UNASSIGNED: This prospective study was designed to evaluate the effects of bruxism on mandibular cortical bone using radiomorphometric indices on digital panoramic radiographs.
UNASSIGNED: The mandibular cortical index (MCI), mental index (MI), and panoramic mandibular index (PMI) were measured on digital panoramic radiographs and evaluated for 128 bruxers (66 female, 60 male) and 128 control subjects. The data were analyzed statistically using intraclass correlation coefficients (ICC), Kappa statistics, Chi-square test, Kolmogorov-Smirnov test, independent t-test, and Pearson\'s correlation analysis.
UNASSIGNED: There was no difference between the groups in terms of MCI type (P > 0.05). While mean MI values were significantly higher in bruxers than the control group (P = 0.007), the difference between groups in mean PMI values was nonsignificant (P > 0.05). In both groups, the C1 type was more prevalent in females than in males (P = 0.001). Females showed significantly lower mean MI values than males in both groups (P ≤ 0.040). However, the difference between genders in mean PMI values was not significant (P > 0.05).
UNASSIGNED: MI measurements may be useful when radiomorphometric indices are to be used for the diagnosis or follow-up of bruxism in the mandible. Among radiomorphometric indices, MI and MCI values are affected by gender differences.

The present study used an aluminum phantom to calculate accurate vertical magnification values around the mental foramen on panoramic radiography (PR) and compared corrected PR (Cor-PR) thickness measurements of the aluminum phantom and mandibular cortical width (MCW) of the human head with cone-beam computed tomography (CBCT) measurements at two fields of view (FOVs). The calculated vertical magnification value for PR around the mental foramen was 1.37. Measurements of the aluminum phantom significantly differed between Cor-PR and CBCT with an FOV of 100 mm and between CBCT with FOVs of 40 and 100 mm; however, MCW measurements did not significantly differ among the three methods. There was a very strong correlation between Cor-PR and CBCT with an FOV of 40 mm and between CBCT with FOVs of 40 mm and 100 mm, and intraobserver and interobserver agreement was good-to-excellent for all methods. These results suggest that Cor-PR and CBCT with small and large FOVs are acceptable for measuring MCW.

暂无摘要。

UNASSIGNED: The number of women with osteoporosis i.e. with reduced bone mass and disruption of bone architecture, is increasing in India due to severe deficiency of Vitamin D. It has been reported throughout the country in urban and rural post-menopausal women. Vitamin D synthesis is affected by geographical location, atmospheric pollution, clothing, melanin pigmentation and sunlight exposure. Moreover, ageing is also associated with decreased vitamin D synthesis. Vitamin D deficiency is the most underdiagnosed medical condition in postmenopausal woman.
UNASSIGNED: Therefore, this study was planned to estimate and to evaluate alveolar bone mass using radio morphometric indices in postmenopausal women and its correlation with serum vitamin D3.
UNASSIGNED: We conducted a study comprising of a study group of 60 post-menopausal women, divided into 2 sub-groups, each group comprising of 30 individuals, depending on their occupation and domicile. Blood samples were taken to evaluate serum vitamin D3 level. Also, panoramic radiographs of all the study subjects were recorded for evaluation of 3 radio morphometric indices viz. mandibular cortical index (MCI), mental index (MI), and panoramic mandibular index (PMI).
UNASSIGNED: Statistical analysis revealed higher significant values in rural than in urban postmenopausal woman.
UNASSIGNED: A high overall prevalence (90%) of vitamin D deficiency was also observed in the study subjects.

OBJECTIVE: The objective of this study is to evaluate the mental index (MI) and panoramic mandibular index (PMI) of a group of adolescent patients in different body mass index (BMI) percentile.
METHODS: Subjects were divided into three different groups in accordance to their BMI percentile status: normal weight (35 subjects; mean age, 14.81 ± 2.12 years), overweight (32 subjects; mean age, 14.77 ± 2.56 years), and obese (33 subjects; mean age, 14.06 ± 2.59 years) groups. Mental index (MI) and panoramic mandibular index (PMI) were assessed on panoramic radiographs.
RESULTS: There were statistically significant differences in PMI and MI that were observed among groups (p < 0.0001 and p < 0.001, respectivel). MI and PMI are higher in overweight and obese individuals than in normal-weight.
CONCLUSIONS: Mandibular cortex was found thicker in patients who are obese and overweight compared to normal weight patients. We can suggest that young obese individuals\' bone structure can be take in consideration in orthodontic or dental surgical treatment planning.
CONCLUSIONS: Dense cortical bone may cause some difficulties in orthodontic and surgical treatment. Clinicians should understand obesity and overweight-related jaw bone changes and consider these factors to treat their patients.

OBJECTIVE: Mental index (MI) and panoramic mandibular index (PMI) are important radiomorphometric indices used for assessing the quality of the mandibular bone. The aim of this study was to investigate the possible effect of mandibular posterior tooth/teeth loss in young adults on the MI and PMI (superior panoramic mandibular index: PMI-s, and inferior panoramic mandibular index: PMI-i).
METHODS: Digital panoramic radiographs belonging to 253 patients aged between 18-35 years old were examined. According to the inclusion criteria of the study, a patient and control group was formed. The patient group (n=46) included individuals having at least one extracted tooth in the posterior region of the mandible, and the control group (n=45) included full dentate patients. The MI and PMI (PMI-i and PMI-s) were calculated bilaterally for all of the individuals.
RESULTS: No significant difference was found between the MI, PMI-i and PMI-s indices of the patient group and the control group among both genders.
CONCLUSIONS: The mandibular premolar and/or molar teeth loss in young adults did not lead to any change in the MI, PMI-i and PMI-s indices among both genders.

OBJECTIVE: To evaluate the influence of gender on the mental index (MI) and the mandibular cortical index (MCI).
METHODS: In this study, there were 120 subjects (43 male and 77 female subjects), who had undergone a dental panoramic radiograph examination for the needs of diagnosis and future treatment planning. MI and MCI were determined by orthopantomograph.
RESULTS: There was a statistically significant difference in MI dependent on gender. Male patients demonstrated significantly higher values for MI than female patients (right: t=4.127; P=0.0001, left: t=3.110; P=0.002). No statistically significant difference was observed for MCI dependent on gender (right: χ²=2.36 P=0.308, left: χ²=3.85 P=0.146).
CONCLUSIONS: MI is affected by gender, but MCI is not.

暂无摘要。

BACKGROUND: Osteoporosis is a disease characterized by low bone mass and microarchitectural deterioration of bone tissue, leading to bone fragility, and enhanced susceptibility to fractures. Dental radiographs, especially panoramic images, have been used to predict bone mineral density. A number of indices, (mandibular cortical index [MCI], mandibular cortical width [MCW], and panoramic mandibular index [PMI]) have been developed to assess and quantify the quality of mandibular bone mass and to observe the signs of resorption.
OBJECTIVE: The objectives of the study were to assess mental index (MI), MCW index, and PMI with bone density in identifying risk group for osteoporosis and also to investigate influence of age and gender on MI, MCI, and PMI.
METHODS: After obtaining consent, details regarding age, gender, systemic health status, and oral parafunctional habits were recorded in each patient. Then a digital panoramic radiograph was taken. The image thus obtained was subjected to calibrations and morphometric analysis using Digora version 2.7. The obtained values of indices were compared with the mean values of indices, to evaluate subjects whether they are prone to osteoporosis or not. The obtained information was subjected to statistical analysis for the significance of the parameters.
RESULTS: Data analysis showed that calibration indices were highly significant in the assessment of risk group for osteoporosis than noncalibration index. The subjects at a higher risk for development of osteoporosis were old-aged adults with higher prevalence being reported in women compared to male subjects.
CONCLUSIONS: In conclusion, our results suggest that higher percentage of subjects with undetected decreased bone mineral density may be identified based on trained general dental practitioners analyses of their panoramic radiographs using simple screening analytical calibration MI and MCI.

OBJECTIVE: To evaluate the relationship between panoramic radiomorphometric indexes, and the presence of osteoporotic fractures in a Spanish postmenopausal women.
METHODS: A sample of 120 women (60 with fragility spine fractures and 60 healthy), aged 55-70 years, with fragility spine fractures, were included in this cross-sectional study that was conducted from 2008 to 2011. All the women were referred to undergo a radiological spine examination, spinal densitometry and a panoramic radiograph for assessing osteoporosis using 3 radiomorphometric indexes: Panoramic Mandibular Index (PMI), Mental Index (MI) and Mandibular Cortical Index (MCI). According to mandibular cortical shape, in MCI, three groups were defined: C3 (osteoporosis), C2 (osteopenia), C1 (health).
RESULTS: Significant differences were found between all the MCI groups due to their composition between fractures and non-fractures. C1 group (healthy) has less fractures women than C2 (Bonferroni p<0.001), C1 has less fractures than C3 (Bonferroni p<0.001) and finally, C2 has less fractures than C3 (Bonferroni p<0.006). PMI and MI values were significantly lower in cases than in controls (U Mann-Whitney p<0.001).
CONCLUSIONS: Panoramic radiomorphometrics mandibular indexes such as MCI, PMI, and MI, may be useful for identifying the population at higher risk for fracture. The relationship between panoramic index and osteoporosis remains unclear and further studies using fragility fracture as a real marker of osteoporosis are warranted to clarify the exact role and effect of one condition on the other and the corresponding clinical implications.