Biomedical subjects

Bruce Matis

Publications and source records attributed to Bruce Matis.

2 recordsLinked to original sources

PubMed2005

The dental pulp: inflammatory markers and vital bleaching.

PURPOSE: To evaluate the expression of specific neuropeptides associated with inflammation, substance-P (SP) and calcitonin gene-related peptide (CGRP), after night guard vital bleaching with 10% carbamide peroxide gel. METHODS: 10 patients with four caries free premolars scheduled for orthodontic extraction had these teeth bleached with 10% Opalescence as follows: tooth #28, no treatment (control); #5, 4 days of bleaching; #12, 2 weeks of bleaching; #21, 2 weeks of bleaching, followed by 2 weeks without treatment. All teeth in the four groups were extracted at the same time. Immediately after extraction the teeth were frozen at -197 degrees C in liquid nitrogen. The pulp samples were prepared for enzyme-linked immunoabsorbent assay (ELISA) to determine the concentrations of the SP, CGRP and total protein in the pulp tissue. RESULTS: The analysis of mean SP and mean CGRP/ng protein/ml resulted in no significant differences among the four groups. It was concluded that the study did not demonstrate an increase in the release of SP and/or CGRP during night guard vital bleaching of teeth with 10% Opalescence.

Adolescent↗

PubMed2004

Designing visually optimal shade guides.

STATEMENT OF PROBLEM: Dental shade guides do not provide a broad coverage of tooth colors. There is a need for shade guides that can provide closer color matches. PURPOSE: The purpose of this study was to propose and assess a visually optimal shade guide for tooth color matching. MATERIAL AND METHODS: With the use of a spectrophotometric approach, the color distribution (L*a*b*) of 150 extracted human teeth and 3 commercially available shade guides (Vita Lumin V, Trubyte Bioform Color Order Shade Guide, and Vitapan 3D-Master Shade System) was measured. With the use of a hierarchical clustering approach, a series of shade guides was designed with a varying number of tabs. The average error (DeltaE) between colors from each shade guide and the extracted teeth was computed. RESULTS: The proposed visually optimal shade guide had the smallest average error of all guides tested. The new guide achieved lower error with fewer shade tabs than the 3 commercial systems evaluated. CONCLUSION: Within the limitations of this study, it was demonstrated that a hierarchical clustering technique can be used to design a visually optimal shade guide for a given population with a flexible degree of control over the mean error and number of tabs.

Color↗