One challenge faced by dental professionals is that, unlike natural tooth structure, composite restorations do not lighten when exposed to bleaching agents. As a result, functional restorations may need replacement after bleaching to match the newly whitened teeth. However, replacing a composite restoration can lead to unnecessary removal of tooth structure, potentially weakening the tooth and increasing its susceptibility to further iatrogenic damage. This study will investigate the ability of Omnichroma restorations to shade-match tooth structure after bleaching. The null hypotheses will be: 1. Single-shade RBC will not exhibit similar shade and optical behavior to conventional RBC across all anterior restorations following bleaching. 2. Patient satisfaction regarding color blending between the restoration and tooth structure will not differ according to the type of material used. 3. Dentist satisfaction regarding color blending between the restoration and tooth structure will not differ according to the type of material used.
Selecting the proper shade for a restoration is of vital importance for achieving optimal aesthetic results. However, shade selection can be time-consuming, somewhat subjective, and heavily reliant on the clinician's visual judgement. This study will explore the ability of Omnichroma restorations to shade match tooth structure after bleaching. Patients visiting the JUST dental clinics who have at least two anterior restorations (one Omnichroma restoration and one multi-shade nanohybrid composite restoration) will be recruited for this study. The calculated sample size for the study is 240 teeth. The shade and the L\*a\*b\* scores will be recorded using spectrophotometer prior to bleaching and after bleaching. Two blinded, calibrated dentists will independently evaluate the resulting shade outcomes and assess the degree of color match between the restorations and the adjacent teeth after bleaching. This assessment will be categorized as either match or no match. The patient's satisfaction will also be recorded two weeks after bleaching.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
120
Teeth restored with conventional multi shade nanohybrid Resin Based Composite (RBC) Filtek Z350Xt (3M ESPE, San Paul, MN, USA) subjected to bleaching using Opalescence Boost 40% In-Office Tooth Whitening System (Ultradent, Utah, USA)
Teeth restored with One-shade Resin Based Composite (Omnichroma, Tokuyama Dental, Tokio, Japan) subjected to bleaching using Opalescence Boost 40% In-Office Tooth Whitening System (Ultradent, Utah, USA)
Jordan University of Science and Technology
Irbid, Jordan
RECRUITINGColor measurements using digital spectrophotometer VITA Easyshade V.
The colour measurements will be taken at first session for each tooth in specific points as follow: One reading from middle part of tooth Three readings at three points around the restoration and 1 mm away from its margins. To give a chance for tooth rehydration and final color optimization, a new reading will be obtained from the middle portion of the restoration after one week. The color difference (∆E00) between the tooth structure around the restoration and the restoration itself will be calculated. The color difference (∆E00) between the tooth and restoration will be compared between the control and test groups. The final ΔE00 value itself has no physical unit. It is just a numerical representation of color difference.
Time frame: One year
Subjective or Patient satisfaction
Patient satisfaction regarding color blending between the restoration and tooth surface will be recorded after one week using visual analogue scale (VAS). The scale is a horizontal line with 10 digits, where 0 (on the right) represents total dissatisfaction with color blending between the tooth and restoration, and 10 (on the left) indicates complete satisfaction. Patients will mark their satisfaction with the color matching and blending of the restoration on the VAS. Measurements will be categorized as follows: Poor: VAS values from 0 to 5 Good: VAS values from 5.1 to 10
Time frame: One year
Objective or dentists satisfaction
Photographs of the restored teeth will be taken under a standardized setup using a Canon 250D DSLR camera, a Sigma 105 mm macro lens, and a Meike MK-14EXT TTL macro ring flash. The images will be evaluated by two calibrated dentists who are blinded to the restoration material. Blending with the tooth surface will be assessed using VAS, with the assessors marking their evaluation on the scale. Measurements will be divided according following criteria: Poor: VAS values ranging from 0-5. Good :VAS values ranging from 5.1-10.
Time frame: One year
This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.