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At least 37 records · Page 2Linked to original sources
PubMed1988

The relationship between mandibular morphology and apical root curvature in man.

Two samples of individuals, a low-angle group and a high-angle group, were selected on the basis of the inclination of the lower border of their mandible, defined by the mandibular plane angle (ML/SNL) in profile radiographs. Apical root curvature of mandibular first and second premolars and molars on panoramic radiographs was compared between the two groups and related to mandibular morphology. In the low-angle group most teeth had more distally curved roots than in the high-angle group. Significant differences were found for the first premolars on both sides (p less than 0.001, p less than 0.05), the right second premolars (p less than 0.05) and the distal root of left first molars (p less than 0.05). Correlations were calculated between root curvature and two variables reflecting mandibular morphology, the mandibular plane angle and the gonial angle. The strongest associations were found between the first premolar roots and the gonial angle (rs = -0.75, p less than 0.001 and rs = -0.56, p less than 0.01, for right and left sides respectively). The association between mandibular morphology and root curvature is probably indirect, caused by tooth migration during root formation.

Bicuspid↗
PubMed1985

Tooth eruption and migration theories: can they account for the presence of a 13,000-year-old mesiodens in the vault of the palate?

A case of a mesiodens in the vault of the palate of a skull estimated to be approximately 13,000 years old is presented. The currently cited theories of tooth eruption were considered, and it was concluded that only the newly formulated BVT (blood vessel thrust) theory of tooth eruption can account for the migration of this mesiodens into that position.

Alveolar Process↗
PubMed1990

[Experiences with Burstone's segmented arch technic in the adult dentition].

In comparison to the straight wire technique the segmental arch approach offers numerous biomechanical and clinical advantages. Three typical examples: controlled tooth movement, en masse space closure and deep overbite correction serve to show the spectrum and the efficiency of the segmented arch technique.

Adult↗
PubMed1976

The role of fibroblasts in the remodeling of periodontal ligament during physiologic tooth movement.

Our findings indicate a cellular basis for the connective tissue remodeling which takes place during physiologic tooth movement. This cell is the fibroblast which is capable of synthesizing and degrading collagen simultaneously and, utilizing this ability, the orderly control of collagen remodeling within the periodontal ligament is possible. It is suggested that this cellular basis of connective remodeling will have a direct significance for orthodontic tooth movement once control mechanisms have been established.

Amino Acids↗
PubMed1976

The influence of transseptal fibers on incisor position and diastema formation.

Transseptal fibers are a part of the gingival group of fibers of the periodontal membrane, and they are very tough and resistant. They form a chain from tooth to tooth which, provided that it remains intact and is sufficiently strong to resist displacing muscular pressures, will preserve the contacts between the teeth throughout the arch. If the continuity of the chain is interrupted, the balance of the forces acting upon the teeth on either side of the break is upset and considerable displacements can occur. Maxillary median diastemas are classified as "simple" or "persistent" according to their etiology, and an operation to clear the upper midline suture of transeptal fibers is described as an essential part of the treatment of persistent upper median diastema.

Child↗
PubMed1986

Differential diagnosis and treatment planning for the adult nonsurgical orthodontic patient.

Increasing numbers of adult patients are seeking orthodontic care and some, despite significant skeletal malocclusions, elect not to have combined orthodontic-surgical treatment. The purpose of this article is to outline some of the diagnostic and therapeutic principles that can be used in the adult nonsurgical orthodontic patient. The importance of realistic goal setting in the face of compromised occlusions is emphasized. Diagnosis should include evaluation of all three dimensions and recognize the limitations of therapy in each dimension for the nongrowing patient. Periodontal considerations, extraction decisions, and retention regimens are of vital importance to the achievement and maintenance of an optimum result. Clinical records will demonstrate four commonly seen problems and their resolution.

Adolescent↗
PubMed1989

Orthodontic therapy for the restorative patient. Part I: The biomechanic aspects.

The integration of interspecialty treatment before the restorative and prosthodontic efforts of the dentist can eliminate conditions that have the potential to jeopardize successful completion of the proposed treatment. Adult dentitions that have deteriorated because of neglect, fear, caries, extractions, or trauma can be restored to stability, health, function, and esthetics. In "Part I, The biomechanic aspects," the orthodontic paralleling of proposed abutment teeth displays premolar (buccolingual) and molar (mesiodistal) uprighting procedures that achieve improved force distribution to these teeth. Molar intrusion (occlusoapical) to improve an occlusal plane distribution of adverse forces to the proposed opposing fixed partial denture is discussed. These vexing problems facing successful reintegration of the altered states of occlusal relationships frequently can be answered by the incorporation of preprosthodontic corrections.

Adult↗
PubMed1992

The effects of infraocclusion: Part 2. The type of movement of the adjacent teeth and their vertical development.

This second article discusses how the inclusion of a vertical component (the infraocclusion of the deciduous molar) into the otherwise horizontal band of transseptal fibers affects the vertical development of the two adjacent teeth. From the hypothesis proposed in the first article of this series, it seemed logical to assume that the occlusal heights of the teeth adjacent to the affected tooth would themselves be lowered, when measured to the inferior border of the mandible and compared with the height of the occlusal table of the control side. Secondly, since the vertical component affects only one side of each adjacent tooth, these teeth would be tilted about a center of rotation which is much higher (coronal) than is seen in a tooth that merely tips forward as the result of available space in the immediate vicinity in the arch. In this study, both these assumptions were confirmed, with a very high degree of statistical significance.

Bicuspid↗
PubMed1985

Transmigration of impacted mandibular cuspids.

Transmigration of impacted mandibular cuspid is a rare finding. A cuspid is classified as "transmigrated" when more than half of its length has passed the mid-line. 13 cases of transmigration of impacted mandibular cuspids are presented, 3 of which occurred in pairs, raising the total number of teeth to 16. Radiographs showed positions ranging from a vertical impaction, to a cuspid having crossed the mid-line completely, reaching the first molar area of the opposite side.

Adolescent↗
PubMed1990

Experimental study of the effect of prostaglandin administration on tooth movement--with particular emphasis on the relationship to the method of PGE1 administration.

Recently, the mechanism of action of prostaglandins in promoting bone resorption has received wide attention. Prostaglandins are used in orthodontics to shorten the period of tooth movement. PGE1 was administered locally (5 micrograms/kg every 12 hours) and systemically (7.5 ng/kg/min) to rats to study the difference in the efficacy of the two methods of administration in accelerating bone resorption. The Waldo method was used on 72 Wistar rats (8 weeks old) for 5 days to induce mesial movement of the first molar. The body weight of the rats was measured every 12 hours from the start of the experiment. Tissues were examined in the mesial surface of the mesial root and in the interradicular septum between the linguomesial root and the linguodistal root of the upper first molar. The pressure side of the mesial surface of the mesial root was studied, as well as the pressure side of the interradicular septum. The results showed that decrease in body weight during the experiment was more prominent in the local administration group than in the systemic administration group. In both the group receiving PGE1 through local administration and the group receiving PGE1 through systemic administration, the numbers of osteoclasts and Howship's lacunae were markedly increased over those in the control groups. Moreover, compared with local administration, systemic administration of PGE1 had a more marked effect on bone resorption.

Alprostadil↗
PubMed1990

Late lower arch crowding: the effect of second molar extraction.

Mesial drift and change in crowding over a 5-year period were compared in 30 subjects whose lower second molars were extracted between ages 11 and 17 years and 30 subjects whose lower second molars were not extracted. Significant differences were found. The nonextraction subjects showed an average forward movement of first molars and an increase in crowding. The extraction group showed slight distal movement of first molars and a decrease in crowding. It is concluded that lower second molar extraction reduces the tendency to forward movement of buccal segments and increased crowding by relieving eruptive pressure from third molars and that the presence of a developing lower third molar with insufficient space can be one cause of late lower arch crowding.

Adolescent↗