Murakami M, et al. – This retrospective cohort study was designed not only to measure the survival rate of three types of obturator but also to examine the factors that expedite the removal of the obturator. It is preferable to use the least invasive design because obturator design had minimal impact on the ability of the appliance to maintain the surgical opening. The outcomes suggested that the follow-up examination should account for the type of primary disease, the anteroposterior location of the lesion, and the buccolingual direction of marsupialization.