Dental procedure D7953 refers to the "bone grafting procedure for the alveolar ridge," which involves augmenting the jawbone to prepare for dental implants or other restorative work. In contrast, D6104 pertains to "implant removal," specifically indicating the removal of a dental implant that may no longer be functional or is causing complications. Essentially, D7953 focuses on enhancing bone structure for future treatments, while D6104 deals with the extraction of an existing implant.