Introduction: The primary second molar relation is also called the terminal plane. which is the relation between the distal surface of the maxillary and mandibular second primary molars in a centric occlusion position. One of the most important characteristics of the ideal occlusion development on the primary dentition is if the primary second molar relation classified as the flush te... https://www.mamapaisa.com/product-category/leave-in-mask/