Yunmeng Da1, Chao Wang2, Le Zhang3, Fuyin Wang4, Haoxuan Sun3, Xiaolan Ma5, Xuliang Ma3, Rui Li6, Zhiyin Zhang7, Dongzhen Li3, Jing Jia8. 1. Hebei Provincial Key Laboratory of Ophthalmology, Hebei Clinical Medical Research Center of Eye Diseases, Department of Prosthodontics, Hebei Eye Hosipital, Quanbei East Street, No.:399, Xiangdu, Xingtai, China. dayunmeng@126.com. 2. Hebei Provincial Key Laboratory of Ophthalmology, Hebei Clinical Medical Research Center of Eye Diseases, Department of Implantation, Hebei Eye Hosipital, Quanbei East Street, No.:399, Xiangdu, Xingtai, China. 3. Hebei Provincial Key Laboratory of Ophthalmology, Hebei Clinical Medical Research Center of Eye Diseases, Department of Oral and Maxillofacial Surgery, Hebei Eye Hosipital, Quanbei East Street,No.:399, Xiangdu, Xingtai, China. 4. Hebei Clinical Medical Research Center of Eye Diseases, Hebei Provincial Key Laboratory of Ophthalmology, Department of Medical Imaging, Hebei Eye Hosipital, Quanbei East Street, No.:399, Xiangdu, Xingtai, China. 5. Hebei Provincial Key Laboratory of Ophthalmology, Hebei Clinical Medical Research Center of Eye Diseases, Department of Dental Internal Medicine, Hebei Eye Hosipital, Quanbei East Street, No.:399, Xiangdu, Xingtai, China. 6. Hebei Provincial Key Laboratory of Ophthalmology, Hebei Clinical Medical Research Center of Eye Diseases, Department of Imformation, Hebei Eye Hosipital, Quanbei East Street, No.:399, Xiangdu, Xingtai, China. 7. Hebei Provincial Key Laboratory of Ophthalmology, Hebei Clinical Medical Research Center of Eye Diseases, Department of Prosthodontics, Hebei Eye Hosipital, Quanbei East Street, No.:399, Xiangdu, Xingtai, China. 8. Department of Stomatology, Third Medical Center of Chinese PLA General Hospital, Yongding road No:69, Haidian, Beijing, China.
Abstract
OBJECTIVE: The purpose of this study was to investigate the prevalence and relevant factors of taurodontism in North China. METHODS: We retrospectively analysed the cone beam computed tomography (CBCT) of 1025 patients (496 male and 529 female) aged between 10 and 59 years. The crown-body/root (CB/R) ratios of the maxillary and mandibular molars were measured. The prevalence of hypotaurodontism, mesotaurodontism, and hypertaurodontism was then calculated and the incidence of taurodontism along with its relevant factors, was evaluated. RESULTS: The overall rate of taurodontism in North China was as high as 78.9%. If the third molars (opsigenes) were excluded, which have a big morphological variation from each other, the rate was 52.4%. The mean CB/R ratio of taurodontism differs from tooth position: maxillary mandibular third molars > maxillary third molars > maxillary second molars > maxillary first molars > mandibular second molars > mandibular first molars (P < 0.05). In addition, the 1025 patients were divided into different age groups, and it was found that the mean CB/R ratio decreased with age (P < 0.05). Moreover, the CB/R ratio of the mandibular first and second molars in female patients was higher than males (P < 0.05). CONCLUSION: This study revealed that taurodontism is widely prevalent in North China. The incidence of taurodontism increases the closer the tooth is to the back end of the dental arch, and quite a few of the maxillary and mandibular third molars teeth have tapered roots. And the taurodontism is decreased by age, as there were more affected female than male patients.
OBJECTIVE: The purpose of this study was to investigate the prevalence and relevant factors of taurodontism in North China. METHODS: We retrospectively analysed the cone beam computed tomography (CBCT) of 1025 patients (496 male and 529 female) aged between 10 and 59 years. The crown-body/root (CB/R) ratios of the maxillary and mandibular molars were measured. The prevalence of hypotaurodontism, mesotaurodontism, and hypertaurodontism was then calculated and the incidence of taurodontism along with its relevant factors, was evaluated. RESULTS: The overall rate of taurodontism in North China was as high as 78.9%. If the third molars (opsigenes) were excluded, which have a big morphological variation from each other, the rate was 52.4%. The mean CB/R ratio of taurodontism differs from tooth position: maxillary mandibular third molars > maxillary third molars > maxillary second molars > maxillary first molars > mandibular second molars > mandibular first molars (P < 0.05). In addition, the 1025 patients were divided into different age groups, and it was found that the mean CB/R ratio decreased with age (P < 0.05). Moreover, the CB/R ratio of the mandibular first and second molars in female patients was higher than males (P < 0.05). CONCLUSION: This study revealed that taurodontism is widely prevalent in North China. The incidence of taurodontism increases the closer the tooth is to the back end of the dental arch, and quite a few of the maxillary and mandibular third molars teeth have tapered roots. And the taurodontism is decreased by age, as there were more affected female than male patients.
Authors: Raquel R Gomes; Clarissa D Habckost; Larissa G Junqueira; André F Leite; Paulo T Figueiredo; Lílian M Paula; Ana C Acevedo Journal: Arch Oral Biol Date: 2012-05-28 Impact factor: 2.633
Authors: Laura L E Whitehouse; Claire E L Smith; James A Poulter; Catriona J Brown; Anesha Patel; Teresa Lamb; Lucy R Brown; Elizabeth A O'Sullivan; Rowena E Mitchell; Ian R Berry; Ruth Charlton; Chris F Inglehearn; Alan J Mighell Journal: Oral Dis Date: 2018-09-09 Impact factor: 3.511