NCT05718050

Mandibular Flexure in Patients

Mandibular Flexure: An In-vivo Study in Dentate Patients.

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 21 (actual)
• Sponsor: University of Rome Tor Vergata · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Accepted

Summary

The flexion of the mandible (MF) is a multifactorial phenomenon that occurs simultaneously with mandibular movements determining changes in the shape of the mandible. mandibular flexure (MF) may cause complications and failures in both conventional and implant-supported fixed dental prostheses (FDP) especially when a long-span prosthesis is planned to connect the anterior to the posterior region of the mandible. Previous studies reported increased biomechanical stress at the prosthetic and implant level, poor passivity of fit, impression distortion, pain during function, de-cementation of the prosthesis, porcelain chipping, prosthetic screw loosening and fracture, bone resorption and implant fracture. The aim of this study is to quantify the dimensional changes related to MF by means of a cone beam computed tomography (CBCT) between maximum opening (MO) and maximum intercuspation (OVD) positions. The null hypothesis was that there is no significant difference in terms of length and width of the mandible between maximum intercuspation and maximum opening positions.

Conditions

• Mandibular Flexure

Interventions

Type	Name	Description
DIAGNOSTIC_TEST	Mandibular flexure evaluation	A mandibular silicon impression was taken, and a vacuum molded thermoplastic stent with radiopaque fiducial markers (steel ball bearings) on the facial side of the canines and molars was fabricated for each patient. Two Cone Beam Computed Tomographs (CBCTs) were made per patient with their radiographic stent in the mouth at the OVD and MO positions at the University Advanced Digital Diagnostic Center. The CBCT examination was performed without any stitching procedure using a computed tomography (SCANORA 3DX; Dexis LLC) set up at 90 kV, 4 mA and a field of view (FOV) of 140 and 100 mm in height and width respectively, to decrease the radiation dose without affecting the quality of the examination.

Timeline

• Start date: 2018-03-21
• Primary completion: 2020-01-20
• Completion: 2022-05-01
• First posted: 2023-02-08
• Last updated: 2023-02-08

Locations

1 site across 1 country: Mexico