Reline

A denture reline is a prosthetic maintenance procedure that involves adding new acrylic resin or soft material to the tissue-bearing surface of an existing denture to restore intimate contact between the denture base and the patient's oral mucosa. Following tooth extraction or as part of the normal aging process, the alveolar ridge undergoes continuous remodeling that gradually changes the shape of the tissue surface against which the denture rests. As the gap between the denture base and the tissue increases, the patient experiences reduced retention, instability during function, sore spots from rocking movement, and difficulty eating. Relining addresses these issues by resurfacing the interior of the denture to match the current tissue topography without replacing the entire prosthesis.

Two categories of reline are available depending on clinical needs and patient circumstances. A chairside reline, also called a direct reline, is completed in the dental office in a single appointment using a self-curing or light-curing acrylic or soft liner material applied directly to the denture base while it is seated in the patient's mouth. A laboratory reline, also called an indirect reline, involves taking an impression with the existing denture as the tray, sending the denture to a dental laboratory for processing with heat-cured acrylic, and returning the finished denture at a subsequent appointment. Laboratory relines are generally more durable and precise than chairside relines but require the patient to be without the prosthesis for one to three days during processing. Soft relines using flexible silicone-based materials are prescribed for patients with chronically thin or tender tissue that cannot tolerate a rigid acrylic surface.

The CDT code set provides distinct codes for chairside versus laboratory relines and further differentiates between complete denture and partial denture applications, resulting in four primary reline codes that must be selected accurately. Insurance plans typically cover denture relines after a waiting period following initial denture delivery, often six to twelve months, and impose a frequency limitation of one reline per denture within a specified benefit period. Submitting a laboratory reline code for a chairside procedure or vice versa constitutes incorrect coding and may trigger a payer audit. Documentation should record the reason for the reline, the type of material used, and whether the reline was processed chairside or through the laboratory. Practices should also track lab fees associated with laboratory relines as a separate cost center to maintain accurate profitability analysis on prosthetic maintenance services.