Dental Occlusion
Conditions
Brief summary
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.
Interventions
OTHERCAD-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).
OTHERCAD-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
Sponsors
Hams Hamed Abdelrahman
Study design
Allocation
NON_RANDOMIZED
Intervention model
SINGLE_GROUP
Primary purpose
DIAGNOSTIC
Masking
NONE
Intervention model description
Single group is receiving the two interventional arms
Eligibility
Sex/Gender
ALL
Age
18 Years to 35 Years
Healthy volunteers
No
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.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Static occlusal interference | Through study completion, average 12 months | it is measured at patient's maximum intercuspation using occlusense device |
| Dynamic occlusal interference | Through study completion, average 12 months | it is measured at patient's lateral mandibular movement using occlusense device |
Countries
Egypt
Outcome results
None listed