Primary Palate Research Articles

Impact of early cleft lip and palate surgery on maxillary growth in 5- and 10-Year-old patients with unilateral cleft lip and palate: a cross-sectional study

ObjectivesThis study evaluated maxillary growth and dental arch relationships at 5 and 10 years of age in patients with unilateral cleft lip and palate (UCLP) who underwent early cleft lip and palate surgery.Methods28 patients with UCLP who underwent cleft lip surgery in neonatal age and cleft palate surgery at average age of 7 months without orthodontic treatment (intervention group) were measured for intercanine and intermolar distances and for dental arch length. These measurements were compared with those of 30 healthy participants in a control group. Dental arch relationships in the intervention group were evaluated by 5-YO index at 5 years and the GOSLON Yardstick score at 10 years of patients’ age.ResultsPatients in the intervention group had significantly shorter mean intercanine distance and arch length than control patients at both 5 and 10 years of age (p<.001 for all). There were no significant differences in intermolar distance at both 5 (p = .945) and 10 years (p = .105) of patients’ age. The average 5YO index increased from 2.46 to an average GOSLON 10-year score of 2.89 in intervention group.ConclusionIntercanine distance and dental arch length of patients with UCLP are significantly reduced at 5 and 10 years after early cleft lip and palate surgeries compared to the healthy population. Dental arch relationships at 5 and 10 years of patients with UCLP show comparable outcomes to those reported by other cleft centers.Clinical significanceThis study evaluates maxillary growth in UCLP patients 5 and 10 years of age who underwent early primary lip and palate surgery.

Hearing, speech, and language outcomes in school-aged children after cleft palate repair.

Following primary cleft palate repair, individuals face a heightened risk of hearing problems, particularly conductive hearing loss, compensatory articulation disorders (CADs), resonance disorders, delayed speech and language development, and voice disorders. This study aimed to investigate the prevalence and impact of these challenges in children with cleft palate with or without cleft lip (CP± L). This cross-sectional study included 38 children with CP± L aged 5 to 13 years. A comprehensive evaluation involved audiological assessments (audiograms, tympanograms) by an audiologist and speech-language pathology assessments (Thai Speech Parameters for Patients with Cleft Palate, Articulation Screening Test) by speech-language pathologists. The prevalence of hearing loss affected 27.63% of participants (21 out of 76 ears) and majority of cases involved conductive hearing loss. Velar substitution was the most common CAD, followed by nasalized voiced pressure consonants, phoneme-specific nasal air emission, and pharyngeal substitution. A moderate correlation was found between these CAD patterns and hypernasality at the word, sentence, and screening levels (r= 0.44, p< 0.01; r= 0.43, p< 0.01; and r= 0.40, p= 0.01). For summary, the most common type of hearing loss was conductive hearing loss. The predominant CAD pattern was velar substitution. The protocol could be designed to enhance early improvement in hearing and articulation, thereby supporting academic achievement and long-term quality of life.

Worth the Pain? Comparing Pain Scores in Primary Furlow Palatoplasty With and Without Buccal Flap Augmentation.

Pain following primary palatoplasty can adversely affect nutritional and quality of life following primary palatoplasty. The incorporation of buccal flaps during primary cleft palate (CP) repair provides additional tissue to reduce the risk of velopharyngeal insufficiency, though the additional donor site may alter pain levels in the postoperative period. This study sought to compare postoperative pain levels in patients undergoing primary CP repair with or without buccal flaps. A single-institution, retrospective cohort study. An academic children's hospital with an affiliated comprehensive cleft care team. Patients age 18 months or less with cleft palate undergoing primary palatoplasty from 2016 to 2021 were included. Patients were stratified by the number of buccal flaps utilized during repair. Primary outcome was 24-h postoperative pain score, measured using the FLACC pain scale. Secondary outcome was 24-h postoperative narcotic use, measured in morphine milligram equivalents (MME). A total of 106 patients (53 without buccal flaps, 53 with 1 + buccal flaps) were included. There was no significant difference in postoperative pain scores between the groups (p > 0.9). Both groups had similar postoperative narcotic utilization (p = 0.8). This study demonstrates no significant difference in postoperative pain levels or narcotic utilization between patients undergoing primary Furlow palatoplasty with or without buccal flaps. This information can help address parental concerns regarding pain in the context of a larger donor site for patients undergoing primary palatoplasty with buccal flaps. Larger, multi-institutional randomized trials are needed to confirm these findings.

Single-cell transcriptome and chromatin accessibility mapping of upper lip and primary palate fusion.

Cleft lip and/or primary palate (CL/P) represent a prevalent congenital malformation, the aetiology of which is highly intricate. Although it is generally accepted that the condition arises from failed fusion between the upper lip and primary palate, the precise mechanism underlying this fusion process remains enigmatic. In this study, we utilized transposase-accessible chromatin sequencing (scATAC-seq) and single-cell RNA sequencing (scRNA-seq) to interrogate lambdoidal junction tissue derived from C57BL/6J mouse embryos at critical stages of embryogenesis (10.5, 11.5 and 12.5 embryonic days). We successfully identified distinct subgroups of mesenchymal and ectodermal cells involved in the fusion process and characterized their unique transcriptional profiles. Furthermore, we conducted cell differentiation trajectory analysis, revealing a dynamic repertoire of genes that are sequentially activated or repressed during pseudotime, facilitating the transition of relevant cell types. Additionally, we employed scATAC data to identify key genes associated with the fusion process and demonstrated differential chromatin accessibility across major cell types. Finally, we constructed a dynamic intercellular communication network and predicted upstream transcriptional regulators of critical genes involved in important signalling pathways. Our findings provide a valuable resource for future studies on upper lip and primary palate development, as well as congenital defects.

Primary dentition palate: genetic and environmental influences explored

Primary dentition palate: genetic and environmental influences explored

Early Cleft Palate Repair is Associated With Lower Incidence of Velopharyngeal Insufficiency Surgery.

The timing of primary repair in nonsyndromic cleft palate remains controversial. Recent evidence suggests earlier repair is associated with a lower incidence of velopharyngeal insufficiency (VPI). The authors aim to evaluate these findings in a large cohort study using causal inference. All nonsyndromic cleft palate repairs in California were extracted between 2000 and 2021 from the California Health Care Access and Information (HCAI) database. Cases were linked with VPI surgery following cleft palate repair based on unique identifiers. The main outcome measure was incidence of VPI surgery evaluated with propensity score matching. Early cleft palate repair was defined as <7 months of age versus traditional cleft palate repair at >11 months of age. Standardized mean differences (SMD) were measured before and after matching for potential confounders including sex, race, payer, and distance from patient home to hospital. In all, 52,007 cleft palate repairs were included, of which 12,169 (23.3%) were repaired early and 39,838 (76.7%) were repaired traditionally. Early cleft palate repairs underwent VPI surgery in 1.2% (13/1,000) of cases, compared with 6.1% (61/1000) in the traditional repair cohort. Post-matching, the average treatment effect of early repair was a 6.3% reduction in VPI surgery (P<0.001, 95% CI -6.3, -5.4%). All covariate SMDs were <|0.1| after matching. Our cohort study demonstrates a significantly reduced incidence of VPI surgery in children with primary cleft palate repair <7 months of age. Craniofacial centers should consider early cleft palate repair in appropriate patients.

A Sustainable Solution for Reducing Draping Waste in Cleft Surgeries.

This study aims to reduce the waste generated from primary cleft lip and/or palate (CL/P) repair. A retrospective chart review examined a single surgeon's experience with CL/P repair using standard draping technique and reduced draping technique. Fisher's exact tests were performed comparing complication rates between techniques. All procedures were conducted at a single academic medical center under the care of a board-certified pediatric plastic surgeon and fellowship-trained pediatric anesthesiologists. The study included all patients ≤ 24 months of age who underwent primary CL/P repair using a reduced draping technique at the senior author's institution. An equivalent number of patients who underwent CL/P repair by the senior author immediately prior to implementation of the reduced draping technique were included for comparison. Patients undergoing CL/P repair before the change in technique were draped using the standard CL/P draping. The senior author then switched to using a reduced draping on all CL/P repairs afterwards. Weights and costs of both draping sets were obtained and differences calculated. A manual chart review was performed to assess rates of accidental intraoperative extubation, postoperative infection, fistula formation, and wound dehiscence. The implementation of a reduced draping technique resulted in a 530 gram weight savings and $7.49 cost savings per procedure. Fisher's exact tests revealed no statistically significant differences in complication rates except for oral mucosal dehiscence, which was lower in the reduced draping group. Reduced draping in CL/P repairs significantly reduces operative waste without compromising surgical outcomes.

Postoperative respiratory difficulties following primary cleft palate repair in infants with Robin sequence versus isolated cleft palate: A retrospective study

The study aimed to: (1) compare the occurrence of postoperative respiratory difficulties (PRD) following primary cleft palate repair (CPR) in infants with an isolated cleft palate (iCP) and infants with Robin sequence (RS), and (2) describe the possible benefit of preoperative analysis with palatal plate in infants with RS.All consecutive infants with an iCP and infants with RS who underwent CPR between January 2009 and June 2022 in the Wilhelmina Children's Hospital were retrospectively reviewed.A total of 127 infants were included of which 74 infants with an iCP and 53 infants with RS. The group of infants with RS consisted of 35 infants with non-isolated RS (niRS) and 18 infants with isolated RS (iRS). Significant more PRD were seen in infants with RS compared to infants with an iCP (14/53 versus 9/74; p = 0.04). Especially infants with niRS have a significant higher risk of developing PRD in comparison with infants with an iCP (OR = 4.16, 95% CI [1.17–15.99], p = 0.031). The preoperative palatal plate screening in infants with RS (n = 25) did not show abnormalities and had no effect on the perioperative policy.Within the limitations of this study it seems that infants with niRS are more prone to develop PRD following primary CPR when compared to infants with iRS or an iCP. No clear benefit was found in postponing surgery until 12 months or later in infants with RS to avoid PRD. The preoperative palatal plate screening did not demonstrate signs of UAO in infants with RS that developed PRD. These findings suggest that preoperative analysis with palatal plate has a low predictive value.

Cranial anatomy of the Triassic rhynchosaur Mesosuchus browni based on computed tomography, with a discussion of the vomeronasal system and its deep history in Reptilia

Abstract The stem lineage of Archosauria is populated by a diverse fossil record that remains notably understudied relative to the crown clade. Prominent among these specimens is a beautifully preserved skull of the early mid-Triassic rhynchosaur Mesosuchus browni [Iziko South African Museum (SAM) 6536], whose phylogenetic position has considerable influence on patterns of pan-archosaurian cranial evolution. We used high-resolution, micro-computed tomography to re-examine the anatomy of this specimen, building on previous studies that were either limited to external observations or restricted to the braincase. A digital segmentation of the cranial elements and primary neurovascular canals of SAM-PK-6536 allows for expanded character scoring and constitutes a foundation for future comparative insights. Our data support the phylogenetically oldest instance of a pneumatized maxilla in a pan-archosaur, bringing the record of antorbital pneumatization into closer alignment with that of the neurocranium. The nasal cavity and primary palate of Mesosuchus includes a complex septomaxilla, a novel element anterior to the vomer, and is likely to have supported a well-developed vomeronasal system. The evolution of this system is discussed in terms of both phylogenetic pattern and how the skeletal architecture of Mesosuchus and other fossils could inform the signalling dynamics that pattern the vomeronasal system during development.

Review of Current Techniques of Cleft Palate Repair Concerning Palatal Innervation: A Preliminary Assumption.

To highlight the possible surgical steps that could affect the neural supply of soft palate and velopharyngeal sphincter during Furlow palatoplasty and posteriorly-based myo-mucosal buccal flaps in patients with persistent velopharyngeal insufficiency after primary cleft palate repair. Institution-based retrospective study. Academic Medical Center. Non-syndromic patients with persistent hypernasality (after primary cleft palate repair) who had Furlow palatoplasty or posteriorly-based buccal myo-mucosal flaps and were followed up for at least 60 months after the secondary surgery. All patients were examined using a fiberoptic endoscopy, the movement of components of the velopharyngeal sphincter: soft palate, and lateral pharyngeal walls were traced on the monitor and given a score from 0-4. The pattern of VPS closure was reported whether coronal, circular, or sagittal for each case. Patients' characteristics, auditory perceptual assessment, the severity of hypernasality, intraoperative lengthening of the palate, and operative complications were recorded. At postoperative (at least 60 months) evaluation of the patients statistically non-significant differences were reported when comparing the pre-versus post-operative auditory perceptual assessment following both procedures (P value ≥0.05). A greater tendency towards improvement was noticed with BF but was non-significant. The nerve supply of the palate could be jeopardized by many techniques of primary or secondary repair of the cleft palate leaving behind a deceiving intact but weak poor-functioning palate. All efforts should be made to provide more neural-preservation techniques in primary/secondary repair of the cleft palate. Further wide-scale research is essential to have final clear conclusions.

Frequency of fistula in patients operated for primary cleft palate repair in a tertiary care center.

Objective: To determine the frequency of fistula in patients undergoing primary cleft palate repair. Study Design: Descriptive Case Series study. Setting: Burns and Plastic Surgery Center, HMC, Peshawar. Period: February 2023 to December 2023. Methods: Patient of both genders males and females undergoing primary cleft palate repair were included in the study with age ranging from 9 to 18 months age excluding patients with comorbids and syndromic patients. Non-probability consecutive sampling was adopted. The data was acquired from patients and hospital record and analyzed with statistical package for social sciences (SPSS). Results: Our study shows that among 169 patients, mean age was 10 months with SD ± 5.11. 100(59%) patients were male and 69(41%) patients were female. More over 3(2%) patients had fistula while 166(98%) patients didn’t had fistula. Conclusion: In this study we observed an internationally acceptable frequency of post-palatal repair fistula for primary cleft palate in our study population.

Pattern of velopharyngeal valve closure in patients with cleft palate after primary cleft palate repair: A cross-sectional nasoendoscopic analysis

ABSTRACT Background: The velopharyngeal valve (VPV) consists of the velum, lateral pharyngeal walls, and posterior pharyngeal walls. Velopharyngeal (VP) closure is required during attempted phonation, deglutition, and sucking, and serves to prevent nasal regurgitation of fluids or solids that are normally delivered to the oropharynx. Objectives: This study aimed to identify the patterns of VPV closure in children with cleft palate (CP) who had palatal repair done and to determine the relationship between surgical technique and pattern of closure. Patients and Methods: This study was conducted in the nasoendoscopy room of the Orofacial Cleft Clinic, Lagos University Teaching Hospital. All patients with nonsyndromic cleft lip and palate or isolated CP who had palatal repair done at age 12 months and above with either von Langenbeck, Bardach, or Furlow’s techniques were included in this review. All patients were examined using a flexible fiber-optic nasoendoscope. Results: There were 35 patients who had nasoendoscopy done and met the inclusion criteria. The most common pattern of closure of the VP mechanism in patients examined by nasoendoscopy was circular (48.6%), followed by coronal (37.1%). von Langenbeck’s technique had the highest frequency in all patterns of closure though this was not statistically significant (P = 0.47). Both von Langenbeck and Bardach techniques had both coronal and circular as their most common closure patterns, while Furlow’s had the circular as the most common pattern of closure. Conclusion: The most common pattern of closure of the VP mechanism in patients who had CP repair in this study was circular and there was no apparent relationship between the surgical technique of repair and pattern of closure.

Does Primary Cleft Palate Repair by Furlow Z-Plasty Technique With a Buccinator Myomucosal Flap Change Speech and Middle Ear Outcomes?

Children with repaired cleft lip and palate may present with middle ear effusion and disturbed speech due to velopharyngeal (VP) insufficiency. Furlow Z-palatoplasty with a buccinator myomucosal flap is one of the effective surgical techniques for primary cleft palate repair and lengthening of the palate. This study aimed to evaluate the effect of Furlow Z-palatoplasty with buccal myomucosal flap as a primary cleft palate repair technique on the VP function during speech and the Eustachian tube function. Forty patients with non-syndromic cleft lip and palate aged 3 to 7 years surgically repaired with Furlow palatoplasty with a buccinator myomucosal flap were assessed. Perceptual speech assessment, nasopharyngoscopic examination, otoscopic examination, and tympanometry were done for all patients to assess the speech and middle ear function. The percentage of mild hypernasality was significant in 22.5% of children with repaired cleft lip and palate, while 77.5% showed no hypernasality. Speech intelligibility was normal in 77.5% and mildly affected in 22.5% of children with repaired cleft palate. Compensatory misarticulations were recorded in 12.5% of children. Nasopharyngoscopic examination revealed adequate VP closure in 75% of children with repaired cleft palate. Twenty-five percent of children with repaired cleft lip and palate had middle ear effusion and required myringotomy with insertion of tympanostomy tubes. Primary cleft palate repair with Furlow Z-palatoplasty with buccal myomucosal flap had beneficial effects on speech outcomes. It was associated with a low prevalence of middle ear effusion, and a low number of tympanostomy tubes were needed.

Cleft Lip and Palate Surgery at a Rural African Hospital: A 13-Year Experience From Western Kenya.

Most studies on the treatment of cleft lip and palate (CLP) in low-income and middle-income countries have reported on the experience of urban centers or surgical mission trips to rural locations. There is a paucity of literature on the experience of local teams providing orofacial cleft surgery in rural Sub-Saharan Africa. This study reports the efficacy and cost-effectiveness of cleft surgery performed by an all-local team in rural Kenya. A retrospective chart review was performed on all patients who received CLP repair at Kapsowar Hospital between 2011 and 2023. Information regarding patient age, sex, cleft etiology, surgical management, and home location was retrieved. For the most recent year of study (2023), the authors performed a financial audit of all costs related to the performance of unilateral cleft lip surgery. Descriptive statistics were performed. The authors identified 381 CLP surgeries performed on 311 patients (197 male, 63.3%). The most common etiology of the cleft was left unilateral (28.3%). The average age of primary lip repair decreased from 46.3 months in 2008 to 2009 to 20.2 months in 2022 to 2023 ( P <0.001). The average age of primary cleft palate repair decreased from 38.0 months in 2008 to 2009 to 25.3 months in 2022 to 2023 ( P <0.001). Patients traveled from 23 districts to receive treatment. Age of treatment was not different when distinguished by sex, county poverty level, or travel time from the hospital. The total costs associated with cleft lip repair was $201.6. Adequately staffed hospitals in rural locations can meaningfully address a regional CLP backlog more cost-effectively than surgical mission trips.

Longitudinal Speech and Fistula Outcomes Following Primary Cleft Palate Repair at a Single Institution

Introduction Fistula formation and velopharyngeal insufficiency (VPI) are complications of cleft palate repair that often require surgical correction. The goal of the present study was to examine a single institution's experience with cleft palate repair with respect to fistula formation and need for surgery to correct velopharyngeal dysfunction. Methods Institutional review board approval was obtained. Patient demographics and operative details over a 10-year period were collected. Primary outcomes measured were development of fistula and need for surgery to correct VPI. Chi-square tests and independent t tests were utilized to determine significance (0.05). Results Following exclusion of patients without enough information for analysis, 242 patients were included in the study. Fistulas were reported in 21.5% of patients, and surgery to correct velopharyngeal dysfunction was needed in 10.7% of patients. Two-stage palate repair was associated with need for surgery to correct VPI (P = 0.014). Furlow palatoplasty was associated with decreased rate of fistula formation (P = 0.002) and decreased need for surgery to correct VPI (P = 0.014). Conclusion This study reiterates much of the literature regarding differing cleft palate repair techniques. A 2-stage palate repair is often touted as having less growth restriction, but the present study suggests this may yield an increased need for surgery to correct VPI. Prior studies of Furlow palatoplasty have demonstrated an association with higher rates of fistula formation. The present study demonstrated a decreased rate of fistula formation with the Furlow technique, which may be due to the use of the Children's Hospital of Philadelphia modification. This study suggests clinically superior outcomes of the Furlow palatoplasty over other techniques.

Rhinomanometry evidence in children treated by Furlow’s palatoplasty for velopharyngeal insufficiency correlated to cleft palate

Background: Speech surgery outcomes for velopharyngeal insufficiency (VPI) are difficult to quantify. We investigated the correlation between objective measurements of nasal emission and speech assessment ratings in children undergoing Furlow palatoplasty for the treatment of cleft-related VPI. Methods: A total of 20 patients with VPI after primary cleft palate repair were recruited for Furlow’s palatoplasty. All participants completed rhinomanometry (RM) and speech evaluation scored by two blinded speech-language pathologists. Pre- and postoperative results were compared using the paired t test. Statistical significance was set for P values &lt; 0.05. Correlation tests were performed to identify the correspondence of the RM findings with the speech assessment ratings. Results: RM quantified a reduction of the expiratory flow postoperatively. The sensitivity for the RM was 1.00 and the specificity 0.95. The mean of the pre- versus postoperative values was 0.52 ± 0.43 (range: 0.14–1.69) versus 0.51 ± 0.54 (range: 0.18–1.8), P &lt; 0.05. These values confirmed a reduction of the nasal emission postoperatively, which was consistent with the speech assessment reports. Conclusions: Combined subjective and objective measurements can complete the clinical assessment of these patients. RM measurements confirmed the velopharyngeal changes achieved with speech surgery.

Update on using buccal myomucosal flaps for patients with cleft palate and velopharyngeal insufficiency: primary and secondary interventions.

This review aims to examine the indications and anatomical circumstances for when to optimally incorporate buccal myomucosal flaps (BMFs) into palatal surgical reconstruction. Studies examining outcomes following primary cleft palate repair with incorporation of BMF have demonstrated excellent speech outcomes and low rates of fistula. Furthermore, some reports cite an association of buccal flap use with reduced midface hypoplasia and the need for later orthognathic surgery. When used for secondary speech surgery, BMFs have been shown to lead to speech improvements across multiple outcome measures. Advantages of BMF techniques over conventionally described pharyngeal flap and pharyngoplasty procedures include significant lengthening of the velum, favorable repositioning of the levator muscular sling, and lower rates of obstructive sleep apnea. Although the published data demonstrate excellent outcomes with use of BMFs for primary and secondary palatal surgery, there are limited data to conclude superiority over the traditional, more extensively investigated surgical techniques. The authors of this review agree with the evidence that BMF techniques can be useful in primary palatoplasty for congenitally wide clefts, secondary speech surgery for large velopharyngeal gaps, and/or in individuals with a predisposition for airway obstruction from traditional approaches.

Same-day Discharge for Cleft Palate Repair: A Single-Surgeon Retrospective Analysis.

To evaluate the safety of same-day discharge for patients undergoing primary cleft palate repair. Single-surgeon retrospective review. Tertiary care institution. 40 consecutive patients that underwent primary cleft palate repair by a single surgeon from September 2018 to June 2023. Same-day discharge versus overnight admission after primary palatoplasty. 30-day readmission, reoperation, wound and all-cause complication rate and 1-year fistula incidence. Of 40 total cases, 20 patients were discharged on the same calendar day and 20 patients were admitted for overnight stay following primary cleft palate repair. In the same-day discharge group, readmission incidence was 10%(n = 2), wound complication incidence was 5%(n = 1), and postoperative complication incidence was 15%(n = 3). In comparison, patients admitted overnight had a readmission incidence of 5%(n = 1, P = 1.00), wound complication incidence of 10%(n = 2, P = 1.00), and postoperative complications of 20%(n = 4, P = 1.00) No patients had 30-day reoperations or fistulas at 1 year. A higher proportion of admitted patients held a preoperative diagnosis of unilateral cleft palate and alveolus (Veau 3) as compared to patients discharged on the same day (P = .019). During the postoperative hospital course, admitted patients received significantly more oxycodone at median of 2 doses (IQR 1.00-3.75) and acetaminophen at a median of 4 doses (IQR 3.00-5.00) than patients with same-day discharge with a median of 1 dose (IQR 0.00 -1.00, P < .001). In a low-risk patient population, same-day discharge following primary cleft palate repair may be safely undertaken and result in similar short-term outcomes and 1-year fistula incidence as patients admitted for overnight stay.

Incidence of Velopharyngeal Insufficiency after Primary Cleft Palate Repair: A 27-Year Assessment of One Surgeon's Experience.

Background Velopharyngeal insufficiency (VPI) is a major complication of cleft palate repair. The purpose of this study was to evaluate the incidence and predictive factors of VPI after cleft palate repair based on 27 years of one surgeon's experience. Methods Medical records were retrospectively reviewed for 652 patients who underwent cleft palate repair between 1995 and 2021. After exclusion of those with other syndromes or developmental disorders, the study included 374 patients with sufficient follow-up until the age of 4 years, when language evaluation was possible. VPI status was categorized through subjective and objective tests into normal, VPI, and borderline. We analyzed potential differences in VPI incidence by multiple factors. Factors with significance were analyzed to confirm the relationships between subvariables. Results Of the 374 patients, 311 (83.2%) exhibited normal pronunciation, 51 (13.6%) had VPI, and 12 (3.2%) were borderline. Primary cleft palate repair performed after 18 months was associated with a higher incidence of VPI than repair conducted before 18 months ( p = 0.005). The incidence of VPI was higher in cases of submucous cleft palate than in the other types based on the Veau classification ( p = 0.011). However, in the multivariable analysis, only the submucous type showed statistically significant results ( p = 0.026). Conclusion A total of 374 people underwent primary cleft palate repair, and 13.6% of those with VPI required secondary therapy. The incidence of VPI was relatively high among patients with primary cleft palate repair after 18 months and patients with submucous cleft palate.

Retinoic Acid Upregulates METTL14 Expression and the m6A Modification Level to Inhibit the Proliferation of Embryonic Palate Mesenchymal Cells in Cleft Palate Mice.

Cleft palate only (CPO) is one of the most common craniofacial birth defects. Environmental factors can induce cleft palate by affecting epigenetic modifications such as DNA methylation, histone acetylation, and non-coding RNA. However, there are few reports focusing on the RNA modifications. In this study, all-trans retinoic acid (atRA) was used to simulate environmental factors to induce a C57BL/6J fetal mouse cleft palate model. Techniques such as dot blotting and immunofluorescence were used to find the changes in m6A modification when cleft palate occurs. RNA-seq and KEGG analysis were used to screen for significantly differentially expressed pathways downstream. Primary mouse embryonic palate mesenchymal (MEPM) cells were successfully isolated and used for in vitro experimental verification. We found that an increased m6A methylation level was correlated with suppressed cell proliferation in the palatine process mesenchyme of cleft palate mice. This change is due to the abnormally high expression of m6A methyltransferase METTL14. When using siRNAs and the m6A methyltransferase complex inhibitor SAH to interfere with the expression or function of METTL14, the teratogenic effect of atRA on primary cells was partially alleviated. In conclusion, METTL14 regulates palatal mesenchymal cell proliferation and cycle-related protein expression relies on m6A methylation modification, affecting the occurrence of cleft palate.