Introduction: Cleft lip and palate is the most common congenital facial anomaly in children, which can affect appearance, speech, hearing, growth, psychosocial well-being and social integration (Taib et al., 2015). It occurs due to insufficient closure of the nasolabial and maxillary processes during embryonic development, either on one side or on both sides. The palatal process, the contralateral process and the vomer i.e. one of the unpaired facial bones of the skull, located on the mid-sagittal line, fail to fuse in the mouth, which can result in a developmental anomaly. This creates an opening in the upper lip, soft palate and hard palate during development. The cleft separates the upper lip into two equal parts because it crosses under the left or right nostril (Čelešnik, 1963). Purpose: The purpose of the dissertation is to present a congenital facial anomaly - schisis and the fabrication of a plate and RME with acrylic plates and hooks for a face mask. The objectives are to describe the congenital facial anomaly, to produce a plate and RME with plates and hooks for the face mask, to describe its function and composition. The materials used for the fabrication, the process of familiarisation of the child with the plate and the progress of the treatment will also be described. Methods: The methods used in the study include an analysis of professional and scientific literature, a review of proceedings and journals in the Slovene and English languages, dealing with the field of maxillofacial and dental orthopaedics. The literature search was conducted in PubMed, Cochrane, Cinahl, ScienceDirect and COBISS databases for accessing literature in library. In searching for relevant sources, I used key phrases in Slovene and English, such as developmental anomalies, cleft lip and palate, schiza, etc. In addition, I described an orthodontic appliance, an acrylic plate and made RME with plates and hooks for the face mask based on the knowledge gained from the literature and the practice at the faculty. I documented each individual stage of fabrication with photographs and presented it in detail in my thesis. Results: In the thesis, the stages of the work of the acrylate plate and the RME with acrylate faces and face mask pegs are described in detail and illustrated using pictorial material. Discussion and conclusion: With timely and appropriate care, the schism can be successfully corrected. This appliance widens the upper jaw and later pushes it forward with the help of a face mask. Keywords: developmental abnormality, schizophrenia, child development
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