Virtual Reproduction of Mandibular Movement for Assessing Occlusal Interferences and Adjustments

Reliability of Virtual Reproduction of Mandibular Movement for Assessing Occlusal Interferences and Adjustments of Designed and Milled Cad-cam Zirconia Crowns; a Diagnostic Accuracy Trial

Computer-aided designs have considered dynamic occlusion with virtual articulator systems. However, the process involved is currently lengthy. The simplified transfer of casts from a mechanical to a virtual articulator has required bulky and expensive instruments. Recently, new methods based on mandibular motion tracking using optical devices have been introduced for integrating individual functional movement into occlusal morphology.

The aim of this study: This study will clinically assess the reliability of the virtual reproduction of mandibular movement for detecting occlusal interferences and adjustments of designed and milled CAD-CAM zirconia crowns using a digital occlusal analyzer.

Materials and methods: Intraoral optical impression will be made for thirteen selected patients with endodontically treated maxillary first premolars after abutment preparation followed by buccal and lateral interocclusal records taking. Two zirconia crowns will be fabricated for each patient following regular digital workflow with twenty six zirconia crowns, which will be allocated according to the virtual method of adjustment of occlusal interferences into two groups (Group I: Virtual occlusal interferences adjustment of CAD-CAM zirconia crowns using buccal interocclusal record (n=13) and Group II: Virtual occlusal interferences adjustment of CAD-CAM zirconia crowns using buccal and lateral interocclusal records (n=13)). Then milling and sintering of all crowns will be performed following the manufacturer's instructions. The occlusion of all crowns will be analyzed using an electronic pressure analyzer. All data will be statistically analyzed and discussed in light of the results obtained.

Study Overview

• Status: Completed
• Conditions: Dental Occlusion
• Intervention / Treatment: Other: CAD-CAM zirconia crowns using buccal interocclusal record.; Other: CAD-CAM zirconia crowns using lateral interocclusal records.

• Study Type: Interventional
• Enrollment (Actual): 26
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Egypt
  • Alexandria, Egypt
    • Alexandria Faculty of Dentistry

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

The patient presented with successful endodontically treated maxillary 1st premolar.

• Patients having class I occlusion.
• Good oral hygiene with no signs of periapical pathology or periodontal disease(24).
• Patient having natural teeth as opposed to dentition.

Exclusion Criteria:

• Pregnancy, which prevents the use of diagnostic x-rays.
• Parafunctional habits.
• Mobility in the abutment teeth more than grade 1.
• Patient presenting allergy to materials being used.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Diagnostic
• Allocation: Non-Randomized
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: Buccal interocclusal records	Other: CAD-CAM zirconia crowns using buccal interocclusal record.; Virtual occlusal interferences adjustment of CAD-CAM zirconia crowns using buccal interocclusal record. First, scanning the buccal interocclusal record for each patient with the two arches in maximum intercuspation position (MIP) will be performed. The IOS will immediately reproduce the occlusal state of the digital casts; this method is called the buccal bite registration method (BBR).
Experimental: Lateral interocclusal records	Other: CAD-CAM zirconia crowns using lateral interocclusal records.; Virtual occlusal interferences adjustment of CAD-CAM zirconia crowns using lateral interocclusal record. A second scan will be performed for each patient to record lateral mandibular excursion. Then, three STL files will be exported; maxillary arch, mandibular arch at MIP and lateral mandibular excursion

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Static occlusal interference	it is measured at patient's maximum intercuspation using occlusense device	Through study completion, average 12 months
Dynamic occlusal interference	it is measured at patient's lateral mandibular movement using occlusense device	Through study completion, average 12 months

Collaborators and Investigators

• Sponsor: Hams Hamed Abdelrahman

Study record dates

Study Major Dates

• Study Start (Actual): September 11, 2022
• Primary Completion (Actual): December 9, 2023
• Study Completion (Actual): December 9, 2023

Study Registration Dates

• First Submitted: February 15, 2024
• First Submitted That Met QC Criteria: February 15, 2024
• First Posted (Actual): February 22, 2024

Study Record Updates

• Last Update Posted (Actual): February 22, 2024
• Last Update Submitted That Met QC Criteria: February 15, 2024
• Last Verified: February 1, 2024

More Information

Terms related to this study

• Other Study ID Numbers: 0266-07/2021 - 18/07/2021

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No