Development and evaluation of a surgical 3D simulation model on submental flap surgery training.

OBJECTIVES: The purpose of the present study was to design and assess a 3D simulation model for submental flap surgery in training oral and maxillofacial surgery (OMFS) residents. METHODS: This quasi-experimental study involved a total of 20 OMFS residents attending and was conducted from September 2023 to December 2023. A 3D submental flap surgical phantom was designed using Mimics V.21 software and printed using fused deposition modeling technology. Participants were first tested on their knowledge of submental flap surgery before being randomly assigned to experimental or control groups. The experimental group received a lecture and demonstration using the developed phantom, while the control group had traditional lecture education only. Afterward, the same test was administered to all participants post-training. Pre- and post-test scores were calculated and compared between the two groups. p-Value < 0.05 was considered statistically significant. RESULTS: The average pre-intervention test scores in the control and experimental group, were 2.5 ± 1.43 and 3 ± 0.816, respectively (p = 0.35). Post-intervention, the experimental group exhibited significantly higher exam scores compared to the group who had only received academic lecture training (6.9 ± 0.87 vs. 4.9 ± 0.99) (p < 0.001). Irrespective of the applied teaching method, both groups showed a significant increase in exam scores after receiving submental flap training (p < 0.001 for both groups, paired-sample t-test). CONCLUSION: The use of the developed submental flap phantom model significantly improved OMFS residents' test scores and knowledge of the surgical technique, suggesting its potential integration into the conventional resident training curriculum.

The impact of zygomatic buttress bone graft on nasal floor augmentation in unilateral alveolar cleft patients with late referral: A case series.

PURPOSE: This preliminary study aimed to assess the efficacy of zygomatic buttress bone grafting for nasal floor augmentation in patients with a unilateral alveolar cleft who were referred after the optimal timetable for this surgery had elapsed. CASE SERIES: Five patients, aged 12-18 years, with unilateral alveolar clefts were treated at Qaem Hospital, Mashhad, Iran. Initially, a mucous layer was established on the side of the cleft nose, followed by forming a bony bridge between the defect's sides through a bone graft derived from the zygomatic buttress and xenograft bone powder. Subsequently, the grafted region was covered with an absorbable collagen membrane, and the oral-side flap was sealed. Post-operative follow-ups occurred at 1 week, 1 month, and 3 months, and cone beam computed tomography (CBCT) was performed 6 months post-treatment. Discrepancy between the anterior edge height of the pyriform aperture on the healthy and cleft sides post-grafting was assessed. The average disparity between the height of the anterior edge of the pyriform aperture on the healthy side and the peak height achieved post-grafting on the cleft side was 1.90 ± 2.82 mm. CONCLUSION: Within the limitations of the study, it seems that zygomatic buttress is applicable for late unilateral alveolar bone grafting as an intraoral source, and is helpful in symmetric bony nasal floor reconstruction, with a good success rate.

Temporoparietal Flap for Facial Reconstruction: Donor Site Morbidity.

Background: Temporoparietal flap (TPF) is recommended when thin delicate tissue for medium sized defect is needed. The most used form of this flap is for auricle reconstruction. In this article usage of this flap for facial reconstruction other than auricle is discussed, emphasing on donor site morbidity. Method: In this retrospective study, archived files of the Department of Oral and Maxillofacial Surgery, University of Medical Sciences, Mashhad, Iran were evaluated from 2016-2020. Patients whom TPF was used for facial reconstruction were included. Flap survival was checked and donor site morbidity was evaluated in the form of skin scar and frontal nerve branch injury. Results: This flap was used in 8 patients for facial reconstruction. All the cases had experienced Alopecia and this was the greatest when the skin of scalp was also included. All of the patients could elevate the eyebrow that means intact frontal branch of facial nerve. Conclusion: TPF is a versatile flap for facial reconstruction. However, alopecia is high in composite fasciocutaneous form of this flap.

Cross Lip Vermilion Flap and Traumatic Upper Lip Avulsion: Reducing Donor Site Morbidity.

Using a cross lip vermilion flap for upper red lip reconstruction in cases other than whistle deformity in patients with cleft lip can lead to donor site morbidity. If the practitioner performs primary closure of the mucosa in lower vermilion after flap harvesting, the width and height of lower lip are reduced, which results in an increased lower incisor tooth show. Using free fat grafting is an effective method for reducing donor site morbidity in the lower lip following cross lip vermilion flap harvest.

Delayed Management of Parotid Sialocele: Role for Two-week Intraoral Drainage.

Iatrogenic injury or trauma to the salivary gland duct is one of the most common causes of parotid sialoceles, which are usually superficial, soft, and filled with saliva. The enrolled 7 patients with parotid sialocele were divided into two groups: trauma group (4 cases) and iatrogenic group (3 cases). No evidence of recurrence or cranial nerve injuries were observed. With persisted parotid sialocele, intraoral drainage for two weeks as a safe and inexpensive method is recommended.

A case series of uncommon causes of maxillary osteomyelitis: Understanding the pathology and recognizing the risks.

Maxillary osteomyelitis is a rare event. With emergence of bisphosphonates, the incidence of jaw osteomyelitis has increased. We report five uncommon cases, with a comprehensive review of etiology and pathology. The correlation between osteonecrosis and osteomyelitis is discussed.

Buccal Fat Pad Graft in Maxillofacial Surgery.

Despite the widespread use of pedicled buccal fat pad (BFP) flap in maxillofacial reconstruction, free nonvascular transfer of this fat is not widely used. Dermal fat transfer to the maxillofacial region is a known procedure with good results; however, it needs a skin incision in the donor site. Resorption of this graft is the other problem. Buccal fat with inherent resistance against resorption and ease of harvest is an interesting option. Six cases are reported in this article for the facial soft tissue augmentation in hemifacial microsomia, scar adhesion, temporal hallowing, and the release of TMJ bony ankylosis and check adhesion.

Facial Artery Musculomucosal Flap in Alveolar Cleft Surgery.

INTRODUCTION: Large anterior palatal fistula and special alveolar clefts, such as edentulous atrophic premaxilla and absent premaxilla (premaxillectomy or agenesis), as well as wide unilateral alveolar cleft, are complicated cases in alveolar cleft bone grafting surgery. A superiorly-based buccinator myomucosal flap is suitable in this regard. MATERIALS AND METHODS: The cleft patients whose large anterior palatal fistula and superiorly based buccinator myomucosal flap had been used for palatal or alveolar reconstruction were recruited in the study. The reconstruction method of the nasal floor, follow-up time, and hospital length of stay were recorded. RESULTS: A total of 10 patients had been treated by this method. The majority of them were male (6/10), the age range of the patients was 14-25 years. All flaps survived and a case of partial necrosis occurred. CONCLUSION: As evidenced by the obtained results, a superiorly-based facial artery musculomucosal flap is suitable when the palatal fistula is continuous with the alveolar cleft. Transmaxillary transfer is the other option in patients with closed maxillary arch.

Pheochromocytoma Metastasing to the Jaw: Review of the Literature and New Case.

Pleochromocytoma is a benign neuroectodermal tumor of the adrenal medulla. Ten to thirty percent of these tumors become metastatic. The bone is the most frequent site for metastasis but jaw involvement is reported rarely. A case of mandibular involvement is reported and a literature review in this topic is presented. Preoperative management of these patients undergoing general anesthesia is not a routine practice in maxillofacial surgery, so this topic is also is explained.

Donor Site Morbidity in Submental Flap: Emphasizing on Facial Hairs Direction.

INTRODUCTION: Donor site morbidity is an important factor for selecting a flap for reconstruction. Submental flap using submentum skin for reconstruction has low donor site morbidity. Up to now, donor site morbidity of submental flap in Caucasians has not been evaluated. MATERIALS AND METHODS: In a retrospective study, donor site morbidity of the submental flap including changes in hair direction, hypertrophic scars, and suture marks was evaluated. RESULTS: Forty patients with at least 2 years of follow-up were evaluated. Female patients indicated better esthetic results. Abrupt beard hair direction change occurred in five male patients. Two hypertrophic scars and one suture mark were recorded. CONCLUSION: The direction of beard hairs in submentum may be changed after submental flap harvest. Accordingly, this is important in some ethnic and religious groups.

Facial Blanching after Local Anesthesia Injection: Clinico-anatomical Correlation-Review of Literature.

Facial blanching as a complication of local anesthesia is reported in dentistry. Inadvertent arterial penetration and subsequent vasospasm has been accepted as the mechanism of this phenomenon. Most cases occur after inferior alveolar nerve block injection. In this article, five cases are reported after Gow-Gates injection, maxillary nerve block via greater palatine foramen, inferior alveolar nerve block, and maxillary buccal infiltration. It is the largest case series in this topic. Also, clinico-anatomical correlation between facial-mucosal blanching and the site of intra-arterial injection is explained. To the best of our knowledge, partial blanching of the face subsequent to buccal infiltration is reported for the first time in this article. Cutaneous surgeon should be aware of this complication and should not carry out unnecessary treatment.

A study on PEI among private dentists in Mashhad, Iran.

AIM: We aimed to identify the percutaneous exposure incident (PEI) by private dentists in Mashhad, Iran. METHODS: Subjects included 199 dentists enrolled in this study. A questionnaire consisting of 11 questions was sent to the dentists for data collection. Information was collected on knowledge about dangers of PEI, a history of needlestick or sharps injuries over the past 12 months, types of devices causing the needlestick or sharps injuries, HBV vaccination, knowledge about PEI protective and therapeutic protocol, and reporting PEI to the specialist. The first ten questions were corrected and each sheet received a score ranging from 0 to 10. RESULT: 95 women (47.7%) and 104 men (52.3%) participated in this study aged between 27-72 years old. The findings showed that a total of 132 dentists (66.3%) had experiences with PEI. 45 (22.6%) of them had experiences with PEI in the past year. Files and needles were found to be the most frequent tools causing PEI, each with 29.7% of frequency. 16.6%, 8.6, 5.7, and 9.7% were obtained for dental burs, band, and surgical baled, respectively as other tools responsible for injuries. Results of the question about causes of needlestick injuries showed that personal carelessness is the most frequent reason (53.8%) followed by inappropriate disposal of the needles (7.6%). CONCLUSION: The personal carelessness and inappropriate disposal of needles were reported as the most common reasons for PEI injuries. It is suggested to educational programs for dentists should focus on preventing the PEI.

The Importance of Dental Appliances for Oral Commissure Reconstruction in Trauma-Induced Microstomia: A Clinical Report.

Reconstruction of the oral commissure is necessary after trauma, pathological resection, or electrical, chemical, or thermal burns. Using dental appliances is strongly recommended to prevent microstomia in victims with oral commissure injury caused by burns. These appliances can be modified from dynamic to static for more patient comfort during the healing period and used in trauma patients to prevent rounding of the labial commissure. Preventing relapse of microstomia and forming acute angles at the corner of the mouth are 2 optimal goals when performing this surgery.

Parapharyngeal Hemangiopericytoma: the Role for Mandibular Proximal Segment Replantation-Review of Literature.

Pharyngeal hemangiopericytoma is a rare tumor .Surgical access to space has been selected based on the location of the tumor in this space, size, and type of pathology. Hemangiopericytoma requires extracapsular dissection. Hemorrhagic nature and tight attachment to adjacent tissues are the other reasons for choosing the surgical approach with the best access. The patient was a 55-year-old female with left-sided facial swelling and dumbbell-shaped lesion involving buccal and lateral pharyngeal space. Brisk hemorrhage happened during biopsy. Submandibular incision, osteotomy of mandibular angle, and temporary proximal segment removal were done. Extracapsular dissection of the lesion performed under direct vision. Proximal segment was returned to the original location and internally fixed with miniplate. Postoperative course was without complication. Mandibular proximal segment replantation technique should be used to treat parapharyngeal tumors with a hemorrhagic tendency.

Biologic Basis of De-Epithelialized Transverse Platysma Flap for Oral Cavity Reconstruction.

INTRODUCTION: The inferiorly and laterally based platysma myocutaneous flap contains hair in some ethnics; therefore, it is required to change the myocutaneous flap to myofascial flap to prevent the hair growth after its transfer to the oral cavity. MATERIALS AND METHODS: Five male mongrel dogs were selected for this study. De-epithelialized laterally based platysma flap, muscle part facing the oral cavity, was used for buccal reconstruction. The clinical healing process was photographed every week. After 40 days, biopsy specimens were obtained from the transferred flap. RESULTS: According to the results, all flaps survived. At the end of the first week, the flap was covered with fibrinous exudate. On the third week, only the center of the transferred flap was not covered with mucosa. Within 40 days, the flap was distinguishable clinically from the adjacent buccal mucosa just by hypopigmentation. Hematoxylin and eosin staining of the biopsy specimens taken on day 40 showed thin stratified squamous epithelium covered with a tiny parakeratin layer. CONCLUSION: Myofascial platysma flap, muscle part faced oral cavity, survives and undergoes mucosalization after adaptation to the recipient oral tissue.

Trauma-Induced Unilateral Buccal Nonocclusion.

Buccal nonocclusion is a difficult situation for orthognathic surgeons. This is the severest form of crossbite with congenital or traumatic origin. Unilateral cases are more difficult and need more attention. Posttrauma-acquired buccal nonocclusion is easier for management than congenital cases that need orthodontic preparation and more complicated orthognathic surgeries. Two cases of trauma-induced unilateral buccal nonocclusion are presented with different etiologies. Preoperative model surgery and posterior segmental surgery are keys to correct trauma-induced buccal nonocclusion.

Mandibular Body Fracture during Inferior Alveolar Nerve Transposition: Review of Literature.

Inferior alveolar nerve transposition is a useful adjunctive surgery in implant dentistry when there is insufficient bone between the ridge crest and the inferior dental canal. However, if this surgery is done carelessly, complications such as mandibular fracture and permanent lower lip numbness can occur. This article reports the first case of bilateral mandibular body fracture occurring during inferior alveolar nerve transposition. The surgical management of a complicated bilateral displaced mandibular body fracture is explained herein. A literature review of mandibular fracture after inferior alveolar nerve transposition is also presented. Adhering to the principles of fracture, treatment is mandatory for the successful management of mandibular fracture after inferior alveolar nerve transposition.

Nasoplatine Island Advancement Flap for Closure of Anterior Palatal Fistula in Patient With Isolated Cleft Palate.

Palatal fistula is common in cleft patients. Palatal fistula repair is difficult, and there is 10% to 30% recurrence rate. Application of nasopalatine Island advancement flap for easy closure of medium size anterior palatal fistula in isolated cleft patient is demonstrated. Anatomic basis, advantages, and limitations of this new flap are explained. Nasopalatine Island advancement flap is a useful aid for easy closure of medium size anterior palatal fistula in isolated cleft patient.