{'fraction_non_alphanumeric': 0.02828893161219445, 'fraction_numerical': 0.012908541609447955, 'mean_word_length': 5.166807790008467, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 1, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Evaluation of two palatoplasty techniques in patients with cleft palate

Introduction: The aim of this study was to make a comparative evaluation between two palatoplasty techniques Von Langenbeck and Veau-Wardill-Kilner by evaluating if such techniques succeed in closing the palatine fissure and correcting hypernasality. Methods: Patients undergoing palatoplasty surgery in the period from 2011 to 2014 by means of the Oral and Maxillofacial Surgery Department of the Hospital of Face Defects were selected and requested to undergo a new evaluation. The medical records of patients who attended the new evaluation were assessed as to the number of surgeries performed and patients undergoing physical examination to check for the presence of fistulas, and they were asked about the improvement in hypernasality. Results: 10 out of the total number of operated patients attended for evaluation, and none of them had an oronasal fistula. The Von Langenbeck technique proved to be effective in 67% of the cases in closing the gap in the first surgery, whereas the Veau-Wardill-Kilner technique was effective in 50% of the cases. Concerning the correction of hypernasality, Von Langenbeck was effective in 67% of the case, and Veau-Wardill-Kilner, in 75%. Conclusion: The Von Langenbeck technique was more effective in closing the Cleft Palate and Cleft Lip, while Veau-Wardill-Kilner technique was effective in correcting hypernasality. Correspondence to: Dr. Fábio Ricardo Loureiro Sato, Oral and Maxillofacial Surgery Area, State University of São Paulo – UNESP, College of Dentistry – São José dos Campos, Av. Eng. Francisco José Longo, 777 – 12245-000 São José dos Campos – SP – Brazil; Phone/Fax: +55 12 3947-9000; E-mail: fabio.sato@ict.unesp.br


Introduction
Cleft lip and cleft palate are the most common congenital anomalies affecting the face, with an incidence of approximately 0.5 individuals every 1,000 live births [1]. This malformation can present itself in many ways, involving lip, palate or both structures.
Cleft lip usually has a greater aesthetic and social impact; however, cleft palate has the greatest functional impacts.
The goals of palatoplasty are, of course, in addition to closing the oral and nasal communication, to promote an intelligible speech, as close as possible to the normal range, and prevent interference with the maxillary growth (which, in the future, would entail the need for orthopedic maxillary expansion and subsequent orthognathic surgery).
During palatoplasty, care is essential to reposition anatomically the levator muscle of the soft palate, which is inserted into the posterior border of the hard palate with longitudinally directed fibers. The disinsertion of the fibers and repositioning thereof in cross direction, uniting them with the fibers across the fissure, allows sphincteric and lifting function of the palatine musculature required for oronasal occlusion [2].
There are several palatoplasty techniques described in the literature, the choice based on several criteria: type of fissure, fissure extension, preference and technical skill of the surgeon.
Within the available techniques, the two most used palatoplasty techniques for patients with cleft palate by our service are the Von Langenbeck and de Veau techniques with Wardill-Kiner modifications, as in other services in Brazil, according to a survey of Paranaíba et al. [3].
The Von Langenbeck technique of was described initially in 1861 [4], and advocated the use of mucoperiosteais bipedicle flaps, which is still the most used palatoplasty technique nowadays (Figures 1  and 2). De Veau Palatoplasty with two flaps associated with "pushback" procedures with elongation of the palate in VY as recommended by Wardill [5] and Kilner [6] is also quite popular, because theoretically would decrease the possibility developing velopharyngeal dysfunction (Figures 3 and 4).
Although widely used, to date, few studies evaluated the effectiveness in closing of palatine fissure of both techniques in a comparative way. Thus, the aim of this study is to conduct a retrospective study of the effectiveness of these techniques as to two criteria: presence of residual fistula and improved hypernasality from the patient's point of view. Patients were then asked to return for evaluation, in order to check the presence of possible remaining oronasal fistula and requested to assess subjectively the improvement in hypernasality.

Results
10 patients out the total of patients operated in this period returned and were again evaluated by the researchers and asked about the improvement in velopharyngeal function. 8 out of these 10 patients were female and two were male, with an average age of 14 years and 5 months old. Concerning the type of technique used, 6 were Von Langenbeck and 4 were Veau-Wardill-Kilner. All patients had no residual fistulas after surgical procedures.
After analysis of the medical records, we verified that 6 patients had their fissure closed in the first surgical period, and other 4 required a second surgical period, due the permanence of oronasal fistula.
When we compared both techniques as to the quantity of surgeries to close cleft palate, we identified that the Von Langenbeck technique presents a better closing index on the first surgical time (67%), when compared to the Veau-Wardill-Kilner technique (50%).
However, when asked about the improvement in hypernasality, 75% of patients operated by means of Veau-Wardill-Kilner technique showed improvement, while for Von Langenbeck technique the number was 67%.

Discussion
This study allowed to evaluate the two primary goals of the palatoplasty techniques, which is the closing of the oral and nasal communication and the normal development of speech.
Other studies in the literature also compared palatoplasty techniques. Williams et al. [7] compared Von Langenbeck and Langenbeck e Furlow techniques, the latter being a technique that uses the principles of zetaplasty to stretch the soft palate. This work also demonstrated a lower presence of fistula after the first surgery by Von Langenbeck (14%), when compared to Furlow technique (23%). However, as in the data obtained in our study, the improvement in hypernasality was better in the group that used Furlow technique (82%) when compared to Von Langenbeck technique (71%).
According to Chen et al. [8], palatoplasty techniques that use the    concepts of pushback to stretch the soft palate has the advantage of better results in relation to the correction of velopharyngeal dysfunction; however, as they generate greater tensions in the tissues, there is a greater chance of appearing fistulas in the postoperative period.
Lage et al. [9] compared two palatoplasty techniques to concepts of pushback (Veau and Furlow) and demonstrated that there is no difference between both techniques on the presence of complications in the postoperative period. Paniagua et al. [10] also found a similar result comparing these two pushback techniques.

Conclusion
Based on the results of this study, we verified that Von Langenbeck palatoplasty technique reduces the chance of residual fistula after the first surgical procedure; however, Veau-Wardill-Kilner technique is more effective in preventing velopharyngeal dysfunction.