An interventional study of Conventional Static Jaw Relation Registration and Dynamic Digital Jaw Tracking Registration in Chewing Efficiency in Completely Edentulous Patients Rehabilitated With Implant-Supported Full-Arch Prostheses, sponsored by Mansoura University. Recruiting at 1 site in Egypt. Open to participants aged 40 Years to 70 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-10-22.
Sponsored by Mansoura University · Not applicable, Interventional, and Treatment
This study aims to compare the chewing efficiency of implant-supported full-arch prostheses fabricated using two different jaw relation registration techniques: conventional static jaw relation registration and dynamic jaw tracking.
Ten completely edentulous patients will be recruited from the Department of Removable Prosthodontics, Faculty of Dentistry, Mansoura University. Each participant will receive implant-supported full-arch prosthetic rehabilitation according to the All-on-6 concept. Two definitive zirconia prostheses will be fabricated for each participant, one using conventional static jaw relation records and the other using dynamic jaw tracking records, in a crossover study design.
Chewing efficiency will be evaluated using a two-color chewing gum mixing test at the time of definitive prosthesis insertion, three months after insertion, and six months after insertion. The degree of color mixing will be analyzed using dedicated image-analysis software.
The study will investigate whether dynamic jaw relation registration provides different chewing efficiency outcomes compared with the conventional static technique in patients rehabilitated with implant-supported full-arch prostheses.
**Background**
Conventional complete dentures are widely used to rehabilitate completely edentulous patients; however, they may not fully restore masticatory function because of limitations in retention, stability, and supporting tissue conditions. Implant-supported full-arch prostheses provide an alternative rehabilitation option that can improve prosthesis stability, oral function, and patient satisfaction.
Accurate registration of the maxillomandibular relationship is an important component of prosthodontic treatment. Conventional jaw relation registration relies on clinical records, occlusion rims, and articulator-based procedures. Digital jaw tracking systems allow recording of mandibular movements and may facilitate the development of prostheses that better reflect individual mandibular dynamics. However, the effect of dynamic jaw relation registration on chewing efficiency in patients receiving implant-supported full-arch prostheses requires further clinical investigation.
**Objective**
The primary objective is to compare chewing efficiency between implant-supported full-arch zirconia prostheses fabricated using conventional static jaw relation registration and those fabricated using dynamic digital jaw tracking.
**Study Design**
This study will use a crossover clinical design involving ten completely edentulous patients recruited from the Department of Removable Prosthodontics, Faculty of Dentistry, Mansoura University.
**Participants**
Eligible participants will have completely healed residual alveolar ridges, a Class I maxillomandibular relationship, sufficient restorative space, and adequate bone dimensions in the planned implant placement areas. Patients with systemic disorders affecting bone healing, contraindications to surgery, a history of head and neck radiotherapy or chemotherapy, poor neuromuscular coordination, temporomandibular joint dysfunction, or parafunctional habits will be excluded.
**Interventions and Procedures**
Participants will receive conventional complete dentures initially. A radiographic guide and a computer-designed surgical guide will be fabricated using a dual-scan protocol to facilitate implant planning and placement according to the All-on-6 concept in the maxilla and mandible, subject to clinical and radiographic assessment.
After implant placement and completion of the required healing and prosthetic procedures, digital implant impressions will be obtained using intraoral scanning.
Two jaw relation registration approaches will be used:
Two definitive zirconia prostheses will be fabricated for each participant using the respective jaw relation registration technique. The order of assessment and prosthesis use will follow the finalized crossover protocol.
**Outcome Assessment**
The primary outcome will be chewing efficiency, assessed using a two-color chewing gum mixing test. Participants will chew the test material for specified numbers of chewing strokes. The flattened specimens will be analyzed using ViewGum software to quantify color mixing.
Measurements will be performed at the time of definitive prosthesis insertion (T0), three months after insertion (T3), and six months after insertion (T6), according to the finalized study protocol.
**Statistical Analysis**
Data will be analyzed using SPSS software, version 26. Quantitative data distribution will be assessed using the Shapiro-Wilk test. Normally distributed data will be summarized as mean and standard deviation, while non-normally distributed data will be summarized using the median and an appropriate measure of dispersion. Statistical tests appropriate for the crossover design, repeated measurements, and distribution of the data will be used. Statistical significance will be set at p ≤ 0.05.
Mansoura University is the lead sponsor of 1,114 studies on the registry; 185 are open to participants now.
Of its 9 completed or terminated interventional studies of FDA-regulated products, 0 (0%) have results posted.
Counted across the registry records on this site, refreshed daily.
**Inclusion Criteria**
**Exclusion Criteria**
Temporomandibular joint dysfunction
.
Participants will undergo conventional static jaw relation registration for the fabrication of an implant-supported full-arch zirconia prosthesis. Maxillary and mandibular record bases and occlusion rims will be used to record the vertical dimension of occlusion and centric relation. A facebow transfer and semi-adjustable articulator will be used for mounting and articulator adjustment. Chewing efficiency will be evaluated using a two-color chewing gum mixing test at the prespecified assessment time points.
Procedure: Conventional Static Jaw Relation Registration
Participants will undergo dynamic jaw relation registration using a digital jaw tracking system for the fabrication of an implant-supported full-arch zirconia prosthesis. Digital impressions will be obtained using an intraoral scanner, and mandibular movements will be recorded using a jaw tracking device with a central bearing device attached to the intraoral record bases. Chewing efficiency will be evaluated using a two-color chewing gum mixing test at the prespecified assessment time points.
Device: Dynamic Digital Jaw Tracking Registration
Conventional static maxillomandibular relationship registration for the fabrication of an implant-supported full-arch zirconia prosthesis. Maxillary and mandibular record bases and occlusion rims will be used to record the vertical dimension of occlusion and centric relation. A facebow transfer and semi-adjustable articulator will be used for maxillary cast mounting and articulator adjustment. Chewing efficiency will be evaluated using a two-color chewing gum mixing test at the prespecified assessment time points.
Dynamic digital maxillomandibular relationship registration for the fabrication of an implant-supported full-arch zirconia prosthesis. Digital impressions of the maxillary and mandibular arches will be obtained using an intraoral scanner. A digital jaw tracking device and a central bearing device attached to the record bases will be used to record mandibular movements and dynamic jaw relations. Chewing efficiency will be evaluated using a two-color chewing gum mixing test at the prespecified assessment time points.
Chewing Efficiency Assessed by Two-Color Chewing Gum Mixing Test
Chewing efficiency will be assessed using a two-color chewing gum mixing test. Participants will chew two differently colored chewing gums, and the resulting specimens will be flattened to a standardized thickness and analyzed using ViewGum software to quantify color mixing. Chewing efficiency will be compared between implant-supported full-arch prostheses fabricated using conventional static jaw relation registration and dynamic digital jaw tracking. The analysis will follow the prespecified scoring method, with the measurement scale and interpretation defined in the study protocol.
Time frame: At definitive prosthesis insertion (T0), 3 months after insertion (T3), and 6 months after insertion (T6).
Plan to share: No — Individual participant data will not be shared with other researchers. The study data will be used for the purposes of the present research, and the findings will be reported in aggregate form to protect participants' privacy and confidentiality. No individual participant data sharing is planned.
Started Aug 2026 (actual). Primary completion is estimated for Feb 2027, 6 months after the start.
How these figures are worked out, and which studies are left out of them.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
Contact study teamGet an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.