Influence of tooth preparation taper and cement type on recementation strength of complete metal crowns.

J Prosthet Dent

Section of Restorative Dentistry, Prosthodontics, and Endodontics, College of Dentistry, University of Tanta, Tanta, Egypt.

Published: December 2009

AI Article Synopsis

  • Lack of retention in fixed dental prostheses is a key factor in their failure, prompting this study to investigate the impact of convergence angles on recementation strength.
  • The study utilized 120 artificial crowns with varying taper angles (5, 12, 25 degrees) and different luting cements to measure the tensile force needed to dislodge them from tooth preparations.
  • Results showed that taper angle and cement type significantly influenced initial retention, with Panavia 21 cement demonstrating the highest retention, although the success of recementation did not differ significantly from initial cementation.

Article Abstract

Statement Of Problem: Clinical studies have shown that lack of retention is one of the major causes of fixed dental prosthesis failure.

Purpose: The purpose of this study was to determine the relationship between the convergence angle of a complete metal crown tooth preparation and the recementation strength for restorations cemented with conventional and adhesive cements.

Material And Methods: One hundred twenty artificial crowns were cast for standardized complete metal crown tooth preparations accomplished with the use of a milling machine on extracted human teeth. Three different tapers, 5, 12, and 25 degrees, were used (n=40). The crowns in each group were subdivided into 4 subgroups (n=10) according to the luting cement: zinc phosphate cement (Fleck's), glass ionomer cement (Ketac-Cem), and adhesive resin cements (Panavia 21 and C&B-Metabond). Retention was evaluated by measuring the tensile force required to dislodge the crowns from the tooth preparations in a universal testing machine. Subsequently, the tooth preparations were scraped clean and polished with prophylaxis paste, and the intaglio surfaces of the artificial crowns were ultrasonically cleaned and airborne-particle abraded with 50-mum aluminum oxide powder prior to recementation. The data were analyzed with 3-way repeated-measures ANOVA and Tukey's HSD test (alpha=.05).

Results: Analysis of measurements disclosed a significant difference for taper and luting cement (P<.001); however, their interaction was not significant. Also, there was a statistically significant difference between the retention of the first cementation and the second cementation (P<.001). However, the interaction was not significant with taper or cement. Regardless of the taper used, Panavia 21 cement exhibited the highest mean initial retention, but the difference was not significantly different from the recementation retentive strength.

Conclusions: Tooth preparation taper and type of luting cement had a direct effect on the recementation strength of complete metal crowns.

Download full-text PDF

Source
http://dx.doi.org/10.1016/S0022-3913(09)60192-XDOI Listing

Publication Analysis

Top Keywords

complete metal
12
tooth preparations
12
tooth preparation
8
recementation strength
8
metal crown
8
crown tooth
8
artificial crowns
8
luting cement
8
cement
5
crowns
5

Similar Publications

Sodium chloride, commonly referred to as table salt, is the most widely utilized seasoning in culinary applications. Nevertheless, the most of oral salts used contain impurities. Arsenic (As), mercury (Hg), cadmium (Cd), and lead (Pb) are the most common impurities found in salt.

View Article and Find Full Text PDF

During the harvest of Ilex paraguariensis, approximately 2-5 tons per hectare of thick stems are left on the soil surface. The outer portion of these stems, referred to as the coproduct, constitutes 30% of the total residue mass. Although this coproduct has been partially characterized in terms of its phytochemical profile, its technological applications remain unexplored.

View Article and Find Full Text PDF

ConspectusThe discovery of reversible hydrogenation using metal-free phosphoborate species in 2006 marked the official advent of frustrated Lewis pair (FLP) chemistry. This breakthrough revolutionized homogeneous catalysis approaches and paved the way for innovative catalytic strategies. The unique reactivity of FLPs is attributed to the Lewis base (LB) and Lewis acid (LA) sites either in spatial separation or in equilibrium, which actively react with molecules.

View Article and Find Full Text PDF

Antibiotic residues have become serious health concerns due to the development of antibiotic-resistant bacteria. The treatment of antibiotic pollutants in wastewater is necessary for reducing the issue of antibiotic resistance. In this work, the metal oxide photocatalyst titanium dioxide (TiO) was evaluated for the removal of the tetracycline antibiotic (TC-A) and the deactivation of bacteria (E-B) from wastewater.

View Article and Find Full Text PDF

Questionnaire survey on the clinical application of Hall technique preformed metal crowns in caries of primary molars in China.

Front Oral Health

January 2025

State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Clinical Research Center for Oral Diseases, Department of Pediatric Dentistry, School of Stomatology, The Fourth Military Medical University, Xi'an, China.

Objective: To analyze the clinical application and limiting factors of the Hall technique (HT) preformed metal crowns in caries of primary molars and to provide reference for its clinical application based on a questionnaire survey.

Materials And Methods: From June to December 2022, a questionnaire was distributed to pediatric dentists through the WeChat platform using "Questionnaire Star" to analyze the clinical application and influencing factors of the HT preformed metal crowns in caries of primary molars.

Results: A total of 700 survey questionnaires were distributed, and 650 valid questionnaires were recovered, with a effectiveness rate of 92.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!