View clinical trials related to Surface Roughness.
Filter by:Research question: For patients requiring posterior single crowns, does the use of Milled BioHPP PEEK copings veneered with CAD/CAM composite resin offer better surface texture and clinical performance when compared Milled BioHPP PEEK copings veneered with manual layering? Statement of the problem Nowadays, metal free restorations are widely used. PEEK is one among these restorations that has many applications in dental field. Owing to PEEK's excellent mechanical properties, it is gaining popularity in prosthodontics. The opaque nature of PEEK allows its use as a framework material in fixed prosthodontics and composite resin material is used as a veneering material to achieve aesthetics . The compatible composite veneering material can be manufactured by both manual and CAD/CAM techniques. Yet, there is no enough research regarding the influence of the veneering technique on the surface texture and clinical performance of these restorations. Rationale PEEK combination of mechanical properties and high biocompatibility make it a very promising material . PEEK based crowns are veneered by composite resin material. Among the methods of fabrication of veneering composite is the manual layering and CAD/CAM techniques . The surface flaws and internal defects determine the strength of the material and affects its performance . Accordingly the evaluation of the veneering technique is mandatory. The rationale for carrying out this study lies in providing an alternative solution to the manual veneering technique, which will, in-turn, provide better surface properties and clinical performance of the restoration and accordingly increase its longevity. Aim of the study: - The aim of this study is to evaluate the surface texture and clinical performance of milled BioHPP PEEK veneered with CAD/CAM composite resin and compare them to milled BioHPP PEEK veneered manually. Null hypothesis: There is no difference in the surface texture and clinical performance between milled BioHPP PEEK veneered with CAD/CAM composite resin and milled BioHPP PEEK veneered manually. Primary objective: - Primary outcome: (surface texture) of the two groups will be assessed using the modified USPHS. - Secondary outcome: (fracture) of the two groups will be assessed using the modified Ryge criteria.
The buccal and lingual surface of the 23 participants' crowns will be randomly assigned to receive scaling and root planing with either Teflon scalers, or non-Teflon scalers after implant crown delivery. Each patient will act as their own control. Patients will receive scaling and root planing at 3, 6, 9 and 12 months by a calibrated dental hygienist. All surfaces of the implant will be debrided for 1 minute using a transversal movement. Each patient will receive oral hygiene instructions by the hygienist at the end of each maintenance therapy appointment. The participants will be instructed to use a Modified Stillman brushing technique twice per day and cross shoe shine flossing motion once per day. Each patient will be provided with a three-month home care kit with dental aids. These aids will consist of toothpaste, a toothbrush and implant floss. Measurements will be taken at 0, 3, 6, 9 and 12 months by a calibrated periodontal resident. The parameters assessed at the implant site and patient level will be modified plaque index (IPI) by Mombelli, modified gingival index (IBOP) by Mombelli, implant probing depths (PD) at six sites, presence of keratinized gingiva (KT), recession (REC), Full mouth plaque index (FPI) and Full mouth bleeding on probing (FBOP). The Peri-implant Crevicular Fluid will be collected at 0, 3, and 12 months by isolating the implant site from saliva and introducing Periopaper strips into the buccal, mesial, distal and lingual sites of the implant sulcus for 30 seconds. The strips will be placed in a sealed Eppendorf tubes and transported by portable freezer to the laboratory where they will be stored at -86 degrees Celsius. The Periopaper samples will be treated for the detection and quantification of the following cytokines: Interleukin-2, Interleukin-4, Interleukin-6, Interleukin-8, Interleukin-10, Tumor Necrosis Factor alpha and Interferon gamma. Periapicals will be taken at baseline and 12 months. All radiographs will be standardized. After 12 months, the implant crown will be removed and the implant crown's surface alterations will be evaluated using atomic force microscopy (AFM) using the RA, or average roughness, and the RZ, or mean roughness depth, scores. The implant crown surface will then be repolished/reglazed and delivered back to the patient's mouth. Crowns will be evaluated before delivery to determine adequate level of smoothness. Based on the presence of cytokines in the Peri-implant Crevicular Fluid, the degree of surface alterations, the modified plaque index, implant probing depths, full mouth plaque index, and full mouth bleeding on probing, we can determine if scratching affects the inflammation around the screw retained dental implant.