Regular and fast set material is available in 5 viscosities.
DEFEND VPS (vinyl polysiloxane) impression material is super hydrophilic for accurate impressions, does not slump, and has excellent tear strength to maintain impression integrity. The manufacturer notes that DEFEND has the same benefits of other brands but at less cost.
When the dentist evaluators were asked to rate DEFEND VPS impression material on its mix characteristics— how easily and cleanly it mixes—5 evaluators rated it as excellent to very good and 1 evaluator rated it as good. One evaluator commented that the material “mixed very well.” Another said, “The mix of the light body [material] was excellent. It flowed around the prep with ease. [A]fter it set, the margins were captured perfectly. A third evaluator noted the “mixing is easier compared to our usual impression material, particularly heavy and medium consistencies.”
The evaluators were asked to rate the importance of flow characteristics when choosing a VPS impression material. Four of the evaluators rated flow as very important and 2 rated it as important. When the evaluators were asked to rate DEFEND impression material on its flow characteristics, 6 rated it as excellent to very good and 1 rated it as poor. The evaluator who gave the material a poor score said that it showed a lack of flow characteristic. However, the other evaluators spoke positively about the material in this regard. One commented, “I thought the flow was excellent for the light body, and perhaps slightly too much for the heavy and medium.
But once set, the rigidity of both heavy and medium seems good.”
The evaluators rated hydrophilic characteristics as very important to important when purchasing a VPS impression material. With regard to DEFEND VPS impression material, 6 rated it as very good to good and 1 rated it as fair. They all agreed that DEFEND VPS is very similar to other VPS materials they have used when it comes to the results they achieve in a wet environment. One evaluator commented that he “only had voids from moisture contamination twice.”
Detail and Precision
When the 7 dentist evaluators were asked about the importance of detail and precision when choosing an impression material, all the evaluators said these characteristics are very important. The evaluators were then asked to rate DEFEND VPS impression material on detail and precision, 4 rated the material as excellent, 1 rated it as very good, and 2 rated it as good. Two of the evaluators noted that the detail and precision they achieved with DEFEND is comparable to other impression materials they have used. Another evaluator said, “Once we got a good impression, the detail was outstanding.”
Ease of Use
According to the manufacturer, DEFEND monophase material can be used very effectively for implant and single step techniques. Six of the 7 dentists who participated in the evaluation of DEFEND VPS impression material rated it as excellent to very good when it comes to overall ease of use; 1 evaluator rated it as good. One evaluator said, “The assistants all commented that [the material] is easy to mix.”
When the evaluators were asked if they would recommend DEFEND VPS impression material to colleagues within the dental professional, 4 said definitely and 3 said probably. When they were asked if they would purchase the material in the future, 6 said definitely or probably and 1 said that he wasn’t sure. At the end of the evaluation, the dentists were asked to rate their overall satisfaction with DEFEND VPS impression material. Six rated the product as excellent to very good and 1 rated it as good. One evaluator said, “I must admit I was a little concerned/apprehensive about using a fast-set material, but to my surprise, I had more than enough time to get trays loaded and get it to the mouth before the material set.”