Journal ArticleDOI
Effect of in vivo crown margin discrepancies on periodontal health
TLDR
It is established that a significant quantitative relationship existed between the marginal discrepancy and periodontal tissue inflammation for subgingivally located crown margins.Abstract:
Numerous reports have suggested a relationship between marginal adaptation of dental castings and periodontal tissue health, and this study examined this relationship quantitatively. Forty-two crown restorations in 29 randomly selected patients were selected for this study using three criteria. (1) The crowns were placed at the University of North Carolina School of Dentistry; (2) the crowns were in service for a minimum of 4 years; and (3) the crown margins were within the intracrevicular crevice (subgingival). Replica impressions of the facial margins of specific crowns were made with a vinyl polysiloxane impression material, and poured casts were prepared for scanning electron micrograph evaluation. Marginal discrepancy measurements were identified on each micrograph at 10 equally spaced locations along the margin and averaged for each specimen. Periodontal indices of pocket depths, crevicular fluid volume, and gingival index were accumulated for clinical measurements. Pearson correlation and Bonferroni adjusted probability tests were performed, but no significant correlation was found between marginal discrepancy (0.16 +/- 0.13 mm) and pocket depth (2.4 +/- 0.9 mm). However, a strong correlation (p less than 0.001) existed between marginal discrepancy and gingival index (2 +/- 0.8) and between marginal discrepancies and crevicular fluid volume (49.9 +/- 31.1). These results established that a significant quantitative relationship existed between the marginal discrepancy and periodontal tissue inflammation for subgingivally located crown margins.read more
Citations
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Journal ArticleDOI
Clinical fit of all-ceramic three-unit fixed partial dentures, generated with three different CAD/CAM systems
TL;DR: The results suggest that the accuracy of CAD/CAM generated all-ceramic three-unit fixed partial dentures (FPDs) is satisfactory for clinical use.
Journal Article
A comparison of the marginal fit of In-Ceram, IPS Empress, and Procera crowns.
TL;DR: There were no significant differences among the various stages of the crown fabrication: core fabrication, porcelain veneering, and glazing, but the facial and lingual margins exhibited significantly larger marginal discrepancies than the mesial and distal margins.
Journal ArticleDOI
Marginal adaptation of ceramic crowns: A systematic review
TL;DR: Four parameters were found to influence marginal adaptation: finish line configuration, value of the predefined cementing space, veneering process, and cementation, which generally provide a clinically acceptable marginal fit.
Journal ArticleDOI
Determination of the minimum number of marginal gap measurements required for practical in-vitro testing.
TL;DR: Fifty measurements are required for clinically relevant information about gap size regardless of whether the measurement sites are selected in a systematic or random manner, which is far more than what current in vitro studies use.
Journal ArticleDOI
Accuracy and Reliability of Methods to Measure Marginal Adaptation of Crowns and FDPs: A Literature Review
Noor Nawafleh,Noor Nawafleh,Florian Mack,Jane Evans,John Duncan Mackay,Muhanad M. Hatamleh,Muhanad M. Hatamleh +6 more
TL;DR: There was a substantial lack of consensus relating to marginal adaptation of various crown systems due to differences in testing methods and experimental protocols employed, and direct view technique was the most commonly used method of reproduced results.
References
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Journal ArticleDOI
Periodontal Disease in Pregnancy II. Correlation Between Oral Hygiene and Periodontal Condition
John Silness,Harald Löe +1 more
TL;DR: In this paper, the correlation between oral hygiene and periodontal condition was investigated in the context of pregnant women with Periodontal Disease in Pregnancy II (PDI II).
Journal ArticleDOI
Bacterial leakage around dental restorations: its effect on the dental pulp
TL;DR: This study revealed that the quantity of bacteria filtered from the base of Class V cavity restorations were directly related to the type of medicament used, while zinc oxide and eugenol cement showed none.
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Clinical and microbiological effects of subgingival restorations with overhanging or clinically perfect margins
TL;DR: Changes in the subgingival microflora after the placement of restorations with overhanging margins document a potential mechanism for the initiation of periodontal disease associated with iatrogenic factors.
Journal ArticleDOI
Periodontal conditions in patients 5 years following insertion of fixed prostheses. Pocket depth and loss of attachment
Jakob Valderhaug,J M Birkeland +1 more
TL;DR: When the crown margins were located sub-gingivally there was an increase in Gingival Index scores 2 and 3, in pocket depth, and in loss of attachment compared to a supragingival placement, however, most of the alterations were small.