SEARCH · PubMed Health

Results for “Tooth Wear”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

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

At least 505 records · Page 28Linked to original sources

PubMed1998

Digital assessment of occlusal wear patterns on occlusal stabilization splints: a pilot study.

STATEMENT OF PROBLEM: If masticatory load distribution is task-dependent, then the pattern of wear on an acrylic resin occlusal splint over time may affect clinical outcome. PURPOSE: This pilot study quantitatively assessed posterior wear after 3 months on the occlusal surfaces of maxillary stabilization splints. MATERIAL AND METHODS: Subjects with known history of nocturnal bruxism were given heat-cured full-arch acrylic resin occlusal stabilization splints to be worn nocturnally for 3 months. Splint occlusion was adjusted at appliance delivery and was refined at the baseline session 1 to 2 weeks later. No further adjustment of the splint surface was performed during the 3-month study period. Sequential impressions of the splint occlusal surface provided epoxy resin models that were digitized and analyzed through specialized software. Changes in the digitized splint surface from baseline to 3 months allowed comparison of wear facets between splint sides and among tooth locations. RESULTS: Splint wear was asymmetric between sides and uneven between dental locations. CONCLUSIONS: For full coverage occlusal splints, the appliance wear phenomenon can be site specific and, if left undisturbed, may yield two extremes of high wear and a zone of low wear in-between.

Acrylic Resins↗

PubMed1994

Periodontal status of teeth in contact with denture in removable partial denture wearers.

The aims of the study were to determine the periodontal status of the teeth in contact with removable partial dentures (RPDs) and to compare them with other teeth in the opposing arch not related to any prosthesis. The periodontal status was also assessed in relation to the age of the dentures. Four hundred and twenty-seven patients treated with RPDs from 1981 to 1986 were recalled for examination. Prior to prosthetic treatment they were given periodontal treatment and fillings when required. Initially all were given oral hygiene instructions and motivation. They were reviewed regularly only on a short-term basis. Eighteen patients were suitable for the present study comprising of eight males and 10 females whose mean age was 41 years. The RPDs were in use from 1.5 to 8 years (mean 4.6 years). The following parameters were assessed: Plaque index (P1I), Gingival index (GI), loss of attachment (LA) and tooth mobility. The wearing of RPDs resulted in higher P1I, GI and LA compared to the controls and these differences were statistically significant. There was an increased frequency of higher P1I, GI and LA with the increase in denture age. Minor changes in tooth mobility were observed. It was concluded that the wearing of RPDs was detrimental to periodontal health in patients whose oral hygiene was less than adequate.

Adult↗

PubMed1999

Wear of enamel and veneering ceramics after laboratory and chairside finishing procedures.

PURPOSE: This in vitro study compared the wear of enamel against 3 types of ceramics with high esthetic potential (designed for layering techniques): feldspathic porcelain (Creation), aluminous porcelain (Vitadur alpha), and low-fusing glass (Duceram-LFC). Laboratory finishing (glazing/polishing) and chairside polishing with a Dialite kit were simulated to compare their respective effects on wear. METHODS: Tooth-material specimen pairs were placed in an artificial mouth using closed-loop servohydraulics. Constant masticatory parameters (13.5 N occlusal force, 0.62 mm lateral excursion; 0.23 second cuspal contact time) were maintained for 300, 000 cycles at a rate of 4 Hz. The occlusal surface of each pair was mapped and digitally recorded before and after each masticatory test. Quantitative changes were measured in terms of depth and volume of wear. Quantitative wear characteristics were assessed by SEM. RESULTS: Significant differences were observed (2-factor ANOVA, P <.05). Duceram-LFC generated increased volume loss of enamel (0.197 mm(3)) compared with Creation (0.135 mm(3)) and Vitadur alpha (0.153 mm(3)). Creation exhibited the lowest ceramic wear and lowest combined volume loss (0.260 mm(3); the sum of the data for enamel and the opposing material) compared with Duceram-LFC (0.363 mm(3)) and Vitadur alpha (0.333 mm(3)). The most significant differences among materials were observed in volume loss, not in depth of wear. For all 3 ceramic systems, qualitative SEM evaluation revealed an abrasive type of wear. Wear characteristics of chairside polished specimens were similar to those of laboratory finished specimens (glazed and polished). CONCLUSION: Duceram-LFC was the most abrasive ceramic for the antagonistic tooth. Creation ceramic was the least abrasive material and most resistant to wear. Defects, brittleness, and the possibly insufficient toughness of LFC may explain its increased abrasiveness. Laboratory and chairside finishing procedures generated similar results.

Analysis of Variance↗

PubMed1990

A comparison of the Herbst and Fränkel appliances in the treatment of Class II malocclusion.

This study investigated the treatment effects produced by two types of functional appliance, one primarily tooth-borne (the Herbst appliance) and one primarily tissue-borne (the FR-2 of Fränkel). Serial cephalometric radiographs from 45 patients who had been treated with the acrylic splint Herbst appliance and from 41 patients who had been treated with the FR-2 appliance were compared with serial radiographs of 21 untreated persons with Class II malocclusions. Treatment effects were identified through the use of a conventional cephalometric analysis. The results of this study indicated that both appliances had influenced the growth of the craniofacial complex in treated persons. Significant skeletal changes were noted in both treatment groups, with both groups showing an increase in mandibular length and in lower facial height, as compared with controls. Greater dentoalveolar treatment effects were noted in the group wearing the tooth-borne functional appliance than in those wearing the tissue-borne appliance.

Activator Appliances↗

PubMed1994

Lateral and protrusive contact schemes and occlusal wear: a correlational study in a young adult Saudi population.

This study investigated the influence of occlusal contacts on the location and severity of occlusal wear during various mandibular movements. The study population consisted of 80 dental students with a mean age of 22 years, within the age range of 19 to 25 years. A dentition wear index--in addition to anterior, canine, and posterior subindexes--was derived from a tooth-by-tooth evaluation of casts. Lateral excursive and protrusive contact relationships were obtained by clinical examination. There was no correlation between the distribution of occlusal wear and the type of lateral excursive contact scheme. The location of contacts in protrusive movement demonstrated a distinct correlation with occlusal wear in overall severity and distribution according to segmental wear subindexes. The results indicate that the role of "disclusive protection" in the occurrence of occlusal wear may be questioned; the efficacy of "mutual protection" is similarly unsubstantiated, and the results lend further support to the concept of multifactorial etiology of occlusal tooth wear.

Adult↗

PubMedDate not supplied

Fractured-tooth fragment reattachment.

Traumatic injuries with loss of tooth fragments in the incisor region are common, especially among children and adolescents. Reattachment of tooth fragments is an important technique for restoring fractured teeth and provides advantages over resin-composite restoration, including better esthetic appearance, maintenance of tooth form and color, minimal tooth loss, increased wear resistance, and, thus, improved function.

Adolescent↗

PubMed1986

Toothbrush resistance and fluoride retention of sound, etched, fluoridated, and remineralized bovine enamel.

The wear resistance of tooth enamel that had undergone eight different treatments regarding the bonding procedure has been investigated. In comparison to sound enamel, the outer 3 microns of the etched-surface enamel show a decreased wear resistance against toothbrushing in vitro. Remineralization, either direct or preceded by acidified phosphated fluoride (APF) application, did not improve the wear resistance. The prophylactic effect of the APF treatment of etched enamel is considerable and is not lost after the soft, outer surface layer has worn off.

Acid Etching, Dental↗

PubMed1998

In vitro wear of resin denture teeth.

STATEMENT OF PROBLEM: One of the most important physical properties of artificial teeth used in the restoration of the edentulous patient is wear resistance, and the ability of these teeth to maintain a stable occlusal relationship over time. PURPOSE: This study compared the in vitro wear of four different resin denture teeth against human enamel. MATERIAL AND METHODS: Five denture tooth samples opposing five enamel abraders were positioned in a mechanical wear testing device for two 5,000 cycle wear periods (total of 10,000 cycles) under a 13.4 N load. All tests were conducted in human saliva, and the wear was measured at the end of each test period. RESULTS: The wear of the Classic and Kenson acrylic resin denture teeth was much greater than the DB Plus and MLI composite teeth after 10,000 cycles. The wear of the KENSON denture tooth was also greater than the Classic tooth. No wear differences were found between the two composite teeth. CONCLUSIONS: The wear of DB Plus and MLI resin denture teeth was approximately 50% less than the wear of Classic and Kenson teeth when opposed by human enamel.

Acrylic Resins↗

PubMed1992

Food habits and dental disease in an iron-age population.

Tooth diseases and wear record valuable information on diet and methods of food preparation in past human populations. In this paper the teeth of an Iron-Age population (Monte Bibele, Bologna) are analyzed to reconstruct their nutritional situation. The analysis of caries frequency and distribution indicates a level of carbohydrate consumption which is consistent with an agricultural way of life. The presence of calculus indicates that proteins were present in the diet of the Monte Bibele population. The frequency of antemortem tooth loss and of dental abscesses is in harmony with the results of the analysis of caries and calculus. The examination of dental wear suggests the presence of a substantial vegetable component in the diet. From the analysis of the dental characteristics one can conclude that the population of Monte Bibele had a prevalent agricultural economy. The presence of some diachronic variations in the distribution of the examined characters suggest changes in the diet in the course of time.

Feeding Behavior↗

PubMed1976

The maintenance system and occlusal dynamics.

We have discussed the maintenance system and its relationship to occlusal dynamics and occlusion function. The premise has been set forth that to avoid untoward sequelae post-orthodontically in the areas of relapse of tooth positions, occlusal wear, periodontal disease, and temporomandibular pain-dysfunction, it is best to have an occlusion free from centric and excursive interferences. The practical approach to the desired goal for the orthodontist lies in an understanding and familiarity of occlusal dynamics that allows him to look at detailing of tooth positions with insight into their ramifications from a functional standpoint. The insight can only be gained by hard work and self-discipline in the study of occlusion. A knowledge of these concepts will alert the orthodontist ot the true severity of the cases he is treating, allow him to position teeth so as not to create problems and , lastly, to be able to competently handle those cases that do develop posttreatment problems.

Bruxism↗

PubMed2004

[Preliminary study of tooth measured by a noncontact 3D image survey system].

OBJECTIVE: To perform the quantitative study of tooth occlusal surface wear by a noncontact 3D image survey system. METHODS: Thirty-two old people's complete dental casts in five years which had normal occlusion were studied. The same way was used to determine the individual reference surface, and the range of the maxillary first molar occlusal surface was delimited by the unite regulation. Then the quantity of wear in five years and wear rate of maxillary first molar occlusal surface were measured by the noncontact 3D image survey system. RESULTS: Wear of maxillary first molar occlusal surfaces was as follows: the mean height loss was 0.293 mm in five years and the mean wear rate was 0.059 mm/year; the mean volume loss was 97.881 mm(3) in five years and the mean wear rate was 19.576 mm(3)/year. CONCLUSIONS: Under the necessary conditions, the noncontact 3D image survey system is an effective method to measure the wear of dental occlusal surface, but some set-up conditions need to be improved further.

Adult↗

PubMed2004

[An investigation on dental bio-tribological characteristics of prosthesis made of titanium material].

OBJECTIVE: This study aimed at investigating bio-tribological property of titanium opposite to teeth as a base of clinical application. METHODS: Under a modified fretting machine, wear tests on human natural teeth were carried out in artificial saliva conditions against to pure titanium. The dynamic frictional process and wear mechanisms were investigated by means of Nene-2, MVK-H12, TALYSURF6, OM, LSM, SEM, EDX. RESULTS: The coefficient of friction exhibited a variation pattern of longs. The wear mechanism of natural tooth was detected as micro-cut and denaturation of dental texture and the wear depth of Ti/teeth was 20.33 + 2.86 microm, the wear depth of Ti/Ti being 38.00 + 5.88 microm (P < 0.05). CONCLUSIONS: The natural tooth has a good tribological behavior, matching the friction behavior of pure titanium. Over occlusal force during masticate process and para-function should be avoided. When we chose dental materials, wear resistance should be taken into account.

Dental Materials↗

PubMed1998

Mortality analysis of Pleistocene bears and its paleoanthropological relevance.

Bear bones and Paleolithic stone artefacts often co-occur in Pleistocene cave deposits of Eurasia, raising the question of how these associations come about and the need for effective methods with which to obtain a clear answer. Building upon knowledge of modern bears, I present a method for testing two competing hypotheses about the causes of bear mortality in hibernation contexts. The first hypothesis proposes that age-dependent deaths resulted from non-violent causes (principally starvation), implying that bears' presence in a cave was not linked in time to human activities there. The second hypothesis proposes that random bear deaths in caves resulted from hunting by humans or other large predators, implying a temporal link between them; the expectation of a nonselective age pattern in this circumstance arises from the fact that the individual characters of hibernating bears are hidden from predators. Three elements of the method and its development are presented: (1) a brief review of the biological bases of hibernation-related mortality in modern Ursus, its paleontological consequences, and test expectations drawn therefrom; (2) a detailed, illustrated technique for age-scoring isolated bear cheek teeth based on tooth eruption-wear sequences, developed primarily for cave and brown bears; and, (3) a simple, accurate way to evaluate real cases in terms of contrasting mortality models. The final step is demonstrated by application to a Middle Pleistocene cave bear assemblage (Ursus deningeri) from Yarimburgaz Cave in Turkey, a large collection found in general stratigraphic association with Paleolithic artefacts. The advantages of the method include its ability to (a) handle small samples, (b) use isolated tooth specimens, and (c) evaluate cases simultaneously in terms of idealized age structure models and the variation that normally is associated with each under natural conditions. While the more obvious benefit of bear mortality analysis may be to research on ancient bear demography, the principles and procedures offered here are equally pertinent to archaeological studies of carnivore-mediated formation processes in cave sites. As is generally true in taphonomic research, however, bear mortality patterns are most effective when used in combination with independent lines of evidence to address questions about assemblage formation.

Animals↗

PubMed2004

Reattachment of fractured fragments of maxillary central incisors--report of a case.

Reattachment of the original tooth fragment to the fractured tooth helps in maintaining the tooth's colour, wear resistance, morphology and translucency in the restoration. This paper describes the reattachment of fractured fragments using metallic post and core in case of a 12 year old patients who suffered a complicated facture of maxillary central incisors.

Cementation↗

PubMed1983

The effects of enamel wear on the metal-porcelain interface.

This study evaluated the effects of wear of human tooth enamel on the metal-porcelain interface. Failure in the porcelain half of the specimens occurred only in specimens where the metal angle was 60 degrees. There was failure in one of four of the noble metal alloy specimens. With the base metal alloy specimens, in the first group two specimens showed cracks in the preparation stage while the other two showed no sign of cracks either before or after testing. In a second group of four base metal alloy specimens with a 60-degree angle, all four specimens showed cracks in the porcelain after glazing. These specimens were repaired by grinding out the cracks and filling them with porcelain. After wear-testing, all four specimens developed cracks. The data indicate that the acute angle of metal (60 degrees) at the metal-porcelain interface was more conducive to crack formation than were the other two angles tested. Therefore, in the case of a metal-ceramic restoration, with the occlusion on the metal, an acute angle of metal would not be appropriate. Furthermore, under clinical circumstances cracks that occur after glazing, as arose with the last four base metal alloy specimens (60 degrees), probably should not be ground out and refilled with porcelain. The results of this study indicate that such a practice in a clinical situation could lead to eventual fracture of the porcelain. The porcelain half of the specimens had a deeper and wider wear track than its metal counterpart, which indicated that the porcelain is less resistant than the metal to wear by enamel.(ABSTRACT TRUNCATED AT 250 WORDS)

Dental Alloys↗

PubMed1997

The esthetics of anterior tooth aging.

As generations proceed to reinvent themselves in an effort to achieve and maintain youth, cosmetic dentistry faces one of its greatest and most persistent challenges: the restoration of an aging smile. Although the need for this restorative therapy has not yet been adequately studied, the momentum continues to build as aging teeth exhibit physical characteristics that affect their function as well as appearance. This review presents the most common factors influencing the esthetics of anterior tooth aging: coloration; wear and the effects of erosion, attrition, abrasion, and abfraction; and position of teeth relative to each other and surrounding tissues. While dental science seeks to understand how well age-specific restorative procedures can affect patients, the question of the necessity of this therapy remains. Should a healthy smile require treatment? Only time will reveal at what cost and to what extent a younger appearance plays a role in dental science.

Adult↗

PubMedDate not supplied

The efficacy of reservoirs in bleaching trays.

Thirty patients were selected to bleach their maxillary teeth. Vacuum-formed trays were fabricated for the maxillary arch so that only one quadrant of bleaching tray had reservoirs. Nupro Gold 10% carbamide peroxide gel was given to patients. They were instructed to place a drop of gel in each tooth area and wear the trays twice a day for two-hour periods. After 10 days the patients were evaluated for shade changes in each quadrant. No clinical difference was observed in the after-shade match of the two quadrants. It appears that the addition of blockout spacers to create reservoirs does not increase the success of home bleaching.

Administration, Topical↗

PubMed2004

Genetics and the evolution of primate enamel thickness: a baboon model.

The thickness of mammalian tooth enamel plays a prominent role in paleontology because it correlates with diet, and thicker enamel protects against tooth breakage and wear. Hominid evolutionary studies have stressed the importance of this character for over 30 years, from the identification of "Ramapithecus" as an early Miocene hominid, to the recent discovery that the earliest hominids display molar enamel intermediate in thickness between extant chimpanzees and Australopithecus. Enamel thickness remains largely unexplored for nonhominoid primate fossils, though there is significant variation across modern species. Despite the importance of enamel thickness variation to primate evolution, the mechanisms underlying variation in this trait have not yet been elucidated. We report here on the first quantitative genetic analysis of primate enamel thickness, an analysis based on 506 pedigreed baboons from a captive breeding colony. Computed tomography analysis of 44 Papio mandibular molars shows a zone of sufficiently uniform enamel thickness on the lateral surface of the protoconid. With this knowledge, we developed a caliper metric measurement protocol for use on baboon molars worn to within this zone, enabling the collection of a data set large enough for genetic analyses. Quantitative genetic analyses show that a significant portion of the phenotypic variance in enamel thickness is due to the additive effects of genes and is independent of sex and tooth size. Our models predict that enamel thickness could rapidly track dietary adaptive shifts through geological time, thus increasing the potential for homoplasy in this character. These results have implications for analyses of hominoid enamel thickness variation, and provide a foundation from which to explore the evolution of this phenotype in the papionin fossil record.

Animals↗