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Extraoral Nasal Maxillofacial Prostheses.pptx

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Extraoral Nasal Maxillofacial Prostheses Restoration, Materials, and Fabrication for Nasal Defects
Agenda • Defining Maxillofacial Prosthetics and Extraoral Applications • Nasal Prostheses: Functions, Roles, and Components • Material Properties and Advanced Materials • Indications and Contraindications for Prostheses • Fabrication Process: From Assessment to Delivery
Maxillofacial Prosthetics Defined Maxillofacial prosthetics is a specialized field dedicated to restoring both function and esthetics for patients experiencing significant tissue loss due to trauma, surgical resection, or congenital defects. This discipline encompasses intraoral applications, such as obturators, and extraoral prostheses, like those for the nose or ear.
Extraoral Prostheses: Necessity Extraoral prostheses become essential when conventional reconstructive surgery cannot restore significant tissue loss. This often occurs due to trauma, cancer resection, or congenital defects, exceeding the limitations of autogenous tissue transfer. They offer aesthetic and functional rehabilitation. Artistic illustration of rhinoplasty procedure on a woman's nose.
Nasal Prostheses: Core Functions • Restores external nasal form and aesthetic integrity. • Protects exposed mucosa and delicate tissues. • Provides structural support for eyewear (e.g., glasses). • Normalizes facial appearance, enhancing psychosocial well-being.
The Anaplastologist's Role The anaplastologist is a highly specialized clinician focusing on custom maxillofacial prosthetics. Their expertise involves meticulous anatomical sculpting and artistic pigment matching to achieve seamless integration. They ensure the prosthesis precisely replicates the patient's unique skin tone, texture, and facial contours, critical for functional and aesthetic restoration.
Prosthesis Structure: Components • Main Body: Custom-sculpted anatomical form. • Retention Mechanisms: Adhesives, mechanical, or osseointegrated. • Internal Supports: Reinforcement for shape and durability. • Peripheral Extensions: Blend with surrounding facial tissues.
Material Properties Overview • Biocompatibility: Tissue integration, minimal irritation. • Durability & Flexibility: Withstand daily wear, conform. • Color Stability: Resist UV/environmental fading. • Ease of Fabrication: Efficient molding, customization.
Silicone: Primary Material Medical-grade silicone is the primary material for extraoral prostheses. Its superior flexibility and lifelike texture are crucial for anatomical accuracy. Excellent color matching capabilities ensure seamless integration. The soft, compliant nature significantly enhances patient comfort and acceptance. Anatomical model made of silicone, showing internal human structures.
Acrylic Resins: Structural Support Acrylic resins provide essential rigidity and strength in maxillofacial prosthetics. Unlike flexible silicones, acrylics excel in applications requiring structural integrity, such as internal frameworks. They are ideal for retention components and specific, more rigid prosthetic sections, ensuring dimensional stability and durability. Detailed cross-section of nose anatomy, highlighting structural components.
Advanced & Emerging Materials • Polyurethane: Enhanced durability, flexibility, and skin-like texture. • Vinyl Polymers: Improved aesthetics, biocompatibility, and retention. • Composites: Strength, light weight, and customizable properties. • Research Focus: Longevity, adhesion, infection resistance.
Indications: Traumatic Injury Severe facial trauma, from events like MVAs, ballistic injuries, or extensive burns, frequently necessitates nasal prostheses. This is especially true when surgical reconstruction is deemed unfeasible or would result in suboptimal aesthetic and functional outcomes. Prostheses offer a viable solution for complex anatomical deficits.
Indications: Surgical Resection Extensive surgical resection of malignant nasal tumors, such as basal cell carcinoma or squamous cell carcinoma, often creates significant tissue defects. When primary closure is not feasible, a nasal prosthesis becomes essential. This restores both aesthetics and critical nasal function.
Indications: Congenital Anomalies Congenital anomalies like arrhinia (absence of the nose) or severe craniofacial syndromes often necessitate prosthetic intervention. When reconstructive surgeries are not feasible or patient-preferred, a prosthesis offers a vital solution. It addresses both functional and aesthetic needs.
Indications: Disease-Related Loss Systemic diseases, such as Wegener's granulomatosis, leprosy, or severe fungal infections like mucormycosis, can cause extensive destruction of nasal cartilage and bone. This tissue loss significantly impacts aesthetics and function. A maxillofacial prosthesis offers a critical reconstructive solution.
Contraindications: Patient Factors • Compromised manual dexterity for prosthesis maintenance. • Significant psychological distress or maladaptive coping. • Unrealistic aesthetic or functional expectations. • Poor adherence to follow-up and care instructions.
Contraindications: Local Factors • Active infection at defect site • Compromised skin integrity (e.g., necrosis) • Severe radiation damage to tissues • Inadequate bony support for implants
Contraindicatio ns: Material Sensitivities Patient hypersensitivity to prosthetic materials, though rare, is a critical contraindication. Materials like silicones, acrylates, or adhesives can trigger allergic contact dermatitis. Meticulous material selection and pre-fabrication patch testing are crucial. This prevents adverse reactions and ensures patient safety. What strategies mitigate this risk? Patch test application on skin to check for allergic reactions.
Initial Consultation & Assessment A comprehensive clinical assessment is paramount. This involves evaluating defect morphology, surrounding tissue health, and patient medical history. Critical is understanding patient expectations and lifestyle factors to guide prosthesis design and ensure optimal functional and aesthetic integration.
Impression Taking: Creating a Mold Precise impression taking captures the facial defect and surrounding anatomy. Materials like alginate or addition silicone are commonly used. This critical step yields a negative replica, serving as the foundational mold for fabricating the custom prosthesis. Accuracy is paramount for optimal fit and aesthetics.
Master Cast Fabrication The impression is meticulously poured with dental stone or plaster, creating a precise master cast. This positive replica accurately reproduces the patient's craniofacial defect. It serves as the foundational template for subsequent sculpting, modification, and prosthesis fabrication, ensuring anatomical fidelity.
Wax Sculpting & Contouring This crucial stage involves sculpting the nasal prosthesis in wax directly onto the master cast. Precision in anatomical landmarks, symmetry, and achieving a naturalistic contour are paramount. This iterative process blends artistic vision with technical skill, mimicking soft tissue drape for optimal aesthetic integration. Sculptor's hands shape clay bust, showcasing artistry and lifelike details.
Patient Try-in & Refinement The try-in phase critically assesses the wax prototype on the patient. This iterative process involves meticulous adjustments to fit, contour, and projection. Anaplastologists integrate patient feedback with clinical expertise to achieve optimal aesthetic integration and functional comfort, ensuring personalized prosthetic outcomes.
Molding the Final Prosthesis The refined wax pattern is meticulously encased to create a definitive, often two-part mold. This mold ensures an exact replication of the approved sculpture, serving as the casting matrix for the final prosthetic material. Precision is paramount for optimal fit and aesthetics. Sculptor's hands shape clay bust, emphasizing texture and expressive features.
Material Processing & Curing Prosthetic material, typically medical-grade silicone, is meticulously mixed and then packed into the definitive mold. This critical step ensures accurate anatomical reproduction. Subsequent curing, under controlled temperature and pressure, polymerizes the material. This process optimizes mechanical properties, ensuring durability and patient comfort.
Intrinsic & Extrinsic Coloring Intrinsic coloring integrates pigments throughout the material before curing. Extrinsic coloring involves layering surface pigments to replicate detailed skin variations, freckles, and vascular patterns. This dual approach ensures both foundational color stability and lifelike aesthetic realism.
Retention Mechanisms & Delivery Prosthetic retention relies on medical- grade adhesives, mechanical clasps, or osseointegrated implants for secure attachment. Each method offers distinct advantages and considerations regarding patient comfort and long-term stability. Final delivery includes comprehensive patient education on care and maintenance protocols. Overview of bionic prosthetics and exoskeletons, their uses and designs.
Resources https://www.slideshare.net/slideshow/maxillofacial-prosthesis/40958622 http://ebooks.tau.edu.ng:8083/show/963/pdf https://www.maxillofacialprosthetics.org/ lib_Meetings_PastFutMeetings/aamp_ismr_2017-4.pdf https://pmc.ncbi.nlm.nih.gov/articles/PMC11001625/
Which of the following scenarios would most strongly contraindicate the use of an extraoral nasal prosthesis, necessitating consideration of alternative reconstructive approaches or management strategies? A A patient exhibiting mild psychological distress regarding their facial disfigurement, but expressing commitment to follow-up care. B A patient with compromised skin integrity and severe radiation damage to the perinasal tissues. C A patient requiring support for eyeglasses following a partial rhinectomy due to basal cell carcinoma. D A patient with a history of severe facial trauma resulting in extensive nasal tissue loss, but no active infection.
Conclusion • Extraoral nasal prostheses restore form, function, and aesthetics. • Material selection, especially silicone, is critical for success. • Comprehensive assessment and meticulous fabrication are essential. • Anaplastologists play a vital role in patient rehabilitation.