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oral pathology - 3 Questions
Systemic sclerosis (scleroderma) causes contracture of facial skin giving a masklike appearance due to excessive collagen deposition and skin tightening. This leads to loss of facial expressions and a characteristic "pinched" facial appearance with microstomia and radial furrows around the mouth. Craniofacial dysostosis, achondroplasia, and solar elastosis do not cause this specific masklike facial contracture.
Lesion of the mandibular nerve leads to paralysis of tensor palatini muscle, which is innervated by the mandibular division of the trigeminal nerve (CN V3). Loss of gustatory sensation from anterior 2/3 of tongue is due to chorda tympani (CN VII) damage, and paralysis of orbicularis oculi is due to facial nerve (CN VII) damage, not mandibular nerve lesions.
Pierre Robin syndrome is classically associated with micrognathia (underdeveloped mandible), which is part of the classic triad including micrognathia, glossoptosis (posterior displacement of tongue), and cleft palate. While cleft palate is part of the syndrome, cleft lip is not typically associated. Tetralogy of Fallot and syndactyly are not characteristic features of Pierre Robin syndrome.
MCQ