Fabrication Of A Complete Denture In One-Visit Using Triad

Visible Light Cured (Vlc) Resin - A Case Report

Mansour K. Assery, BDS, MS* , Saleh M. Al-Shamrani, BDS, MS**
*Al Hada Armed Forces Hospital, P.O. Box 1347, Taif, Saudi Arabia.
**King Saud University, College of Dentistry, P.O. Box 60169, Riyadh 11545, Saudi Arabia.

In this case report, a method for fabricating a complete denture in one-visit using Triad Visible Light Cured (VLC) resin is described.
 

Under circumstances related to shortage of mate- rials or limitation of time, it can be helpful for the prosthodontist to utilize alternative procedure to expedite treatment.

Triad Visible Light-Cured (VLC) resin^f has been developed for many prosthodontic applications¹⁵ and has met the requirements for heat-cured base materials (American Dental Association specifica- tion No. 12). This VLC resin is available from dental suppliers in sheets of base plate thickness and in rope-form in light sealed envelopes. This VLC is similar to light-cured filling materials. The matrix is urethane dimethyacrylate with enough microfine silica to provide workable handling qualities. There is no free methyl (methacrylate) monomer in the uncured or cured material.

The purpose of this paper is to report the clinical and laboratory procedures to fabricate an upper complete denture in one-visit using VLC resin.
 

A 65-year-old edentulous male was referred to the Prosthodontics Clinic at Al-Hada Armed Forces Hospital in Taif for construction of an upper com- plete denture. The patient has a lower complete denture in good condition but the upper denture was lost. Being a teacher, it was important for him to have a denture as soon as possible.

An upper alginate impression was taken using a metal tray. The impression covered all the edentul- ous areas including the adjacent landmarks [Fig. 1a]. A study cast was prepared from the alginate impression and all the undercuts were blocked out with wax. A post dam area was prepared and then an air barrier coating was applied [Fig. 1b]. VLC resin sheets were adapted well to the prepared model making sure that no voids were created. It was cured in the Triad machine for 10 minutes according to the manufacturer's instructions. The material was then treated with air barrier coating and cured for 5 more minutes. An occlusal rim was constructed on the cured base to be used in record- ing jaw relation [Figs. 2a,b]. Vertical dimension of occlusion and centric relation records were obtained. Upper cast and lower denture were mounted on a hinge articulator [Figs. 3a,b]. Teeth of the proper mold and shade were selected. Retentive holes were prepared in the necks of the teeth. Bonding agent was applied and cured according to the manufacturer's instruction [Fig. 4a].

The occlusal rim was removed and replaced by a rope-form VLC resin. The teeth were arranged in the right position according to aesthetics and occlusion. The set-up, partially cured in the articulator, was tried and again cured in the patient's mouth [Figs. 4b and 5a]. New VLC resin was added to the border of the cured base and the maxillary denture was again border molded. The denture was sent to the laboratory for finishing and polishing. The denture was delivered to the patient [Fig. 5b].  

Visible light-cured resin has been developed and used for many prosthodontic applications. How- ever, its use for one-visit complete denture con- struction has not been independently evaluated.

The worrisome point in the case under review is the mechanical and chemical bonding between the acrylic teeth and the material. So far, this has with- stood the test in the last seven months. Since VLC resins are urethane dimethylacrylate matrix with acrylic co-polymer, it is expected that they will last as long as conventional PMMA resins bond well with them. However, even if the bonding is rela- tively short-lived, there appears to be a place for the use of this material in view of its relative ease of manipulation and the short time involved in the method described.

The materials and method employed in this case study have satisfied the prosthetic emergency needs of this patient, so far. It therefore justifies its recommendation for similar prosthodontic emergencies. Further work and follow-up are, however, recommended.