Somsak Sittitavornwong1, Douglas Denson2, David Ashley2, David Cruz Walma3, Sarah Potter4, Jonathan Freind5. 1. Associate Professor, Department of Oral and Maxillofacial Surgery, University of Alabama at Birmingham, Birmingham, AL. Electronic address: jadesomsak@yahoo.com. 2. Senior Resident, Department of Oral and Maxillofacial Surgery, University of Alabama at Birmingham, Birmingham, AL. 3. Third-Year Dental Student, University of Alabama at Birmingham, Birmingham, AL. 4. Fourth-Year Dental Student, University of Alabama at Birmingham, Birmingham, AL. 5. Program Coordinator, Gross Anatomy Laboratory and Surgical Laboratory, University of Alabama at Birmingham, Birmingham, AL.
Abstract
PURPOSE: The purpose of this study was to compare the integrity of human mandibular angle fracture after fixation with a single titanium plate along the upper lateral border with that of the native human mandible. MATERIALS AND METHODS: This cross-sectional anatomic study involved the left hemimandibles of 16 human cadavers. They were selected and divided in 2 groups by remaining dental status. Additional predictor variables, such as height of the left mandibular body and gender, were noted. Left hemisected native mandibles were mounted at the condyle and loaded on an Instron 5565 mechanical unit (Instron Corp, Norwood, MA) until fracture. Fractured left hemimandibles were fixated with a titanium miniplate and screws. After plate fixation, each hemimandible was reloaded on an Instron 5565 until fracture. Data pertaining to primary outcomes of load application were recorded in newtons at displacement values of 3.0, 5.0, and 7.0 mm and at displacement at fixation failure. Primary outcomes of maximum load and displacement at maximum load were recorded in newtons and millimeters, respectively. Descriptive statistics were used to summarize sample characteristics. Statistical comparisons were performed using t test, χ2 (or Fisher exact) test, and linear regression. Pearson correlation was used to examine relations between select biomechanical measurements. RESULTS: The study sample was composed of 12 female and 4 male cadaveric hemimandibles. Donors' age at time of death ranged from 54 to 95 years (mean age, 78.94 yr). The mean maximum load in native and plated hemimandibles was 943.56 and 292.57 N, respectively (P < .0001). CONCLUSION: Key clinical findings of this study include the inability of single plate mandible fixation to restore the mandible to preinjury levels and verification that gender, dental status, and height of the mandible do not alter the stability of a single plate fixated mandible.
PURPOSE: The purpose of this study was to compare the integrity of human mandibular angle fracture after fixation with a single titanium plate along the upper lateral border with that of the native human mandible. MATERIALS AND METHODS: This cross-sectional anatomic study involved the left hemimandibles of 16 human cadavers. They were selected and divided in 2 groups by remaining dental status. Additional predictor variables, such as height of the left mandibular body and gender, were noted. Left hemisected native mandibles were mounted at the condyle and loaded on an Instron 5565 mechanical unit (Instron Corp, Norwood, MA) until fracture. Fractured left hemimandibles were fixated with a titanium miniplate and screws. After plate fixation, each hemimandible was reloaded on an Instron 5565 until fracture. Data pertaining to primary outcomes of load application were recorded in newtons at displacement values of 3.0, 5.0, and 7.0 mm and at displacement at fixation failure. Primary outcomes of maximum load and displacement at maximum load were recorded in newtons and millimeters, respectively. Descriptive statistics were used to summarize sample characteristics. Statistical comparisons were performed using t test, χ2 (or Fisher exact) test, and linear regression. Pearson correlation was used to examine relations between select biomechanical measurements. RESULTS: The study sample was composed of 12 female and 4 male cadaveric hemimandibles. Donors' age at time of death ranged from 54 to 95 years (mean age, 78.94 yr). The mean maximum load in native and plated hemimandibles was 943.56 and 292.57 N, respectively (P < .0001). CONCLUSION: Key clinical findings of this study include the inability of single plate mandible fixation to restore the mandible to preinjury levels and verification that gender, dental status, and height of the mandible do not alter the stability of a single plate fixated mandible.
Authors: Ik Jae Kwon; Byung Ho Lee; Mi Young Eo; Soung Min Kim; Jong Ho Lee; Suk Keun Lee Journal: Dent Traumatol Date: 2016-02-11 Impact factor: 3.333