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At least 613 records · Page 34Linked to original sources
PubMed2003

[Stability of teeth alignment after orthodontic treatment].

OBJECTIVE: To investigate the relapse of incisor alignment after orthodontic treatment and possible factors which may related to its stability. METHODS: 72 finished cases with full records selected from orthodontic clinic of Peking University School of Stomatology composed the sample. The follow-up lateral head films and study casts were taken at least 2 years after orthodontic treatment. The cephalograms were measured by computerized program and the study casts measured by caliper. RESULTS: The upper Irregularity Index decreased from (11.5 +/- 5.02) mm before treatment to (2.01 +/- 1.39) mm after treatment and then increased to (3.46 +/- 1.69) mm in the follow-up stage. The lower Irregularity Index decreased from (7.24 +/- 44.35) mm before treatment to (1.75 +/- 1.04) mm after treatment and then increased to (3.39 +/- 1.78) mm in the follow-up stage. The changes are significant statistically. The changes of jaw in the sagittal and vertical directions as well as the related changes of the position of lower incisors, the decrease of the lower canine arch width, Bolton Index and sex all have statistically significant relation with the changes of the lower Irregularity Index after retention. CONCLUSIONS: Compared with lower arch, the alignment in upper arch is more stable in the follow-up stage. The results suggest that some possible factors may have correlations with the change of lower arch crowding during the follow-up stage.

Adolescent↗
PubMed2003

[Computer tomograghy study on periodontal patients with anterior displaced teeth before and after combined orthodontic-periodontal treatment].

OBJECTIVE: To evaluate evaluation of the changes of alveolar bone height in the periodontal patients with anterior teeth displacement before and after combined orthodontic-periodontal treatment with circumferential fibrotomy. METHODS: Totally 16 periodontal patients with anterior displaced teeth were analyzed after random clinical trialed as groups with and without circumferential fibrotomy of involving teeth followed by orthodontic intrusion. Evaluations of the changes of alveolar bone were given before and after treatment by means of periapical X-ray film and CT scan of the involving teeth. RESULTS: Orthodontic treatment with circumferential fibrotomy can increase the height of crest bone. Alveolar bone height was increased in the patients with circumferential fibrotomy followed by orthodontic intrusion of displaced anterior teeth. Alveolar bone height was increase by 1.2 mm on average in circumferential fibrotomy patient. In the patients with symmetric alveolar bone loss, 0.8 mm increase of alveolar bone height was observed following treatment. For the patients with asymmetric alveolar bone loss, 0.9 mm increase of alveolar bone height was detected in mild bone loss patients, but 1.4 mm and 2.2 mm increase of alveolar bone height were found in moderate and severe bone loss patients, respectively. For patients having the orthodontic treatment without circumferential fibrotomy, the alveolar bone height was increased by 0.1 mm only. Statistic significance was found between the circumferential fibrotomy group and non-fibrotomy group. CONCLUSION: Combined orthodontic-periodontal treatment with circumferential fibrotomy could correct the malpositioned teeth, and improve the periodontium conditions and gain the crest bone.

Adult↗
PubMed2004

[Combined orthodontic-periodontal treatment on periodontal patients with anterior displaced incisors].

OBJECTIVE: Combined orthodontic-periodontal treatment with supracrestal fiberotomy was undergone on the periodontal patients with anterior displacement of incisors. Evaluate of the changes before and after treatment. METHODS: Periodontal indices, periapical x-ray analysis, and model analysis were used for investigating the changes of alveolar bone height and periodontal health by orthodontic treatment following supracrestal fiberotomy of anterior displaced incisors on periodontal patients. RESULTS: Alveolar bone height was increase by 1.2 mm in fiberotomy patients. The overjet was reduced from 7.0 mm to 2.0 mm, while the overbite was decreased from 4.0 mm to 2.0 mm, and the periodontal health maintained as well. CONCLUSION: Combined orthodontic periodontal treatment with supracrestal fiberotomy could correct the malpositioned teeth, and improve the periodontium conditions and gain the crest bone.

Adolescent↗
PubMed2005

[Orthodontics: interface between biology and biomechanics].

As far as craniofacial development is concerned, the orthodontist is mainly interested in growth of the jaws, craniofacial growth patterns and physiologic backgrounds of bone remodelling after tooth displacement. In biomechanics, the principle "action is equal to reaction" is one of the most important issues to deal with. The art in orthodontics is to distribute the reaction forces or to use them on purpose in an attempt to achieve one of the treatment goals. Reaction forces can be neutralized intra-orally. In this respect the location of the center of resistance of the tooth or a group of teeth needs to be defined carefully in order to have a good understanding of the biomechanical principles of tooth displacement. The action forces can be neutralized extra-orally. When no reaction forces on other teeth are applied, there will be no side effects of the reaction forces on other teeth. Research on the biomechanical principles of the headgear does offer some clinical information. Recently in orthodontics, the use of implants has been introduced. It can be used to neutralize reaction forces intra-orally. Moreover, the implants can be used primarily as anchorage during orthodontic tooth movement and later on to replace missing teeth. Recent animal studies at our department have shown that non-axial loading of implants with forces higher than 5 Newton can be used.

Biomechanical Phenomena↗
PubMed2007

Long-term uncontrolled hereditary gingival fibromatosis: a case report.

Hereditary gingival fibromatosis (HGF) is a rare condition characterized by varying degrees of gingival hyperplasia. Gingival fibromatosis usually occurs as an isolated disorder or can be associated with a variety of other syndromes. A 33-year-old male patient who had a generalized severe gingival overgrowth covering two thirds of almost all maxillary and mandibular teeth is reported. A mucoperiosteal flap was performed using interdental and crevicular incisions to remove excess gingival tissues and an internal bevel incision to reflect flaps. The patient was treated 15 years ago in the same clinical facility using the same treatment strategy. There was no recurrence one year following the most recent surgery.

Adult↗
PubMed1991

[Histomorphometrical study of physiological tooth movements in humans].

Quantitative analysis of remodeling activity was done using microradiographs of horizontal ground sections of human alveolar bone obtained from autopsies. The results demonstrated no significant age- or sex-dependent variations. The local distribution of remodeling activity in younger individuals pointed to a tipping mesial movement of the teeth. In older individuals this distribution showed a more random pattern.

Adult↗
PubMed1991

Eicosanoids: physiology update and orthodontic implications.

The eicosanoids are members of a group of substances comprising prostaglandins and leukotrienes which are released by a host of mechanical, thermal, bacterial and other insults and contribute importantly to the signs and genesis of inflammation (Brain and Williams 1990, Dusting 1989 Moncada et al. 1985, Salmon and Higgs 1987). In this review we examine the increasing number of reports on the actions of eicosanoids on the dentoalveolar complex. In addition, since it is desirable for the orthodontist to have a sound knowledge, not only of the roles of eicosanoids in tooth movement, but also of their basic general physiology, an overview of the latter area is presented.

Alveolar Process↗
PubMed1991

Thielemann's diagonal law of occlusion revisited.

Thielemann's studies of malocclusal relationships and the frequently observed chain reactions created in distant localities led to the formulation of a philosophical approach to occlusion that is also of practical premeditative clinical relevance for the practitioner. Dr. Thielemann presumed to name it a law, and repeated clinical observations apparently support and reinforce his claim. All disciplines of dentistry inevitably encounter and need to know about this aspect of fission-reactive involvement with the common and seemingly innocuous malocclusions. By incorporating the law into the diagnostic, planning, corrective, and therapeutic stages of treatment, the clinician can readily categorize patients for needs assessments and future goals in treatment.

Adult↗
PubMed1991

The importance of a coordinated restorative and maintenance program following periodontal therapy: a case report.

The problems arising during the maintenance phase of therapy following a combination of periodontal, orthodontic, and restorative treatment are illustrated by this case report. Emphasis is placed on the combined responsibility of the patient, general dental practitioner, and periodontist to recognize signs of recurrent disease at an early stage, thereby allowing corrective measures to be initiated promptly. By applying these principles, even when disease recurs during the maintenance phase, re-treatment is possible and a satisfactory result can be achieved.

Dental Occlusion, Traumatic↗
PubMed1991

[Posterior bite collapse. 2. Therapeutic proposals].

In the treatment of posterior bite collapse, the orthodontic phase consists of three steps: uprighting of molar teeth, leveling of the mandibular arch and closure of anterior diastemas. During and after orthodontic therapy, the maintenance of periodontal health is important. For patients in which there is a reduced periodontium, splinting should be accomplished after the teeth are moved into their desired position.

Diastema↗