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Updated: Mar 9, 2026

A Soft Tooling Process Chain for Injection Molding of a 3D Component with Micro Pillars
Published on: August 4, 2018
Ahila Singaravel Chidambaranathan1, Ramesh Reddy1, Suresh Rajendran2
1Reader, Department of Prosthodontics, SRM Dental College , Chennai, Tamil Nadu, India .
This study introduces a modified method for making custom dental impression trays using auto-polymerized PMMA resin. Traditional trays can lack precision, especially for complex dental restorations. The new approach uses a vacuum chamber to improve resin flow and reduce air bubbles. The process includes careful pouring, curing, and trimming to ensure a precise fit. The results show that the modified technique produces more accurate and reliable trays. These findings suggest that the new method could improve the accuracy of dental impressions, leading to better restorations.
Area of Science:
Background:
Dental impressions require trays that ensure even material distribution to improve cast accuracy. Traditional stock trays may not offer sufficient precision for complex cases. Auto-polymerized resins like PMMA are widely used for custom trays due to their adaptability. However, variations in tray fabrication can affect the final outcome. Existing methods rely on standard protocols that may lack optimization for specific clinical scenarios. Prior research has shown that custom trays improve inter-abutment distance measurements at both occlusal and gingival levels. This gap motivated the development of a modified fabrication technique. The goal is to refine the process for better clinical outcomes.
Purpose Of The Study:
This study aims to introduce a modified method for fabricating auto-polymerized PMMA resin trays to enhance their dimensional accuracy. The primary objective is to improve the reliability of impressions in dental restorations. The motivation stems from the limitations of conventional tray fabrication techniques. Custom trays are known to provide better precision than stock alternatives. The modified approach focuses on optimizing the resin distribution and curing process. It addresses inconsistencies in current methods that may affect tray uniformity. The study seeks to validate the effectiveness of the new technique through practical application. The outcome could influence clinical protocols for impression tray fabrication.
Main Methods:
The modified technique involves a step-by-step fabrication process using auto-polymerized PMMA resin. A wax model is first prepared to create a mold for the tray. The resin is mixed and poured into the mold according to the revised protocol. A vacuum chamber is used to eliminate air bubbles and ensure even distribution. The curing process is monitored closely to prevent warping or distortion. The tray is trimmed and adjusted to fit the patient’s dental arch precisely. Each step is documented to ensure reproducibility and standardization. The modified method is compared to traditional techniques for dimensional accuracy.
Main Results:
The modified technique produced PMMA trays with improved dimensional stability compared to conventional methods. The inter-abutment distance at both occlusal and gingival levels was more consistent. The vacuum-assisted pouring reduced voids and improved resin flow. The curing process yielded fewer deformations in the final tray. The trimmed trays showed better fit and adaptation to the patient’s anatomy. Clinical testing confirmed enhanced accuracy in impression material placement. The results suggest that the modified approach enhances the reliability of custom trays. These findings support the use of the new technique in dental practice.
Conclusions:
The modified technique for PMMA resin tray fabrication improves dimensional accuracy and reliability. The authors propose that the vacuum-assisted pouring enhances resin distribution. The results suggest that the new method is superior to traditional approaches. The study confirms that the modified process reduces inconsistencies in tray fabrication. The improved fit of the trays contributes to more accurate dental impressions. The authors suggest that this technique can be adopted in clinical settings. The findings align with the goal of enhancing impression accuracy. The study supports the use of modified methods for better clinical outcomes.
The modified technique uses vacuum-assisted pouring to reduce voids and improve resin flow, resulting in more consistent inter-abutment distances.
The vacuum chamber eliminates air bubbles and ensures even resin distribution, enhancing dimensional stability.
Proper curing prevents warping and deformation, ensuring the tray maintains its shape and accuracy.
Trimming ensures a precise fit to the patient’s dental arch, improving impression accuracy.
The modified method produces more consistent inter-abutment distances and fewer deformations than conventional techniques.
The authors propose that the modified technique can be adopted in clinical settings to enhance impression accuracy.