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The aim of the study is to assess the marginal fit following preparation finishing with ultrasonic tips of porcelain veneers compared to the ordinary preparation using burs only. Two-hundred and forty crowns prepared to receive porcelain veneers (in a split-mouth design). On one side of the mouth, the prepared surfaces will be finished with ultrasonic tips. Marginal fit is measured by a 'cement replica technique'.
All-ceramic restoration are increasing in daily routine treatments although remain less popular than metal-ceramic crowns especially as the cost of metal rises and aesthetic requested people increases The increased demand for aesthetic treatments has led to the widespread use of metal-free ceramics for conservative restorations. Whilst studies for clinical porcelain restorations clarifies satisfactory success rates describes the reasons for failure is due to advance the techniques and materials used in dental restorations. All-ceramic restorations failures are due to several reasons, such as restoration fractures, discoloration in marginal area, marginal misfits and secondary decays. However, secondary caries is the main failure mentioned by the studies, responsible for 21% of the suddenly crown replacements. The etiology of secondary caries is as classified to primary caries, with the involvement of the same cariogenic microorganisms. The place and spread where to invade of primary and secondary lesions are also similar, with secondary caries developing mainly in the gingival tooth interface of restored teeth. Different authors have mentioned different instrumentation to prepare teeth appropriately.Preparation may be applied using diamond burs attached to sonic devices or high-speed rotating instruments with diamond or tungsten carbide burs. The action of conventional high-speed instruments applied for tooth preparation has been widely researched as well as the adhesion strengths and marginal microleakage it produces. Some authors insisted that dental surface morphology of prepared teeth is influenced by the type of bur used for preparation.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Ultrasonic tips | Experimental | Prepared surfaces will be finished with ultrasonic tips |
|
| Conventional | No Intervention | Prepared surfaces will be finished with ordinary burs |
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Ultrasonic tips | Procedure | These tips are going to be used to give the final shape of the prepared surfaces before taking the impression for the construction of the veneers. |
|
| Measure | Description | Time Frame |
|---|---|---|
| Thickness of the light silicone layer encompassed between the abutment and the veneer | A light silicone material is going to be used to allow for measuring any gaps beneath the veneers. The measurement will be in micrometer using a microscope. | measurement will be made immediately (in the same day) of applying the constructed veneers onto the prepared dental surfaces |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Anas Abdo, DDS | MSc student in Prosthodontics, University of Damascus Dental School | Principal Investigator |
| Mirza Allaf, DDS MSc PhD | Associate Professor of Prosthodontics | Study Director |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Department of Fixed Prosthodontics, University of Damsacus | Damascus | Rif-dimashq Governorate | DM20AM18 | Syria |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 19054303 | Background | Ayad MF. Effects of tooth preparation burs and luting cement types on the marginal fit of extracoronal restorations. J Prosthodont. 2009 Feb;18(2):145-51. doi: 10.1111/j.1532-849X.2008.00398.x. Epub 2008 Nov 18. | |
| 19643221 | Background | Ayad MF, Johnston WM, Rosenstiel SF. Influence of dental rotary instruments on the roughness and wettability of human dentin surfaces. J Prosthet Dent. 2009 Aug;102(2):81-8. doi: 10.1016/S0022-3913(09)60114-1. |
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| ID | Term |
|---|---|
| D014075 | Tooth Discoloration |
| ID | Term |
|---|---|
| D014076 | Tooth Diseases |
| D009057 | Stomatognathic Diseases |
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| 21037189 | Background | Christensen RP, Ploeger BJ. A clinical comparison of zirconia, metal and alumina fixed-prosthesis frameworks veneered with layered or pressed ceramic: a three-year report. J Am Dent Assoc. 2010 Nov;141(11):1317-29. doi: 10.14219/jada.archive.2010.0076. |
| 4555792 | Background | Eick JD, Johnson LN, Fromer JR, Good RJ, Neumann AW. Surface topography: its influence on wetting and adhesion in a dental adhesive system. J Dent Res. 1972 May-Jun;51(3):780-8. doi: 10.1177/00220345720510031401. No abstract available. |
| 2700463 | Background | Finger WJ, Manabe A, Alker B. Dentin surface roughness vs. bond strength of dentin adhesives. Dent Mater. 1989 Sep;5(5):319-23. doi: 10.1016/0109-5641(89)90123-1. |
| 17262225 | Background | Hickel R, Roulet JF, Bayne S, Heintze SD, Mjor IA, Peters M, Rousson V, Randall R, Schmalz G, Tyas M, Vanherle G. Recommendations for conducting controlled clinical studies of dental restorative materials. Clin Oral Investig. 2007 Mar;11(1):5-33. doi: 10.1007/s00784-006-0095-7. Epub 2007 Jan 30. |
| 19544814 | Background | Lange RT, Pfeiffer P. Clinical evaluation of ceramic inlays compared to composite restorations. Oper Dent. 2009 May-Jun;34(3):263-72. doi: 10.2341/08-95. |
| 3306618 | Background | Mowery AS Jr, Parker M, Davis EL. Dentin bonding: the effect of surface roughness on shear bond strength. Oper Dent. 1987 Summer;12(3):91-4. No abstract available. |
| 2845071 | Background | Price RB, Sutow EJ. Micrographic and profilometric evaluation of the finish produced by diamond and tungsten carbide finishing burs on enamel and dentin. J Prosthet Dent. 1988 Sep;60(3):311-6. doi: 10.1016/0022-3913(88)90275-2. No abstract available. |