiable extract on arthralgia and osteoarthritis of the temporomandibular joint: preliminary study. Int J Oral Maxillofac Surg 45: 1015-1022. [Ref.]
  6. Durham J, Exley C, Wassell R, Steele JG (2007) ‘Management is a black art’—professional ideologies with respect to temporomandibular disorders. Br Dent J 202: 682-683. [Ref.]
  7. Koh H, Robinson PG (2003) Occlusal adjustment for treating and preventing temporomandibular joint disorders. Cochrane Database Syst Rev CD003812. [Ref.]
  8. Suvinen TI, Reade PC, Kemppainen P, Kononen M, Dworkin SF (2005) Review of aetiological concepts of temporomandibular pain disorders: towards a biopsychosocial model for integration of physical disorder factors with psychological and psychosocial illness impact factors. Eur J Pain 9: 613-633. [Ref.]
  9. Tsakos G, Marcenes W, Sheiham A (2001) Cross-cultural differences in oral impacts on daily performance between Greek and British older adults. Community Dent Health 18: 209-213. [Ref.]
  10. Sugisaki M, Kino K, Yoshida N, Ishikawa T, Amagasa T, et al. (2005) Development of a new questionnaire to assess pain-related limitations of daily functions in Japanese patients with temporomandibular disorders. Community Dent Oral Epidemiol 33: 384-395. [Ref.]
  11. Nishiyama A, Kuruma E, Hayashi K, Tsukagoshi K, Kino K, et al. (2014) Evaluation of therapeutic effects using the limitation of daily functions questionnaire in patients with temporomandibular disorders. Oral Health Dent Manag 13: 982-986. [Ref.]
  12. Allen F, Locker D (2002) A modified short version of the oral health impact profile for assessing health-related quality of life in edentulous adults. Int J Prosthodont 15: 446-450. [Ref.]
  13. Yule PL, Durham J, Playford H, Moufti MA, Steele J, et al. (2015) OHIPTMDs: as patient-reported outcome measure for temporomandibular disorders. Community Dent Oral Epidemiol 43: 461-470. [Ref.]
  14. Schiffman E, Ohrbach R, Truelove E, Look J, Anderson G, et al. (2014) Diagnostic Criteria for Temporomandibular Disorders (DC/ TMD) for clinical and research applications: recommendations of the International RDC/TMD Consortium Network and Orofacial Pain Special Interest Group. J Oral Facial Pain Headache 28: 6-27. [Ref.]
  15. Moufti MA, Wassell RW, Meechan JG, Allen PF, John MT, et al. (2011) The Oral Health Impact Profile: ranking of items for temporomandibular disorders. Eur J Oral Sci 119: 169-174. [Ref.]
  16. Durham J, Steele JG, Wassell RW, Exley C, Meechan JG, et al. (2011) Creating a patient-based condition-specific outcome measure for temporomandibular disorders (TMDs): Oral Health Impact Profile for TMDs (OHIP-TMDs). J Oral Rehabil 38: 871-883. [Ref.]
  17. Nishiyama A, Otomo N, Tsukagoshi K, Tobe S, Kino K (2014) The true-positive rate of a screening questionnaire for temporomandibular disorders. Open Dent J 8: 236-240. [Ref.]
  18. Ware JE Jr, Sherbourne CD (1992) The MOS 36-item short-form health survey (SF-36). I. Conceptual framework and item selection. Med Care 30: 473-483. [Ref.]
  19. McHorney CA, Ware JE Jr, Raczek AE (1993) The MOS 36-item Short-Form Health Survey (SF-36): II. Psychometric and clinical tests of validity in measuring physical and mental health constructs. Med Care 31: 247-263. [Ref.]
  20. McHorney CA, Ware JE Jr, Lu JF, Sherbourne CD (1994) The MOS 36-item Short-Form Health Survey (SF-36): III. Tests of data quality, scaling assumptions, and reliability across diverse patient groups. Med Care 32: 40-66. [Ref.]
  21. Atchison KA, Dolan TA (1990) Development of the Geriatric Oral Health Assessment Index. J Dent Educ 54: 680-687. [Ref.]
  22. Tubert-Jeannin S, Riordan PJ, Morel-Papernot A, Porcheray S, SabyCollet S (2003) Validation of an oral health quality of life index (GOHAI) in France. Community Dent Oral Epidemiol 31: 275-284. [Ref.]
  23. Othman WN, Muttalib KA, Bakri R, Doss JG, Jaafar N, et al. (2006) Validation of the Geriatric Oral Health Assessment Index (GOHAI) in the Malay language. J Public Health Dent 66: 199-204. [Ref.]
  24. Daradkeh S, Khader YS (2008) Translation and validation of the Arabic version of the Geriatric Oral Health Assessment Index (GOHAI). J Oral Sci 50: 453-459. [Ref.]
  25. Campos JADB, Zucoloto ML, Bonafé FSS, Maroco J (2017) General Oral Health Assessment Index: a new evaluation proposal. Gerodontology 34: 334-342. [Ref.]
  26. Rener-Sita K, Celebić A, Mehulić K, Petricevic N (2013) Factors related to oral health related quality of life in TMD patients. Coll Antropol 37: 407-413. [Ref.]
  27. Kothari SF, Baad-Hansen L, Svensson PJ (2017) Psychosocial profiles of temporomandibular disorder pain patients: proposal of a new approach to present complex data. Oral Facial Pain Headache 31: 199-209. [Ref.]
  28. Miettinen O, Lahti S, Sipilä K (2012) Psychosocial aspects of temporomandibular disorders and oral health–related quality-of-life. Acta Odontol Scand 70: 331-336. [Ref.]
  29. LeResche L (1997) Assessment of physical and behavioral outcomes of treatment. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 83: 82-86. [Ref.]
  30. Yeung E, Abou-Foul A, Matcham F, Poate T, Fan K (2017) Integration of mental health screening in the management of patients with temporomandibular disorders. Br J Oral Maxillofac Surg 55: 594- 599. [Ref.]
  31. McGrath C, Bedi R (2003) Measuring the impact of oral health on quality of life in Britain using OHQoL-UK(W). J Public Health Dent 63: 73-77. [Ref.]
  32. Klineberg I, McGregor N, Butt H, Dunstan H, Roberts T, et al. (1998) Chronicorofacial muscle pain: a new approach to diagnosis and management. Alpha Omegan 91: 25-28. [Ref.]
  33. Dao TT, LeResche L (2000) Gender differences in pain. J Orofac Pain 14: 169-184. [Ref.]
  34. Rollman GB, Lautenbacher S (2001) Sex differences in musculoskeletal pain. Clin J Pain 17: 20-24. [Ref.]
  35. Macfarlane TV, Blinkhorn AS, Davies RM, Kincey J, Wortington HV (2002) Association between female hormonal factors and oro-facial pain: study in the community. Pain 97: 5-10. [Ref.]
  36. MacGregor NR, Zerbes M, Niblett SH, Dunstan RH, Roberts TK, et al. (2003) Pain intensity, illness duration, and protein catabolism in temporomandibular disorder patients with chronic muscle pain. J Orofac Pain 17: 112-124. [Ref.]

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Article Information

Article Type: Research Article

Citation: Nakayama R, Nishiyama A, Shimada M (2017) Creating a Quality of Life Index for Patients with Temporomandibular Disorders. Int J Dent Oral Health 3(5): doi http://dx.doi.org/10.16966/2378-7090.241

Copyright: © 2017 Nakayama R, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Publication history: 

  • Received date: 22 Aug 2017

  • Accepted date: 07 Sep 2017

  • Published date: 13 Sep 2017

  •