Authors : T. Giffin Mathew, Nitin Dungarwal, Trivedi Rutvik, Shyama Deora, Meghna Sharma, Kshemya Parmar, Divya Singh, Neha Agarwal, Nisha Kalal, Mrinal Singh
DOI : 10.38124/ijisrt/26sep1421
Volume : 11
Issue : 9
Year : 2026
Page No : 3226
Clear aligner therapy has shifted from being almost exclusively outsourced to commercial laboratories toward an in-house, or “chairside,” model in which the clinician controls scanning, digital treatment planning, 3D printing, and thermoforming within the practice itself. This places material selection, manufacturing technology, and biomechanical design directly in the orthodontist’s hands, yet practical guidance on translating this control into predictable tooth movement remains scattered across the literature. This narrative review consolidates current evidence on in-house clear aligner systems, covering the advantages and disadvantages of in-house fabrication relative to outsourced systems; the three principal in-house workflows - thermoformed, direct 3D-printed, and hybrid/multilayer aligners; the manufacturing technologies used to produce them, including fused deposition modelling (FDM) and vat-polymerization printing (stereolithography, digital light processing, and masked stereolithography/LCD); the mechanical behavior of the three thermoplastics most commonly used in-house - thermoplastic polyurethane (TPU), polyethylene terephthalate glycolmodified (PETG), and crystallized/co-polyester PET (PET-C) - framed through a wire analogy familiar to orthodontists, with particular attention to stress relaxation and force decay; attachment (“engager”) design and bonding protocols used to programme specific tooth movements; and severity-based correction algorithms for crowding and for vertical, transverse, and anteroposterior discrepancies. The review also outlines the practical problems encountered in day-to-day in-house practice, including force-calibration errors, fit and marginal-adaptation issues, under-delivery of planned interproximal reduction and proclamation, and staff-training demands. Taken together, the evidence indicates that inhouse aligner therapy can reduce turnaround time and increase clinician control, but that its success depends on a movement-specific approach to material selection, realistic mid-treatment monitoring, and a working understanding of how aligner materials behave mechanically after activation — knowledge that has traditionally resided with the outsourced laboratory rather than the clinician.