摘要
Purpose@#This study is to investigate the distribution of natural tooth shades in the Korean elderly population to quantify the correlation and changes of tooth color with age and gender. In addition, the possible effects of habits on tooth color were assessed. @*Materials and Methods@#The tooth color of one of the maxillary central incisors of 200 Korean individuals aged 50 to 89 years, males and female, was measured using the portable intraoral spectrophotometer (VITA Easyshade V).CIELab and CIELCh color coordinates were recorded. We conducted the survey about the tobacco smoking, chronic disease, medication, eating habits, oral health behaviors and satisfaction with tooth color. Experimental data were statistically analyzed by using the t-test (P<0.05), two-way analysis of variance and Pearson’s correlation test.Result: The most frequent color in the Korean elderly population was 3M3 & A3.5 shade. L* and h* values decreased, whereas C*, a* and b* values increased progressively with age. There was a significant interaction between age and color coordinates for b* values (r=0.245, P<0.05). Males generally have significantly higher C*, a*, b* values and lower L*, h* value compared to females. Individuals who consumed alcohol had a higher L* value (P<0.05). @*Conclusion@#Within the limitation of this study, the central incisors were getting darker, more reddish, and yellowish with age. Information on the chromatic range of natural teeth by age and gender could help to select colors for esthetic dental restorations.
摘要
Purpose@#The aim of this study was to investigate the outcomes of endodontic treatment of mandibular second molar with C-shaped canal in elderly patients and related factors affecting the survival of the tooth. @*Materials and Methods@#From 2010 to 2015, the survival rate following endodontic treatment was evaluated in elderly patients over 60 years who visited the Veterans Health Service Medical Center for endodontic treatment. The presence of C-shaped canals was confirmed using clinical records and radiographic features. Patientʼs age, sex, systemic diseases, tooth location, vitality, signs and symptoms, fractures, caries, apical radiolucency, canal shaping methods, sealer leakage, filling voids, and restoration of prosthesis were included in the analyses as confounding variables. The survival rate of teeth was analyzed using Kaplan–Meire analysis and the relationship between the survival rate and variables was analyzed using Simple and Multiple Cox regression analysis.Result: In total, 107 teeth in elderly patients had C-shaped canal. The survival rate of teeth that received endodontic treatment was 63.70%. None of the factors investigated significantly influenced the survival rate (P>0.05). @*Conclusion@#In elderly patients with C-shaped canal, the survival rate after root canal treatment was not significantly different from that of other mandibular molars.