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NuSmile BioFlx FAQs

Bioflx crown is made of high impact, biocompatible, hybrid resin polymer used in the medical field where high strength, flexibility and durability are required. They are Bis-GMA free and contain no metal.

You can trim with crown and bridge scissors, when needed; and may be able to slightly contour with Howe Pliers; but you should not attempt to crimp BioFlx crowns.

It is neither a “snap fit”, nor a “passive fit”. BioFlx crowns should fit snugly on the tooth, with slight resistance that can be described as a snug or active fit. It will flex over small convexities of the tooth.

Cold sterilization, autoclave or steam sterilization may be used according to the standard instructions of the manufacturer of the sterilant or sterilizer. BioFlx crowns, as other pediatric crowns, are provided in non-sterile packaging. Clinician may choose to sterilize before use.

It is not recommended to use any kind of rotary instrument to adjust the occlusion of a BioFlx crown. The occlusal surface of the preparation should be reduced 1.5-2.0mm. The BioFlx crown should NEVER be the first point of contact in occlusion.

The radiopacity of BioFlx crowns is similar to the radiopacity of enamel and should allow radiographic evaluation of adaptation of the crown margins and pulpal therapy. 

If BioFlx crowns are contaminated with blood or saliva during try-in, they can be rinsed with water, dried and then cemented without any significant effect on cementation. 

BioFlx crowns will be available in narrow sizes to be easier to place in areas of space loss. Due their flexible nature and elastic memory, BioFlx crowns cannot be significantly altered in their shape or width with pliers. To fit BioFlx in areas of space loss, it is likely that circumferential reduction of the tooth will be needed to fit a smaller crown than would have been used if there were no space loss.

It is ok to use a lot of pressure, including the plastic end of a band seater to sit a BioFlx crown. Using a bite stick or the serrated metal end of a band pusher is not recommended. 

Due to a lack of clinical data, BioFlx crowns are not currently recommended for use with the Hall Technique or to be placed in situations where the occlusion is not well equilibrated. BioFlx crowns are not recommended in cases with bruxism.

A regular glass ionomer cement should be sufficient for cementing BioFlx crowns.  A self-setting resin modified glass ionomer cement can also be used. A light cured cement should NOT be used because the opacity of the crown will not let light pass through to set the cement.

Robust in house wear testing demonstrates that BioFlx crowns are at least as wear resistant as stainless steel crowns, after 800,000 cycles at 80 newtons on a Leinfelder wear machine. However, clinicians may see a “dimple” develop on the BioFlx crowns in areas of heavy occlusion. This “dimple” appears due to the self-adaptable technology of the material. Rather than wearing, the material “self adapts” to reduce the pressure of the opposing occlusal surface. For this reason, and for best results, it is recommended that BioFlx crowns not be placed in high occlusion on teeth with little or no occlusal preparation.