Objective:To investigate the clinical efficacy of orthodontic treatment for anterior tooth displacement caused by periodontitis.Methods:Seventy patients with anterior tooth displacement caused by periodontitis admitte...Objective:To investigate the clinical efficacy of orthodontic treatment for anterior tooth displacement caused by periodontitis.Methods:Seventy patients with anterior tooth displacement caused by periodontitis admitted to our hospital from October 2021 to February 2024 were randomly divided into a control group and an observation group,with 35 cases in each group.The control group received basic periodontal treatment,while the observation group received orthodontic treatment.The pain level,tooth function,periodontal condition,and inflammatory factor levels of the two groups were compared before and after treatment.Results:The pain level of the observation group after treatment was significantly lower than that of the control group(P<0.05);tooth function was significantly better than the control group(P<0.05);the height of anterior alveolar bone and the depth of periodontal pocket were both lower than the control group(P<0.05);and the level of inflammatory factors was lower than the control group(P<0.05).Conclusion:Orthodontic treatment for anterior tooth displacement caused by periodontitis is effective and can significantly improve patients’tooth function and periodontal condition,reduce pain,and lower inflammatory response,with high clinical application value.展开更多
A method of treating pulpless coloured anterior tooth is presented.Most part ofthe coloured dentin of the labial crown was removed and the dental structure was bleachedwith 30% hydrogen peroxide for 5min.The pulp cavi...A method of treating pulpless coloured anterior tooth is presented.Most part ofthe coloured dentin of the labial crown was removed and the dental structure was bleachedwith 30% hydrogen peroxide for 5min.The pulp cavity was then filled with whitephoto-curing composite.The result of the treatment is quite satisfactory.With our treatment,the intact contour of the crown and the hardness and gloss of the enamel are preserved.SEM proved that the composite was tightly bound with the enamel of the medial wall of thepulp cavity,forming an entity with the tooth,thus guaranteeing the strength of the crown.展开更多
Objectives: To study the biometric dimensions of upper front teeth in a Hong Kong SAR population including gender differences and compare this with the often recommended use of the Golden Proportion when selecting too...Objectives: To study the biometric dimensions of upper front teeth in a Hong Kong SAR population including gender differences and compare this with the often recommended use of the Golden Proportion when selecting tooth proportions. Methods: A sample of dental casts was obtained from 100 patients: 50 females and 50 males with an age range from 18 to 35 years. The sample was selected based on the criteria of intact maxillary anterior dental arches, free from imbrications and crowding, no restorations or replaced teeth in the upper front teeth. The width and length of the 600 upper anterior teeth included in the casts were measured, together with the combined upper anterior tooth width for each cast. Analysis of width/height ratio, sexual dimorphism, and golden proportions was statistically analyzed. The data was analysed by SPSS using one-sample t-test, two-sample t-test, and paired t-test. Results: Most measurements had a normal distribution. Paired sample t-test revealed that the average length of male maxillary incisors is significantly higher than female maxillary incisors, while there is no obvious difference in maxillary incisor width. The mean width/length ratio of maxillary incisors ranges from 0.78 to 0.87. The mean values of maxillary apparent tooth width prove that the golden proportion (GP) ratio 1.618 was absent in the current sample. The current study data shows that the mean values of tooth width and length differed from some other populations. Conclusions: Based on the findings of this research, there is no statistically significant difference in the maxillary anterior tooth dimensions for the right and left sides of the arch. Length and width dimensions of the central incisor (CI) were greater than those of lateral incisor (LI) and Canine (C) for both genders, suggesting CI to be the dominant anterior tooth. Some gender differences in tooth dimensions, with males tend to have longer tooth dimensions than females, the average width/length ratio of the female is higher than male, which confirms that the male tends to have longer teeth. The result shows the absence of golden proportion (GP) ratios suggesting that the Golden Proportion guideline was not applicable for the Hong Kong SAR population for either gender.展开更多
The purpose of this study was to determine the total Bolton index （TBI） and anterior Bolton index （ABI）, evaluate the clinical significance of tooth size discrepancies and the influence of gender variation of mesi...The purpose of this study was to determine the total Bolton index （TBI） and anterior Bolton index （ABI）, evaluate the clinical significance of tooth size discrepancies and the influence of gender variation of mesiodistal tooth width on Bolton Index and estimate which tooth has the greatest influence on Bolton Index. A total of 110 pairs of pretreatment dental study casts （41 male and 69 female） were selected from patients treated in Department of Orthodontics of Union Hospital in Wuhan, China. A sliding dental Vernier caliper was used for the measurement of the mesiodistal tooth width. Descriptive statistical mean values, standard deviation, standard error of the mean values, coefficient of variance and the t-test were used for the statistical analysis of the data. The study found that TBI, ABI and the total sum of teeth width had no significant difference between male and female. Male group indicated that Bolton Index （BI） was mostly influenced by the width of lower right second premolar, whereas female group showed that BI was mostly influenced by the width of both the right and left maxillary lateral incisor.展开更多
文摘Objective:To investigate the clinical efficacy of orthodontic treatment for anterior tooth displacement caused by periodontitis.Methods:Seventy patients with anterior tooth displacement caused by periodontitis admitted to our hospital from October 2021 to February 2024 were randomly divided into a control group and an observation group,with 35 cases in each group.The control group received basic periodontal treatment,while the observation group received orthodontic treatment.The pain level,tooth function,periodontal condition,and inflammatory factor levels of the two groups were compared before and after treatment.Results:The pain level of the observation group after treatment was significantly lower than that of the control group(P<0.05);tooth function was significantly better than the control group(P<0.05);the height of anterior alveolar bone and the depth of periodontal pocket were both lower than the control group(P<0.05);and the level of inflammatory factors was lower than the control group(P<0.05).Conclusion:Orthodontic treatment for anterior tooth displacement caused by periodontitis is effective and can significantly improve patients’tooth function and periodontal condition,reduce pain,and lower inflammatory response,with high clinical application value.
文摘A method of treating pulpless coloured anterior tooth is presented.Most part ofthe coloured dentin of the labial crown was removed and the dental structure was bleachedwith 30% hydrogen peroxide for 5min.The pulp cavity was then filled with whitephoto-curing composite.The result of the treatment is quite satisfactory.With our treatment,the intact contour of the crown and the hardness and gloss of the enamel are preserved.SEM proved that the composite was tightly bound with the enamel of the medial wall of thepulp cavity,forming an entity with the tooth,thus guaranteeing the strength of the crown.
文摘Objectives: To study the biometric dimensions of upper front teeth in a Hong Kong SAR population including gender differences and compare this with the often recommended use of the Golden Proportion when selecting tooth proportions. Methods: A sample of dental casts was obtained from 100 patients: 50 females and 50 males with an age range from 18 to 35 years. The sample was selected based on the criteria of intact maxillary anterior dental arches, free from imbrications and crowding, no restorations or replaced teeth in the upper front teeth. The width and length of the 600 upper anterior teeth included in the casts were measured, together with the combined upper anterior tooth width for each cast. Analysis of width/height ratio, sexual dimorphism, and golden proportions was statistically analyzed. The data was analysed by SPSS using one-sample t-test, two-sample t-test, and paired t-test. Results: Most measurements had a normal distribution. Paired sample t-test revealed that the average length of male maxillary incisors is significantly higher than female maxillary incisors, while there is no obvious difference in maxillary incisor width. The mean width/length ratio of maxillary incisors ranges from 0.78 to 0.87. The mean values of maxillary apparent tooth width prove that the golden proportion (GP) ratio 1.618 was absent in the current sample. The current study data shows that the mean values of tooth width and length differed from some other populations. Conclusions: Based on the findings of this research, there is no statistically significant difference in the maxillary anterior tooth dimensions for the right and left sides of the arch. Length and width dimensions of the central incisor (CI) were greater than those of lateral incisor (LI) and Canine (C) for both genders, suggesting CI to be the dominant anterior tooth. Some gender differences in tooth dimensions, with males tend to have longer tooth dimensions than females, the average width/length ratio of the female is higher than male, which confirms that the male tends to have longer teeth. The result shows the absence of golden proportion (GP) ratios suggesting that the Golden Proportion guideline was not applicable for the Hong Kong SAR population for either gender.
文摘The purpose of this study was to determine the total Bolton index （TBI） and anterior Bolton index （ABI）, evaluate the clinical significance of tooth size discrepancies and the influence of gender variation of mesiodistal tooth width on Bolton Index and estimate which tooth has the greatest influence on Bolton Index. A total of 110 pairs of pretreatment dental study casts （41 male and 69 female） were selected from patients treated in Department of Orthodontics of Union Hospital in Wuhan, China. A sliding dental Vernier caliper was used for the measurement of the mesiodistal tooth width. Descriptive statistical mean values, standard deviation, standard error of the mean values, coefficient of variance and the t-test were used for the statistical analysis of the data. The study found that TBI, ABI and the total sum of teeth width had no significant difference between male and female. Male group indicated that Bolton Index （BI） was mostly influenced by the width of lower right second premolar, whereas female group showed that BI was mostly influenced by the width of both the right and left maxillary lateral incisor.
