Type and incidence of cracks in posterior teeth

Ratcliff, Steve; Becker, Irwin M.; Quinn, Linda

doi:10.1067/mpr.2001.116578

Cited by 98 publications

(70 citation statements)

References 12 publications

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“…The presence of a working-side interference will affect the lateral mandibular guidance and again planning of the new occlusal scheme before treatment is essential. Ratcliffe et al 14 found statistical association between the presence of lateral excursive interferences and cusp fracture. To confirm these findings further research needs to be carried out into the association between non-working side interferences (NWSI) and cracked cusp syndrome (Figs 11 and 12).…”

Section: Occlusal Interferencesmentioning

confidence: 99%

A study of the incidence of overeruption and occlusal interferences in unopposed posterior teeth

Craddock

Youngson

2004

Br Dent J

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Objectives To determine the incidence and extent of overeruption in unopposed posterior teeth; to determine the incidence of occlusal interferences associated with unopposed posterior teeth; and to detect an association between the extent of overeruption and the presence of occlusal interference. Design The study was a single centre clinical retrospective analysis. Setting The setting was in the Combined Care Clinic of Leeds Dental Institute. The patients were undergoing routine restorative care by final year undergraduate dental students during 2000. Subjects and methods All patients over18 years of age with one or more unopposed posterior tooth, were invited to participate. A sample group of 120 subjects were recruited. A clinical occlusal examination was carried out and the presence of initial retruded contact position (RCP) contacts and excursive interferences were recorded. Study models were made and digitally scanned. Outcome measures Measurements of overeruption from the curve of Spee were made from the images obtained, by a single observer. Reliability of the measurements was assessed by means of a Bland Altman Plot. The presence and site of RCP contacts and excursive interferences were recorded by a single observer. Reliability of the measurements was assessed by means of Kappa scores. The association between overeruption and the presence of occlusal interference was examined using Spearmans Correlation Coefficient. Results A total of 120 subjects were recruited, with a total of 155 unopposed sites. Eighty-one of the sites belonged to male subjects, 74 to female subjects. The mean age of the group was 50.9 years, Standard deviation 13.9. Eighty-three per cent of sites displayed overeruption (95% CI 78-90), ranging from under 0.5 mm to 5.4 mm. The reliability of the observations was found to be good. A total of 51.6% (95% CI 44-60) of unopposed teeth were involved in RCP contacts or excursive interferences. Thirty-two sites were involved in more than one contact or interference. The intra-examiner agreement was found to be good, using Kappa. The findings of the Spearman's correlation, show that if an association exists between overeruption and occlusal interference, it is weak, and of no statistical significance. Conclusions Eighty-three per cent of unopposed teeth are likely to overerupt, and the extent of the overeruption may be marked. The incidence and extent of overeruption is of clinical significance, not only in terms of treatment planning to prevent undesirable vertical movement, but also in the restoration of the edentulous space. The reliability of observations made in the study was found to be good, justifying the methodology. Fifty-one point six per cent of unopposed teeth are likely to be involved in RCP contacts or excursive interferences. The incidence is of clinical significance when planning the restoration of unopposed teeth, or the associated edentulous space. Only a weak statistical association was demonstrated between the degree of overeruption and the presence of occlusal interferen...

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Section: Occlusal Interferencesmentioning

confidence: 99%

A study of the incidence of overeruption and occlusal interferences in unopposed posterior teeth

Craddock

Youngson

2004

Br Dent J

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“…Occlusal forces have been implicated in craze and crack formation in humans and marmosets (Ratcliff et al, 2001, Hershkovitz, 1970. (Ratcliff et al, 2001, Hershkovitz, 1970. Cracked and chipped teeth were isolated to the free-range population, possibly indicating that the captive population mastication places less stress on the tooth structure.…”

Section: 5mentioning

confidence: 99%

“…In the captive environment, the choice of softer cleansed leaves may be reducing the frequency of crazing and cracking as well as reducing the occlusal wear (Cuozzo et al, 2010). Occlusal forces have been implicated in craze and crack formation in humans and marmosets (Ratcliff et al, 2001, Hershkovitz, 1970. (Ratcliff et al, 2001, Hershkovitz, 1970.…”

Section: 5mentioning

confidence: 99%

Oral health in South East Queensland Koalas: Prevalence of periodontal disease and other pathologies

Pettett¹

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The koala (Phascolarctos cinereus) is one of Australia's most highly specialised folivores with a diet exclusively of eucalyptus leaves to provide all nutritive needs. For this it is dependent on good dentition for optimal health and quality of life. The purpose of this study was to characterise and describe the level of oral health and disease in koalas and then create tools for ongoing analysis.The historical records over a 17-year period were noted for the koalas admitted to the Moggill Koala Hospital in South East Queensland. Further, in this study the conclusions were that oral health issues when they existed were only being identified as "low key" due to the lack of investigative tools being used during examinations. This provided the reasoning and impetus behind developing tools to determine the true extent of oral health conditions in the koala. A suitable assessment tool for diagnosing the oral health was designed based on the index scoring methodology and the layout of the Moggill Koala Hospital admission chart, a new oral health chart template was developed. The chart was based on examination of 30 "free-range koalas" and validation and quality assurance analysis of four examiners of varying qualifications. The chart was separated into three sections; containing general animal information such as sex, age, and current systemic health; the General Oral Cavity section and containing information on 12 koala-specific health questions and finally a section on the periodontal health. The charting data is multifunctional with analysis of individual koalas, (sex, group or age). The data from each section provided an index value that was compatible with values from other species clinical charting systems.Using the chart, populations of 200 "free-range" and 95 captive koalas (from three zoos) were examined. Three major indexes were developed during the chart development process and used the following equation; General Oral Cavity (GOCI) + Oral Health Index (OHI) = Final Oral Health Index (FOHI). Initially, the three major index values plus all additional information of each chart were analysed to show the current baseline values of oral health conditions in the koala. Any ii comparison based on singular or multiple animals would either show a decline, same rate or increase from the baseline. These baseline parameters could be compared against any other species that uses the same 0-3 index system.The proportion of koalas from the whole population with an orally related problem was 86%.The average FOHI for the koala as a species was 3.78 ± 3.19, median 3.00. This is the mild category and held 84.5% of all cases. The maximum scores for the groups showed Zoo 3 as having lower range (Zoo 1; 11.42 for a TWC 1 male, Zoo 2; 13.40, Zoo 3; 4.13 and "free-range"; 15.98). The third zoo was the only group to have also had significantly better oral health than "free-range" koalas.Captive koalas showed high scoring at young age (11.42), the "free-range" comparable age score was 3.84. At population level when controlli...

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“…23 It has been proposed that a cavity of width in excess of one quarter of the intercuspal distance should be considered to be at an increased risk of fracture. 24 Ratcliff et al 25 have estimated that the presence of an intra-coronal restoration can predispose the tooth to a risk of fracture 29 fold times greater than that of a healthy, un-restored tooth! Differences in the co-efficients of thermal expansion between that of the tooth tissue and restorative material may also have the potential to induce fracture.…”

Section: The Diagnosis Of Cracked Tooth Syndromementioning

confidence: 99%