Mandibular Movements in Hemimandibulectomy Patients- WITHDRAWN

Objective; The purpose of this study was to develop a better understanding of
mandibular function by delineating the effect of partial surgical resection on
mandibular movements.
Materials and Methods; Subjects consisted of an experimental group with post
lateral mandibulectomy due to oral cavity cancer and a control group of normal
subjects. The controls were matched with experimental patients by age, sex, dialect,
and general dental morphology other than surgical alteration. Mandibular border
movements and movements during speech were recorded and measured in sagittal and
frontal planes by the Gnathometer system (McCutcheon, et al ).
Border movements were recorded by instructing subjects for extreme protrusion,
retraction, lateral extrusion, opening and closing movements. Speech test material
consisted of 80 symmetric Consonant – Vowel – Consonant (CVC) syllables created
by combining four consonant sounds /p, f, s, k/ with the point vowels / I, ae , a, u / e.g.
pip, paep, pap, pup, with five repetitions. The subjects repeated the test words within
the sentence frame, “Say /haCVC/ again”.
Results & conclusions; By comparing extreme border mandibular movement with
speech movement of the experimental and control subjects the following were
resulted:
1. Hemi-mandibulectomy subjects are restricted in range and mandibular
movement (smaller border mandibular movement)
2. During speech the mandibular movements of mandibulectomy subjects
approach their potential movement capcities (larger than those with normal
mandibular structure).
3. During jaw opening lateral deviation of the mandibule decreases and
movements are toward the intact side
4. There are compensatory lip and head movements during speech production in
the experimental subjects.
KeyWords: Mandibular, Movement, Hemimandibulectomy, Patient