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Abstract

BACKGROUND:

Removable partial dentures are an economical way of replacing lost structures, especially in cases where FPD or implants are not possible. Metal alloys by the conventional lost-wax technique are the most common way of fabricating such dentures which can be done by using either conventional casting wax or light-cure wax.

PURPOSE:

The objective of this study is to evaluate and compare the dimensional accuracy of cast partial denture frameworks fabricated using conventional casting wax and light-cure wax.

MATERIALS AND METHODS:

This

in vitro

studied was carried out in the Department of Prosthodontics and Crown and Bridges, and Department of Oral Pathology and Microbiology, KAHE's KLE VK Institute of Dental Sciences, Belagavi. A total of 30 samples were included in the study divided into two groups as follows: Group 1: cast partial denture frameworks fabricated using conventional casting wax and Group 2: cast partial denture frameworks fabricated using light-cure wax. A partially edentulous Kennedy's Class III Mod 1 metal die was created, which was then duplicated using a silicone duplicating material to form a master mold. 15 refractory (phosphate bonded investment) and 15 stone (Type III gypsum) casts were poured according to the manufacturer's instructions onto which conventional casting wax and light-cure wax was adapted, respectively, followed by subsequent investing and casting using cobalt–chromium alloy. The final frameworks were finished and polished and checked for dimensional accuracy by assessing the dimensional fit and the linear dimensional change. The dimensional fit was evaluated by measuring the gap between the palatal major connector and the palatal portion of the metal die at five different points: at midline, at 5 mm, and at 10 mm on either side of the midline, by interposing pattern resin between the two and checking thickness under a stereomicroscope. The linear dimensional change was assessed by calculating the difference of the distance between two specific points on the die and the frameworks. The data were subjected to independent

t

-test (

P

< 0.05).

RESULTS:

The dimensional fit of the Group 1 frameworks using conventional casting wax was 748.25 μm and Group 2 using light-cure wax was 794.02 μm. The result was statistically insignificant. The linear dimensional changes observed for Group 1 and Group 2 were 0.78 mm and 0.63 mm, respectively. The result was statistically insignificant.

CONCLUSION:

There was no significant difference between the dimensional accuracies of the cast partial denture frameworks fabricated using conventional casting wax and light-cure wax. Hence, the light-cure wax fabrication method can be considered as an alternative for the cast partial denture framework fabrication, as it is simple and much less time-consuming.

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