This randomized split-mouth clinical trial evaluates whether computer-controlled intraosseous anesthesia delivered with the SleeperOne® 5 system reduces pain perception and dental anxiety compared with conventional local anesthesia during restorative treatment of children with molar-incisor hypomineralization (MIH). Thirty-five children received both anesthesia techniques in separate treatment sessions. Pain perception, behavioral responses, dental anxiety, pulse rate, and oxygen saturation were assessed at predefined time points.