The objective of this study was to compare the clinical effectiveness of personalized thermoformed occlusal splints together with behavioral and self-care therapy in the management of myalgia of the masticatory muscles. A controlled clinical trial was carried out with a total of 46 subjects diagnosed with myalgia according to the diagnostic criteria for temporomandibular disorders (DC / TMD). All subjects were treated with behavioral and self-care therapy (BST) at the beginning of the study, and were then randomized into 4 groups: behavioral and self-care control group; rigid occlusal splint group; soft occlusal splint group and non-occlusive splint group. Follow-ups were carried out at 2, 6 and 10 weeks, where it was evaluated: pain in the masticatory muscles, mandibular range of motion, mandibular functional limitation and occlusal discomfort.
Materials and method This randomized controlled clinical trial was conducted between October 2017 and January 2018 at the Dental Clinic of the Andrés Bello University (Viña del Mar, Chile). The study subjects were recruited from the universe of patients seeking treatment for jaw pain at the School of Dentistry. All subjects were informed about the study by their operator and gave their written consent before starting the study. The protocol, design and implementation were approved by the Scientific Ethics Committee of the Faculty of Dentistry of the Andrés Bello University, Viña del Mar, Chile (Folio No. 033, October 2017). Which was in accordance with the latest version of the Declaration of Helsinki of the World Medical Association (World Medical Association Declaration of Helsinki, 2013). Sample Size Calculation It was calculated according to a confidence level of 95% and a statistical power of 80%. Based on a previous study by Niemelä et al. (Niemelä et al., 2012) it was determined that the variance of the main variable (masticatory muscle pain) of the reference group is 2.6. In turn, the pain variable was measured on the visual analog scale (VAS), where a minimum clinically relevant difference was considered if a 3.5 point decrease was achieved on the VAS scale with respect to treatment, a reference that was also considered in this study. Randomization and interventions. After meeting the inclusion and exclusion criteria, the subjects were randomly assigned to four groups through a computationally generated sequence "list randomizer" developed by random.org. Evaluation methods The initial evaluation, to determine the degree of involvement of axis I, was carried out following the symptom questionnaire and clinical examination guidelines according to the DC / TMD protocol. Additionally, the questionnaire for the chronic pain degree scale (GCPS v2.0) and the functional limitation scale (JFLS-20) of axis II of the DC / TMD protocol were applied. In turn, an intraoral clinical examination was performed to exclude pain of dental origin. No subject was excluded for odontogenic pain. Statistic analysis The demographic characteristics of the sample were reported descriptively. The data studied were tested to determine normality by using the Shapiro-Wilk and Doornik-Hansen tests, data that were parametric, so they were analyzed with a mixed ANOVA test, a factorial part and a repeated means part for the variables degree of chronic pain, masticatory muscle pain, mandibular range of motion, functional limitation and occlusal discomfort. The level of significance used was established at p 0.05. All statistical analysis was performed using Statistical Package for the Social Sciences (SPSS) version 17 software (IBM, Chicago, USA).
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
46
It is based on the premise that cognition, the process of acquiring knowledge and forming beliefs, is a primary determinant of mood and behavior. The therapy uses behavioral and self-care techniques to identify, correct and prevent behaviors or situations capable of altering the subject's state
Occlusal splint formed in a vacuum from rigid individual sheets of 2 mm thick polyethylene terephthalate (Biolon, Dreve, Unna, Germany).
Occlusal splint formed in a vacuum from 3 mm thick individual soft sheets of ethyl vinyl acetate (Drufosoft, Dreve, Unna, Germany).
non-occlusive splint formed under vacuum from individual sheets of rigid polyethylene terephthalate 2 mm thick (Biolon, Dreve, Unna, Germany), from which the occlusal surfaces were cut and incisal edges, allowing the usual occlusal contact of each subject.
Universidad Nacional Andrés Bello
Viña del Mar, Chile
Masticatory muscle pain initial evaluation
Pain intensity was measured using a visual analog scale. Subjects were asked to mark the intensity of pain perceived at the time of examination. This scale has a score from 0 to 10, with 10 being the greatest pain experienced by the patient
Time frame: It was applied in the initial evaluation
Masticatory muscle pain at 2 weeks
Pain intensity was measured using a visual analog scale. Subjects were asked to mark the intensity of pain perceived at the time of examination. This scale has a score from 0 to 10, with 10 being the greatest pain experienced by the patient
Time frame: It was applied in week 2 of intervention.
Masticatory muscle pain at 6 weeks
Pain intensity was measured using a visual analog scale. Subjects were asked to mark the intensity of pain perceived at the time of examination. This scale has a score from 0 to 10, with 10 being the greatest pain experienced by the patient
Time frame: It was applied in week 6 of intervention.
Masticatory muscle pain at 10 weeks
Pain intensity was measured using a visual analog scale. Subjects were asked to mark the intensity of pain perceived at the time of examination. This scale has a score from 0 to 10, with 10 being the greatest pain experienced by the patient
Time frame: It was applied in week 10 of intervention.
Mandibular range of movement initial evaluation
Maximum opening of the mouth in an autonomous and comfortable way, that is, without feeling pain and not assisted by the operator, measured in millimeters from incisal edge to incisal edge in the anterior teeth, compensating for the overbite
Time frame: It was applied in the initial evaluation
Mandibular range of movement at 2 weeks
Maximum opening of the mouth in an autonomous and comfortable way, that is, without feeling pain and not assisted by the operator, measured in millimeters from incisal edge to incisal edge in the anterior teeth, compensating for the overbite
Time frame: It was applied in week 2 of intervention.
Mandibular range of movement at 6 weeks
Maximum opening of the mouth in an autonomous and comfortable way, that is, without feeling pain and not assisted by the operator, measured in millimeters from incisal edge to incisal edge in the anterior teeth, compensating for the overbite
Time frame: It was applied in week 6 of intervention.
Mandibular range of movement at 10 weeks
Maximum opening of the mouth in an autonomous and comfortable way, that is, without feeling pain and not assisted by the operator, measured in millimeters from incisal edge to incisal edge in the anterior teeth, compensating for the overbite
Time frame: It was applied in week 10 of intervention.
Mandibular functional limitation initial
Scale in charge of globally assessing masticatory limitation, vertical mobility limitation, verbal and non-verbal communication limitation, included within a 20-item instrument thanks to the survey of mandibular functional limitation of the DC / TMD. This scale has a score of 0 to 10, with 10 being a severe limitation
Time frame: It was applied in the initial evaluation
Mandibular functional limitation final
Scale in charge of globally assessing masticatory limitation, vertical mobility limitation, verbal and non-verbal communication limitation, included within a 20-item instrument thanks to the survey of mandibular functional limitation of the DC / TMD. This scale has a score of 0 to 10, with 10 being a severe limitation
Time frame: It was applied in week 10 of intervention.
Grade of chronic pain
The evaluation of the chronicity of the painful clinical picture and the disability that it involves was measured using the Graded Chronic Pain Scale of the DC / TMD, where I = Low intensity pain , without disability; II = High intensity pain, without disability; III = Moderate disability; IV = Severe disability.
Time frame: It was applied in the initial evaluation
Occlusal discomfort associated with an occlusal splint at 2 weeks
Scale responsible for evaluating adverse effects or discomfort of the subject to the occlusal splint during treatment, using a visual analog scale. This scale has a score of 0 to 10, with 10 being the greatest discomfort experienced by the patient.
Time frame: It was applied in week 2 of intervention.
Occlusal discomfort associated with an occlusal splint at 6 weeks
Scale responsible for evaluating adverse effects or discomfort of the subject to the occlusal splint during treatment, using a visual analog scale. This scale has a score of 0 to 10, with 10 being the greatest discomfort experienced by the patient.
Time frame: It was applied in week 6 of intervention.
Occlusal discomfort associated with an occlusal splint at 10 weeks
Scale responsible for evaluating adverse effects or discomfort of the subject to the occlusal splint during treatment, using a visual analog scale. This scale has a score of 0 to 10, with 10 being the greatest discomfort experienced by the patient.
Time frame: It was applied in week 10 of intervention.
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