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Original Article  |  Open Access  |  23 Apr 2023

Alveolar cleft reconstruction with vomerine bone: two surgical procedures in one step: a case series

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Plast Aesthet Res 2023;10:16.
10.20517/2347-9264.2022.57 |  © The Author(s) 2023.
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Abstract

Aim: Iliac crest (IC) is the most common source of bone for alveolar cleft repair, as it allows for harvesting a large amount of cancellous bone with a high rate of favorable outcomes. Its drawback is the donor-site morbidity. We propose a new technique for alveolar cleft grafting using vomerine bone (VB), which, through bone grafting, reconstructs the alveolus with the VB and simultaneously corrects the nasal septum deviation.

Method: We performed 18 alveolar reconstructions with VB in patients with a small bony defect and septal deviation, which would benefit from septoplasty. A matched control group with IC bone grafting was selected. Panoramic X-rays were used for vertical assessment of ossification with the Bergland scale and CT scans for the evaluation of the thickness of the grafted area in the VB and IC groups and compared with an independent samples T-test. A paired T-test compared angular measurements of the septal deviation pre- and post- vomerine grafting.

Results: All grafts healed uneventfully, with no complications at the donor site and respiratory function was improved. There was no statistically significant difference in ossification height between VB and IC, the alveolar thickness at the occlusal and middle third was higher with IC. Septal deviation was reduced significantly.

Conclusion: Alveolar graft from VB seems to be a viable alternative to IC in patients who present with a mild bony alveolar defect in addition to septal deviation, allowing combined procedures while reducing the morbidity of the donor site.

Keywords

Alveolar cleft, bone graft, vomerine bone, septoplasty

INTRODUCTION

Alveolar cleft treatment is one of the most controversial topics in cleft lip and palate surgery. Many different techniques and timings have been proposed in order to obtain the best ossification of the alveolar cleft, ranging from primary periosteoplasty (PPP) to early secondary gingivoalveoloplasty (esGAP)[1], from primary bone grafting (PBG) to secondary bone grafting (SBG). The goal of the treatment is to supply bone for erupting teeth and periodontal support for the teeth adjacent to the cleft. SBG is a well-established technique to treat alveolar bone defects, according to the original description by Boyne and Sands[2]. The procedure is classified as early secondary if done between the ages of 2-5 years, intermediate secondary if done between the ages of 6-13 years in the late mixed dentition, or late secondary (also called tertiary) if done from adolescence onward, after the eruption of permanent teeth in the cleft area[3]. In our center, PBG was never performed, given the evidence of sagittal and especially vertical maxillary growth disturbances that occur after this procedure, as demonstrated in the Eurocleft study[4]. Alveolar bone grafting should be performed at the correct timing for optimal outcomes before the eruption of the permanent maxillary canine[5] or lateral incisor[6]. The timing considered ideal for grafting is when the unerupted lateral incisor root (canine if the lateral is missing) has reached one-half to two-thirds of development[7] or when the crowns of the erupting permanent teeth are covered by a thin shell of bone[8-9]. For late secondary cases, the procedure was done in patients who had a previous unsuccessful SBG or esGAP without a complete ossification, when the patient was ready to receive implant surgery or for orthodontic movement of the teeth in the cleft area. It is well known that late grafts do not achieve ideal alveolar height restoration as that occurs in earlier grafting, where bone remodeling is enhanced by the stimulating effect of the migrating teeth.

The goal of alveolar cleft grafting is to fill the defect with cancellous bone, which allows a faster healing process, and to reconstruct the nasal floor with cortical bone in order to restore the superior wall and resist the contraction of the overlying soft tissue as it heals. By resisting these contractile forces, the bone graft has a better chance to maintain its volume and potentially reduces the need for an additional graft. Many different donor sites have been proposed over time. IC is the most popular choice for SBG because it allows for harvesting a cortical segment to reconstruct the nasal floor and a large amount of cancellous bone to fill the defect[10].

Another source of membranous bone that has been utilized in alveolar cleft grafting is mandibular symphysis; harvesting from the mandible has the advantage of the use of the same operative field, no visible scar, and decreased postoperative pain[11]. The mandible can provide adequate bone volume for alveolar grafting even from the retromolar region[12].

Calvaria and tibia have been used by some authors as a source of cortical and cancellous bone[13]. Rib has also been utilized to close the alveolar cleft; however, it is considered to have limited indication due to its donor site morbidity, including visible scarring and pain. Rib grafts have also been criticized for the quality of regenerated bone with difficulties in orthodontic tooth movement[14]. In our Center, we traditionally perform bone graft harvesting cortical and cancellous bone from IC and it is still the gold standard.

We present a case series of alveolar reconstruction using vomerine bone. The idea behind the procedure was to couple the bone graft with the correction of the deviation of the nasal septum, solving at the same time respiratory problems that typically concern cleft patients and reconstructing the alveolar defect using the bone of the vomer. To our knowledge, this bone source has never been used before for alveolar reconstruction in growing patients.

METHODS

This study was conducted following the ethical principles outlined in the Declaration of Helsinki. Since 2015, at the Smile House in San Paolo Hospital of Milan, we have performed alveolar grafting with VB in all the UCLP patients with a clinically significant septal deviation when the alveolar bone defect is small enough to receive a complete reconstruction with this bone. A very small defect was not considered worthy of a major bone harvest, as IC.

The presence of a septal deviation was confirmed with a physical examination, with panoramic X-ray and CBCT. We deemed possible the reconstruction of defects that are no wider than 1 cm at the nasal floor and 2-3 mm at the lower alveolar level. Mucoperiosteal flaps are elevated on the palate and vestibular surfaces of the maxillary segments. Bone stumps of the alveolar cleft are exposed after reflection flaps. Nasal floor is released from the inferior attachments and elevated [Figures 1 and 2]. The excess tissue is trimmed in order to raise the floor as high as possible and then sutured in place. When construction of the watertight nasal floor is completed, the area is ready to receive the bone graft [Figures 3 and 4].

Alveolar cleft reconstruction with vomerine bone: two surgical procedures in one step: a case series

Figure 1. Schematic drawing of local condition at the time of bone graft.

Alveolar cleft reconstruction with vomerine bone: two surgical procedures in one step: a case series

Figure 2. Schematic drawing of alveolar cleft after filling with bone.

Alveolar cleft reconstruction with vomerine bone: two surgical procedures in one step: a case series

Figure 3. Schematic drawing with flaps sutured.

Alveolar cleft reconstruction with vomerine bone: two surgical procedures in one step: a case series

Figure 4. Intraoperative picture of alveolar cleft after elevation and closure of nasal floor.

Harvesting VB can be done with direct visualization or with endoscopic control, the same way septoplasty is performed. We used a hemitransfix incision in all cases according to the standard septoplasty technique. After a wide subpericondral-subperiostal dissection of the septum, in both cartilagineous and bony areas, we harvested the vomer keeping intact the perpendicular plate of the ethmoid bone [Figure 5]. The trick is to harvest bone fragments as wide as possible to reconstruct the alveolar walls with one-piece fragments. A single fragment of cortical bone is placed to reconstruct the nasal floor, and then small bone particles are densely packed into the cleft (same as done with cancellous bone when IC is the source of graft) [Figures 6 and 7]. We generally were able to harvest a single piece of 1 cm of extension.

Alveolar cleft reconstruction with vomerine bone: two surgical procedures in one step: a case series

Figure 5. Schematic drawing of the area of septal dissection for access to vomerine bone and harvest through hemitransfix incision.

Alveolar cleft reconstruction with vomerine bone: two surgical procedures in one step: a case series

Figure 6. Intraoperative picture of alveolar cleft after filling inlay with vomerine bone.

Alveolar cleft reconstruction with vomerine bone: two surgical procedures in one step: a case series

Figure 7. Intraoperative picture of alveolar cleft after coverage onlay with vomerine bone.

We performed 18 bone grafts with this technique, with a wide range in age of the patients (7.3-17.2 years, average 11.4). The sample included nonhomogenous cases, both unilateral complete cleft lip and palate patients and cleft lip and alveolus patients, previously treated in different centers. In detail, eight patients had received a primary treatment in our Center, with an all-in-one closure of lip, nose, soft and hard palate without any alveolar repair. Those patients had a primary cartilagineous septal repositioning.

Ten patients were treated in other centers. Six of them underwent a multi-stage closure of the cleft without any alveolar treatment, and four had already received surgery for alveolar restoration with a relatively poor outcome with only a small amount of bone bridging the cleft, therefore needing a bone augmentation of the existing bridge. No more information was available for patients coming from different centers than ours. We selected the patients who had a septal deviation with subsequent stenosis of the nasal fossa in order to improve nasal function. Of these patients, 16 had sufficient records to allow for the assessment of the quality of ossification.

A sample of patients subjected to traditional IC SBG was matched for age and cleft type and severity pre-grafting (no pre-graft clefts wider than 1 cm at the nasal floor and 2-3 mm at the lower alveolar level were considered) to be used as a control sample. The number of patients was too small to allow matching for gender or for cleft side.

Therefore, two samples were considered. The first sample consisted of 16 non-syndromic unilateral cleft lip and palate patients who underwent SBG with VB. They were treated according to the anatomical limits described by the senior surgeon (L.A.). The average age at the time of vomer SBG was of 11.4 ± 2.6 years. The second sample consisted of nine non-syndromic unilateral cleft lip and palate patients who underwent alveolar bone grafting from IC operated on by the same surgeon (L.A.). The sample was matched for preoperative width. The average age at the time of alveolar bone grafting was 10.4 ± 1.2 years.

We standardized the radiological follow-up of these patients with a panoramic X-Ray at 3 months, a panoramic X-Ray and CBCT at 1 year postoperatively. After a postop follow-up of approximately one year, we may presume there will be minimal change in the volume of the graft over the long term[15]. Evaluation on panoramic radiographs included two parameters: alveolar bridging and nasal ossification. The reliability of the use of panoramic radiographs instead of periapical films was demonstrated previously[16]. Alveolar bridging was assessed using a modified Bergland’s scoring system[5,16]. Type I (score 1): complete ossification of the cleft with normal alveolar reconstruction. Type II (score 2): interdental septal height more than three-quarters of the normal height. Type III (score 3): ossification less than three-quarters of the normal height. Type IV (score 4): ossification limited to a bridge or no ossification at all.

Nasal area ossification was given three different qualitative scores by the authors, as visible on the panoramic radiographs. Type I (score 1): flat symmetrical nasal floor. Type II (score 2): slightly asymmetrical notched nasal floor. Type III (score 3): severely asymmetrical notched nasal floor. Type IV (score 4): incomplete nasal floor[16].

Alveolar cleft thickness was also quantitatively evaluated on computed tomographic images and three-dimensional reconstructions of the maxilla. The quantitative analysis provided both absolute normalized measurements and ratios of the affected side versus the non-affected side. To compare cleft and non-cleft sides, the method from Meazzini et al. was adopted: a midline running through the center of the cervical vertebrae and the airways was drawn, and the thinnest area on the cleft side and its mirror section on the noncleft side was selected[17]. Panoramic radiograph for evaluation of septal deviation was already used with reliable results in a study for identification of the more suitable nostril for nasotracheal intubation[18].

Septal deviation pre- and post-grafting was assessed by calculating the angle between a line drawn through the septum and a line drawn across the infraorbital points (the lowest point of the infraorbital borders) [Figure 8]. Differences between ossification in IC and in VB grafting were compared with an independent sample T-test, setting P value at 0.05. Differences between septal deviation pre-surgery and post-VB grafting were compared with a Paired T-test, setting P value at 0.05.

Alveolar cleft reconstruction with vomerine bone: two surgical procedures in one step: a case series

Figure 8. Method used to point out the areas of comparison between the cleft and non-cleft sides: red line, the midline passing through the cervical vertebra and the airway; green lines, the line passing through the thinnest section of the alveolar cleft and its specular line on the noncleft side (θ = θ′). Meazzini et al., Plast Reconstr Surg, 2016[17].

RESULTS

Two examiners repeated all measurements. The weighted kappa values, for inter-examiner reproducibility, demonstrated good agreement with an average weighted kappa coefficient of 0.88 (95%CI: 0.79-1.00) for Bergland ossification scores, almost perfect agreement with an average weighted kappa coefficient of 0.91 (95%CI: 0.82-1.00) for CT evaluation of the thickness of ossification and good agreement with an average weighted kappa coefficient of 0.92 (95%CI: 0.84-1.00) for the inclination of the septum. Vomer grafting allowed for good nasal and alveolar ossification. All the grafts healed uneventfully, with good ossification and bridging across the cleft and without any complications at the donor site. An adult patient with a minimal bony defect in height and a moderate septal deviation underwent a VB graft with subsequent implant rehabilitation, a symmetrical nasal floor and the correction of the septal deviation [Figures 9 and 10].

Alveolar cleft reconstruction with vomerine bone: two surgical procedures in one step: a case series

Figure 9. Patient M.S. Preoperative panoramic X-Ray, showing the alveolar area with a minimal bony defect in height and a moderate septal deviation.

Alveolar cleft reconstruction with vomerine bone: two surgical procedures in one step: a case series

Figure 10. Patient M.S. Postoperative control, showing the restoration of a normal alveolar height, with subsequent implant rehabilitation, a symmetrical nasal floor and the correction of the septal deviation.

In a case with a narrow alveolar cleft and a severe septal deviation, bone graft with vomerine harvest allowed us to reach a good result with complete ossification of the alveolar cleft, normal height, slightly notched nasal floor, significant improvement of septal deviation viewed with orthopantomography [Figures 11 and 12]. In the same patient with a CT study [Figure 13], axial scans showed degrees of alveolar thickness in the cleft area, which was compared to the non-cleft side using the mirroring method described by Meazzini et al., 2016[17]. Ossification Type 1: bone thickness on the cleft side is 89% of the thickness on the noncleft side, classified as ideal.

Alveolar cleft reconstruction with vomerine bone: two surgical procedures in one step: a case series

Figure 11. Patient D.G. Preoperative panoramic X-Ray: a narrow alveolar cleft is evident, as well as a severe septal deviation.

Alveolar cleft reconstruction with vomerine bone: two surgical procedures in one step: a case series

Figure 12. Patient D.G. Postoperative panoramic X-Ray, with complete ossification of the alveolar cleft, normal height, slightly notched nasal floor, significant improvement of septal deviation.

Alveolar cleft reconstruction with vomerine bone: two surgical procedures in one step: a case series

Figure 13. Patient D.G. (same as Figures 11 and 12): Axial scans showing degrees of alveolar thickness in the cleft area, compared to the non-cleft side, using the mirroring method described by Meazzini et al, 2016[17]. Ossification Type 1: bone thickness on the cleft side is 89% of the thickness on the noncleft side, classified as ideal.

Some cases healed with a less optimal result, rated as good ossification of the cleft (Type 2 of Meazzini’s classification), and bone thickness on the cleft side is 52 percent of the thickness on the non-cleft side [Figure 14].

Alveolar cleft reconstruction with vomerine bone: two surgical procedures in one step: a case series

Figure 14. Patient G.A. Good ossification of the cleft (Type 2 of Meazzini’s classification), bone thickness on the cleft side is 52 percent of the thickness on the non-cleft side.

No differences were found between crest grafting and vomer grafting in Bergland’s modified classification of alveolar bone height or in Meazzini’s classification of nasal floor ossification [Table 1]. On the 3D CT evaluation, IC grafting allowed for a significantly thicker alveolar ridge at the most occlusal and middle third. There was no difference in the cranial third. The data regarding frequencies, means and standard deviations, together with the P values of the student T-test, are shown in Table 1.

Table 1

Comparison between ossification after bone grafting with VB and IC. Alveolar height and thickness and nasal ossification are compared

Bergland score panoramic X RayNasal ossificationAlveolar ossification thickness on CT
Ratio cleft/non cleft thickness
1: 100%
2: 75%
3: 50%
4: 0%
1: flat
2: asymmetric
3: severe notch
4: no continuity
Occlusal thirdMiddle thirdCranial third
Vomer BGX1.211.850.480.540.54
sd0.430.470.290.210.20
Iliac crest BGX1,671.770.750.670.34
sd0.500.80.140.110.33
Independent samples T-test0.0310.790.002**0.013*0.062

All patients experienced an improvement in respiratory function, as reported in the clinical charts. The evaluation of septal deviation showed a substantial improvement of about 16 degrees relative to the infraorbital plane. The average preoperative deviation was 62.8 ± 17.3, while the postoperative deviation was 78.6 ± 9.8. The P value of the Paired T-test was 0.008. Vomerine BG was initially performed in patients that had a previous unsuccessful SBG or an esGAP without a complete ossification, in order to allow orthodontic tooth movement or eruption in the cleft area. We extended the indication to untouched alveolar clefts with a minimal bony defect. The width of the defects was no wider than 1 cm at the nasal floor and 2-3 mm at the lower alveolar level.

DISCUSSION

The goal of alveolar cleft grafting is to fill the defect with cancellous bone, which allows a faster healing process, and to reconstruct the nasal floor with cortical bone in order to restore the nasal floor and resist the contraction of the overlying soft tissue as it heals.

The IC is worldwide considered the first choice as a donor site, because it provides a large amount of cancellous and cortical bone for reconstructing the volume. Iliac bone harvest is a very easy and safe procedure, requires special attention in preserving the growth cartilage and avoiding cutaneous nerve injury, and has two major drawbacks, the pain during postoperative mobilization with delayed ambulation and the scar, which can be very visible.

Cranial bone is an alternative that allows the surgeon to avoid visible scars. While calvaria provides a large amount of cortical dense bone and has a very easy postoperative recovery, the operative time is much longer and may have major complications (intracranial penetration with hemorrhage, infections, and dural tear)[17-19]. Tibia has also been used as a source of cortico-cancellous bone harvested with a trephine. It is a painless procedure with minimal discomfort in walking for a few days and has a smaller scar compared with IC. Care, though, has to be taken to avoid damage to the tibial articulating margin and to a correct muscular closure. If not attended, these two issues may lead to delayed wound healing, pain, hemarthrosis and secondary arthrosis of the knee joint[20].

In order to avoid visible scars, the mandible can provide cortical bone to reconstruct the alveolar defect in two different sites, chin and mandibular ramus. Harvesting bone from the chin is easy and safe, but the volume of the harvested bone is quite low, especially in the presence of an unerupted mandibular canine. The procedure is therefore recommended only for very small defects, particularly in cases where there is no need for lateral pyriform augmentation. Moreover, this procedure is associated with some postoperative complications, particularly disturbances of teeth, gingiva and soft tissue sensitivity[20,21].

The mandible allows for harvesting dense cortical bone from the ascending ramus, providing for a greater volume of bone compared to the symphysis, but the amount of cancellous bone is still very limited. Major limitations are the presence of wisdom teeth and the alveolar nerve. The reported rate of complications from the ramus is lower than the chin[22].

To our knowledge, the use of VB as a bone graft in alveolar clefts has never been described in child patients. A recent paper describes a method for the correction of nasal deformities and alveolar cleft defects in one stage using vomer and ethmoid bone and septal cartilage grafts in adult cleft patients[23]. The main purpose of the described bone grafting was to elevate the nasal ala and obtain the symmetry of the nose. Another paper describing the use of vomer as the bone source in cleft patients is about onlay grafting of anterior maxillary walls after Le Fort I advancement[24].

In unilateral complete cleft lip and palate, the nasal septum typically deviates. Even in cases with a primary cartilaginous septal repositioning, the vomer frequently grows asymmetrically. Using vomer as the bone source for alveolar graft allows solving the problem of bone defect with a simultaneous partial correction of the nasal septum deviation.

A literature review of long-term studies has shown that evidence exists that pediatric septoplasty may be performed without affecting nasal and facial growth if done after the age of 6[25,26].

With this technique, we avoid a visible scar, the bone is available in the same surgical field and postoperative discomfort is extremely low or absent. During the same procedure, we are able to improve septal deviation, reducing the nasal obstruction with improvement in breathing. All patients experienced a subjective improvement in nasal function, with a better quality of life, as stated by different authors[27,28].

The vomer is a membranous bone that is generally accepted to have less resorption compared to the endochondral bone in animal models[29]. With this technique, only cortical bone is brought into the alveolar area, without cancellous bone, even if the density of vomerine cortical bone is low. It will be important to analyze changes in the bony architecture and the ability of the teeth to migrate in the grafted area. Other important aspects that will need to be assessed in the long term are nasal growth and the improvement of nasal symmetry and respiratory function, as well as the growth of the maxilla.

One of the most debated issues is the identification of the optimal time for the long-term assessment of the graft, signifying the time when we can consider the bone volume stable.

After a short-term post-surgical follow-up of approximately one year, clinicians can presume there will be minimal change to the graft outcomes over the long term, depending on the age at which the graft was carried out and dental and soft tissue conditions[15]. Feichtinger et al., in a mid-term CT evaluation of the alveolar grafted area, found an average loss of bone volume of 49.5% in the first year after surgery, 51.3% in the second year after surgery, and 52% in the third year after surgery[30]. The results indicate that, despite various post-surgical events which may change the bony architecture, the outcomes of a center’s bone grafting protocol will change very little over time when looking at large samples of patients.

Every case of the present series has a minimal follow-up of 12 months, the time at which the panoramic X-Rays and CTs were taken. 43% of them had a 3-year follow-up, and none of these patients showed problems in the alveolar area, nor the teeth erupted in the grafted area.

Further studies are needed to investigate the overall outcome of vomer graft in cleft patients. We started using vomer as the bone source for the easiest cases in which we only needed to re-graft for implant positioning or in patients with incomplete success of the previous graft or with incomplete ossification of an esGAP. Subsequently, we performed the procedure also in cases without any previous alveolar repair, with minimal bony gaps. A major bone harvest, such as IC, was deemed disproportionate for small bony defects.

One limitation of the present study is the lack of a comprehensive evaluation of nasal function. By a simple interview, all patients experienced an improvement in respiratory function. The evaluation of septal deviation with orthopantomography showed a substantial improvement (16 degrees relative to the infraorbital plane).

In conclusion, Alveolar graft from VB seems to be a good option that allows the combination of two different procedures, reducing the morbidity of the donor site. In patients with a minimal/mild defect at the alveolar ridge, where a major harvest is not needed, with an associated septal deviation, a vomerine bone graft might be a viable alternative to IC. Proper selection of the patients is mandatory.

DECLARATIONS

Authors’ contributions

Senior surgeon, surgeries, results evaluations: Autelitano L

Senior orthodontist, results evaluations: Meazzini MC

Availability of data and materials

Not applicable.

Financial support and sponsorship

None.

Conflicts of interest

Both authors declared that there are no conflicts of interest.

Ethical approval and consent to participate

This study conducted the ethical principles outlined in the Declaration of Helsinki, ethical review was not required to undertake this research. All participants provided written consent for their information to be used in this study.

Consent for publication

Informed consent was obtained from all patients.

Copyright

© The Author(s) 2023.

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Cite This Article

Original Article
Open Access
Alveolar cleft reconstruction with vomerine bone: two surgical procedures in one step: a case series
Luca AutelitanoLuca  Autelitano, Maria Costanza Meazzini

How to Cite

Autelitano, L.; Meazzini, M. C. Alveolar cleft reconstruction with vomerine bone: two surgical procedures in one step: a case series. Plast. Aesthet. Res. 2023, 10, 16. http://dx.doi.org/10.20517/2347-9264.2022.57

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Direct Import: When the Direct Import option is selected (the default state), a dialogue box will give you the option to Save or Open the downloaded citation data. Choosing Open will either launch your citation manager or give you a choice of applications with which to use the metadata. The Save option saves the file locally for later use.

Indirect Import: When the Indirect Import option is selected, the metadata is displayed and may be copied and pasted as needed.

About This Article

Special Issue

This article belongs to the Special Issue Management of Cleft Lip and Palate
© The Author(s) 2023. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, sharing, adaptation, distribution and reproduction in any medium or format, for any purpose, even commercially, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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ISSN 2349-6150 (Online)   2347-9264 (Print)

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