Maxillofacial Defects and Prosthetic Rehabilitation

Maxillofacial Defects: Classification

Congenital Defects

• Cleft lip and palate
• Microtia and Anotia
• Congenital anophthalmia

Acquired Defects

• Surgical resection
• Trauma
• Pathological: Osteomyelitis, post-radiation necrosis

Developmental Defects

• Micrognathia
• Maxillary hypoplasia
• Hemifacial microsomia

Objectives of Maxillofacial Restoration

• Restoration of function
• Restoration of esthetics
• Psychological rehabilitation
• Surgical reconstruction

Rehabilitation of Maxillofacial Defects

• Surgical reconstruction
• Prosthetic rehabilitation
• Combined surgical and prosthetic approach

Palatal Development

• Primary Palate: 5th week, median nasal process rises to form the premaxilla.
• Secondary Palate: 7th week, fusion begins at the nasal septum, giving rise to the hard and soft palate.

Etiology of Clefts

• Embryonic abnormal positioning
• Failure of tongue drop
• Persistence of epithelium at the line of fusion
• Genetic factors, chemical irritation, or radiation
• Vitamin A deficiency, German measles, anxiety, and hypoxia

Disabilities Associated with Clefts

• Feeding and nutrition
• Speech and communication
• Hearing
• Dental and occlusal issues
• Esthetic and psychological concerns

Prosthetic Rehabilitation

Indications for Congenital Palatal Prostheses

• Residual defects after primary repair affecting speech or feeding
• Cases unsuitable for surgery or requiring adjunct secondary surgery
• Velopharyngeal insufficiency (VPI) unresponsive to speech therapy

Types of Definitive Prostheses

• Fixed partial dentures
• Definitive palatal obturators
• Speech aid prostheses (speech bulb)
• Palatal lift prostheses

Speech and Velopharyngeal Disorders

Speech Components

1. Respiration
2. Phonation
3. Resonation
4. Articulation
5. Neurologic integration
6. Audition

Velopharyngeal Insufficiency (VPI)

Causes: Congenital cleft palate, developmental shortness of the soft/hard palate, deep nasopharynx, or acquired tumor resection.

Velopharyngeal Incompetence

Causes: Neurological disorders (bulbar palsy, myasthenia gravis, stroke).

Prosthetic Appliances

Palatal Lift Prosthesis

• Advantages: Minimized gag response, tongue physiology preserved, access to nasopharynx.
• Contraindications: Inadequate retention, non-displaceable palate, uncooperative patient.

Meatal Obturator

:pts defects soft palate active gag reflex-Edentulous patients retention problem/Acquired Maxillary Defec:Etiology:Traumatic-Pathological-Surgical/Disability acq max:1)Speech-2)Swallowing-3)Appearance-4)Psychological/Surgical Modific Enhanc Prosth Prog:Resection outline-transalveolar section-premax segment-retention key teeth-Lat margin-Hard palate-soft palate func concept-Access defect-Osseointegrated-pt specific implants-Lining flap skin graft/Indic Obturator:Large defect-Large soft palate-High malignancy recurrence-infection-Medically compromised pts