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At least 127 records · Page 7Linked to original sources
PubMed2004

Risk indicators for posterior tooth fracture.

BACKGROUND: Identifying posterior teeth that are at heightened risk of developing cusp fracture is an inexact science. Risk indicators based on controlled observations are not available, and dentists' assessments vary. METHODS: The authors conducted a case-control study of cusp fracture in restored posterior teeth. They evaluated 39 potential risk indicators identified in previous uncontrolled studies for an association with fracture in 200 patients with fractures and 252 patients without fractures. These risk indicators delineated patients' clinical characteristics and behaviors, as well as clinical characteristics of individual teeth. The authors used logistic regression to develop models identifying risk indicators associated with fracture, both between case and control subjects and between case and comparison teeth in case subjects. RESULTS: Two risk indicators appeared in both models. The presence of a fracture line and an increase in the proportion of the volume of the natural tooth crown occupied by the restoration substantially increased the odds of fracture (P < .001). Additional risk indicators were unique to the case subject-control subject model, including subject age and other measures related to the relative size of the restoration or to loss of dentinal support. Neither patient behaviors such as clenching, grinding and biting hard objects nor occlusal characteristics such as guidance, cusp anatomy and general wear patterns were strong predictors of fracture risk. CONCLUSIONS: Among posterior teeth with restorations, two clinical features were strongly associated with the risk of cusp fracture: presence of a fracture line in the enamel and proportional volume of the restoration. CLINICAL IMPLICATIONS: Dentists assessing the risk of fracture should consider a detectable fracture line or a high ratio of restoration-to-total-crown volume as important indicators of elevated risk.

Age Factors↗
PubMed1983

Acute care of severe tooth fractures.

Teeth that are severely fractured and demonstrate vital tissue at the fracture line may be treated acutely by extirpating the pulp. This technique leaves the patient free of pain until secondary care is available.

Anesthesia, Dental↗
PubMed1981

Hairline tooth fracture: a clinical case report.

References to the hairline fracture and the difficulty of diagnosis abound in the literature. A case is presented that illustrates the importance of early detection and treatment of the syndrome.

Bicuspid↗
PubMedDate not supplied

[Clinico-morphologic basis for the orthodontic treatment of intra-alveolar tooth fractures in children and adolescents].

Analyzed were the results of treatment of 115 teeth with intraalveolar root fractures in 78 patients aged 8 to 18 years. Histological investigation was performed in 8 teeth extracted for clinical indications. Combined with the results of experiments conducted on 12 dogs, this allowed to establish that several variants of cicatrization were possible. An addition was offered to the classification of intraalveolar fractures. Orthopedic technique was designed on the basis of the pathogenesis of the lesion.

Adolescent↗
PubMed2003

A simple method to estimate restoration volume as a possible predictor for tooth fracture.

STATEMENT OF PROBLEM: Many dentists cite the fracture risk posed by a large existing restoration as a primary reason for their decision to place a full-coverage restoration. However, there is poor agreement among dentists as to when restoration placement is necessary because of the inability to make objective measurements of restoration size. PURPOSE: The purpose of this study was to compare a new method to estimate restoration volumes in posterior teeth with analytically determined volumes. MATERIAL AND METHODS: True restoration volume proportion (RVP) was determined for 96 melamine typodont teeth: 24 each of maxillary second premolar, mandibular second premolar, maxillary first molar, and mandibular first molar. Each group of 24 was subdivided into 3 groups to receive an O, MO, or MOD amalgam preparation design. Each preparation design was further subdivided into 4 groups of increasingly larger size. The density of amalgam used was calculated according to ANSI/ADA Specification 1. The teeth were weighed before and after restoration with amalgam. Restoration weight was calculated, and the density of amalgam was used to calculate restoration volume. A liquid pycnometer was used to calculate coronal volume after sectioning the anatomic crown from the root horizontally at the cementoenamel junction. True RVP was calculated by dividing restoration volume by coronal volume. An occlusal photograph and a bitewing radiograph were made of each restored tooth to provide 2 perpendicular views. Each image was digitized, and software was used to measure the percentage of the anatomic crown restored with amalgam. Estimated RVP was calculated by multiplying the percentage of the anatomic crown restored from the 2 views together. Pearson correlation coefficients were used to compare estimated RVP with true RVP. RESULTS: The Pearson correlation coefficient of true RVP with estimated RVP was 0.97 overall (P</=.0001). Coefficients for comparisons stratified by tooth type, restoration type, and restoration size groups were all greater than 0.90 (P</=.0001). CONCLUSION: Within the limitations of this study, the high correlation between estimated RVP and true RVP indicated that estimated RVP was an accurate method to quantify the relative volume of restorative material in coronal tooth structure. The fact that it can be done in a nondestructive manner makes it attractive for clinical situations.

Bicuspid↗