Smile design Sakarya: 3D cephalometric facial analysis, photo preview and digital CAD/CAM workflow

1. Digital smile design and laboratory workflow in Sakarya (Serdivan & Adapazarı)

Developed within the Sakarya (Serdivan and Adapazarı) digital CAD/CAM and laboratory ecosystem, the AtlasMaster workflow separates smile design into three measurable layers:

• Photo-based Constrained Canvas preview (2D): Operating on a de-identified mouth crop with a 4,686-pixel lip lock (contour deviation p95 ≤ 0.2 mm), the facial midline, incisal curve, and gingival zeniths are locked so photorealistic previews preserve true anatomical contours before any bur touches the tooth.
• 478-point 3D cephalometric facial analysis: From MediaPipe FaceMesh 3D coordinates, bizygomatic width (ZY-ZY, #234–#454) and bigonial mandibular width (Go-Go, #172–#397) are measured against anthropometric thresholds (Farkas 1994; Williams 1914; Frush & Fisher 1958 SPA factor; Lombardi 1973).
• 441-form tooth library and ExoCAD package (3D): Central incisor width-to-height ratio is segmented via SAM 2D to select 5 priority and 3 alternative morphologies from a 441-form library (476/477 STL/PLY 3D renders) for direct ExoCAD and chairside CAD/CAM fabrication.

2. Measured cephalometric evidence: locked n = 32 test set and Reaper audit

Untrained vision-language models misclassify broad or square-jawed (brachycephalic, Go-Go / ZY-ZY ≥ 0.82) faces as “oval.” Fine-tuning Qwen2.5-3B-Instruct-4bit (MLX QLoRA, 1,000 iterations) on rules distilled from 113 peer-reviewed papers produced these verified metrics on the locked n = 32 test set:

Model output is a computational morphology recommendation and rationale, not a clinical decision; all metrics derive from a 100% synthetic/locked test set, and clinical judgment belongs solely to the dentist. The full 4-arm ablation study on a 100% synthetic brachycephalic face (n = 1, Go-Go / ZY-ZY = 0.837) is documented in From Face to Tooth: 3D Cephalometric QLoRA.

3. Visual preview before tooth preparation and joint decision with the dentist

The engineering purpose of digital smile design preview is conservative planning and expectation alignment. Combining a 2D/3D Constrained Canvas preview with an intraoral temporary trial (mock-up) delivers three practical benefits:

• Enamel preservation: Through digital design and temporary mock-up before a bur touches the tooth, dentist and individual inspect the target morphology, supporting silicone-index composite injection (injection moulding) or prepless veneers without unnecessary reduction.
• Resolving natural vs prominent aesthetics upfront: Reviewing the photo preview and 3D STL/PLY design together reduces laboratory remakes across Serdivan and Adapazarı workflows.
• CAD/CAM material alignment: Glass-ceramic, composite moulding, and multi-layered monolithic zirconia restorations follow the same 3D digital blueprint.

4. Frequently asked questions (Smile design Sakarya)

How does photo-based 2D and 3D smile design preview work in Sakarya?

For dentists and digital dental laboratories across Sakarya (Serdivan and Adapazarı), facial photographs are combined with STL/PLY scans. Inside a de-identified mouth crop with a 4,686-pixel lip lock (p95 ≤ 0.2 mm), the midline and gingival zeniths are locked to produce a 2D preview and a 3D ExoCAD package before any tooth preparation.

Why use 478-point 3D cephalometric facial analysis instead of stock templates?

Eye-picked templates misread broad or square mandibles as oval. Using a 478-landmark MediaPipe FaceMesh 3D mesh, bizygomatic (ZY-ZY) and bigonial (Go-Go) ratios are measured to select 5 priority and 3 alternative morphologies from a 441-form library. On the locked n = 32 test set, facial shape accuracy rose from 0.0% (0/32) to 90.6% (29/32), and target tooth line accuracy reached 100.0% (32/32).

How does the visual preview support joint decision-making with the dentist?

Reviewing the candidate morphology in a Constrained Canvas followed by an intraoral mock-up clarifies natural versus prominent aesthetic preferences upfront, guiding injection moulding, prepless veneers, or CAD/CAM workflows while preserving enamel.

Does this page contain clinical promises, real patient photos, or pricing?

No. AtlasMaster is not a clinic; it provides computational smile design and visual preview services for dentists and laboratories. All metrics come from the locked n = 32 test set and a 100% synthetic face; no patient photos or prices are included, and clinical decisions belong solely to the dentist.