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Write up for polishing protocol of occlusal splint fabricated after 5 axis milling .. after the above picture content
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PMMA occlusal splint finishing polishing protocol dental laboratory
Finishing and Polishing Protocol
Following 5-axis wet milling and sprue removal, the occlusal splint was inspected under adequate illumination for residual milling marks, surface irregularities, sharp margins, and incomplete removal of sprue attachments. Gross irregularities were carefully reduced using fine-grit tungsten carbide or diamond rotary instruments at low speed with light, intermittent pressure. Particular care was taken to preserve the planned occlusal anatomy, occlusal contacts, border thickness, and intaglio-surface adaptation.
The external surfaces and peripheral margins were sequentially refined using progressively finer abrasive discs, rubber polishers, and silicone points suitable for PMMA. All borders were rounded smoothly to eliminate sharp edges that could cause soft-tissue irritation or patient discomfort. The fitting surface was minimally polished only where required to remove irregularities, thereby avoiding alteration of the internal adaptation of the splint.
Final polishing was performed with a soft brush or felt wheel and an acrylic-resin polishing paste under low pressure and controlled speed. Excessive heat generation was avoided throughout the procedure, as overheating may adversely affect the surface quality and dimensional stability of the milled PMMA splint. The appliance was then thoroughly rinsed with water to remove polishing residues and debris.
After polishing, the splint was ultrasonically cleaned in accordance with the material manufacturer’s instructions, rinsed with clean water, and dried completely. A final quality-control assessment was performed to confirm a uniformly smooth, glossy, non-porous surface; rounded and comfortable borders; absence of sharp edges or residual sprue marks; and preservation of the intended occlusal morphology. The finished occlusal splint was subsequently disinfected using a PMMA-compatible disinfectant before clinical delivery.
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This picture is for conventional heat cure resin , write the write up for milled occlusal splint with help of literature in articles similar or modified of conventional for polishing of milled occlusal splint
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https://pmc.ncbi.nlm.nih.gov/articles/PMC10264496/
Standardized Finishing and Polishing Protocol for CAD-CAM Milled PMMA Occlusal Splints
Following 5-axis milling, the occlusal splint was separated from the PMMA blank and inspected under adequate illumination. Unlike conventional heat-polymerized acrylic resin, CAD-CAM milled splints are fabricated from industrially pre-polymerized PMMA discs and generally exhibit a smoother initial surface. Therefore, aggressive trimming and coarse abrasion were avoided. Finishing was restricted to removal of sprue remnants, smoothing of the peripheral borders, and elimination of visible milling marks, while preserving the digitally designed occlusal morphology and intaglio-surface fit.
Residual sprue attachment sites were reduced using a fine cross-cut tungsten-carbide or fine diamond bur at low speed with light, intermittent pressure. The bur was moved continuously and used only on the external surface and borders. The fitting surface was not routinely ground or polished, except for removal of a clearly identified irregularity, to avoid altering the adaptation of the milled splint.
Surface refinement was performed using a graded sequence of fine abrasives under wet conditions. Water cooling and intermittent pressure were maintained to limit frictional heat and to prevent unwanted surface deformation. The occlusal surface was polished conservatively to retain the planned centric and excursive contacts. Peripheral margins were rounded and blended to eliminate sharp edges that may irritate the lips, cheeks, tongue, or gingival tissues.
Pre-polishing was carried out using a pumice-water slurry with a soft polishing brush. Final high-gloss polishing was then completed with a goat-hair, soft muslin, or felt wheel and a PMMA-compatible high-shine polishing paste. Low to moderate pressure was used throughout, and the appliance was kept in motion to avoid local overheating. The splint was subsequently rinsed thoroughly to remove pumice and polishing residues, cleaned ultrasonically where indicated by the material manufacturer, dried, and inspected before disinfection and delivery.
Suggested protocol table
| Step | Abrasive/polish | Tool | Speed/conditions | Duration* | Purpose |
|---|---|---|---|---|---|
| 1. Sprue removal | Fine cross-cut carbide or fine diamond bur | Low-speed handpiece | Low speed, light intermittent pressure; wet cooling if required | Only until sprue is removed | Remove sprue remnants without gouging the surface |
| 2. Border refinement | Fine carbide bur, fine silicone point, or fine abrasive disc | Handpiece/manual | Low speed, minimal pressure | As required | Round borders and remove sharp edges |
| 3. Surface smoothing | Fine-to-superfine abrasive discs or wet silicon-carbide papers, for example 600 then 800-1000 grit | Manual or low-speed handpiece | Wet abrasion; minimal pressure | Approximately 1 min per stage | Remove minor milling marks and refine the surface |
| 4. Pre-polishing | Pumice-water slurry | Soft brush or rag wheel | Low-to-moderate speed, light pressure | Approximately 1 min | Remove fine scratches and produce a uniform surface |
| 5. Final high-shine polishing | PMMA polishing paste, such as tin oxide-based or commercial acrylic polish | Goat-hair brush, soft muslin, or felt wheel | Low-to-moderate speed; continuous movement; avoid heat | Approximately 1 min | Produce a smooth, glossy, plaque-resistant surface |
| 6. Cleaning and quality control | Water rinse and manufacturer-compatible ultrasonic cleaning, if applicable | Ultrasonic cleaner/manual rinse | As per manufacturer instructions | As required | Remove residue and verify surface quality, comfort, and fit |
*The listed times are suggested standardization times for a study protocol. Actual clinical finishing should be limited to the minimum required to avoid altering the milled design.
Final inspection
The completed milled occlusal splint was assessed for:
- Complete removal and seamless blending of sprue sites
- Smooth, rounded peripheral margins
- Absence of scratches, grooves, sharp edges, or polishing residue
- Preservation of the digitally designed occlusal surface and contacts
- No unnecessary alteration of the intaglio surface
- Uniform gloss and a non-porous, cleansable external surface
Literature basis and modification from conventional heat-cure polishing
This protocol is adapted from conventional PMMA finishing methods but is intentionally more conservative during gross trimming and abrasion. In a study including a milled PMMA splint material, the finishing sequence used a cross-cut tungsten-carbide bur for surface grinding and edge smoothing, followed by pumice-water pre-polishing and goat-hair brush with high-gloss paste for final polishing. See the splint surface study.
A recent comparison of conventional and CAD-CAM splint materials used sequential 600-, 800-, and 1000-grit abrasives followed by wet pumice and final polish. The authors found that standardized polishing reduced roughness across fabrication methods, including milled splints. See the polished-surface study.
Milled CAD-CAM occlusal splints generally show good polishability and surface smoothness, but their final surface quality remains dependent on appropriate finishing. Grymak et al. reported that CAD-milled material achieved high gloss comparable with conventional heat-cured material after standardized polishing (PubMed record, PMID: 33341739). Because unnecessary abrasion can modify the milled anatomy and fit, the use of coarse 180- and 320-grit papers, as in conventional heat-cure resin protocols, is not recommended routinely for a 5-axis milled splint.
Same way write for 3d printed sla tech for Occlusal splint
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Same way write for 3d printed sla tech for Occlusal splint
Standardized Finishing and Polishing Protocol for SLA 3D-Printed Occlusal Splints
Following fabrication by stereolithography (SLA), the occlusal splint was post-processed strictly according to the instructions for use of the specific biocompatible splint resin. In contrast to CAD-CAM milled PMMA, SLA-printed appliances require removal of uncured resin and complete post-curing before finishing. These steps are necessary to obtain the intended mechanical properties, biocompatibility, and surface quality of the material.
After printing, the appliance was detached from the build platform and cleaned using the manufacturer-recommended solvent and washing system to remove uncured resin. A second clean solvent bath was used where recommended. The splint was dried completely, and supporting structures were removed carefully using resin-cutting pliers, rotary instruments, or a low-speed handpiece. Support remnants were trimmed conservatively to prevent damage to the appliance surface and to preserve the digitally designed occlusal anatomy.
The splint was subsequently post-cured in the manufacturer-specified light-curing unit, using the prescribed wavelength, duration, temperature, and protective atmosphere where applicable. Post-curing was completed before final polishing, as inadequate post-curing may adversely affect the material properties and surface integrity.
Support attachment sites, sharp borders, and visible layer irregularities were refined with fine tungsten-carbide burs, fine diamond points, or resin-finishing burs at low speed under light intermittent pressure. Coarse trimming was avoided, particularly on the occlusal surface and fitting surface, because excessive grinding may alter the planned occlusal contacts, splint thickness, adaptation, or surface texture. The intaglio surface was modified only if there was a visible support remnant, sharp irregularity, or clinically relevant fitting discrepancy.
Progressive polishing was performed using fine and extra-fine resin polishing discs, silicone rubber polishers, or wet abrasive papers. A sequence such as 600-, 800-, and 1000-grit abrasives may be used for standardized study procedures. Finishing was carried out with minimal pressure and adequate cooling, as excessive heat may damage the printed resin surface. The external and peripheral surfaces were then pre-polished using a soft brush and fine pumice slurry, followed by final polishing with a soft brush, muslin wheel, felt wheel, or a resin-compatible polishing paste. A light touch and continuous movement were maintained throughout to avoid localized heat generation or distortion.
After polishing, the occlusal splint was thoroughly rinsed to remove all abrasive and polishing residues. It was cleaned using a manufacturer-compatible method, dried completely, and inspected under adequate illumination. The appliance was then disinfected using a resin-compatible disinfectant before clinical delivery.
Suggested protocol table
| Step | Abrasive/polish | Tool | Speed/conditions | Duration* | Purpose |
|---|---|---|---|---|---|
| 1. Washing of printed splint | Manufacturer-recommended cleaning solution or solvent | Validated wash unit or ultrasonic cleaning system, if recommended | Follow resin manufacturer's instructions | As specified | Remove uncured resin from all surfaces |
| 2. Drying and post-curing | Not applicable | Manufacturer-recommended post-curing unit | Specified wavelength, temperature, time, and atmosphere | As specified | Achieve the intended degree of conversion and mechanical properties |
| 3. Support removal | Resin-cutting pliers, fine carbide bur, or fine diamond point | Hand instrument or low-speed handpiece | Low speed, light intermittent pressure | As required | Remove supports without damaging the splint |
| 4. Gross refinement | Fine carbide finishing bur or fine silicone point | Low-speed handpiece | Low speed; minimal pressure; avoid overheating | As required | Smooth support attachment sites and sharp edges |
| 5. Surface smoothing | Fine-to-superfine abrasive discs or wet silicon-carbide papers, for example 600, 800, and 1000 grit | Manual or low-speed handpiece | Wet finishing and gentle pressure | Approximately 1 min per stage | Reduce layer lines, scratches, and minor irregularities |
| 6. Pre-polishing | Fine pumice-water slurry or resin pre-polisher | Soft brush or rag wheel | Low-to-moderate speed; light pressure | Approximately 1 min | Produce a uniform smooth surface |
| 7. Final high-shine polishing | Resin-compatible high-gloss polishing paste | Goat-hair brush, soft muslin, or felt wheel | Low-to-moderate speed; continuous movement | Approximately 1 min | Obtain a smooth, glossy, cleansable surface |
| 8. Cleaning, inspection, and disinfection | Water rinse and manufacturer-compatible cleaning/disinfectant solution | Manual rinse or recommended cleaning system | Follow material instructions | As required | Remove residue and prepare appliance for delivery |
*For research standardization, the suggested duration may be used. Clinically, each step should be performed only for the minimum time needed to achieve a smooth and safe surface.
Final inspection criteria
The finished SLA occlusal splint was evaluated for:
- Complete removal of uncured resin and support structures
- Completion of the prescribed post-curing protocol
- Absence of sharp margins, support marks, visible layer irregularities, cracks, or scratches
- Smooth and rounded peripheral borders
- Preservation of occlusal morphology, centric contacts, excursive guidance, and appliance thickness
- Minimal modification of the intaglio surface to preserve adaptation
- A uniform, smooth, glossy, non-porous external surface that can be cleaned easily
- Complete removal of polishing residues before disinfection and delivery
Important modification from milled PMMA and conventional heat-cure resin
For an SLA-printed splint, the principal difference is that washing and post-curing are mandatory stages before polishing. Conventional heat-cure and milled PMMA appliances do not require removal of uncured photopolymer resin or light post-curing. In addition, printed resin is often more sensitive to surface damage from aggressive grinding. Therefore, support removal and finishing should be more conservative, and coarse abrasives should be avoided unless a major defect requires correction.
Polishing remains important because a rough printed surface can increase plaque retention, staining, patient discomfort, and wear of the appliance. A standardized sequence of progressively finer abrasives followed by pumice and a high-gloss resin polishing paste is suitable, provided it is compatible with the specific SLA resin and does not conflict with the manufacturer’s instructions for use.
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