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The aim of the present study is to analyze if there is a biomechanical relationship between trunk flexion and buccal opening and to observe if there is an improvement of trunk flexion by performing the "sit and reach" test when stretching the masticatory muscles.
The study design is made up of a double-blind clinical trial with 60 participants randomly divided into two groups of 30 people each (Treatment group and Control group). Basal measurements of the mouth opening were taken with a vernier caliper and the trunk flexion measurements were taken by means of the "sit and reach" test. These measurements were carried out again after the intervention, which consisted of self-stretching of the masticatory muscles for the Treatment group and an occlusion of the mouth for the Control group. In the results there was an increase in the trunk flexion compared to the initial values in both groups (Treatment group 2.8 (1.51), Control group 1.97 (2.31) and this increase was greater in the Treatment group even though the difference with the Control group was not statistically significant. Therefore, the stretching of the masticatory muscles does not cause an immediate increase in the degree of trunk flexion measured by the "sit and reach" test. As a consequence, we cannot confirm the existence of a biomechanical relationship between trunk flexion and mouth opening.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Experimental group | Experimental | The experimental group did the intervention, which consisted of self-stretching of the masticatory muscles. This stretch consisted of introducing three knuckles of the non-dominant hand between the incisors for two minutes while sitting |
|
| Control group | Placebo Comparator | The control group was asked to introduce only two knuckles in the oral cavity and perform a mandibular occlusion, an intervention that serves as a simulated stretch in said group. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Self-stretching of the masticatory musculature | Other | If the subject belonged to the Treatment group, he was instructed to self-stretch the masticatory muscle. This stretch consisted of introducing three knuckles of the non-dominant hand between the incisors for two minutes while sitting. |
| Measure | Description | Time Frame |
|---|---|---|
| Trunk flexion | Trunk flexion in cm, taken by using the "sit and reach" drawer (Eve-que). The measurements were made three consecutive times with an interval of five seconds between them. The result of the arithmetic average of the three measurements was the one that was accounted for in the study. For the measurement of trunk flexion, the subject was placed on the floor with his back against the wall and having the soles of both feet in contact with the drawer. | 1 year |
| Measure | Description | Time Frame |
|---|---|---|
| Mandibular opening | Mandibular opening in mm., assessed using the vernier caliper (INCUTEX Germany GmbHl). The measurement was made three consecutive times with an interval of five seconds between them. The result of the arithmetic average of the three measurements was the one that was caliper (corresponding to 0 of the ruler) was placed at the upper end of the lower central incisors and measured to the edge of the corresponding central incisor. |
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Inclusion Criteria:
Exclusion Criteria:
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Laura Menés Fernández | Vilanova i la Geltrú | Barcelona | 08800 | Spain |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 27634081 | Background | Espejo-Antunez L, Castro-Valenzuela E, Ribeiro F, Albornoz-Cabello M, Silva A, Rodriguez-Mansilla J. Immediate effects of hamstring stretching alone or combined with ischemic compression of the masseter muscle on hamstrings extensibility, active mouth opening and pain in athletes with temporomandibular dysfunction. J Bodyw Mov Ther. 2016 Jul;20(3):579-87. doi: 10.1016/j.jbmt.2015.12.012. Epub 2016 Jan 7. | |
| 26218883 |
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| ID | Term |
|---|---|
| D013705 | Temporomandibular Joint Disorders |
| ID | Term |
|---|---|
| D017271 | Craniomandibular Disorders |
| D008336 | Mandibular Diseases |
| D007571 | Jaw Diseases |
| D009140 | Musculoskeletal Diseases |
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|
| Control group intervention | Other | The control group was asked to introduce only two knuckles in the oral cavity and perform a mandibular occlusion, an intervention that serves as a simulated stretch in said group. |
|
| 1 year |
| Background |
| Rodriguez-Blanco C, Cocera-Morata FM, Heredia-Rizo AM, Ricard F, Almazan-Campos G, Oliva-Pascual-Vaca A. Immediate Effects of Combining Local Techniques in the Craniomandibular Area and Hamstring Muscle Stretching in Subjects with Temporomandibular Disorders: A Randomized Controlled Study. J Altern Complement Med. 2015 Aug;21(8):451-9. doi: 10.1089/acm.2014.0332. Epub 2015 Jun 2. |
| D007592 |
| Joint Diseases |
| D009135 | Muscular Diseases |
| D009057 | Stomatognathic Diseases |