The purpose of the study is to determine if there is an association between the intaglio shape of full-arch implant-supported prosthesis and marginal bone level around implants. The intaglio shape can be present as concave or convex and, depending on that, it can lead to more plaque accumulation on the fitting surface of the prosthesis. Null Hypothesis (H0): Full-arch implant supported prosthesis with an increased depth of the intaglio shape demonstrate similar marginal bone levels as prosthesis with a reduced depth of the intaglio surface. Alternative Hypothesis (H1): Full-arch implant supported prosthesis with an increased depth of the intaglio shape demonstrate increased/reduced marginal bone levels compared to prosthesis with a reduced depth of the intaglio surface.
The investigators will review dental records from the university and call eligible individuals for an appointment. During the research visit, the investigators will take new x-rays for marginal bone level assessment and a digital scan of the prosthesis to assess the shape of the intaglio. Also, remove the prosthesis, perform clinical measurements and collect plaque samples from the prosthesis and the implant sulcus. then, implants and prosthesis will be cleaned and placed in position. The study will have only one appointment where every measurement will be assessed in this visit.
Study Type
OBSERVATIONAL
Enrollment
50
design
University of Pittsburgh, School of Dental Medicine
Pittsburgh, Pennsylvania, United States
Evaluation of the depth of the shape of the intaglio surface of full-arch and its association with increased marginal bone level.
After the prosthesis is scanned, and evaluation of the 3D file of the prosthesis will occur. A virtual line will be traced between the Buccal to the Palatal/Lingual flange of the prosthesis. In the middle point of this line, a perpendicular line will be traced in direction of the fitting surface of the prosthesis, intaglio, and this distance will be measured in mm.
Time frame: The measurements will be assessed during the unique visit of the patient in the study.
Probing Depth of the implants
Using a periodontal probe we will register Probing Depth in 6 sites per implant. All measures will be in mm.
Time frame: The measurements will be assessed during the unique visit of the patient in the study.
Bleeding on Probing of the implants
Using a periodontal probe we will register Bleeding in 6 sites using the bleeding indexes modified for dental implants.
Time frame: The measurements will be assessed during the unique visit of the patient in the study.
Modified Plaque Index
Plaque accumulation will be evaluated using the modified plaque index adapted for dental implants.
Time frame: The measurements will be assessed during the unique visit of the patient in the study.
Marginal Recession
The distance, in mm, between the implant platform and the mucosal margin.
Time frame: The measurements will be assessed during the unique visit of the patient in the study.
Suppuration
Assessed by the presence/absence of suppuration after gentle probing of the implants.
Time frame: The measurements will be assessed during the unique visit of the patient in the study.
Keratinized mucosa width
Measured from the mucosal marginal level of the implants to the mucogingival junction. The band of keratinized mucosa will be characterized as narrow \< 2mm and wide \> 2mm.
Time frame: The measurements will be assessed during the unique visit of the patient in the study.
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