Dental age estimation in Malaysian adults based on volumetric analysis of pulp/tooth ratio using CBCT data / Muhammad Khan Asif
Secondary dentine formation is one of the vital physiological age-related change that occurs in the permanent dentition throughout life. This physiological agerelated factor can be used for dental age estimation and identification of unknown deceased persons. Aims To investigate the strength of...
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| Format: | Thesis |
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2017
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| Online Access: | http://studentsrepo.um.edu.my/10416/ http://studentsrepo.um.edu.my/10416/4/khan.pdf |
| Summary: | Secondary dentine formation is one of the vital physiological age-related change
that occurs in the permanent dentition throughout life. This physiological agerelated factor can be used for dental age estimation and identification of unknown
deceased persons.
Aims
To investigate the strength of association between chronological age and pulp/tooth
volume ratio among the Malaysian population and to find which amongst these 3
types (Maxillary right canines, maxillary left canines, maxillary right central
incisors) of investigated monoradicular teeth had the highest strength of correlation.
Materials and Methods
Three hundred CBCT scanned data of 153 males and 147 females’ belonging to
either Chinese or Malay ethnicity, stored in the Oral and Maxillofacial Imaging
Division, Faculty of Dentistry University of Malaya were selected according to the
quality, image acquiring parameters and age of the patients at the time of
registration. The subjects were divided into 5 age groups (10 years interval each
group), ranging from 16 to 65 years to ensure balanced sample distribution across
the 5 groups. Subsequently 100 maxillary left canines, 100 maxillary right canines
and 100 maxillary right central incisors having no pathology and fully developed
roots were selected from the database of 300 CBCT scans. Hence, one tooth per
CBCT scan was selected. Maxillary right and maxillary left canines were selected
for the study in order to investigate if any significant difference in the strength of
correlation occurred between two similar types of teeth belonging to different
iv
subjects. CBCT data was acquired using the i-CAT Cone Beam 3D Dental Imaging
System (Imaging Sciences International, Hatfield, USA). The scans selected had
exposure parameters of 120 KV, 18 mA and the scans were acquired using voxel
size of 0.30 mm and scanning time of 20 sec. Volumetric analysis was performed
with MIMICS software (Materialise NV, Belgium, version 16.0). Data was analysed
using SPSS version 20.
Results
The Pearson correlation and regression analysis showed a significant inverse
association between pulp/tooth volume ratio and chronological age for all the 3 types
of investigated teeth (p<0.01). Results showed the highest coefficient of
determination (R2) values for maxillary central incisor (R2=0.696) followed by
maxillary right canine (R2=0.545) and maxillary left canine (R2=0.527). The
strength of correlation for both male and female was found to be very good. Fisher
Z test results showed no significant difference in the correlation coefficient values
between genders for all the 3 types of investigated teeth and for the whole sample
(Z critical 1.96 for p < .05). Fisher Z test indicated no significant difference in the
correlation coefficient values between maxillary right and maxillary left canines
(P=0.88), despite these teeth being selected from different individuals.
Conclusion
The present study reinforced that pulp/tooth volume ratio with age is a valuable
indicator for dental age estimation for Malaysian population. Maxillary right central
incisor has shown the highest coefficient of determination value among all 3 types
of investigated teeth. Furthermore, the results have showed that this method of
dental age estimation is indeed gender independent. |
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