Assessing the feasibility of yttria-stabilized zirconia in novel designs as mandibular anterior fixed lingual retention after orthodontic treatment.

•Yttria-stabilized zirconia is an esthetic alternative for stainless steel retainers.•Y-TZP can be reliably milled to 0.48 mm in a curved geometry for a mandibular retainer.•More research is needed to determine the bonding protocol and clinical longevity.•Advanced technology is needed to fully personalize a milled retainer.•A milled Y-TZP retainer is more expensive than stainless steel but has advantages.