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A longitudinal cephalometric study of mandibular asymmetry and condylar hyperplasia and hypoplasia
Reviews and ab~~~ac~~!fi
Volume 91 Number 6
a larger dentoalveolar effect than midsagittal basal bone, When treatment was extended to 1.57 years over a mean total age period of 2.5 years, similar changes were found but at a reduced rate. Overall mean incisor tooth length loss was 0.9 mm/year and apical root resorption at about 1.4 mm/yr or 15.62%/year. The major portion of this resorption occurred during the initial phase of treatment. The effects of sex and age were not found to have any correlation to the amount of apical root loss.
Longitudinal Cephalometric Study of bular Asymmetry and Condylar plasia and Hypoplasia Rochester,
New York:
Eastman
Dental
Center,
1986
The purpose of this study was to investigate the relationship between mandibular asymmetries and the morphology and growth of the mandible using serial cephalometric records. The subjects consisted of four persons whose initial ages were from 9 to 10 years. Three of these subjects demonstrated obvious clinical mandibular asymmetries; the fourth subject appeared to be symmetric. Forty-five degree oblique radiographs were used, and the entire mandible was traced on these views. Records available for the subjects covered time spans of 9, 10, 11, and 22 years. Linear measurements of the mandibular body, ramus, and condyle were evaluated. Examination of ramal heights indicated differing patterns of growth in the asymmetric persons. Differences between right and left sides may exist at an early age, yet remain fairly constant with growth; in other instances a progressive increase in the disparity between right and left may occur. In a clinically normal person, differences between right and left do occur yet remain consistently small throughout adolescent growth. However, in one subject discrepancies did not become evident until approximately 25 years of age and became progressively more severe, although prior to this occurrence the magnitude of left-right differences was very small. Area measurements, although somewhat
variable, demonstrated progressive increases in condylar area in some asymmetric persons as well as a slowly progressive decrease in condylar area in one instance.
A Comparison of Arthrog Joint Sound Analysis in T Internal Derangements J. Lawrence Hutta, Thomas W. Richard W. Katzberg, Ross Tall Mark A. Espeland Rochester,
New
York: Eastman
Dental
Center,
1986
Internal derangements of the temporoma~dibul~ joint (TMJ) are common and can be detected by arthrography, CT, or magnetic resonance imaging. Recently, it has been suggested that clicking sounds produced during reducing displacements of the disc can be assessed for indices that may inexpensively and noninvasively establish a specific diagnosis. The purpose of this clinical investigation was to examine the possibility that an analysis of TMJ sound power spectra can effectively separate abnormalities of the TMJ related to variable degrees of disc displacement. Categories of patients studied were as follows: symptomatic but arthrographically normal (SN), meniscal displacement with reduction (painful clicking of the TMJ [MDR]), and meniscal displacement without reduction (MD). Sounds were obtained prospectively on 47 joints before arthrographic examination using a digital stethoscope that allows a computer-generated power spectrum analysis. Our results indicate that the M had 4 times more energy above a frequ than either SN or MDR joints (P 0.001); test). A rating scale of the power spectrum waveforms was also used to examine differences between groups. The power spectra for 71% of the MDR joints were classified as “smooth” as compared with only 10% of the SN and 5% of the MD TMJs (P 0.0005; chi-square test). This study strongly supports the sugestion that an analysis of TMJ sounds can provide an effective screening examination.
Volume 91 Number 6
a larger dentoalveolar effect than midsagittal basal bone, When treatment was extended to 1.57 years over a mean total age period of 2.5 years, similar changes were found but at a reduced rate. Overall mean incisor tooth length loss was 0.9 mm/year and apical root resorption at about 1.4 mm/yr or 15.62%/year. The major portion of this resorption occurred during the initial phase of treatment. The effects of sex and age were not found to have any correlation to the amount of apical root loss.
Longitudinal Cephalometric Study of bular Asymmetry and Condylar plasia and Hypoplasia Rochester,
New York:
Eastman
Dental
Center,
1986
The purpose of this study was to investigate the relationship between mandibular asymmetries and the morphology and growth of the mandible using serial cephalometric records. The subjects consisted of four persons whose initial ages were from 9 to 10 years. Three of these subjects demonstrated obvious clinical mandibular asymmetries; the fourth subject appeared to be symmetric. Forty-five degree oblique radiographs were used, and the entire mandible was traced on these views. Records available for the subjects covered time spans of 9, 10, 11, and 22 years. Linear measurements of the mandibular body, ramus, and condyle were evaluated. Examination of ramal heights indicated differing patterns of growth in the asymmetric persons. Differences between right and left sides may exist at an early age, yet remain fairly constant with growth; in other instances a progressive increase in the disparity between right and left may occur. In a clinically normal person, differences between right and left do occur yet remain consistently small throughout adolescent growth. However, in one subject discrepancies did not become evident until approximately 25 years of age and became progressively more severe, although prior to this occurrence the magnitude of left-right differences was very small. Area measurements, although somewhat
variable, demonstrated progressive increases in condylar area in some asymmetric persons as well as a slowly progressive decrease in condylar area in one instance.
A Comparison of Arthrog Joint Sound Analysis in T Internal Derangements J. Lawrence Hutta, Thomas W. Richard W. Katzberg, Ross Tall Mark A. Espeland Rochester,
New
York: Eastman
Dental
Center,
1986
Internal derangements of the temporoma~dibul~ joint (TMJ) are common and can be detected by arthrography, CT, or magnetic resonance imaging. Recently, it has been suggested that clicking sounds produced during reducing displacements of the disc can be assessed for indices that may inexpensively and noninvasively establish a specific diagnosis. The purpose of this clinical investigation was to examine the possibility that an analysis of TMJ sound power spectra can effectively separate abnormalities of the TMJ related to variable degrees of disc displacement. Categories of patients studied were as follows: symptomatic but arthrographically normal (SN), meniscal displacement with reduction (painful clicking of the TMJ [MDR]), and meniscal displacement without reduction (MD). Sounds were obtained prospectively on 47 joints before arthrographic examination using a digital stethoscope that allows a computer-generated power spectrum analysis. Our results indicate that the M had 4 times more energy above a frequ than either SN or MDR joints (P 0.001); test). A rating scale of the power spectrum waveforms was also used to examine differences between groups. The power spectra for 71% of the MDR joints were classified as “smooth” as compared with only 10% of the SN and 5% of the MD TMJs (P 0.0005; chi-square test). This study strongly supports the sugestion that an analysis of TMJ sounds can provide an effective screening examination.