# Dimensional Analysis Of 3D-printed Dental Arches: Comparing Vat Photopolymerization Workflows

Timothy Fasham, Lebon Nicolas, Hélène Gouze, Philippe François, Floriane Laverne

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## To cite this version:

Timothy Fasham, Lebon Nicolas, Hélène Gouze, Philippe François, Floriane Laverne. Dimensional Analysis Of 3D-printed Dental Arches: Comparing Vat Photopolymerization Workflows. 103rd General Session & Exhibition of the IADR, Jun 2025, Barcelona, Spain. hal-05143720

HAL Id: hal-05143720

https://hal.science/hal-05143720v1

Submitted on 4 Jul 2025

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# View Abstract

## Proof

The abstract proof as submitted by the submitting author appears below. If there are edits, they must be provided to the submitting author to make in the system with enough time for the edits to be incorporated by January 28, 2025, 11:59 p.m. PT.

If the line "PREFERRED PRESENTATION TYPE: Proposal Submission" appears in the proof below, the abstract co-author notification you received is attached to a session proposal submission.

**CONTROL ID:** 4287207

**TITLE:** Dimensional Analysis Of 3D-printed Dental Arches: Comparing Vat Photopolymerization Workflows

**PREFERRED PRESENTATION TYPE:** Oral

**SCIENTIFIC GROUP/NETWORK CATEGORY:** Dental Materials 2: Polymer-based Materials

**PRESENTER:** Timothy Fasham

**PRESENTER (INSTITUTION ONLY):** Université Paris Cité

**AUTHORS (FIRST NAME INITIAL LAST NAME):** T. Fasham¹, N. LEBON³, H. Gouze⁵, P. Francois², F. LAVERNE⁴

**AUTHORS/INSTITUTIONS:** T. Fasham, Prosthodontics, Université Paris Cité, Paris, FRANCE;

P. Francois, Conservative Dentistry, Université de Paris, Le Chesnay, FRANCE;

N. LEBON, Léonard de Vinci Pôle Universitaire, Research Center, La Défense, FRANCE;

F. LAVERNE, Université Sorbonne Paris Nord, Villetaneuse, FRANCE;

H. Gouze, Centre for Research in Epidemiology and Population Health (U1808), Villejuif, FRANCE;

## ABSTRACT BODY:

**Objectives:** This study aimed to propose a novel approach to analyze 3D-printed dental arch models dimensions and compare the deviations resulting from various vat photopolymerization workflows (VPPW), each defined by a specific combination of printer, resin type and layers thicknesses.

**Methods:** A reference model (RM) of a digital dental arch with a custom support base was printed with different layer thicknesses and resins specific to one of the four 3D printers, one SLA printer (Form 3B+), one DLP printer (Pro95 S), and two LCD printers (Sonic Mini 8K; Form 4B) (Table 1). The RM and 110 scans of the printed models underwent the same mesh processing before dimensional analysis using a best-fit algorithm. The normalized deviation (ND) between the printed models and RM was calculated as the ratio of the integrated absolute distance (IIDI) to the area of valid distance (AVD). ND values were then weighted (wND) by the ratio of AVD to the surface area of the mesh-processed RM (ARMmesh) (Image 1).

**Results:** Weighting the values of ND was relevant into showing the discrepancy between models with either higher or lower AVD, however wND values could be more finely adjusted. Reducing the layer thickness (i.e. 50µm) was not consistently correlated with a decrease in wND for every VPPW (Image 2). Form 4B workflows provided overall lower wND than the other workflows.

**Conclusions:** A specific VPPW alone is not sufficient to ensure limited deviations. Instead, it is a combination of software and hardware parameters throughout the printing workflow which needs to be tuned to the characteristic of a specific resin.

## TABLE TITLE:

Resin material with their respective studied layer thicknesses and 3D printers

## TABLE:

<table><caption>Resin material with their respective studied layer thicknesses and 3D printers</caption><thead><tr><td>Resin material</td><td>Layer thicknesses (µm) and (code)</td><td>3D printer and technology</td></tr></thead><tbody><tr><td>Draft V2 resin, Formlabs, Somerville, USA</td><td>200 µm (DR200)<br>100 µm (DR100)</td><td>Form 3B+ using Form Auto, Formlabs SLA</td></tr><tr><td>Grey V4 resin, Formlabs, Somerville, USA</td><td>100 µm (GR100)<br>50 µm (GR50)</td><td>Form 3B+ using Form Auto, Formlabs</td></tr></tbody></table>
<table><thead><tr><th></th><th></th><th>SLA</th></tr></thead><tbody><tr><td>Die and Model 2 Tan resin, SprintRay, Los Angeles, USA</td><td>170 µm (DM170)<br>100 µm (DM100)<br>50 µm (DM50)</td><td>Pro95 S, SprintRay<br>DLP</td></tr><tr><td>Aqua-Gray 8K resin, Phrozen, Hsinchu City, Taiwan</td><td>50 µm (AG50)</td><td>Sonic Mini 8K, Phrozen<br>8K LCD</td></tr><tr><td>Fast Model V1 resin, Formlabs, Somerville, USA</td><td>200 µm (FM200)<br>100 µm (FM100)</td><td>Form 4B, Formlabs<br>4K LCD</td></tr><tr><td>Form 4B, Formlabs<br>4K LCD</td><td>50 µm (PM50)</td><td>Form 4B, Formlabs<br>4K LCD</td></tr></tbody></table>

TABLE FOOTER:

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IMAGE CAPTION:

**KEYWORDS:** vat photopolymerisation, dental models.

**AWARDS APPLICATIONS:**

**PRESENTER'S STUDENT STATUS:** PhD Student (after professional degree)

**SUPPORT FUNDING/GRANT NUMBER:**

**FINANCIAL INTEREST DISCLOSURE:** NONE

**Group Author Abstracts:** (none)

**ONE SENTENCE SUMMARY:** This study aims to emphasize that predicting deviations, solely based on a VPP technology (i.e., SLA, DLP, LCD), is not feasible; it is the interplay between software and hardware that have a greater impact on the final outcome if they are not adjusted to the printing volume, and the rheology and pigment composition of the resin material.

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