Influence of the Phenylephrine Test in Outcomes of External Levator Advancement for Involutional Ptosis.

PURPOSE: This study aims to evaluate the influence of preoperative phenylephrine testing on the surgical outcome of patients undergoing surgery for involutional ptosis by external levator advancement. METHODS: This was an observational, monocentric, retrospective study. Fifty-one eyelids from 32 patients, who had surgery between January 2018 and May 2023, were included for analysis. Preoperative clinical examination data were collected. Evaluation was performed at 1 month postoperatively. Surgical success was defined by a postoperative margin reflex distance between 3 and 5 mm inclusive. Symmetry success was defined by a difference in margin reflex distance between the 2 upper eyelids of no more than 1 mm. RESULTS: The surgical success rate was 86%. A positive preoperative phenylephrine test was significantly associated with a better surgical success rate (p = 0.01), including on symmetry (p = 0.01). The secondary outcomes, namely preoperative margin reflex distance, function of the upper eyelid levator muscle, and unilaterality of surgery, were not statistically associated with surgical outcome. CONCLUSIONS: The phenylephrine test is a predictive factor of surgical success in patients undergoing external levator advancement. Our study suggests that patients with a negative phenylephrine test should be overcorrected intraoperatively.

The Hypoplasic Mandible: What Makes it Different From the Healthy Child?

OBJECTIVE: This study aimed to analyze the morphology of the hypoplasic mandible and its evolution during the growth period to better understand how it differs from the pediatric healthy mandible. METHOD: Three-dimensional mandibular models of hypoplasic and healthy children aged from 39 gestational weeks to 7 years old were analyzed with a morphometric method including data clustering. Morphological distinctions between pathological and healthy mandibles were highlighted. Bilateral and unilateral mandibular hypoplasia were distinguished. RESULTS: The study sample was composed of 31 hypoplasic children and as many sex- and age-matched healthy children. Morphological distinctions between pathological and healthy mandibles were highlighted only from the first year of life. In bilateral hypoplasia, the overall mandibular dimensions were reduced while there was only a ramus asymmetry in unilateral mandibular hypoplasia (mean ± SD of the difference between the Grp03c and Grp03b subgroups: 6.80 ± 6.37 - P value = 1.64e-3 for the height of the left ramus versus 0.18 ± 4.18 - P value = .82 for the height of the right ramus). Supervised classification trees were built to identify the pathology and discriminate unilateral from bilateral mandibular hypoplasia (prediction rates = 81% and 84%, respectively). CONCLUSIONS: Based on a morphometric analysis, we demonstrated that mandibular hypoplasia significantly impacts the mandibular morphology only from the first year of life, with a distinction between bilateral and unilateral hypoplasia.

Could mastication modify the shape of the orbit? A scannographic study in humans.

PURPOSE: Since prehistory, changes of the facial skeleton have been related to the modification of diet. More recent studies have shown changes in the morphology of the mandible and maxilla due to variations of strain during mastication. The temporal muscle (TM) is a strong masticatory muscle, with its insertions extending through the temporal fossa. Our objective is to observe the relations between the TM and the lateral orbital wall (LOW) which could indicate an influence of mastication on the shape of the LOW. METHODS: We conducted a retrospective study using 100 CT scans. The length of the lateral orbital wall (LLOW), the angle between LOW and the medial orbital wall (MOW), the cross-sectional areas of LOW and of the TMs were measured on both sides of each CT scan. The correlation between TMs and other three parameters was studied by Pearson correlations. RESULTS: A correlation was found between TMs and LOWs, a lower with LLOW, and a very weak and negative correlation between LOW/MOW angle. CONCLUSIONS: Anatomical knowledge about TM and investigation of masticatory strains lead us to think that mastication have minimal effect on the morphology of the LOW, only on the frontal process of zygomatic. This may explain, in part, why the LOW is the strongest wall of the orbit.

Morphometric characterization of the very young child mandibular growth pattern: What happen before and after the deciduous dentition development?

OBJECTIVES: Numerous tools have been developed to characterize the morphometry of 3D models. The aim of this study was to apply these techniques to better understand the morphometric growth pattern of healthy children's mandibles. MATERIAL AND METHODS: The study sample was composed of 480 very young children aged from 36 gestational weeks to 7 years old. The sample was divided into three subsamples according to the development stages of their deciduous dentition. Several biometric data were collected on 3D mandibular models. RESULTS: There was homothetic growth during the first years of life. Once all deciduous teeth were fully erupted, the mandibular corpus warped more independently of the ramus, and the inter-individual variability was more pronounced. Throughout the growth period, several subgroups could be identified, highlighting the morphological growth pattern of the mandible. CONCLUSIONS: A particular morphogenesis of the mandible during the growth period was observed, which was correlated with deciduous dentition development. In younger individuals, this morphological pattern was mainly characterized by the progressive closure of the chin symphysis and ramus growth. The tongue movements in the oral space, depending on whether the child was bottle- or breast-fed, may explain this result. As the children grew older, the mandible widened to create sufficient space for the developing teeth buds. During the eruption of deciduous dentition, the mandible took on various morphologies, which was likely based on the child's sex and diet. Therefore, we assume that this mandibular morphogenesis is induced by the functional strains affecting the mandible during deciduous teeth development.

Salivary Calculi Removal by Minimally Invasive Techniques: A Decision Tree Based on the Diameter of the Calculi and Their Position in the Excretory Duct.

PURPOSE: To suggest a decision tree for the choice of the best minimally invasive technique to treat submandibular and parotid calculi, according to the diameter of the calculi and their position in the excretory duct. MATERIALS AND METHODS: Submandibular and parotid ducts can both be divided into thirds, delineated by easily recognizable landmarks. The diameter of calculi is schematically classified into 1 of these 3 categories: floating, slightly impacted, or largely impacted. RESULTS: Using 3 criteria, the type of gland involved (G), the topography (T) of the calculus and its diameter (D), a 3-stage GTD classification of calculi was established. Next, the best indication for each available minimally invasive technique (sialendoscopy, transmucosal approach, a combined approach, intra- or extracorporeal stone fragmentation) was determined for each calculus stage. CONCLUSIONS: The minimally invasive treatment options are numerous and have replaced invasive resection surgical approaches (submandibulectomy and parotidectomy) in the management of salivary calculi, significantly improving the prognosis of these diseases. We emphasize the need for flexibility in the surgical indications and challenge the dogma of "all endoscopic" management of salivary calculi.

Mandibular Titanium Miniplates Change the Biomechanical Behaviour of the Mandible in the Case of Facial Trauma: A Three-Dimensional Finite Element Analysis.

Our study aimed to compare the biomechanical behaviour of mandibles with or without titanium miniplates when subjected to an impact after bone healing using a finite element model (FEM) of the human mandible. We simulated mandibular trauma on an FEM of a human mandible carrying or not two parasymphyseal miniplates and applying a concentrated force of 2000 N to four different areas, including the insertion area, the area straddling the edge of the miniplates and the adjacent bone, at a distance from the miniplates on the symphysis, and on the basilar border of the mandible below the miniplates. Then, we compared the Von Mises stress distributions between the two models. In the case of an impact on the miniplates, the maximum Von Mises stress occurred in two specific areas, on the cortical bone at the posterior border of the two miniplates at a distance from the impact, while in the model without miniplates, the Von Mises stresses were homogenously distributed in the impact area. The presence of titanium miniplates in the case of trauma affects the biomechanical behaviour of the mandible and could cause more complex fractures. We recommend informing patients of this potential risk.

Do mandibular titanium miniplates affect the biomechanical behaviour of the mandible? A preliminary experimental study.

INTRODUCTION: Whether to conserve or remove titanium miniplates after rigid internal fixation of mandibular fractures still remains controversial. Miniplates could affect the biomechanical behaviour of the mandible in case of trauma, and therefore cause more complex fractures. MATERIALS AND METHODS: An experimental study, consisting in simulating a mandibular trauma, was designed in order to compare the fractures caused by an impact on the mandible in the presence or absence of an internal fixation. We simulated an impact on the right parasymphysis region in 10 post-mortem human subjects, according to the Charpy impact test method at an impact speed of 7.4 m/s, using a 5 kg test impactor. RESULTS: In the control group, the fracture lines were vertical and straight, without comminution. In the miniplate group, the fractures occurred close to the miniplates (4 cases) and under the miniplates (one case). The fracture lines were more complex, even comminuted in 2 cases. Thus, miniplates impacted the biomechanical behavior of the mandible, resulting in more complex fractures. CONCLUSION: Our experimental study highlighted the impact of the presence of miniplates on the mandible in case of trauma, and the risk of causing more complex fractures. We therefore recommend further investigations to determine if titanium miniplates should be systematically removed after bone healing, in patients with a higher risk of trauma in relation with previous assault injuries, alcohol or substance abuse, the practice of fighting or contact sport/activities, and soldiers.

Management of the pediatric OSAS: what about simultaneously expand the maxilla and advance the mandible? A retrospective non-randomized controlled cohort study.

OBJECTIVE/BACKGROUND: This retrospective non-randomized controlled cohort study aimed to evaluate the efficiency of simultaneous maxillary expansion and mandibular advancement for the management of pediatric OSAS. PATIENTS/METHODS: The sample was composed of 94 children treated with an innovative orthopedic device to correct a Class II malocclusion associated with an OSAS. Polysomnographic recordings were performed before and after the treatment. We also included a group of 113 age-matched control patients who had the same pathologies, but who did not receive the orthopedic treatment at the time they undergone polysomnographic exams. Statistical tests evaluated the significance of the evolution of these data, both in treated and untreated control patients. RESULTS: After nine months (±3 months) of treatment, respiratory OSAS symptoms significantly improved: the AHI significantly decreased as it became inferior to the pathological threshold (<1) for 53% of the treated patients' sample, with a greater proportion within the youngest age group (63%). Only two patients still presented a moderate OSAS after treatment, with an AHI slightly superior to 5. This positive evolution of OSAS respiratory symptoms was not observed within the control group, highlighting the real impact of the orthopedic treatment over the children's natural growth. However, sleep remained fragmented following the treatment. CONCLUSIONS: This study confirmed that simultaneous maxillary expansion and mandibular advancement induced a modification of the maxilla-mandibular anatomy, helping in the significant improvement of the respiratory OSAS symptoms. Then, considering these preliminary results, pediatric OSAS can be managed with this new orthopedic strategy, especially if it is performed early.

Do mandibular miniplates increase the risk of complex fracture in facial trauma recurrence? Case series.

Whether to conserve or remove miniplates, widely used in oral and maxillofacial surgery, has not been agreed on in the literature. Complications such as pain, infection, and screw exposure or loosening have already been largely described. We present the consequences of a trauma recurrence on a mandible with miniplates. The data of 13 patients who had a mandibular fracture previously surgically treated with miniplates (ten mandibular fractures and three mandibular osteotomies) were analysed. All the patients were male; the average age was 32 years (range, 20-64 years). The mechanism of the second trauma was assault in most of the cases. The average time between the first osteosynthesis and the new fracture was 35 months (range, 6-128 months). The fractures occurred at a distance from the miniplates in all the cases except two. No plate fracture was reported. We hypothesised that miniplates reinforced the underlying bone, protecting it from fractures, and transmitted the forces to areas anterior or posterior to the miniplates or to the condyle. Thus, the risk of mandible trauma recurrence should be taken into account in the indication of plate removal, and the biomechanical consequences of the conservation of the miniplates should be studied.

The association of Le Fort midfacial fractures with frontobasal injuries: a 17-year review of 125 cases, reflections on biomechanics, classifications and treatment.

The frequency of midface and frontobasal fractures has increased over the past 40 years despite the improvement and stringent regulation implemented on modern safety equipment (belts, helmets…). This observation might be correlated with the progress of radiodiagnosis tools. Literature was reviewed according to Prisma guidelines. We searched for reviewed articles, published between January 2000 and December 2017, through Medline (Pubmed) online databases and ScienceDirect, using the following MeSH Keywords: "Le Fort classification", "Le Fort fracture", "Frontobasal fracture", "skull base fracture", "Midface Fractures". Among 652 patients with frontobasal fractures, 125 (19.1%) were associated with a Le Fort fracture. 59 (9%) were associated with Le Fort III fracture, 51 (7.8%) with Le Fort II fracture and 15 (2.3%) with Le Fort I fracture. When frontobasal fractures were associated with midfacial fractures, we found 18 cerebrospinal fluid leaks (11.8 %) and 19 cases of meningitis (12.5 %). When only the frontobasal area was involved, there were 6 cerebrospinal fluid leaks (4.3 %) and 6 meningitis (4.3 %). Our results highlight a regular association between Le Fort fractures and frontobasal fractures for stages II and stage III of Le Fort fractures and also found a higher rate of neuro-septic complication. Further research shall investigate treatment and monitoring recommendations fitting modern epidemiology of craniofacial traumatology.

Salivary side effects after radioiodine treatment for differentiated papillary thyroid carcinoma: Long-term study.

BACKGROUND: Although many studies focus on short-term side effects of radioiodine therapy, almost none studied long-term side effects. We assessed radioiodine long-term salivary side effects after radioiodine treatment for differentiated papillary thyroid carcinoma and compared it to short-term morbidity within the same population. METHODS: A standardized self-administrated questionnaire was submitted in 2019 by patients treated with radioiodine between January 2011 and December 2012. These patients had already answered the same questionnaire 6 years before. RESULTS: Our study showed a significant reduction for salivary side effects: discomfort in submandibular or parotid area, swelling, pain, a bad or salty taste in the mouth, allowing to get back to a "normal" diet. CONCLUSIONS: Our study suggests that a significant rate of patients will recover from I131 therapy salivary side effects. As almost 30% of these remissions happened during our late stage follow-up, we highlight the necessity of a long-term follow-up in these patients.

Third molar extraction with massive hemorrhage treated by embolization.

Impaction of the third molar is relatively frequent in oral and maxillofacial surgery, and its removal is a usual operation with mostly unremarkable outcome. We report a case of bleeding that occurred after a left upper third molar extraction, which necessitated in emergency an angiography with embolization.

Chondro-keratoprosthesis: an alternative to OOKP?

PURPOSE: To evaluate the use of cartilage as a potential graft material toward osteo-odontal tissue replacement in keratoprosthesis surgery. METHODS: We describe a modification of the osteo-odonto-keratoprosthesis surgery that involves the use of autologous auricular conchal cartilage graft (ACCG). In stage 1a, a full-thickness cheek mucosa graft was performed over the ocular surface. In stage 1b, ACCG was harvested via a retroauricular approach. An optical polymethyl-methacrylate cylinder was embedded into a double-layered fragment of cartilage and secured by cyanoacrylate glue. The graft is then placed in a infraorbital pocket. Stage 2, performed after 3 months, involved retrieval of the complex and implantation after reflection of the mucosal flap, corneal trephination, iris and lens removal and anterior vitrectomy. RESULTS: We report two cases of chondro-keratoprosthesis (CKPRO) who underwent surgery with up to 15 months of follow-up. Preoperatively, vision was limited to light perception (LP) in both cases. On patient 1, CKPRO was performed in the right eye and the postoperative visual acuity stay limited to LP related to preoperative retinal lesions. On patient 2, CKPRO was performed in the left eye and the vision was improved to 20/100 J6. No postoperative complications such as extrusion, epithelial downgrowth, retrocorneal membrane or endophtalmia were observed. CONCLUSIONS: ACCG could be an interesting alternative to replace osteo-odontal graft in keratoprosthesis surgery. However, further comprehensive studies with larger sample size and longer follow-up are required. However longer follow-up and a higher number of patient are required to report postoperative complications incidence, survival and functional outcomes.

[Orthognathic surgery: surgical failures and complications]. / Chirurgie orthognathique : échecs chirurgicaux et complications∗.

Orthognathic surgery procedures mark the endpoint of lengthy orthodontic-surgical preparations and herald the completion of treatment for patients and their families. The main types of procedure are full maxillary Le Fort I osteotomies, mandibular osteotomies and chin surgery. To ensure a successful outcome, all require a favorable environment and extreme technical skill. But, like all surgical operations, they are also subject to peri- and post-operative complications resulting from treatment hazards or errors. Whatever the cause, surgical complications can entail failures in the management of the malformation. By seeking to understand and analyzing these complications, we can already help to prevent and reduce the contingent risks of failure.

Does the Eyebrow Sag with Aging? An Anthopometric Study of 95 Caucasians from 20 to 79 Years of Age.

BACKGROUND: It is commonly assumed that a progressive sagging of the eyebrow occurs with the facial aging process. Only a few studies have analyzed this modification, and the findings are disparate and inconclusive. This study, based on reproducible and validated data, aimed to quantify the modifications of eyebrow position that may occur with aging. Also analyzed were the effects of these eyebrow position changes on the upper eyelid and on frontal muscle activity. METHODS: The study included 95 Caucasian adults divided in three groups: 20 to 39, 40 to 59, and 60 to 79 years of age. Photographic portraits were made using a standardized photograph protocol. Eyebrow position was evaluated from the intercanthal line to four points along the upper margin of the eyebrow. The upper eyelid height, the lid sulcus height, and the upper iris coverage were measured. Severity of the forehead lines was analyzed using a validated scale. Reliability and validity of all measures were controlled beforehand. RESULTS: No significant differences were found when comparing eyebrow height above the medial canthus, the pupil, the lateral sclero-corneal limbus, and the lateral canthus between groups (p > 0.5). In addition, results suggested an increase of dermatochalasis when eyebrow height decreased. Also demonstrated was a significant increase of frontal muscle activity with aging. CONCLUSIONS: In contrast to conventional descriptions, this study demonstrated the stability of the eyebrow position with aging. This results from a physiological state of muscular compensation and may help explain the questionable results of eyebrow surgery.

Transoral Stensen's Duct Approach: A 22-case retrospective study.

INTRODUCTION: Parotid gland duct lithiasis is preferentially managed using minimally-invasive techniques such as sialendoscopy and lithotripsy. However, these 2 techniques cannot remedy all obstructions and other techniques such as the Transoral Stensen's Duct Approach (TSDA) may sometimes be helpful. MATERIAL AND METHODS: A retrospective study of patients treated with TSDA was conducted to evaluate this procedure between 2006 and 2013. Criteria for inclusion were: failures for lithiases (22 patients and 28 lithiases) treated with sialendoscopy and/or lithotripsy for parotid gland duct obstruction. Mean follow-up was 47.4 months. Pain intensity, swelling and occurrence of infectious episodes were evaluated immediately and after middle-term and long-term follow-up (up to 36 months). RESULTS: The best results were obtained for anterior lithiasis, with an 87.5% immediate success rate. Morbidity was low with 2 transient facial nerve upper buccal branch palsies and 2 post-operative stenoses. DISCUSSION: TSDA is an easy-to-perform and safe technique that can be recommended in cases of sialendoscopy or lithotripsy failure for anterior-third parotid duct lithiasis. Even if this technique has shown limitations for more posterior lithiases, or other causes of obstruction (stenosis, megaduct), it requires no specific material and may be useful. It may avoid an external combined approach or a parotidectomy.

Update on orbital decompression as emergency treatment of traumatic blindness.

INTRODUCTION: Blindness is a rare and severe complication of craniofacial trauma. The management of acute orbital compartment syndrome (AOCS) is not well defined and there is no standard treatment. Our objective was to find indications for orbital decompression, the best time for treatment, and the appropriate techniques. MATERIALS AND METHODS: A literature review was made from articles published between 1994 and 2014 in the PubMed database, on the emergency treatment of AOCS. RESULTS: 59 of the 89 patients treated surgically for AOCS presented with significant improvement of visual acuity (VA) after orbital decompression. The delay between trauma and surgery was short. A lateral canthotomy with inferior cantholysis (LCIC) was the most frequently used technique. DISCUSSION: AOCS with a risk of visual impairment must be decompressed in emergency, at best in the 2 hours following trauma, most often by LCIC to have the best chance of recovering VA. Adjuvant medical treatment (acetazolamide, mannitol, corticosteroids) should not delay surgery. Postoperative corticosteroid therapy is not indicated, especially in patients with severe head trauma.

Long-term radiological findings following reconstruction of the condyle with fibular free flaps.

AIM: Fibular bone grafts are considered as one of the best choices for reconstruction of the condyle. However, little data are available on bone remodelling after such reconstruction. The purpose of this study was to evaluate the long-term radiological outcome. PATIENTS AND METHODS: Eleven patients underwent condylar reconstruction with a free fibular transplant. In all cases the end of the fibular graft was placed into the glenoid fossa under the intact temporomandibular joint (TMJ) disc. Evaluation consisted of digital width and length measurement of the end of the fibula on panorex studies. RESULTS: Remodelling of the end of the neocondyle was found and consisted of rounding off and narrowing of the end of the transplant. CONCLUSION: The most likely explanation for these changes is the fact that the TMJ disc was preserved.