Restoration of Posterior TeethNCT07088029
Clinical Performance Comparison Between Direct and Indirect Occlusal Veneers on Compromised Teeth: A Randomized Controlled Split-mouth Pilot Study
A study testing Indirect occlusal veneer (Occlusal veneer of lithium disilicate) and Direct occlusal veneer ( Occlusal Veneer of Composite resin) in people with Restoration of Posterior Teeth and Occlusal Veneers on Posterior Teeth, run by Ain Shams University at 1 site in Egypt.
Trial summary
The aim of the research is to study the mechanical behavior and clinical performance of veneers in posterior teeth. Clinical assessment and experimentation of two types of occlusal veneers will be conducted to evaluate their behavior. Read more about this study
- Who is it for?
- Ages 25 to 35 years
- Conditions the study is for
- Restoration of Posterior Teeth, Occlusal Veneers on Posterior Teeth
- What is being tested?
- Indirect occlusal veneer (Occlusal veneer of lithium disilicate) and Direct occlusal veneer ( Occlusal Veneer of Composite resin)
- Type of treatment
- Surgery or procedure
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 8 participants
- Where
- 1 siteEgypt
- Study dates
- 1 Aug 2025to 1 Aug 2026
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 25 to 35 years
- All sexes
- No healthy volunteers
- Adult
Who may be able to join
- Normal occlusion
- 25-35 years old
- Males or females having class II cavities indicated for occlusal veneers
Who cannot join
- Parafunctional habits
- Abnormal occlusion
- Extremely high caries risk patients
- Temporomandibular problems
Trial locations and contacts
1 site in 1 country.
Egypt1 site
Faculty of Dentistry, Ain Shams University
Cairo, Heliopolis, 4393005
About this study
Official title: "Assessment of Occlusal Veneer Restorations Performance in Posterior Teeth Under Various Simulated Loading Conditions." (A 3D Finite Element Analysis Study)
The aim of the research is to study the mechanical behavior and clinical performance of veneers in posterior teeth. Clinical assessment and experimentation of two types of occlusal veneers will be conducted to evaluate their behavior.
Read the detailed description
Occlusal veneers are restorations that restore the occlusal surface without axial wall involvement, allowing restoration of form, function, and esthetics of compromised or destroyed occlusal tooth structure in a conservative way as part of their treatment plan and the restorative process. The performance of occlusal veneer restorations is of paramount importance, as it determines the outcome and behavior of the final restoration. No ideal study has been conducted to evaluate teeth restored with occlusal veneer restorations. Evaluation must include all aspects of clinical performance, as some of the materials used in their fabrication have not been fully studied and should be studied to evaluate their clinical behavior using modified USPHS (United States Public Health Service) criteria. Which includes surface texture, anatomical form/wear, marginal integrity, marginal discoloration, secondary caries, color match and post-operative hypersensitivity.
- Being tested
- Indirect occlusal veneer (Occlusal veneer of lithium disilicate), Direct occlusal veneer ( Occlusal Veneer of Composite resin)
- Keywords
- occlusal veneer, direct occlusal veneer, clinical validation study, split-mouth clinical trial
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Indirect occlusal veneer (Occlusal veneer of lithium disilicate)Procedure or surgery
Also called Occlusal veneer of lithium disilicate
Split-mouth design, (right/left posterior tooth) will be restored with an Indirect occlusal veneer (Occlusal veneer of lithium disilicate). Indirectly fabricated occlusal veneers of lithium disilicate allow better control and design of the occlusal anatomy and proximal contacts, in addition to possessing better mechanical properties and fracture strength when compared to direct occlusal veneers. However, indirect occlusal veneers are lab fabricated, consequently, more clinical visits are required.
Direct occlusal veneer ( Occlusal Veneer of Composite resin)Procedure or surgery
Also called Occlusal Veneer of Composite resin
Split-mouth design, (right/left posterior tooth) will be restored with an occlusal veneer composite resin (Direct occlusal veneer). Directly fabricated occlusal veneers are a conservative approach, however, it requires a great skill from the operator to assure good margins and occlusal anatomy. Direct veneers are fabricated from composite resin and can be finished in a single visit, but longer chair time is required, in addition to the low wear resistance compared to ceramics. However, direct occlusal veneers have the benefit of resiliency close to that of natural dental tissue.
| Study group | Role | What they receive |
|---|---|---|
| Direct occlusal veneer ( Occlusal Veneer of Composite resin) | Experimental | Split-mouth design, (right/left posterior tooth) will be restored with an occlusal veneer composite resin (Direct occlusal veneer). Directly fabricated occlusal veneers are a conservative approach, however, it requires a great skill from the operator to assure good margins and occlusal anatomy. Direct veneers are fabricated from composite resin and can be finished in a single visit, but longer chair time is required, in addition to the low wear resistance compared to ceramics. However, direct occlusal veneers have the benefit of resiliency close to that of natural dental tissue. Receives: Procedure: Direct occlusal veneer ( Occlusal Veneer of Composite resin) |
| Indirect occlusal veneer (Occlusal veneer of lithium disilicate) | Active comparator | Split-mouth design, (right/left posterior tooth) will be restored with an Indirect occlusal veneer (Occlusal veneer of lithium disilicate). Indirectly fabricated occlusal veneers of lithium disilicate allow better control and design of the occlusal anatomy and proximal contacts, in addition to possessing better mechanical properties and fracture strength when compared to direct occlusal veneers. However, indirect occlusal veneers are lab fabricated, consequently, more clinical visits are required. Receives: Procedure: Indirect occlusal veneer (Occlusal veneer of lithium disilicate) |
What is being measured
The primary outcome is the main question the study is designed to answer.
Clinical assessment
Clinical performance of each direct \& indirect occlusal veneer using modified USPHS (United States Public Health Service) criteria. Each criterion will be graded as either Alpha, Bravo and Charlie.
- Surface texture: aplha: smooth as surrounding enamel, beta: rougher than enamel, charlie: very rough
- Anatomical wear; alpha: Restoration is continuous with existing tooth anatomy, bravo: Restoration is slightly discontinuous, charlie: restoration is discontinuous.
- Marginal integrity: alpha: Closely adapted, beta: Visible crevice,, charlie Crevice in which dentin is exposed.
- Marginal discoloration: alpha: No discoloration, bravo: Superficial staining , charlie: Deep staining.
- Secondary caries: aplha: no caries, charlie: caries present.
- Color match: aplha:No mismatch between restoration and tooth. bravo: Slight mismatch, charlie: unacceptable mismatch
The clinical performance will be evaluated by blinded evaluators, the data will be collected in a table for analysis.
Measured: 1 year follow up
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted28 Jul 2025
- Study start1 Aug 2025
- Primary completion1 Mar 2026
- Study completion1 Aug 2026
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Restoration of Posterior TeethStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Crossover
- Model description
- Split-mouth design, one side (right/left posterior tooth) will be restored with a direct occlusal veneer (occlusal veneer of direct composite resin) and the other side (right/left posterior tooth) will restored with an indirect occlusal veneer (occlusal veneer of lithium disilicate).
- Masking
- Single blind
- Who is masked
- Outcomes assessor
- Enrolment
- 8 participants (actual)
Sponsor and investigators
- Lead sponsor
- Ain Shams University
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07088029
- Sponsor's protocol ID
- FDASU-Rec ID042514
- Status last verified
- Feb 2026
- First submitted
- 15 Jun 2025
- Last updated
- 21 Oct 2026
- Results posted
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 21 Oct 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- "Assessment of Occlusal Veneer Restorations Performance in Posterior Teeth Under Various Simulated Loading Conditions." (A 3D Finite Element Analysis Study)
- ClinicalTrials.gov ID
- NCT07088029
- Acronym / sponsor ID
- FDASU-Rec ID042514
- Keywords
- occlusal veneer, direct occlusal veneer, clinical validation study, split-mouth clinical trial
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 8 participants (actual)
- Lead sponsor
- Ain Shams UniversityUniversity, hospital or other
- Study start
- 1 Aug 2025 (actual)
- Primary completion
- 1 Mar 2026 (actual)
- Study completion
- 1 Aug 2026 (actual)
- First posted
- 28 Jul 2025 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The aim of the research is to study the mechanical behavior and clinical performance of veneers in posterior teeth. Clinical assessment and experimentation of two types of occlusal veneers will be conducted to evaluate their behavior.
Detailed description
Occlusal veneers are restorations that restore the occlusal surface without axial wall involvement, allowing restoration of form, function, and esthetics of compromised or destroyed occlusal tooth structure in a conservative way as part of their treatment plan and the restorative process. The performance of occlusal veneer restorations is of paramount importance, as it determines the outcome and behavior of the final restoration. No ideal study has been conducted to evaluate teeth restored with occlusal veneer restorations. Evaluation must include all aspects of clinical performance, as some of the materials used in their fabrication have not been fully studied and should be studied to evaluate their clinical behavior using modified USPHS (United States Public Health Service) criteria. Which includes surface texture, anatomical form/wear, marginal integrity, marginal discoloration, secondary caries, color match and post-operative hypersensitivity.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- Single blind (outcomes assessor)
- Number of arms
- 2
- Model description
- Split-mouth design, one side (right/left posterior tooth) will be restored with a direct occlusal veneer (occlusal veneer of direct composite resin) and the other side (right/left posterior tooth) will restored with an indirect occlusal veneer (occlusal veneer of lithium disilicate).
| Arm | Type | Receives |
|---|---|---|
| Direct occlusal veneer ( Occlusal Veneer of Composite resin) | Experimental | Procedure: Direct occlusal veneer ( Occlusal Veneer of Composite resin)Split-mouth design, (right/left posterior tooth) will be restored with an occlusal veneer composite resin (Direct occlusal veneer). Directly fabricated occlusal veneers are a conservative approach, however, it requires a great skill from the operator to assure good margins and occlusal anatomy. Direct veneers are fabricated from composite resin and can be finished in a single visit, but longer chair time is required, in addition to the low wear resistance compared to ceramics. However, direct occlusal veneers have the benefit of resiliency close to that of natural dental tissue. |
| Indirect occlusal veneer (Occlusal veneer of lithium disilicate) | Active comparator | Procedure: Indirect occlusal veneer (Occlusal veneer of lithium disilicate)Split-mouth design, (right/left posterior tooth) will be restored with an Indirect occlusal veneer (Occlusal veneer of lithium disilicate). Indirectly fabricated occlusal veneers of lithium disilicate allow better control and design of the occlusal anatomy and proximal contacts, in addition to possessing better mechanical properties and fracture strength when compared to direct occlusal veneers. However, indirect occlusal veneers are lab fabricated, consequently, more clinical visits are required. |
Who may qualify
- Ages
- 25 to 35 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult
Key inclusion criteria (3 listed)
- Normal occlusion
- 25-35 years old
- Males or females having class II cavities indicated for occlusal veneers
Key exclusion criteria (4 listed)
- Parafunctional habits
- Abnormal occlusion
- Extremely high caries risk patients
- Temporomandibular problems
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Indirect occlusal veneer (Occlusal veneer of lithium disilicate)Also: Occlusal veneer of lithium disilicateSplit-mouth design, (right/left posterior tooth) will be restored with an Indirect occlusal veneer (Occlusal veneer of lithium disilicate). Indirectly fabricated occlusal veneers of lithium disilicate allow better control and design of the occlusal anatomy and proximal contacts, in addition to possessing better mechanical properties and fracture strength when compared to direct occlusal veneers. However, indirect occlusal veneers are lab fabricated, consequently, more clinical visits are required. | Procedure or surgery | Indirect occlusal veneer (Occlusal veneer of lithium disilicate) |
| Direct occlusal veneer ( Occlusal Veneer of Composite resin)Also: Occlusal Veneer of Composite resinSplit-mouth design, (right/left posterior tooth) will be restored with an occlusal veneer composite resin (Direct occlusal veneer). Directly fabricated occlusal veneers are a conservative approach, however, it requires a great skill from the operator to assure good margins and occlusal anatomy. Direct veneers are fabricated from composite resin and can be finished in a single visit, but longer chair time is required, in addition to the low wear resistance compared to ceramics. However, direct occlusal veneers have the benefit of resiliency close to that of natural dental tissue. | Procedure or surgery | Direct occlusal veneer ( Occlusal Veneer of Composite resin) |
Primary outcome
Clinical assessment
Time frame: 1 year follow up
Clinical performance of each direct \& indirect occlusal veneer using modified USPHS (United States Public Health Service) criteria. Each criterion will be graded as either Alpha, Bravo and Charlie. * Surface texture: aplha: smooth as surrounding enamel, beta: rougher than enamel, charlie: very rough * Anatomical wear; alpha: Restoration is continuous with existing tooth anatomy, bravo: Restoration is slightly discontinuous, charlie: restoration is discontinuous. * Marginal integrity: alpha: Closely adapted, beta: Visible crevice,, charlie Crevice in which dentin is exposed. * Marginal discoloration: alpha: No discoloration, bravo: Superficial staining , charlie: Deep staining. * Secondary caries: aplha: no caries, charlie: caries present. * Color match: aplha:No mismatch between restoration and tooth. bravo: Slight mismatch, charlie: unacceptable mismatch The clinical performance will be evaluated by blinded evaluators, the data will be collected in a table for analysis.
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 21 Oct 2026.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Indirect occlusal veneer (Occlusal veneer of lithium disilicate) and Direct occlusal veneer ( Occlusal Veneer of Composite resin) in people with Restoration of Posterior Teeth and Occlusal Veneers on Posterior Teeth, run by Ain Shams University at 1 site in Egypt.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 3 inclusion and 4 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 21 Oct 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Egypt. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Clinical assessment (time frame: 1 year follow up). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 21 Oct 2026.