definiens: : means the field of ( i ) treatment, repair or replacement of bone and joint tissue, including, without limitation, meniscus and articular cartilage and ligaments and tendons, but excluding the Bone Disease Field, and ( ii ) treatment, repair or replacement of the tooth, dentin, alveolar bone, cementum, enamel, gingiva ( to the extent, but only to the extent, the gingiva functions as part of the apparatus holding the tooth to the jaw ) and/or periodontal ligament, but excluding the treatment of Oral Ulcerations ( as defined below ) or any other disease or disorder of the tissues of the mouth not involving the tooth, dentin, bone ( including alveolar bone ), cementum, enamel, gingiva ( to the extent, but only to the extent, the gingiva functions as part of the apparatus holding the tooth to the jaw ), ligament ( including the periodontal ligament ), tendon and/or cartilage