A Novel Isolation Technique Using Polytetrafluoroethylene Tape and Split Dam Isolation for Cementation in Bridge Restorations
This case report presents a novel technique for bridge restoration using polytetrafluoroethylene (PTFE) tape and split dam isolation in situations where achieving complete dental dam isolation is challenging. Achieving high-quality isolation by controlling gingival crevicular fluid and intraoral relative humidity is important during cementation. However, an improved technique during bridge restoration is needed due to the difficulties faced with dental dam isolation. A porcelain fused to zirconia bridge extending from the maxillary canine to the first molar was used to demonstrate the novel restoration technique in this case report. Split dam isolation lowers the relative humidity in the oral cavity, and PTFE blocks the gingival crevicular fluid. The effects of combining PTFE tape with split dam isolation on isolation (controlling crevicular fluid, saliva, and relative humidity in the operative field) were similar to those obtained with dental dam isolation and made for easier removal of excess cement. The novel technique introduced in this case report can enhance isolation quality during bridge restoration.SUMMARY
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Intraoral images and full mouth series of X-rays of initial situation. A: Frontal view; B: Side view; C: Maxillary arch; D: Mandibular arch; E: Full mouth series.
Preparation for PVS impression and final impression. A: Preparation for PVS impression for abutments with double cord technique; B: Final impression close-up.
Digital design process for four-unit bridge. A: Scanned image of upper arch; B: Occlusal view of digitally designed four-unit bridge; C: Scanned image of side view; D: Side view of digitally designed four-unit bridge.
Try-in of fabricated zirconia bridge on stone model. A: Side view of fabricated four-unit zirconia bridge; B: Occlusal view of fabricated four-unit zirconia bridge.
Evaluation of the split dam isolation. A: The split dam isolation (SDI) for abutment teeth; B: Measurement of the relative humidity in SDI.
Polytetrafluoroethylene (PTFE) absolute isolation and try-in. A: Placement of the PTFE on the prepared teeth; B: Occlusal view of packing of the PTFE; C: Side view of packing of the PTFE; D: Side view for verification of the interference between the prothesis and the PTFE; E: Occlusal view for verification of the interference between the prothesis and the PTFE.
Cementation using resin luting cement. A: Delivery of the porcelain fused to zirconia bridge; B: Removal of the excess cement.
Intraoral images immediately after cementation. A: Front view; B: Side view; C: Occlusal view; D: View of centric occlusal position; E: View of lateral occlusal position.
Intraoral images 18 months after cementation. A: Front view; B: Side view; C: Occlusal view; D: View of centric occlusal position; E: View of lateral excursion position.
Evaluation of temperature and relative humidity in cementation. A: Measurement of intraoral temperature at several time points;
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