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At least 19 recordsLinked to original sources
PubMed1977

Gingival recession and tooth mobility.

Tooth mobility measurements were carried out on 107 teeth with gingival recession in 20 subjects. Alveolar bone dehiscence around 43 of these teeth was measured during flap surgery in 13 subjects. No significant correlation was found between gingival recession and tooth mobility, and between tooth mobility and alveolar bone dehiscence. A positive, significant correlation was present between gingival recession and bone dehiscence. In 17 of the subjects, tooth mobility of 29 homologous contralateral teeth with and without gingival recession was compared. The difference was not significant. The role of trauma from occlusion in the etiology of gingival recession is questioned.

Adolescent↗
PubMed1989

[Study on two-dimensional tooth mobility].

Tooth mobility was measured with the use of a two-dimensional displacement measuring system. This small-sized system can measure the displacement both in the direction of the tooth axis and the buccolingual direction simultaneously with no contact. As test teeth, lower right first premolars with no clinical mobility were examined. The load was applied from the lingual to the buccal direction, to the vertical direction as well as from the buccal to the lingual direction. The results obtained were as follows: 1. This system possesses sufficient accuracy and reproducibility for tooth mobility measurement (measurement range 500 microns, resolving power 1 microns). 2. Most of the load-displacement curves showed diphasic displacement. 3. As to the amount of displacement in the buccolingual direction, 3 of 8 cases showed greater values by the load in the buccal direction and the remaining 5 by the load in the lingual direction. 4. As to the displacement direction of loaded teeth, the lingual and buccal load displaced teeth to the lingual-coronal and buccal-radicular directions respectively. Teeth under the vertical load were displaced almost to the radicular and slightly to the buccal direction. 5. As to the direction of tooth displacement in relation to load directions, it appeared that the teeth not only rotated within the dental sockets but also indented or extruded into the dental sockets.

Dental Stress Analysis↗
PubMed1993

[The mobile tooth--the theoretical bases and practical implications of a frequent clinical problem].

In the past, especially in the 1970s, tooth mobility has been largely studied by various research groups. Since then, scientific interest in this domain has progressively decreased. However, from a clinical point of view tooth mobility has remained an important concern. This paper aims to review and update basic theoretical notions of tooth mobility after evaluation of recent studies. Finally, clinical implications are discussed.

Biomechanical Phenomena↗
PubMed1975

The use of laser beams for measuring tooth mobility and tooth movements.

The laser reflexion method, a direct contactless measuring technique with a high accuracy, has been applied for clinical purposes. A prototype has been tested using a laser beam to illuminate a patient's tooth fixed to the equipment by an impression plate. The reflected patterns were thrown onto a screen with a coordinate system and photographically recorded, and the movement of the tooth has been geometrically calculated. The relapse tendency after orthodontic treatment of a patient with periodontal disease and parafunctions was studied by repeated measurements of the left medial upper incisor. By use of the method, it was possible to observe that the velocity of the studied tooth was highest during the 1st day and, besides the horizontal movement, a rotation of the tooth began at the end of the measuring period.

Adult↗
PubMed2002

Prevalence of periodontal pocketing and tooth mobility according to tooth types in Nigerians--a pilot study.

The aim of the present study was to evaluate the occurrence of periodontal pocketing and tooth mobility according to the tooth types in the mouth. There is a paucity of knowledge concerning which tooth types are more prone to periodontal disease from the review of literature. The study sample comprised 255 subjects, age ranged 16 years to 74 years. These subjects were those referred to the Periodontology Clinic of the University College Hospital, Ibadan, Nigeria, for one form of periodontal disease or the other. All the teeth were tested for periodontal pocketing using William's periodontal probe (Astir Intermedica, Kensington, London) and for tooth mobility using the Miller's Mobility Index method. The study showed that prevalence of tooth mobility is in this descending order--lower incisors, upper incisors, upper first molars, upper second molars, lower first and second molar, the premolars and lastly, the canines with the least occurrence on the upper left canines. This order is slightly different for prevalence of periodontal pocketing. The teeth most affected by pocketing were the upper second molars, followed by upper first molars, lower second molars with the least being the canines. It is suggested that exceptional care be given to these most susceptible teeth for periodontal disease in the mouth in order to prevent the development of irreversible damage of the periodontium.

Adolescent↗
PubMed1980

Assessment of tooth mobility using small loads. I. Technical devices and calculations of tooth mobility in periodontal health and disease.

An apparatus for recording tooth mobility of maxillary anterior teeth using loads below 100 p in a bucco-lingual direction is described. Strain gauges and a differential transformer are used as sensors of force and displacement. The displacement is recorded at the same location on the tooth surface and in the same direction as the loading force. Compressed air is used as the source of force. Documentation of signals is obtained by means of a two-channel potentiometric recorder. Tooth mobility was studied in six subjects with healthy periodontal conditions and in six subjects with moderate periodontal disease. Repeated measurements under standardized conditions demonstrated a satisfactory reproducibility of the measuring method. Tooth mobility curves within the 20-80 p loading range were transformed to lines of regression. Analysis of such lines seems to provide further information of tooth mobility qualities as compared to previous methods of tooth mobility measurements.

Dental Stress Analysis↗
PubMed1989

Application of mechanical mobility of periodontal tissues to tooth mobility examination.

Tooth mobility examination is important in planning dental treatment, as it may give an indication of alveolar bone loss and the condition of the periodontal ligament. In clinical dental diagnosis a manual tooth mobility examination is useful. However, its determination of tooth mobility is subjective and depends on the skill and experience of the clinician. The authors have previously reported on a device for measuring the biomechanical properties of human periodontium using an impedance head. Using this device, the mechanical mobility of periodontium can be measured and the mechanical parameters of the periodontal physical model are obtained. Tooth mobility is defined objectively on the basis of discriminant scores of mechanical parameters, and a mobility triangle (MT) figure is drawn as a record for visual interpretation. The paper describes the validation of the mechanical mobility measurements and their interpretation using mobility parameters and a personal computer to produce a mobility triangle figure. The method is compared favourably with clinical mobility measurement. The relationship of the model to underlying pathology is tested by measurements performed on various tooth model systems.

Biomechanical Phenomena↗
PubMed1994

Determination of the tooth mobility change during the orthodontic tooth movement studied by means of Periotest and MIMD (the mechanical impedance measuring device for the periodontal tissue).

Two mechanical devices were selected to attempt to assess any changes in tooth mobility when orthodontic force was applied. A Periotest (PT) for assessing mobility and a mechanical impedance measuring device (MIMD) were the instruments chosen to diagnose the changes in the periodontal condition. The relative mobility of four canines after orthodontic tooth movement manipulation was assessed over a 4-week period. Both devices were able to detect very small changes in tooth mobility and could follow the changes during tooth movement. According to the Periotest unit, the tooth mobility changes were not within the clinically abnormal range, despite the initial retraction load from a sectional arch, applied in a horizontal direction with about 150 gm for each tooth. In all instances, the contiguous maxillary first premolar had been removed 1 to 2 months before force application. The tooth mobility observed in this investigation could be different from that caused by periodontal disease or traumatic injury. Just after orthodontic tooth movement manipulation, the Periotest values (PTV), as measured on the Periotest, of tooth mobility decreased and the resistance as measured by the mechanical impedance measuring device (MIMDM) was increased. Thus, initially, there is a greater resistance to movement with decreased mobility. After the experimental period of 4 weeks, there was an increase in the mobility, as measured by the Periotest and the mechanical resistance decrements were observed. However, the Periotest units showed some different changes occasionally that did not seem to reflect the state of tooth movement. This needs to be investigated further over a longer period of time. On the basis of the results obtained, it does appear that it is feasible to use these devices to determine mobility changes in patients at various stages of orthodontic treatment.

Cuspid↗
PubMed1989

[Biomechanical study on orthodontic tooth movement: changes in biomechanical property of the periodontal tissue in terms of tooth mobility].

The magnitude of tooth mobility has been frequently used for evaluating biomechanical response of the periodontal tissue to applied forces. However, tooth mobility during orthodontic tooth movement has not been measured. The purpose of this study was to investigate changes in biomechanical property of the periodontal tissue during canine retraction, in terms of tooth mobility. The upper canines on both sides of ten orthodontic patients were moved in the distal direction for about four weeks with an initial force of 200 gf. An amount of tooth movement and a magnitude of tooth mobility were measured every 3 or 4 days during retraction. A distally directed force up to 500 gf was continuously applied to each canine and tooth mobility was measured with a noncontact type of eddy current displacement sensor. A two-dimensional finite element model was constructed and displacements of the finite element model were calculated with various Young's moduli in loading with a 100 gf force in the distal direction. In comparison with the magnitudes of the tooth mobility, Young's modulus of the periodontal membrane before retraction and the influence of the biomechanical factors on changes in tooth mobility were investigated. The tooth movement curve was divided into three phases; an initial phase, a lag phase and a post-lag phase. The magnitudes of tooth mobility at the initial phase were significantly larger than those before retraction within the range of 250 gf to 500 gf and these magnitudes decreased during the lag phase. The magnitudes of tooth mobility at the post-lag phase significantly increased, within the range of 50 gf to 500 gf, than those before retraction. As a result of curveliniar regression analysis, the tooth mobility curves approximated to delta = AFB, where delta and F denote tooth mobility and force respectively. The coefficients A and B changed according to the phases of tooth movement. An inclination of the tooth mobility curve expressed by a tangent at the 400 gf force was the largest at the initial phase, and this inclination at the 100 gf force was the largest at the post-lag phase. Young's modulus of the periodontal membrane before retraction was determined to be approximately 35 gf/mm2 and Young's modulus of the periodontal membrane was the most important factor on the increase of tooth mobility. Tooth mobility significantly varied associated with tooth movement. It was indicated that biomechanical property of the periodontal tissue changes in response to each phase of tooth movement. In particular, Young's modulus of the periodontal membrane decreased at the post-lag phase of the orthodontic tooth movement.

Cuspid↗
PubMed1990

Automatic diagnosis system of tooth mobility for clinical use.

The examination of tooth mobility gives valuable clinical findings on pathological change in the periodontium. An automatic diagnosis system has been developed for the quantitative evaluation of tooth mobility. Tooth mobility was determined from the vibration characteristics of the periodontium and expressed in terms of such objective biomechanical parameters as stiffness and two damping coefficients. These were displayed on a monitor CRT as a triangular figure. This system is composed of a probe, which comprises a vibrator and acceleration transducers, and a data analysis unit using a personal computer. A dentist can measure the tooth mobility without assistance with a foot-switch to trigger the computer operation. The reliability and the operational facility of the system are considered to be sufficient that it may be used in daily clinical practice. Data were collected from healthy and pathological teeth. The tooth mobility of the pathological tooth and the time course of the change in the mechanical parameters after implantation of the tooth were measured by this system. The advantages of this system compared with previous one, which was also developed by the authors, are discussed.

Adult↗