Fabrication of a stable record base for severe soft tissue undercuts in the edentulous patient

Modified Record Base Featuring Postpalatal Seal Using Silicone Bite Registration Material

“…The breakage of the border seal, in particular at its posterior end, compromises the retention of the record base. The blockout procedure should be kept to a minimum to avoid an excessive gap formation along the vestibules so the border seal is maintained along the labial/buccal vestibules by the lip/cheek draping actions over the corresponding borders of the record base 6 . However, there is no anatomic structure to aid the seal at the posterior end of the record base.…”

“…The blockout procedure should be kept to a minimum to avoid an excessive gap formation along the vestibules so the border seal is maintained along the labial/buccal vestibules by the lip/cheek draping actions over the corresponding borders of the record base. 6 However, there is no anatomic structure to aid the seal at the posterior end of the record base. The record base itself can feature a post dam on its posterior end without using a third material when a postpalatal seal is established physiologically on a final impression.…”

“…Methods introduced to enhance the fit and retention of the record base include staged processing, 5 relining using either soft liners or silicone impression materials, 6 and application of a denture adhesive underneath the record base. These methods are designed to minimize errors resulting from the dimensional change of the resin, fill the gaps underneath the record base, and adhere the record base to the oral mucosa, respectively.…”

“…2 However, the position of the record base over the edentulous maxillary arch is often unsecure because of the gaps in the tissue undercut areas and on the palate from the polymerization contraction of the resin. [2][3][4] Methods introduced to enhance the fit and retention of the record base include staged processing, 5 relining using either soft liners or silicone impression materials, 6 and application of a denture adhesive underneath the record base. These methods are designed to minimize errors resulting from the dimensional change of the resin, fill the gaps underneath the record base, and adhere the record base to the oral mucosa, respectively.…”