Development and validation of the Malay diagnostic criteria for temporomandibular disorders (DC/TMD) / Mohd Khairul Anwar Mohd Tahir

• Main Author: Mohd Khairul Anwar , Mohd Tahir
• Format: Thesis
• Published: 2018
• Subjects: RK Dentistry
• Online Access: http://studentsrepo.um.edu.my/11213/4/anwar.pdf; http://studentsrepo.um.edu.my/11213/

Introduction. The health status questionnaires measuring Oral Health Related Quality of Life has increased tremendously over the years. The Diagnostic Criteria for Temporomandibular Disorders (DC/TMD) was developed in 2014 and has been extensively used worldwide for Temporomandibular Disorders research and clinical settings. However, for this tool to be used in Malaysian culture, the tool has to be modified from the source version through a formal cross-cultural adaptation process. This study aims to develop and validate a Malay version of DC/TMD tool through established guidelines so that it can be used as a TMD diagnostic protocol among the Malaysian population who are majority Malay language speakers. The objectives of this study are to translate the English version of DC/TMD into Malay language and to assess the psychometric properties of the Malay DC/TMD. Methods. The DC/TMD was translated into the Malay language using a forward-backward method. The finalized translated version was given to a total of 252 subject which consist of 165 non TMD individuals and 87 TMD patients. The psychometric properties of 2 domains which were the Malay Graded Chronic Pain Scale (GCPS) and the Malay Jaw Functional Limitation Scale (JFLS) were assessed through internal consistency reliability, testretest reliability and validity tests. The literature on this topic was also reviewed. Results. The Cronbach’s alpha for both domains demonstrated good internal consistency of the items (Malay GCPS = 0.95, Malay JFLS = 0.97) while the intraclass correlation coefficient for test-retest reliability was 0.98 for Malay GCPS and 0.99 for Malay JFLS. There were 3 types of validity tests that were conducted namely, concurrent validity, construct validity and discriminant validity. All validity association iv were found statistically significant with good positive correlation except for the association between Malay GCPS and 3 items of Malay version of Oral Health Impact Profile (M-OHIP) which were poor negative correlations. Eleven out of fourteen constructed validity hypotheses were confirmed with 79% of the results corresponding to the itemized hypotheses. A specific OHIP tool for TMD (OHIP TMD) is recommended for a more sensitive result to be used in the future. Conclusion. The Malay version of DC/TMD is empirically shown to be valid and reliable for assessing TMD among Malay language speakers in Malaysia. A further study is recommended to collect more data for better supportive evidence. Key words: DC/TMD, cross-cultural adaptation, Malay language, Temporomandibular disorders, Reliability and Validity, Translation