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PubMed2006

Gingival recession and pathologic migration due to an unusual habit.

Various etiologies are implicated as causes of gingival recession and pathological tooth migration, most prevalent among these being the tissue destruction caused by periodontal pathogens. One of the least documented causes is a parafunctional habit, such as digit-sucking or sucking on objects like pencils, pens or toothpicks, all of which can lead to adverse effects on the dentition and the periodontal tissues resulting in midline diastema, alveolar bone loss, gingival recession, mobility, and ultimately tooth loss. This case report describes the periodontal injury caused by an unusual habit of placing a coin between the mandibular anterior teeth. The potential effects of this habit on the dentition and periodontium are discussed; the preventive measures to be taken and the outline for the management of such cases, to ensure periodontal health of the patient are dealt with in this report.

Adolescent↗
PubMed1985

The blood-vessel thrust theory of tooth eruption and migration.

The Blood-Vessel Thrust Theory is a new hypothesis regarding the forces which produce the normal eruption of teeth, and the movement of 'nonerupted' teeth through bone away from their normal position in the jaws. It points out that the flow of blood through the vessels of the dental pulp, and of the tissues surrounding the tooth, must produce hydrodynamic and hydrostatic forces within the blood vessels, and that these forces have a resultant towards the tooth crown, thus causing the tooth to move, crown first, through the bone during normal eruption or abnormal tooth migration.

Humans↗
PubMed2001

Occlusal stability in shortened dental arches.

Shortened dental arches consisting of anterior and premolar teeth have been shown to meet oral functional demands. However, the occlusal stability may be at risk as a result of tooth migration. The aim of this nine-year study was to investigate occlusal stability in shortened dental arches as a function over time. Occlusal stability indicators were: 'interdental spacing', 'occlusal contacts of anterior teeth in Intercuspal Position', 'overbite', 'occlusal tooth wear', and 'alveolar bone support'. Subjects with shortened dental arches (n = 74) were compared with subjects with complete dental arches (controls, n = 72). Repeated-measurement regression analyses were applied to assess age-dependent variables in the controls and to relate the occlusal changes to the period of time since the treatment that led to the shortened dental arches. Compared with complete dental arches, shortened dental arches had similar overbite and occlusal tooth wear. They showed more interdental spacing in the premolar regions, more anterior teeth in occlusal contact, and lower alveolar bone scores. Since the differences remained constant over time, we conclude that shortened dental arches can provide long-term occlusal stability. Occlusal changes were self-limiting, indicating a new occlusal equilibrium.

Adult↗
PubMed1995

Retention of teeth with reduced root length through use of a resin-bonded splint: a case report.

Orthodontic relapse and tooth migration are commonly observed in patients with severe postorthodontic root resorption. If conventional removable retention is not adequate, fixed splint retention is necessary. Proponents of flexible splints suggest that the difference in mobility between natural teeth and the rigid systems is responsible for the loss of cement seal in the rigid systems. Proponents of rigid splints suggest that the flexibility that allows physiologic movement of the teeth also contributes to fatigue and subsequent failure of the material in the flexible splint systems. A clinical technique for increasing retention, consequently improving the prognosis of a resin-bonded fixed splint, is described.

Adolescent↗
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↗
PubMed2007

Mesial migration effect on root morphology of mandibular third molars.

OBJECTIVE: To test the hypothesis that there is a relationship between forward mandibular third molar migration and root curvature of the mandibular third molars. MATERIALS AND METHODS: The study is comprised of 64 patients who had a history of unilateral mandibular first molar extraction before 16 years of age with no other missing teeth or prosthetic restorations in the mandible. The extraction space was fully or partly closed. The mean remaining space was 1.1 +/- 0.41 mm. The root angles for the mesial and distal roots of the mandibular third molars were measured on the panoramic radiographs by calculating the differences between the angle formed by the long axis drawn perpendicular to the occlusal plane of the crown of mandibular third molar and the central line of the lower one ninth of the root through the root apex. The differences between the extracted and nonextracted sides for mesial and distal roots were analyzed using a paired sample t-test. RESULTS: Both mesial and distal roots were approximately 8 degrees more vertical on the extraction sides than on the nonextraction sides. The differences were statistically significant. CONCLUSION: Mesial tooth migration of mandibular third molars reduces the amount of root curvature developing on this tooth.

Adolescent↗
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↗
PubMed1999

[A very unusual complication of the extraction of a wisdom tooth].

We report here a case of a 42-year-old man who presented a major complication during wisdom tooth extraction. Secondarily after an extraction attempt to tooth migrated into the temporal fossa which required hemi-coronal surgical removal. We present a description of the surgical technique.

Adult↗
PubMed2004

[Removable prosthesis in a 4-year-old child with nursing bottle caries and possible ectodermal dysplasia].

This case report represents a child that needed, at the age of 3, dental treatment under narcosis due to nursing bottle caries including multiple extractions. Six months later the few remaining teeth were again seriously affected by decay. Due to the medical history of urological problems, abnormal aspect of hair and skin and abnormal forms of primary teeth (only reported by the parents), there was a presumption of ectodermal dysplasia, so the patient was referred to the department of medical genetics. Genetic research is still going on. We decided to restore the remaining teeth in ambulant care with plastic restorations and stainless steel crowns. On demand of the parents, we decided to provide the child with a removable denture to increase his self-confidence. The child has now reached the age of 6 and has well accepted the removable denture. These served furthermore as an appliance to maintain space and prevent tooth migration. Removable dentures in young children can be a successful intermediate solution by lack of primary teeth.

Anodontia↗
PubMed1993

Oral-dental findings in a case of Maffucci's syndrome.

A case of Maffucci's syndrome (MS) in a 17-year-old Caucasian female is presented with a thorough intraoral examination. The prominent finding was recurrent gingival hyperplasia affecting both the free and attached gingiva with deep periodontal pockets, tooth mobility, pathological tooth migration, and severe alveolar bone loss. Furthermore, the pattern of alveolar bone destruction, in many ways, resembled that of localized juvenile periodontitis. Although there is always the possibility that these oral features may not be related with the syndrome, we suggest a careful dental and periodontal examination in future cases, which we believe will help develop a better description of oral findings in MS.

Adolescent↗
PubMed2006

Inferring parrotfish (Teleostei: Scaridae) pharyngeal mill function from dental morphology, wear, and microstructure.

Morphology, occlusal surface topography, macrowear, and microwear features of parrotfish pharyngeal teeth were investigated to relate microstructural characteristics to the function of the pharyngeal mill using scanning electron microscopy of whole and sectioned pharyngeal jaws and teeth. Pharyngeal tooth migration is anterior in the lower jaw (fifth ceratobranchial) and posterior in the upper jaw (paired third pharyngobranchials), making the interaction of occlusal surfaces and wear-generating forces complex. The extent of wear can be used to define three regions through which teeth migrate: a region containing newly erupted teeth showing little or no wear; a midregion in which the apical enameloid is swiftly worn; and a region containing teeth with only basal enameloid remaining, which shows low to moderate wear. The shape of the occlusal surface alters as the teeth progress along the pharyngeal jaw, generating conditions that appear suited to the reduction of coral particles. It is likely that the interaction between these particles and algal cells during the process of the rendering of the former is responsible for the rupture of the latter, with the consequent liberation of cell contents from which parrotfish obtain their nutrients.

Animals↗
PubMed2003

Tooth wear and the "design" of the human dentition: a perspective from evolutionary medicine.

Worn, flat occlusal surfaces and anterior edge-to-edge occlusion are ubiquitous among the dentitions of prehistoric humans. The concept of attritional occlusion was proposed in the 1950s as a hypothesis to explain these characteristics. The main aspects of this hypothesis are: 1) the dentitions of ancient populations in heavy-wear environments were continuously and dynamically changing owing to life-long attritional tooth reduction and compensatory tooth migration, 2) all contemporary humans inherit these compensatory mechanisms, and recent reduction in wear severity has resulted in failure to develop attritional occlusion, and 3) this failure leads to an increased frequency of various dental problems in modern societies. Because of the potential significance of this concept, we review and synthesize relevant works and discuss attritional occlusion in the light of current knowledge. Available evidence, on balance, supports the first and second points of the hypothesis. As noted by many workers, the human dentition is basically "designed" on the premise that extensive wear will occur, a conclusion that seems reasonable when one realizes that humans evolved in heavy-wear environments until relatively recently. Some dental problems in contemporary societies appear to reflect the disparity between the original design of our dentition and our present environment, in which extensive wear no longer occurs, but this possibility still needs further investigation.

Adaptation, Physiological↗
PubMed1996

Tooth eruption: theories and facts.

The mechanisms of tooth eruption (i.e., the answer to the question of how and why teeth erupt) has been a matter of long historical debate. This review focuses on human and other mammalian teeth with a time- and spacewise limited period of eruption and analyzes recent observations and experimental data on dogs, rats, primates, and humans in a framework of basic biological parameters to formulate a guiding theory of tooth eruption. Acknowledging basic parameters (i.e., that teeth move in three-dimensional space, erupt with varying speed, and arrive at a functional position that in inheritable) eliminates a number of previously held theories and favors those that accommodate basic parameters, such as alveolar bone remodeling in association with root elongation, with possible correction factors in the form of cementum apposition and periodontal ligament formation. We have critically analyzed, summarized, and integrated recent findings associated with preeruptive movements of developing teeth, the intraosseous stage of premolar eruption in dogs, molar eruption in rodents, and premolar and molar eruption in primates. The variable speeds of eruption are particularly important. We conclude with basic principles of tooth eruption--that is, the type of signals generated by the dental follicle proper, the conditions under which teeth are moved and the clinical understanding to be derived from this knowledge.

Animals↗