Oronasal Fistula Closure and Defect Reconstruction: Two Case Reports Using Periodontal Plastic Surgery Principles.

OBJECTIVES: Oronasal fistulas are common sequelae following cleft lip and palate surgery and can significantly impact a patient's quality of life. They result from various factors, including surgical techniques, tissue management, and patient-specific factors. This case report explores the modern approach to oronasal fistula closure using periodontal plastic surgery principles. MATERIALS AND METHODS: The report presents two cases of patients with oronasal fistulas due to previous maxillofacial surgical intervention. These patients underwent microsurgical procedures that involved partial flap thickness preparation of the fistula areas, the use of connective tissue grafts from the palate, and meticulous suturing techniques to ensure graft integrity. The procedures were performed in stages, and postoperative care was provided. RESULTS: Both cases demonstrated successful fistula closure and graft survival. The patients reported improvements in breathing, speech, aesthetics, and quality of life. The second case also included guided bone regeneration and implant placement. CONCLUSIONS: Oronasal fistulas resulting from maxillofacial surgery can be effectively treated using periodontal plastic surgery techniques, significantly improving patients' quality of life and aesthetic outcomes. This approach represents a valuable addition to the existing repertoire of oronasal fistula closure methods.

Vertical Ridge Augmentation Using Collagen Membrane and Tenting Screws in the Esthetic Zone: A Case Series.

Successful rehabilitation of severely atrophic, short-span edentulous ridges in esthetic regions can seldom be done without some form of vertical ridge augmentation (VRA). The best available evidence shows that guided bone regeneration procedures may present a very predictable option with reduced potential for complications compared to alternative options. The present case series presents a novel technique to achieve predictable VRA with a low complication rate using tenting screws and cross-linked resorbable membranes. A total of 10 patients (5 men, 5 women) with severe vertical defects in the esthetic zone participated in this study. Following a mean healing time of 9.3 months, the mean defect resolution was 80%, with a mean vertical bone gain of 6.2 ± 1.61 mm. Only one case presented with reduced defect resolution (50%); however, the bone gain for this case was 6 mm.

Papilla reconstruction for an iatrogenic RT3 gingival defect using a tuberosity soft tissue graft: A case report.

BACKGROUND: Orthognathic surgery is a reliable and safe method to improve maxillo-mandibular malformations. However, it is a complex procedure that can affect deeper structures and the terminal blood supply of specific areas, thereby affecting the results. Occasionally, despite careful digital planning and diagnosis, esthetic complications may occur, such as scarring or mucogingival alterations, including localized aseptic necrosis with associated recessions. In more severe cases, larger fragments of necrosis may be involved. METHODS AND RESULTS: The aim of this case report was to present a case, including diagnosis, treatment plan, periodontal plastic surgical technique, and follow-up for a recession type 3 (RT3) defect. This RT3 gingival defect was associated with necrotic crestal bone exposure in the anterior esthetic area resulting from a complication after orthognathic surgery. CONCLUSIONS: Partial reconstruction of the interdental papilla can be possible through consideration of the defect characteristics, use of microsurgical principles, and utilization of a suitable connective tissue grafting technique. KEY POINTS: Why is this case new information? To the authors' knowledge, there is very limited clinical and scientific evidence regarding the management of esthetic complications associated with ischemic necrosis resulting from orthognathic surgeries. This case study identified the management of papillary reconstructions of these mucogingival defects. What are the keys to the successful management of this case? For an ideal case management, adequate plaque and infection control and timely notice of the defect appearance are critical. Additionally, proper surgical soft tissue management of the affected papillae and surrounding area is required. Finally, the type of connective tissue graft to be used, its management and fixation, and proper postoperative protocols are needed for case success. What are the primary limitations to success in this case? Despite the limitations of this study, the authors consider that the treatment of mucogingival complications related to orthognathic surgeries is possible, using microsurgical concepts and connective tissue grafts to reconstruct papillae.

Modified lip-repositioning technique for the treatment of gummy smile.

This article illustrates a new technique for repositioning the lip in the treatment of gummy smile. In particular, it introduces a formula to precisely calculate how much tissue should be eliminated to avoid the recurrence of gummy smile. The modified lip-repositioning technique (MLRT) also involves the microsurgical division of the tissue components (mucosa, periosteum, and bone) as well as the fixation of the surgically modified tissue to the periosteum component. The results of the technique are shown through case presentations of seven patients with follow-up of up to 3 years. Stable results were achieved with no recurrence of gummy smile.

Computational assessment of stomach tumor volume from multi-slice computerized tomography images in presence of type 2 cancer.

Background: The multi-slice computerized tomography (MSCT) is a medical imaging modality that has been used to determine the size and location of the stomach cancer. Additionally, MSCT is considered the best modality for the staging of gastric cancer. One way to assess the type 2 cancer of stomach is by detecting the pathological structure with an image segmentation approach. The tumor segmentation of MSCT gastric cancer images enables the diagnosis of the disease condition, for a given patient, without using an invasive method as surgical intervention. Methods: This approach consists of three stages. The initial stage, an image enhancement, consists of a method for correcting non homogeneities present in the background of MSCT images. Then, a segmentation stage using a clustering method allows to obtain the adenocarcinoma morphology. In the third stage, the pathology region is reconstructed and then visualized with a three-dimensional (3-D) computer graphics procedure based on marching cubes algorithm. In order to validate the segmentations, the Dice score is used as a metric function useful for comparing the segmentations obtained using the proposed method with respect to ground truth volumes traced by a clinician. Results: A total of 8 datasets available for patients diagnosed, from the cancer data collection of the project, Cancer Genome Atlas Stomach Adenocarcinoma (TCGASTAD) is considered in this research. The volume of the type 2 stomach tumor is estimated from the 3-D shape computationally segmented from the each dataset. These 3-D shapes are computationally reconstructed and then used to assess the morphopathology macroscopic features of this cancer. Conclusions: The segmentations obtained are useful for assessing qualitatively and quantitatively the stomach type 2 cancer. In addition, this type of segmentation allows the development of computational models that allow the planning of virtual surgical processes related to type 2 cancer.

Ulcerativas Necrotizantes / Necrotizing Ulceratives

Las lesiones ulcerativas necrotizantes han sido documentadas a través de la historia. Su denominación, diagnóstico y tratamiento ha evolucionado con el paso de los años, hasta el presente, partiendo en Gingivitis Ulcerativa Necrotizante (GUN) caracterizada como una lesión de rápida evolución, de dolor paroxístico, confinada al margen gingival y papilar. La Periodontitis Ulcerativa Necrotizante (PUN), es ampliamente considerada como una evolución de GUN, involucrando al tejido óseo y a las estructuras de inserción, la falta de medidas terapéuticas ante estas entidades, generará la evolución a Estomatitis Ulcerativa Necrotizante (EUN), la cual involucra estructuras diferentes a los tejidos dentales y de soporte, como las mucosas circundantes. Dichas entidades exhiben signos patognomónicos comunes como sangrado, ulceración, necrosis papilar, supuración, dolor y mal olor, con predominio de microflora específica: fusobacterias y espiroquetas asociadasa factores predisponentes como stress, cigarrillo, desnutrición y alcohol. En la actualidad, la más fuerte asociación epidemiológica es con el Virus de inmunodeficiencia humana (VIH), en pacientes que presentan estados de inmunosupresión menores a 200.000 linfocitos T CD4, por tal motivolos portadores de cualquiera de estos tipos de lesión deben orientar al clínico la necesidad de confirmar el diagnóstico presuntivo de seropositividad. Los parámetros de tratamiento están encausados a la erradicación del agente etiológico, empleando medios mecánicos, como detartraje y alisado radicular apoyado en empleo de antimicrobianos locales y sistémicos, y el control de los factores de riesgo.

Necrotizing ulcerative lesions have been documented throughout history. Your name, diagnosis and treatment has evolved over the years, to date, starting in Necrotizing Ulcerative Gingivitis (NUG) characterized as a rapidly developing lesion, paroxysmal pain, confined to the gingival margin and papillary. Necrotizing Ulcerative Periodontitis (NUP) is widely regarded as an evolution of NUG, involving the bone and the insertion structures, lack of therapeutic measures against these entities generate evolution, Necrotizing Ulcerative Stomatitis (EUN), which involves different structures to the dental tissues and support, as the surrounding mucosa. Such entities exhibit common pathognomonic signs such as bleeding, ulceration, papillary necrosis, suppuration, pain and bad smell, with a predominance of specific microflora: Fusobacteria and spirochetes associated with predisposing factors such as stress, smoking, malnutrition and alcohol. Currently, the strongest epidemiological association is with the human immunodeficiency virus (HIV) in patients with immunosuppressive states below 200.000 CD4 T cells, as such carriers of either type of injury should guide the clinician to confirm the presumptive diagnosis of HIV infection. The treatment parameters are prosecuted to the eradication of the causative agent using mechanical means such as scaling and root planning supported employment for local and systemic antimicrobials, and control of risk factors.

Synthesis and Structural Analysis of BaCrS(2).

A new ternary chromium sulfide, BaCrS(2), was synthesized. This solid state compound crystallizes in the orthorhombic, centrosymmetric space group Pmmn (No. 59) with a = 4.2606(6) Å, b = 4.7944(7) Å, c = 9.443(1) Å, V = 192.89(5) Å(3), and Z = 2. The solid is similar to a previously known structure BaNiS(2) in which the Ni atom is coordinated to five sulfur atoms in a square pyramidal fashion. In BaCrS(2), the square pyramid distorts such that the two S(basal)-Cr-S(basal) angles are no longer equal. Thus the BaCrS(2) solid is orthorhombic whereas BaNiS(2) is tetragonal. The distortion from the square pyramidal coordination in the title compound is traced to the broken degeneracy of the d(xy)() and d(xz)() set by a computational analysis.