A prospective randomized controlled clinical trial will be conducted. Study groups will be assigned as described above. The patients will be randomly divided into two groups in order to study the influence of prosthetic screw abutment in marginal bone loss (MBL) around Bone Level Tapered implants (BLT® Roxolid® SLActive® guided implants, Straumann Dental Implant System, Institut Straumann AG, Basel, Switzerland).
48 patients will be selected with partial edentulism in the maxilla or mandible, requiring two dental implants in the posterior areas (molars and premolars). Each patient will be randomly allocated in one of the two groups: test group (n=36) or control group (n=12) and all the implants will be placed by residents of the International Master in Oral Surgery and Master in Periodontics of the same University. Study groups Group 1: Two stage approach (cover screw in first surgery and healing abutment in second surgery) (12 patients) Group 2: One stage approach (healing cap over trans-epithelial abutments) (36 patients).Two subgroups according to different trans-epithelial height abutment: * Subgroup 2.1: Screw-retained abutment of 1 mm height (18 patients) * Subgroup 2.2: Screw-retained abutment of 2.5 mm height (18 patients) Clinical Parameters and Outcomes * Three-dimensional volumetric changes in hard and soft tissues (Cone-beam computed tomography superposed with digital cast models). * Marginal bone level (MBL) change: Standardized intraoral periapical x-rays will be taken on the day of surgery, 4, 6, 12, 24 and 36 months following surgery. * Probing depth, bleeding on probing and keratinized mucosa width will be measured in the follow-up visits in 3 different points in buccal (Mesial, center and distal). * VAS Scale: The visual analog scale or visual analog scale (VAS).
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
30
Dental implant placement using cover screws (first surgery) and a healing abutment (second surgery) or definitive transepithelial abutments the same day of the implant placement (one unit surgery)
Universitat Internacional de Catalunya
Barcelona, Spain
Marginal Bone Loss
Periimplant bone level by measuring from the implant platform to the first bone to implant contact. Messuret in 2 points: MESIAL AND DISTAL with intra-oral XR. (measured in millimeters). The mean of this two-points for each implant was calculated. Afterwards, the mean for the mesial implants, distal and total implant sample per group was calculated.
Time frame: After implant loading (baseline)and once every year to 24 months follow-up
Probing Depth
Measuring this outcomes at 4 different points .(Mesial Buccal, Center Buccal, Distal Buccal and central lingual) (measured in millimeters).
Time frame: After implant loading (baseline)and once every year to 36 months follow-up
Bleeding on Probing
Measuring this outcomes at 4 different points .(Mesial Buccal, Center Buccal, Distal Buccal and central lingual) (measured in millimeters).
Time frame: After implant loading (baseline)and once every year to 36 months follow-up
Keratinized Mucosa Width
Measuring this outcomes at 4 different points .(Mesial Buccal, Center Buccal, Distal Buccal and central lingual) (measured in millimeters).
Time frame: After implant loading (baseline)and once every year to 36 months follow-up
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