康复新液治疗口腔正畸慢性牙龈炎的临床疗效

目的研究康复新液在口腔正畸慢性牙龈炎中的应用价值。方法利用奇偶数字分组法对2017年9月-2019年8月本院接诊的口腔正畸后慢性牙龈炎病患76例进行分组(n=38)。对照组实行口腔洁治术治疗,实验组在对照组的基础之上加用康复新液。对比菌斑指数与牙龈疼痛程度等指标。结果实验组总有效率97.37%,比对照组81.58%高,P<0.05。实验组治疗后牙龈疼痛程度(2.86±0.82)分、龈沟出血指数(1.93±0.58)分、菌斑指数(1.09±0.31)分,比对照组(4.09±1.01)分、(2.74±0.91)分、(1.64±0.45)分低,P<0.05。实验组牙龈肿胀程度比对照组轻,P<0.05。结论于口腔正畸后慢性牙龈炎常规口腔洁治术治疗的同时,利用康复新液对患者进行佐治,可显著提升疗效,促进牙龈疼痛程度缓解,改善龈沟出血指数与菌斑指数,建议推广。     

成人正畸治疗与颞下颌关节紊乱病的MRI研究

目的 探讨成人正畸治疗与颞下颌关节紊乱病(temporomandibular disorder TMD)的关系,为预防和治疗TMD提供参考.方法 选择60例20 ～ 29岁成年正畸患者,用Helkimo指数将患者分为TMJ无症状组(44例)、TMJ有症状组(16例),分别于治疗前(t1)、治疗中(t2)、治疗后(t3),用MRI检查TMJ关节盘的位置,并用电子测量尺测量TMJ前、后间隙,观察颞下颌关节在治疗前后的变化情况与TMD间的关系.结果 治疗中TMJ无症状组、TMJ有症状组分别有8、9例患者发生TMD,两组TMD发生比例差异有统计学意义(P＜0.05);治疗前后两组均发现关节盘移位;两组治疗前后TMJ各间隙线距发生改变,但两组差异无统计学意义(P＞0.05).结论 成人正畸治疗不会导致TMD,但治疗过程中可诱发TMD症状,并有出现TMD重度症状的风险.在成人正畸治疗前对TMJ进行评估有重要意义.     

电化学酶联免疫分析法测定人牙本质涎磷蛋白的研究

目的探讨电化学酶联免疫分析法(ELISA)测定牙本质涎磷蛋白(DSPP)的可行性。方法选取牙本质涎磷蛋白标准品以辣根过氧化物酶(HRP)为标记酶、邻联茴香胺(ODA)为酶催化反应的底物,分别用电化学ELISA法及传统光学ELISA法检测酶催化产物。对比两种检测方法对DSPP检测的线性范围及检测限的差异。结果用电化学ELISA法检测酶催化产物,产物在-0.63 V(vs.Ag/AgCl)有一个灵敏的还原峰,进而可以用于游离HRP的检测,其线性范围为0.04～1.0 ng/mL,检测限为0.01 ng/mL。应用于DSPP标准品的检测,线性范围为2.5～200.0 pg/mL,检出限为2.5 pg/mL,灵敏度显著高于传统光度ELISA检测法。结论电化学ELISA法可以作为检测痕量DSPP的一个新方法。     

四种正畸粘接剂对金属托槽粘接效果的评价

目的比较4种正畸粘接剂对金属托槽的粘接效果。方法选择正畸临床44例患者,792颗牙,随机分为4组,常规牙面处理,分别按照说明书要求用京津釉质粘接剂、GC树脂改良型玻璃离子粘接剂、3M化学固化型树脂粘接剂和3M光固化树脂粘接剂粘接金属托槽,然后使用MBT矫治技术进行综合性正畸治疗,记录托槽脱落情况。12个月后,评估每组牙的牙釉质脱矿情况,并对所有数据进行统计学分析。结果 3M光固化型树脂粘接剂组托槽的脱落率低于京津釉质粘接剂组,差异有显著性(P<0.05),而其余各组间托槽脱落率的比较差异均无统计学意义(P>0.05)。京津釉质粘接剂组造成釉质脱矿程度在4组中最高,而GC树脂改良型玻璃离子粘接剂的釉质脱矿程度最低,其差异均有统计学意义(P<0.05)。结论京津釉质粘接剂相对远期粘接效果较差;GC树脂改良型玻璃离子粘接剂能够通过释放氟离子有效降低釉质脱矿的发生,是正畸治疗中较为理想的粘接材料,具有良好的临床应用前景。     

Selection of criteria for assessment of occlusal acceptability

There is no general agreement on criteria that could be applied to distinguish between orthodontically acceptable and non-acceptable occlusions after the completion of dental development. The aim of the present study was to analyse morphological and functional features that could be used as an index to define an acceptable occlusion in young adults. Three expert panels representing specialists in orthodontics and stomatognathic physiology participated in a modified Delphi method. Each panel responded to a questionnaire concerning the usefulness of various occlusal features, and a set of characteristics was selected on the basis of the responses; thereafter, applicability of the chosen characteristics and their cutoffs for an acceptable-non-acceptable dichotomy was tested clinically. To obtain a consensus level of 100%, the last panel session was completed with a group discussion. Assessments made using the morphological criteria were compared with those made with the dental health component of the Index of Orthodontic Treatment Need. The selected morphological characteristics consisted of overjet, overbite, canine relationship, crossbite, scissors bite and midline deviation. The functional evaluation comprised assessments of discrepancy between the centric relation and the intercuspal position, working- and non-working-side contacts and protrusion contacts. The dental health component and our morphological criteria showed different sensitivity to contact point displacements, interdigitation in buccal segments and increased overbite. This study provides a set of morphological and functional indicators reflecting the current consensus opinion of Finnish professionals. Further studies are needed to analyse the reproducibility of assessment of the characteristics included.     

Quality evaluation of the available Internet information regarding pain during orthodontic treatment

Objective:To investigate the quality of the data disseminated via the Internet regarding pain experienced by orthodontic patients.Materials and Methods:A systematic online search was performed for ‘orthodontic pain’ and ‘braces pain’ separately using five search engines. The first 25 results from each search term–engine combination were pooled for analysis. After excluding advertising sites, discussion groups, video feeds, and links to scientific articles, 25 Web pages were evaluated in terms of accuracy, readability, accessibility, usability, and reliability using recommended research methodology; reference textbook material, the Flesch Reading Ease Score; and the LIDA instrument. Author and information details were also recorded.Results:Overall, the results indicated a variable quality of the available informational material. Although the readability of the Web sites was generally acceptable, the individual LIDA categories were rated of medium or low quality, with average scores ranging from 16.9% to 86.2%. The orthodontic relevance of the Web sites was not accompanied by the highest assessment results, and vice versa.Conclusions:The quality of the orthodontic pain information cited by Web sources appears to be highly variable. Further structural development of health information technology along with public referral to reliable sources by specialists are recommended.     

Can the intra-examiner variability of Little's Irregularity Index be improved using 3D digital models of study casts?

Objectives

To compare contact point displacement measurements, used to determine the Little's Irregularity Index (LII) score on study casts and digital models of study casts by an independent examiner.

Methods

The contact point displacement measurements of the six maxillary anterior labial teeth were measured on ten study casts using digital callipers and their associated digital models using Creo Parametric software on five occasions following scanning using a LAVA Chairside Oral Scanner (LCOS) three-dimensional (3D) intra oral scanner. Means, standard deviations and coefficients of variation (CoV) were determined, data analyses (Pearson's correlation coefficients (PCCs) and Intraclass correlation coefficients (ICCs)) and statistical analyses (three and two-way analyses of variance (ANOVAs) and Independent Sample Student's t-tests) were carried out (p < 0.05).

Results

Significant positive correlations for the contact point displacement measurements were evident between all measurement time points for the study casts (r > 0.978; p < 0.0001 and ICC > 0.910; p < 0.0001) and the digital models (r > 0.963; p < 0.0001 and ICC > 0.986; p < 0.0001). The CoV results showed that the contact point displacement measurement data from the digital models was more reproducible than the study casts. Of the 50 Independent Sample Student's t-tests, 21 significant increases (p < 0.042) were reported in contact point displacement measurements <2.9 mm for the digital models compared with the study casts.

Conclusion

The use of 3D digital models can improve the reliability of LII measurements by reducing the subjectivity associated with choosing the anatomic tooth contact points and the awkwardness of measuring the contact point displacements on study casts using a cumbersome calliper technique.

Clinical significance

Intra-examiner variability in the measurement of LII is still evident with digital models suggesting that either improved software specifically aimed at the orthodontic community be identified or a new method for measuring anterior incisor crowding be sought.     

Effect of water contamination on the shear bond strength of self-ligating brackets

PurposeThe aim of the present study is to evaluate the effect of water contamination on the shear bond strength (SBS) and adhesive remnant index (ARI) score of self-ligating brackets.Materials and methodsOne conventional bracket and three different self-ligating brackets were bonded onto 160 bovine permanent mandibular incisors, divided randomly into 8 groups. For each type of bracket, 20 samples were bonded on dry enamel and 20 after water contamination. After 24 h, all specimens were tested for SBS using an Instron Universal Testing Machine, and ARI scores were evaluated.ResultsAll groups showed clinically adequate SBSs. Quick brackets bonded onto dry enamel showed significantly higher SBSs than all other groups tested, whereas the lowest shear strength values were recorded for Step, Quick, and Damon 3MX brackets bonded onto contaminated enamel and for Damon 3MX onto dry enamel. Frequency distribution of ARI Scores showed a prevalence of ARI “2” and “3” for all the groups tested.ConclusionsWater contamination reduces the SBS of self-ligating brackets, but significant differences have been found only for Quick brackets. All groups showed a significant higher frequency of ARI Score of “2” and “3”.