400 - Effect of a fixed (pin-retained) Lateral Maxillary Plate on Maxillary Arch Dimension in Complete Bilateral Cleft Lip and Palate.

Comparison of Effect of Non-Pin-Retained Lateral Maxillary Plate to Fixed (pin-retained) Lateral Maxillary Plate on Maxillary Arch Dimension in Complete Bilateral Cleft Lip and Palate,

Jamie Terrill, DMD, Dr. Daniel Stoeckel, DDS, Dr. O’Brien, Dr. Reddy.

Purpose: The purpose of the study is to determine if the fixed pin-retained lateral maxillary prosthesis will maintain the maxillary arch or reduce the maxillary lateral collapse.

Methods: A list of patients on the craniofacial team at Cardinal Glennon Children’s Hospital in Saint Louis, MO from 2009 and 2019 was reviewed to identify patients with BCLP treated at the age of 6 years with available photographs. Photographs were evaluated to find the incidence of posterior cross-bite and canine cross-bite on the maxillary arch in relationship with the mandibular arch of children who had the pin-retained LMP versus patients that had non-pin-retained LMP. The presence of cross-bite relationship of the maxillary arch was measured from the second primary molar and primary canine cusp at the age of 6 years old for comparison.

Results: Twenty-three photographs of patients with Bilateral Complete Cleft Lip and Palate (BCLP) have been identified to date. Eleven were treated with non-pin-retained fixation and twelve were treated with pin-retained fixation. Permutation test for equality of proportions with 2000 replications was utilized to analyze the measurements once data collection is complete.

Conclusion: Fixed plate prosthesis for complete bilateral cleft lip and palate, results in an improved occlusion outcome. Implications include better esthetics due to improved positioning of the premaxilla and improved speech development due to wider palate throughout the treatment process. It was also implied a decreased need for palatal expansion and improved patient’s moral. Further investigation and studies should be completed to evaluate these aspects of the benefits of the fixed plate prosthesis.