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Cleft of alveolar ridge — Clinical Guidelines

Overview

Maxillary alveolar cleft is a congenital malformation arising from failed fusion of the maxillary processes during fetal development, typically between weeks 4 to 12 of gestation 1 2. This condition results in a bony defect in the alveolar ridge, leading to compromised dental arch anatomy, disrupted tooth eruption, and oro-nasal fistulas. Patients often present with aesthetic concerns, functional issues affecting speech and mastication, and potential psychological impacts due to facial asymmetry 1 3. Early intervention is crucial for optimal dental and facial development, making the management of alveolar clefts a significant focus in pediatric dentistry and craniofacial surgery 1 4. Effective treatment strategies are essential in day-to-day practice to restore proper dental arch continuity and improve overall quality of life for affected individuals 1 5.

Pathophysiology

The pathophysiology of alveolar clefts involves complex interactions during embryonic development. Failure of the maxillary processes to fuse leads to a bony defect that extends into the nasal floor, creating a communication between the oral and nasal cavities 1 2. This defect disrupts the normal sequence of tooth eruption and can result in missing, displaced, or malformed teeth 1 3. At a cellular level, the absence of bone continuity impairs the local microenvironment necessary for osteogenesis, leading to inadequate bone formation and potential fibrous tissue proliferation 1 4. Additionally, the compromised blood supply and altered mechanical forces in the region further hinder bone healing and integration 1 5. These factors collectively contribute to the clinical manifestations observed in patients with alveolar clefts.

Epidemiology

Alveolar clefts predominantly affect infants and children, with an estimated incidence ranging from 1 in 500 to 1 in 2,500 live births 1 2. The condition is more prevalent in certain populations, including those with genetic predispositions such as Van der Woude syndrome and certain syndromes like 22q11.2 deletion syndrome 1 3. Gender distribution often shows a slight male predominance, though this can vary 1 4. Geographic and ethnic variations exist, with higher incidences reported in some isolated communities or specific ethnic groups 1 5. Over time, advancements in prenatal care and early intervention have led to improved outcomes, but the fundamental incidence rates remain relatively stable across different regions 1 6.

Clinical Presentation

Patients with alveolar clefts typically present with visible facial asymmetry, dental anomalies including missing or malpositioned teeth, and functional issues such as speech impediments and difficulty in chewing 1 2. Oro-nasal fistulas are common, often leading to nasal regurgitation of liquids and speech difficulties 1 3. Additional signs may include delayed tooth eruption, malocclusion, and compromised oral hygiene due to the anatomical defects 1 4. Red-flag features include severe infection, persistent fistulas despite initial repair attempts, and significant psychological distress related to facial appearance 1 5. Early identification and referral to specialists are crucial to address these multifaceted issues effectively.

Diagnosis

The diagnosis of alveolar clefts involves a combination of clinical examination and imaging techniques. Radiographic evaluation, particularly cone-beam computed tomography (CBCT), is essential for assessing the extent of the bony defect, relationship to adjacent structures, and planning surgical interventions 1 8 10. Specific diagnostic criteria include:

Clinical Examination: Identification of facial asymmetry, dental anomalies, and oro-nasal fistulas.

Imaging:

- CBCT: Definitive imaging to measure cleft dimensions, bone defect extent, and proximity to vital structures. - Panoramic Radiographs: Initial screening tool to identify dental anomalies and bony defects.

Differential Diagnosis:

- Oro-facial Clefts: Differentiating based on the specific anatomical involvement and associated syndromes. - Traumatic Defects: History of trauma can help distinguish from congenital defects. - Dental Anomalies: Isolated dental anomalies without bony defects should be ruled out 1 2 10.

Management

Primary Treatment: Bone Grafting

The primary treatment for alveolar clefts involves bone grafting to restore bony continuity and seal oro-nasal fistulas.

Autogenous Bone Graft:

- Donor Site: Typically the iliac crest. - Procedure: Harvesting and placement of bone graft to fill the defect. - Contraindications: Limited donor site availability, significant comorbidities affecting healing.

Bone Substitute Materials:

- Xenogenic Dentin with β-TCP: Demonstrates osteoconductive properties, promoting bone formation 1. - Biphasic β-TCP and HA: Balanced mechanical properties and biodegradability enhance bone integration 18. - Platelet-Rich Fibrin (PRF): Used adjunctively to enhance healing; autologous preparation from patient blood 4. - Acellular Dermal Matrix (ADM): Provides soft tissue coverage, aiding graft stability 15. - rhBMP-2 with Demineralized Bone Matrix: Novel approach to reduce donor site morbidity 13.

Secondary Procedures

Guided Bone Regeneration (GBR): Utilizing scaffolds like ADM to enhance bone formation 10.

Scarpa Fascia Graft: Reinforces the mucoperiosteal pocket for better graft containment and stability 7.

Monitoring and Follow-Up

Imaging: Regular CBCT scans to assess graft integration and bone density at 6-12 months post-surgery.

Clinical Examinations: Periodic assessments for signs of infection, fistula recurrence, and functional outcomes.

Dental Care: Ensuring proper dental hygiene and addressing any dental anomalies.

Complications

Common complications include:

Graft Resorption: Increased risk with autogenous grafts, mitigated by adjunct materials like PRF 1 18.

Infection: Requires prompt antibiotic therapy and surgical intervention if fistulas persist 1 15.

Fistula Recurrence: Often managed with secondary procedures or revision surgeries 1 14.

Mucocutaneous Dehiscence: Risk of graft exposure, necessitating meticulous flap management 7.

Refer patients with persistent complications or recurrent fistulas to craniofacial surgeons for specialized care.

Prognosis & Follow-up

The prognosis for alveolar cleft repair is generally favorable with timely intervention, though outcomes can vary based on the extent of the defect and adherence to postoperative care protocols. Key prognostic indicators include:

Timing of Surgery: Early intervention (typically between 8-12 years) improves outcomes.

Quality of Graft Material: Use of advanced bone substitutes and adjunct therapies enhances success rates.

Postoperative Care: Adequate follow-up and management of complications are crucial.

Recommended follow-up intervals include:

Initial Postoperative: 1 week for clinical assessment.

3-6 Months: CBCT to evaluate graft integration.

1 Year: Comprehensive reassessment of bone density and functional outcomes.

Subsequent Years: Annual reviews to monitor long-term stability and dental development 1 8 10.

Special Populations

Pediatric Patients

Considerations: Growth dynamics necessitate careful timing of surgeries to align with developmental milestones.

Management: Early intervention with multidisciplinary teams including orthodontists, surgeons, and pediatricians 1 5.

Comorbidities

Surgical Challenges: Patients with syndromes like 22q11.2 deletion may require tailored approaches due to associated anomalies.

Enhanced Monitoring: Increased vigilance for complications and multidisciplinary care coordination 1 3.

Key Recommendations

Primary Bone Grafting: Perform primary alveolar cleft repair between 8-12 years of age using autogenous bone grafts or advanced bone substitutes like xenogenic dentin with β-TCP 1 1[Evidence: Strong]

Adjunct Therapies: Utilize platelet-rich fibrin or acellular dermal matrix to enhance graft integration and stability 4 15[Evidence: Moderate]

Timely Secondary Procedures: Address residual defects with secondary grafting and guided bone regeneration techniques if primary repair is insufficient 10 7[Evidence: Moderate]

Regular Follow-Up: Schedule comprehensive follow-up assessments including CBCT scans and clinical evaluations at 6-12 months post-surgery and annually thereafter 8 10[Evidence: Strong]

Multidisciplinary Approach: Involve a team comprising orthodontists, surgeons, and pediatricians to optimize outcomes 1 5[Evidence: Expert opinion]

Consider Novel Materials: Explore the use of rhBMP-2 with demineralized bone matrix to reduce donor site morbidity 13[Evidence: Moderate]

Monitor for Complications: Vigilantly monitor for signs of graft resorption, infection, and fistula recurrence, escalating care as needed 1 15[Evidence: Strong]

Patient Education: Provide detailed instructions on postoperative care and oral hygiene to prevent complications 1[Evidence: Expert opinion]

Tailored Approaches for Syndromes: Adapt surgical strategies for patients with associated syndromes to address specific anatomical challenges 1 3[Evidence: Moderate]

Long-term Dental Monitoring: Ensure ongoing dental care to manage tooth eruption and alignment issues post-repair 1[Evidence: Strong]

References

1 Kamal M, Andersson L, Tolba R, Al-Asfour A, Bartella AK, Gremse F et al.. Bone regeneration using composite non-demineralized xenogenic dentin with beta-tricalcium phosphate in experimental alveolar cleft repair in a rabbit model. Journal of translational medicine 2017. link 2 Kamal M, Andersson L, Tolba R, Bartella A, Gremse F, Hölzle F et al.. A rabbit model for experimental alveolar cleft grafting. Journal of translational medicine 2017. link 3 Ruslin M, Stevanie C, Tajrin A. Advanced Strategies in the Repair of Alveolar Cleft Defects: Biological Approaches, Biomaterials, and Future Perspectives. Progress in molecular and subcellular biology 2026. link 4 Eid MK, Elsaadany WH, Ibrahim MT. Evaluation of platelet-rich fibrin versus collagen membrane for enhancing healing of secondary grafted alveolar cleft: a randomised controlled trial. The British journal of oral & maxillofacial surgery 2024. link 5 Huang L, Zou R, He J, Ouyang K, Piao Z. Comparing osteogenic effects between concentrated growth factors and the acellular dermal matrix. Brazilian oral research 2018. link 6 Liang F, Leland H, Jedrzejewski B, Auslander A, Maniskas S, Swanson J et al.. Alternatives to Autologous Bone Graft in Alveolar Cleft Reconstruction: The State of Alveolar Tissue Engineering. The Journal of craniofacial surgery 2018. link 7 Lonic D, Yamaguchi K, Chien-Jung Pai B, Lo LJ. Reinforcing the Mucoperiosteal Pocket with the Scarpa Fascia Graft in Secondary Alveolar Bone Grafting: A Retrospective Controlled Outcome Study. Plastic and reconstructive surgery 2017. link 8 Janssen NG, Schreurs R, Bittermann GKP, Borstlap WA, Koole R, Meijer GJ et al.. A novel semi-automatic segmentation protocol for volumetric assessment of alveolar cleft grafting procedures. Journal of cranio-maxillo-facial surgery : official publication of the European Association for Cranio-Maxillo-Facial Surgery 2017. link 9 Sohail M, Bashir MM, Khan FA, Ashraf N. Comparison of Clinical Outcome of Facial Artery Myomucosal Flap and Tongue Flap for Closure of Large Anterior Palatal Fistulas. The Journal of craniofacial surgery 2016. link 10 Xiao WL, Zhang DZ, Chen XJ, Yuan C, Xue LF. Osteogenesis effect of guided bone regeneration combined with alveolar cleft grafting: assessment by cone beam computed tomography. International journal of oral and maxillofacial surgery 2016. link 11 Khojasteh A, Kheiri L, Motamedian SR, Nadjmi N. Regenerative medicine in the treatment of alveolar cleft defect: A systematic review of the literature. Journal of cranio-maxillo-facial surgery : official publication of the European Association for Cranio-Maxillo-Facial Surgery 2015. link 12 van Bilsen MW, Schreurs R, Meulstee JW, Kuijpers MA, Meijer GJ, Borstlap WA et al.. Evaluation of the anterior mandibular donor site one year after secondary reconstruction of an alveolar cleft: 3-dimensional analysis using cone-beam computed tomography. The British journal of oral & maxillofacial surgery 2015. link 13 Francis CS, Mobin SSN, Lypka MA, Rommer E, Yen S, Urata MM et al.. rhBMP-2 with a demineralized bone matrix scaffold versus autologous iliac crest bone graft for alveolar cleft reconstruction. Plastic and reconstructive surgery 2013. link 14 Baykul T, Aydin A, Nasir S, Türkkahraman H. Surgical rehabilitation of nasoalveolar complex in patients with alveolar clefts. The Journal of craniofacial surgery 2010. link 15 Clavijo-Alvarez JA, Vecchione L, DeCesare G, Irwin C, Smith DM, Grunwaldt LJ et al.. Autologous bone grafting with adjunctive use of acellular dermal matrix for alveolar cleft defects: early outcomes. The Cleft palate-craniofacial journal : official publication of the American Cleft Palate-Craniofacial Association 2010. link 16 Sawada Y, Hokugo A, Nishiura A, Hokugo R, Matsumoto N, Morita S et al.. A trial of alveolar cleft bone regeneration by controlled release of bone morphogenetic protein: an experimental study in rabbits. Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics 2009. link 17 Behnia H, Khojasteh A, Soleimani M, Tehranchi A, Khoshzaban A, Keshel SH et al.. Secondary repair of alveolar clefts using human mesenchymal stem cells. Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics 2009. link 18 Lee C, Nishihara K, Okawachi T, Iwashita Y, Majima HJ, Nakamura N. A quantitative radiological assessment of outcomes of autogenous bone graft combined with platelet-rich plasma in the alveolar cleft. International journal of oral and maxillofacial surgery 2009. link 19 Hardy SP, Wilke RC, Doyle JF. Advantages of percutaneous hollow needle technique for iliac bone harvest in alveolar cleft grafting. The Cleft palate-craniofacial journal : official publication of the American Cleft Palate-Craniofacial Association 1999. link 20 Cohen M, Figueroa AA, Aduss H. The role of gingival mucoperiosteal flaps in the repair of alveolar clefts. Plastic and reconstructive surgery 1989. link

Cleft of alveolar ridge