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The aim of the following study was to investigate the existence of a statistically significant correlation between the incisal features (incisal guidance angle, interincisal angle, overbite, overjet), temporomandibular joint (TMJ) morphology and its function. The hypothesis was:
I. The protrusive movement of the mandible does correlate with the TMJ anatomy. II. The protrusive movement of the mandible does not correlate with the incisal features.
III. The position and relationship of upper and lower permanent incisors do not have a direct and significant effect on the TMJ morphology in young adults.
The study was based on anatomical and functional measurements of the parameters within the masticatory system. The study group was composed in a way that all the participants (age 20-24) had the temporomandibular joints fully developed and at the same time not yet modified by adaptive processes.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Study group | Patients without any disorders and diseases in age range ensuring full temporomandibular joint development. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| CBCT | Radiation | CBCT scan |
|
| Measure | Description | Time Frame |
|---|---|---|
| Sagittal condylar guidance angle during protrusion | recorded with axiograph | evaluated within 24h from baseline visit |
| Vertical height of the temporomandibular joint fossa | measured on Cone Beam Computed Tomography | evaluated within 24h from baseline visit |
| Sagittal condylar guidance angle on Cone Beam Computed Tomography | conducted in 4 variants of measurements | evaluated within 24h from baseline visit |
| Features of the incisors | incisal guidance angle, interincisal angle, overjet, overbite measured on Cone Beam Computed Tomography | evaluated within 24h from baseline visit |
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Inclusion Criteria:
Exclusion Criteria:
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primary care clinic
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| Name | Affiliation | Role |
|---|---|---|
| Łukasz Lassmann, DDS | Dental Sense Medicover, 80-283 Gdańsk, Poland | Study Director |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Dental Sense Medicover | Gdansk | Pomeranian Voivodeship | 80-283 | Poland |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 23633793 | Background | Prasad KD, Shah N, Hegde C. A clinico-radiographic analysis of sagittal condylar guidance determined by protrusive interocclusal registration and panoramic radiographic images in humans. Contemp Clin Dent. 2012 Oct;3(4):383-7. doi: 10.4103/0976-237X.107419. | |
| 22977723 | Background | Shreshta P, Jain V, Bhalla A, Pruthi G. A comparative study to measure the condylar guidance by the radiographic and clinical methods. J Adv Prosthodont. 2012 Aug;4(3):153-7. doi: 10.4047/jap.2012.4.3.153. Epub 2012 Aug 28. |
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| ID | Term |
|---|---|
| D013705 | Temporomandibular Joint Disorders |
| D001733 | Bites and Stings |
| ID | Term |
|---|---|
| D017271 | Craniomandibular Disorders |
| D008336 | Mandibular Diseases |
| D007571 | Jaw Diseases |
| D009140 | Musculoskeletal Diseases |
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| 6584415 | Background | Dawson PE. Determining the determinants of occlusion. Int J Periodontics Restorative Dent. 1983;3(6):8-21. No abstract available. |
| 29322857 | Background | Han S, Shin SM, Choi YS, Kim SY, Ko CC, Kim YI. Morphometric analysis for evaluating the relation between incisal guidance angle, occlusal plane angle, and functional temporomandibular joint shape variation. Acta Odontol Scand. 2018 May;76(4):287-293. doi: 10.1080/00016357.2017.1420227. Epub 2018 Jan 11. |
| Background | Luca, L.; Manfredini, D.; Arveda, N.; Rossi, L.; Siciliani, G. A Cone-Beam Computerized Tomography Assessment of the Relationship between Upper Incisors Inclination and Articular Eminence Features in Orthodontically Untreated Patients with Different Facial Type. J World Fed Orthod 2016, 5 (2), 56-63. https://doi.org/10.1016/j.ejwf.2016.05.001 |
| 28600812 | Background | Manfredini D, Lombardo L, Siciliani G. Temporomandibular disorders and dental occlusion. A systematic review of association studies: end of an era? J Oral Rehabil. 2017 Nov;44(11):908-923. doi: 10.1111/joor.12531. Epub 2017 Jul 2. |
| D007592 |
| Joint Diseases |
| D009135 | Muscular Diseases |
| D009057 | Stomatognathic Diseases |
| D011041 | Poisoning |
| D064419 | Chemically-Induced Disorders |
| D014947 | Wounds and Injuries |