بررسي رابطه بين تماسهاي زودرس دنداني و ضايعات فاقد پوسيدگي طوق دندان

An investigation on the relationship between non-carious cervical contacts and premature contacts(Pesearch)

The aim of the present study was to investigate the relationship between non-carious cervical lesions (NCCL) and dental premature contacts. Non-carious cervical lesions are of wedge type and their first etiologic factor is tensile and compressive stresses caused by traumatic occlusion and chewing forces. Two groups, from people referring to the Faculty of Dentistry Mashad University of Medical Sciences, were chosen. In each group 167 teeth were examined for premature contacts in the seven types of teeth. The statistical analysis revealed ahighly significant and positive correlation between the incidence of NCCL and premature contacts. The NCCL group and controls differed significantly in the number of premature contacts in centric relation (CR) and working side, but not in balancing and protrusive. There was no significant difference in the incidence of lesions between upper and lower teeth. It is concluded that dental premature contacts particularly in centrie relation (CR) and working side could affect the occurence and prevalence of the cervical lesions. centric and eccentric movements. The first group had non-carious cervical lesions, and the second group as controls were without such lesions. The results indicated that within NCCL group, the frequency of non-carious cervical lesions differed significantly among seven types of teeth, the first premolar teeth showed the greatest cervical lesions, followed by the canine teeth and the second molar had the least. Similar findings were obtained in the total number of premature contacts among