Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “TOOTH ABRASION”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 199 records · Page 11Linked to original sources
PubMedDate not supplied

Effect of restored and unrestored non-carious cervical lesions on the fracture resistance of previously restored maxillary premolar teeth.

OBJECTIVES: The effect of non-carious cervical lesions (NCCL) on tooth fracture resistance has not previously been investigated. The aims of this in vitro study were to examine the fracture resistance of a group of extracted maxillary premolar teeth with mesio-occlusal-distal (MOD) restorations of amalgam, and restored or unrestored simulated NCCL. METHOD: Forty sound maxillary, premolar teeth were divided at random into four groups, each of 10 teeth, which were fixed crown uppermost and long axis vertical in stainless steel moulds. Groups 1,2,3 and 4 were prepared with standardized parallel-sided MOD cavities, then restored with amalgam. Groups 1, 2 and 3 were further prepared with standardized NCCL. The NCCL in Group 1 were restored using a resin-modified polyalkenoate (glass-ionomer) cement, and the NCCL in Group 2 were restored with an adhesive composite resin system. The NCCL in Group 3 were left unrestored. The specimens were loaded compressively at 1 mm min-1 using a universal testing machine. RESULTS: Mean fracture loads (KN) of 1.08, 1.03, 0.98 and 1.14, respectively, were recorded for Groups 1, 2, 3 and 4. Two-way ANOVA and Scheffe's Multiple Range Test showed no statistically significant difference between the groups. CONCLUSIONS: It is concluded that the presence of a standardized NCCL in an extracted maxillary premolar tooth does not reduce the fracture resistance of the tooth when loaded compressively at 1 mm min-1. The restoration of NCCL with the materials tested did not result in an increase in the fracture resistance of the previously restored premolar teeth, when loaded compressively at 1 mm min-1.

Analysis of Variance↗
PubMed1998

Dental corrective procedures.

This article explains what is needed for successful extraction of diseased cheek teeth and how to realign the occlusal surface. Incisor teeth procedures and correcting abnormalities of cheek tooth crown wear are also discussed along with wolf and floating teeth.

Animals↗
PubMed1991

Remodeling of canines to the shape of lateral incisors by grinding: a long-term clinical and radiographic evaluation.

A long-term clinical and radiographic follow-up study was performed after extensive remodeling of the permanent teeth of 26 adolescent patients. The canines were ground to the shape of lateral incisors as part of the orthodontic treatment, and the patients were recalled after 10 to 15 years for clinical examinations. Grinding had been performed either unilaterally or bilaterally on 37 teeth. Unground canines or adjacent teeth served as control or reference teeth. Standardized intraoral radiographs were taken with a paralleling technique. Enamel surface replicas produced by epoxy resin in silicone impressions of the ground teeth were studied by stereomicroscopy. The long-term results were favorable. No significant color differences were observed in 36 of the 37 ground canines. Only one tooth displayed a generalized yellowish discoloration, probably the result of extensive pulp obliteration. There were no significant differences between ground and unground teeth with regard to mobility, reaction to percussion, or temperature sensitivity. Electric pulp testing revealed no statistically significant differences between test and control teeth. Radiographic changes were evident in two of the 37 ground canines. One tooth showed marked obliteration of the crown pulp, and in another tooth the pulp obliteration was almost complete. In the remaining 35 teeth no apparent differences were noted between the ground and unground teeth. In the stereomicroscope two of the ground labial surfaces showed evidence of scratches and grooves produced by the diamond instrument after more than 10 years' observation, but in all other instances the ground surfaces were indistinguishable from normal adult enamel surfaces. In conclusion, the present study has demonstrated that extensive cuspal, labial, lingual, and interproximal recontouring by the grinding of young teeth associated with orthodontic treatment can be performed without discomfort to the patients and with only minor or no long-term clinical and radiographic reactions.

Child↗
PubMed1997

Guidelines for managing the orthodontic-restorative patient.

Occasionally, patients require restorative treatment during or after orthodontic therapy. Patients with worn or abraded teeth, peg-shaped lateral incisors, fractured teeth, multiple edentulous spaces, or other restorative needs may require tooth positioning that is slightly different from a nonrestored, nonabraded, completely dentulous adolescent. Generally, orthodontists are not accustomed to dealing with patients who require restorative intervention. Should the objectives of orthodontic treatment differ for the restorative patient compared with the nonrestorative patient? How should the teeth be positioned during orthodontic therapy to facilitate specific restorations? Should teeth be restored before, during, or perhaps after orthodontics? The answers to these and other important questions are vital to the successful treatment of some orthodontic patients. This article will provide a series of eight guidelines to help the interdisciplinary team manage treatment for the orthodontic-restorative patient.

Dental Restoration, Permanent↗
PubMed1996

Clinical evaluation of an illuminated dental mirror.

The purpose of this study was to determine whether the use of an illuminated mirror improved a dental student's ability to detect oral disease or abnormalities and whether an oral examination could be conducted more efficiently with it when compared with the use of a conventional mirror and chair-mounted light source. Students examined patients with the illuminated mirror and with a standard dental mirror for caries, defective restorations, dental staining, etc. Students were observed to determine how often they adjusted the overhead light or shifted their positions to see better and the length of time the examination was noted. After each examination, students were asked to rate how well they could see in various intraoral sites. There was no difference in specificity ratios between the two techniques, and the only significant difference (p < or = 0.05) in sensitivity ratios was in the detection of caries. There was no difference in the number of position shifts or length of examinations; students made fewer external light adjustments when using the illuminated mirror. On a 10-point scale, students rated their ability to see intraorally better with the illuminated mirror.

Dental Caries↗
PubMedDate not supplied

Associated postmortem dental findings as an aid to personal identification.

The use of the unique features of the human dentition to aid in personal identification is well accepted within the forensic field. Indeed, despite advances in DNA and other identification methodologies, comparative dental identifications still play a major role in identifying the victims of violence, disaster or other misfortune. The classic comparative dental identification employs the use of postmortem and antemortem dental records (principally written notes and radiographs) to determine similarities and exclude discrepancies. In many cases the tentative identification of the individual is unknown and therefore antemortem records cannot be located. In such a situation a dental profile of the individual is developed to aid the search for the individual's identity. With such a profile a forensic odontologist can identify and report indicators for age at time of death, race (within the four major ethnic groups) and sex. In addition to these parameters the forensic dentist may be able to give more insight into the individual. This paper outlines, for the non-expert, some of the additional personal information that can be derived from the teeth of the deceased, and which may assist in their ultimate identification.

Forensic Dentistry↗
PubMed2001

Tooth substance loss resulting from mechanical, sonic and ultrasonic root instrumentation assessed by liquid scintillation.

AIMS: This study investigated the loss of tooth substance (microg) by means of liquid scintillation in combination with profilometric and SEM analyses in order to evaluate the roughness and morphological changes of the root surface before and after instrumentation. METHOD: 40 polished and irradiated bovine root surfaces were scaled in vitro while covered with 50 ml distilled water using a sonic prototype (Periosonic 1/2), a magnetostrictive ultrasonic (Cavitron with Slimline inserts) scaler and a hand curette. Pressures were applied for the Periosonic, Cavitron and hand curette at 500, 500 and 30 g respectively, for 30-s intervals, up to 120 s. Loss of apatite (microg) was determined from the decays/min (32P) of the water samples using the radiochemical method of liquid scintillation. Replicas were made of the specimens for SEM and profilometric analyses. RESULTS: The least substance loss was noted significantly (p<0.01) at all time intervals after Slimline, followed by the fine sonic prototype Periosonic 2, then the Periosonic 1 and finally the hand curette. In contrast, profilometric and SEM analyses revealed the smoothest root surfaces after the hand curette, whereas Cavitron produced a less smooth surface. CONCLUSION: It can be concluded that this method can reveal very precisely small quantities of substance lost and, in combination with SEM analysis and microroughness measurements, be of considerable value in evaluating the aggressiveness and efficacy of periodontal instruments.

Animals↗
PubMed2002

Clinical evaluation of cervical dentin sensitivity (CDS) in patients attending general dental clinics (GDC) and periodontal specialty clinics (PSC).

AIM: The objective of this study was to compare the prevalence, severity and distribution of CDS in patients attending general dental clinics (GDC) and periodontal specialty clinics (PSC) and to correlate them to possible causal factors. MATERIAL AND METHODS: 2 groups of patients aged 20-60 years recruited from GDC (144) and PSC (151) were evaluated for CDS by means of a questionnaire and intraoral clinical examinations. Furthermore, gingival recession and plaque scores were recorded at the same visit. RESULTS: The results showed that patients referred to PSC had a significantly higher prevalence of CDS (60.3%) than those examined at GDC (42.4%) (p<0.001). Also, mean plaque scores of PSC patients (1.87 +/- 0.88) was found to be significantly higher than that of GDC (1.44 +/- 0.7) (p<0.01). The occurrence and extent of gingival recession associated with hypersensitive teeth was significantly higher in PSC than GDC patients (p<0.01), with a 5% incidence of severe recession (5 mm) in PSC only. The association of periodontal disease and periodontal treatment to the high prevalence of CDS and gingival recession in PSC patients would suggest their role in predisposition to hypersensitivity. The distribution of CDS in tooth types revealed that upper molars and lower anteriors of PSC patients were mainly affected, and followed by, to a lesser extent, lower right canine and right first molars of GDC patients. CONCLUSION: The prevalence of CDS among our periodontal patients appears somewhat lower than that reported in periodontal specialty clinics of earlier studies but still higher than those reported in other dental populations. This indicates that periodontal disease and its treatments may increase the occurrence of hypersensitivity.

Adult↗
PubMed2003

Analysis of etiologic factors and periodontal conditions involved with 309 abfractions.

OBJECTIVES: Non-carious cervical lesions (NCCL), also termed abfractions, have long been thought to be produced by excessive brushing. Nearly 20 years ago an occlusal etiology was proffered (Lee & Eagle 1984). Controversy still exists concerning these two concepts. The present work was carried out to verify the occurrence of signs of excessive brushing or occlusal disturbances associated with abfractions. MATERIAL AND METHODS: All first consultants were screened for the presence of abfractions during one trimester. NCCL were found in 61 patients who consequently received a thorough examination searching for clinical evidence of excessive brushing or occlusal disturbances. The presence of plaque, calculus, periodontitis, or mobility was also noted. Simple frequency and percentage were used to describe the occurrence of different clinical signs in association with the presence of abfractions. RESULTS: Abfractions often exist in mouths presenting plaque (40.1%), calculus (41.7%), or periodontitis (20.4%). Ulceration of the gingiva is a rare finding (1.6%). However, subgingival apical limits were frequent (32.5%). NCCL coexist almost systematically with occlusal wear facets (94.5%). Lack of canine disclusion (77.2%) was also closely associated with the presence of abfractions. Conversely, mobility was seldom found (1.9%). CONCLUSIONS: Clinical signs of excessive brushing were lacking, whereas signs of occlusal disturbance were very consistent with the presence of abfractions.

Adult↗
PubMed2003

Abfraction lesion formation in maxillary incisors, canines and premolars: a finite element study.

Abfraction lesions are angular, wedge-shaped defects found at the cervical region of teeth and are caused by mechanical overloading initiated by cuspal flexure. Clinically, these lesions are more prevalent on the labial aspect of maxillary incisors. The aim of this study was to provide a biomechanical explanation for this clinical variation. Two-dimensional plane strain finite element models of an maxillary incisor, canine and first premolar were developed and the cervical stress profiles were examined along a horizontal plane 1.1 mm above the amelo-cemental junction. The local X (horizontal) stress on the labial/buccal side was 176.4 MPa for the incisor, 57.8 MPa for the premolar, and 3.4 MPa for the canine. Similarly, the maximum labial/buccal principal stress was 181.4 MPa for the incisor, 25.2 MPa for the premolar, and 66.8 MPa for the canine. The labial/buccal stress profile in the cervical region of an maxillary incisor was always greater than that found in an maxillary canine or premolar tooth. These findings provide a biomechanical explanation for the clinical variation seen in the prevalence of cervical abfraction lesions.

Bicuspid↗
PubMed1999

Occlusion and splint therapy.

Control of occlusal contacts is important to the success of restorative dentistry. Tooth surface loss can contribute to a loss of stability in the occlusion. An occlusal splint is often part of pre-restorative management and can also have a valuable role in protecting both teeth and restorations from excessive loads and further wear.

Dental Materials↗
PubMed1999

Removable prostheses.

Reconstruction of the dentition extensively damaged through tooth surface loss may require the use of removable prostheses. This can be the most appropriate type of treatment when either the teeth are very severely worn or the patient wishes a simpler and more economical approach than a fixed reconstruction.

Adult↗
PubMed1999

Adhesive techniques.

This paper describes the use of adhesive techniques to restore teeth previously affected by tooth surface loss so avoiding the need to remove sound tooth tissue.

Dental Cements↗
PubMed1999

Tooth surface loss. 11. Surgical crown lengthening.

Restoration of worn teeth can be made easier by surgical crown lengthening. It improves appearance and facilitates tooth preparation. Anatomical features can limit the height that can be gained.

Crown Lengthening↗