An interventional study of Computer-Assisted Software in Shade Matching, sponsored by Misr University for Science and Technology. Recruiting at 1 site in Egypt. Open to participants aged 18 Years to 45 Years. Per ClinicalTrials.gov, last updated 2026-07-16.
Sponsored by Misr University for Science and Technology · Not applicable, Interventional, and Diagnostic
This study aims to assess the agreement between new computer software using dental photographs, digital spectrophotometer and the visual technique, in achieving accurate resin composite shade matching.
Patients will be instructed to maintain an upright head posture with the interpupillary line parallel to the floor. All measurements will be performed under daylight, while extraneous light sources and environmental interferences to be minimized.
The Photo is firstly captured with a Nikon D3400 DSLR crop-frame camera (Nikon Corp) mounted on a stable tripod to avoid movements during capturing the photo and set the proper angulation and parallelism. All camera parameters will be standardized.
The program establishes a pixel-to-metric conversion scale (cm) from known distances and overlays orthogonal reference axes to fix landmark orientation and reproducible measurement geometry. Using these guides, tooth height and width are annotated, and the region of interest is consistently defined at the central area of the middle third of the labial crown of either the tooth or shade tabs.
Candidate shades are then quantitatively compared to the region of interest by computing CIEDE2000 color-difference values (ΔE₀₀), which incorporate corrections for lightness, chroma, and hue; the final selected shade is the one yielding the smallest ΔE₀₀.
Where: ΔL', ΔC', ΔH' are the lightness, chroma, and hue differences in the CIEDE2000 framework; SL, SC, SH are weighting functions; kL, kC, kH are parametric factors (set to 1 unless otherwise justified); and RT is the rotation term accounting for interaction between chroma and hue differences.
Agreement between their own assessments and between the other assessors' assessments, as well as the extent of their discrepancies, is quantified using kappa test.
Misr University for Science and Technology is the lead sponsor of 38 studies on the registry; 15 are open to participants now.
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Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
A pre-calibrated spectrophotometer (per manufacturer guidelines) independently measures tooth and shade-tab color. Measurements are reported as CIE L\*, a\*, b\* values. For each tooth-tab combination, the CIEDE2000 color difference (ΔE00) is calculated; the tab yielding the minimal ΔE00 is accepted as the selected shade.
Device: Computer-Assisted Software
Under the same conditions (lighting and patient positioning), experienced assessors independently determine the matching shade.
Device: Computer-Assisted Software
A standardized Computer-assisted photographic shade-matching workflow will be employed using a novel photo-analysis software that first receives the photos and balances each photo to suppress unrealistic colors using a standard gray reference card (WhiBal; Michael Tapes Design), with nominal colorimetric targets of L\* =75, a\* = 0, b\* = 0, will be included in every photograph within the plane of the teeth. The Photo is firstly captured with a Nikon D3400 DSLR crop-frame camera (Nikon Corp) mounted on a stable tripod to avoid movements during capturing the photo and set the proper angulation and parallelism. All camera parameters will be standardized. The program establishes a pixel-to-metric conversion scale (cm) from known distances and overlays orthogonal reference axes to fix landmark orientation and reproducible measurement geometry. Using these guides, tooth height and width are annotated, and the region of interest is consistently defined at the central area of the middle third.
Accuracy of computer software, digital Spectrophotometer and visual method in shade matching using resin composite tabs.
• The outcome evaluates agreement of the computer software in comparison to spectrophotometer and traditional visual method.
Time frame: Baseline
Plan to share: Yes — will be shared with supervisors
Supporting information: Study protocol, Statistical analysis plan, Informed consent form, Clinical study report, Analytic code
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Misr University for Science and Technology