Accuracy of ringless casting and accelerated wax-elimination technique: a comparative in vitro study

Area of Science:

• Dental materials science
• Fixed prosthodontics
• Casting techniques

Background:

• Fabricating single unit castings is crucial in fixed prosthodontics.
• Conventional casting techniques can be time-consuming and may impact accuracy.
• Exploring efficient and accurate alternatives is essential for clinical practice.

Purpose of the Study:

• To evaluate the combination of ringless casting and accelerated wax-elimination for single unit castings.
• To determine if this combination offers a cost-effective, clinically acceptable, and time-saving alternative.
• To compare the accuracy of this novel technique against conventional methods.

Main Methods:

• Sixty wax patterns were fabricated and divided into four groups based on casting and wax-elimination techniques.
• Groups included ringless vs. conventional ring investment, and conventional vs. accelerated wax elimination.
• Vertical marginal gap was measured using a digital optical microscope and analyzed with two-way ANOVA.

Main Results:

• Castings from the ringless technique exhibited significantly smaller vertical marginal gaps (76.98 ± 7.59 μm) compared to the conventional metal ring technique (138.44 ± 28.59 μm).
• No significant difference in vertical marginal gaps was found between conventional (102.63 ± 36.12 μm) and accelerated wax-elimination (112.79 ± 38.34 μm) methods.
• The ringless technique demonstrated superior marginal accuracy.

Conclusions:

• The ringless investment technique yields more accurate castings.
• It can be effectively combined with accelerated wax elimination.
• This combination presents a viable, efficient alternative to traditional casting methods in fixed prosthodontics.