The Lava™ Chairside Oral Scanner (C.O.S.) offers efficiency and accuracy required to create precisely fitted restorations, resulting in a more satisfying experience for the dentist and patient. Dr. Brian Schroder and Chris Brown, BSEE, review the fundamentals of prep design, isolation and provisionalization with particular emphasis on techniques used to obtain ideal results as well as the benefits of Lava C.O.S.