固定正畸儿童的牙周状况分析

目的：探讨固定正畸对儿童牙周健康的影响。方法：随机选择20例11～15岁错合畸形儿童，分别于矫治前和矫治6个月对其进行临床牙周指标检查和龈下细菌的检测。结果：接受固定正畸治疗的儿童菌斑指数、牙龈指数、牙龈探诊出血、探诊深度显著增高，龈下菌群发生变化，G^-杆菌比例显著增加，G^ 细菌比例下降。结论：接受固定矫治的儿童牙周组织的健康受到影响，应加强口腔卫生宣教，减少牙龈炎的发生和发展。     

胫骨延长术12例报告

本文报告12例胫骨延长的结果,除1例因穿针位置不当,中途停止延长外,其余11例均达到了预计的延长长度。对胫骨延长过程中截骨断端愈合缓慢的各种病理机制以及有关延长速度与疗效的关系等问题,进行了探讨,还对司氏针穿法作了必要的改进,强凋了4枚钢针同时穿过胫腓骨的必要性。     

Periodontal status of neighboring teeth after orthodontic closure of mandibular extraction sites

abstract — The gingival health, pocket depth and loss of fiber attachment of the mandibular first molars and first premolars were studied by clinical and radiographic methods after the embedded second premolar had been surgically removed on one side and extracted after eruption on the other, and the spaces had been closed orthodontically. Twenty-nine children participated in the study. Their mean age at the time of tooth removal was 11 years 3 months. The mean duration of the treatment was 20 months, and the children were examined 1 1/2 to 2 years after removal of the bands. The gingival status was generally similar on both sides. Some constriction of the alveolar process was observed in more than half the cases, both after extraction and after surgical removal. The loss of attachment on the buccal and lingual surfaces was approximately the same in both groups, whereas the radiographic distance from the cementoenamel junction to the bone margin on the proximal surfaces adjacent to the removed tooth was somewhat greater after extraction than after surgical removal.     

Perceptions of orthodontic treatment need: Receiver Operating Characteristic analysis

Abstract This study aimed to investigate the variations in dentists' perception of need for orthodontic treatment. Sixteen dentists viewed forty clinical vignettes and recorded their decisions according to the certainty with which they would offer treatment for each case. Receiver Operating Characteristic (ROC) analysis was performed on this data, using the Index of Orthodontic Treatment Need (IOTN) as the ‘gold standard'. The data suggest that dentists treatment decisions do not concur with current guidelines in use in the UK.     

Pseudo root resorption. Case report

The importance of the correct position of the focal trough in panoramic radiography is demonstrated for the information of practitioners.     

Laser etching of teeth for orthodontic bracket placement: a preliminary clinical study.

Current interest in the use of layers in clinical dentistry has suggested that this technique may be applicable to enamel etching in orthodontics. A pulsed Nd:YAG laser was used to etch the enamel surfaces of teeth in vivo prior to the bonding of orthodontic brackets with composite resin. Overall laser bonding took considerably longer, was less reliable in terms of bond strength, and produced more discomfort than conventional acid etching. The use of the ND:YAG laser for etching teeth prior to bonding orthodontic brackets is not recommended.     

A pilot study to assess the validity of the Orthodontic Treatment Priority Index in English schoolchildren

abstract Due to the need for a reliable objective method of assessing the presence and degree of malocclusion by non-orthodontic personnel for epidemiologic purposes, a study was undertaken to investigate the Orthodontic Treatment Priority Index. A reproducibility trial was carried out, followed by discussions with an orthodontist (D.M.M.) and the use of study models to improve standardization. To test the Index, comparisons with the clinical judgments of two orthodontists were made in two separate studies of 100 children each. Each orthodontist reexamined 20 children for reproducibility. Intraexaminer reliability was good for both Index and clinical scores and a reasonable correlation was obtained between the Index and the clinical assessments in both instances. Although the results are promising and the method practical, further study is indicated, especially to determine interexaminer reliability of Index and clinical standards. It is the opinion of the authors that the Treatment Priority Index is extremely promising and a reliable objective method of assessing the presence and degree of malocclusion for epidemiologic purposes.     

Spatial and temporal repair patterns of orthodontically induced surface resorption patches

Root resorption appears to be an inevitable sequel to orthodontic tooth movement, occurring either apically or along surfaces in and around the pressure zones. However, there is uncertainty as to the location of initial cementum repair in resorbed areas as well as the time of onset of repair. The aim of the present study was to map the spatial and temporal patterns of cementum repair in orthodontically induced areas of surface resorption following maxillary expansion. Two spatial patterns of repair of orthodontic surface resorption patches were observed with cementum deposition proceeding either from the periphery or starting somewhere in the center of the resorbing areas, although the deposition starting centrally was argued to be artifactual. Furthermore, onset of reparative cementum mineralization appeared to follow within 2 wk after release of the force, involving initially only acellular cementum formation. However, the pattern of formation changed gradually, favouring a slow deposition of cellular cementum at more advanced stages of healing.     

Hypodontia of permanent teeth in Danish schoolchildren

Hypodontia, congenitally missing teeth, is one of the conditions recorded during systematic orthodontic screening of groups of children attending a community child dental health service. The present investigation reports the prevalence of hypodontia in 3325 9–10-year-old children in the 3rd schoolgrade examined with an orthopantornographic radiograph. The prevalence of children with hypodontia was found to be 7.8%. Fifty percent of these children were missing only one tooth while 85% were missing either one or two teeth. More teeth were missing in the mandible than in the maxilla. The teeth most frequently missing were the second premolars, representing 67% of the congenitally missing teeth. Symmetrical hypodontia of second premolars occurred approximately twice as often in girls as in boys. Though more teeth were congenitally missing in girls than in boys, no difference could be seen in the prevalence of hypodontia in boys (7.7%) and girls (7.8%).