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| research Fig. 4: SKY elegance abutment. 10 implants 2 2017 Additional criteria for inclusion in the study included sufficient bone height and width to allow the placement of implants with a mini- mum diameter of 4.1 mm and a minimum length of 10 mm and an occlusal pattern that allowed for bilateral stability. All subjects needed to have at least 3 mm of soft tissue (vertically) to allow for the establishment of an adequate biologic width and to reduce bone resorption. Exclusion criteria included severe maxillomandibular skeletal discrepan- cies, non-controlled diabetes, haemophilia, metabolic bone disorders, a history of renal failure or radiation treatment of the head or neck region, ongoing chemotherapy, preg- nancy, drug or alcohol abuse, poor oral hy- giene, insufficient bone volume at the recipi- ent site, and the need for bone augmentation prior to implant placement. Day 0 (surgical planning and protocol) A full-thickness incision was made with a No. 15c blade, combining an intrasulcular with a crestal incision in the palatal area. A full flap was reflected using a periosteotome. The manufacturer’s implant placement protocol for blueSKY implants (bredent medical) was followed. After placement, the site was closed using 4-0 polypropylene single sutures. – Postsurgical care: All patients received anti- inflammatory treatment (NSAID), ibuprofen 3 x 400 mg/day for three days and two chlor- hexidine 0,12 % rinses per day for two days. – Implants: Ten blueSKY implants (bredent medical) 3.5–4 mm in diameter and 10–12 mm in length were randomly assigned and placed crestally in the premolar zone (P1 or P2) of the maxilla. – Abutments: Ten BioHPP SKY elegance abutments were connected at the time of implant placement (immediate loading). The SKY elegance is a hybrid abutment with a body made of BioHPP moulded directly onto the titanium base without a gap. These abutments are used for single-session im- mediate-restoration treatments, since they com- bine the properties of a temporary and a definitive abutment, i.e. it is not necessary to change the abutment. All crowns were realized using the CEREC system (Sirona, Bensheim, Germany) with IPS Empress CAD CEREC/InLab (Ivoclar Vivadent, Schaan, Liechtenstein) feldspar ceramics. The crowns were cemented with RelyX self-adhesive cement (3M ESPE, Neuss, Germany; Fig. 4). All im- plants were loaded using a platform-switching protocol. Analysis – Radiological analysis: Standardized radiographs were taken on the day of placement and at one, three and five months using a one-position paralleling system. The analysis was performed with the ImageJ software (Wayne Rasband, NIH, Bethesda, USA). The distances between the platforms and the points of first bone con- tact were recorded. – ISQ stability analysis: Stability measure- ments were made on day 0 to assess the pri- mary stability of the implant required for the immediate-loading protocol. An ISQ of 65 was defined as the minimum value needed (Osstell Mentor; Osstell, Göteborg, Sweden). – Mucogingival analysis and clinical findings: The bleeding index was recorded one, three and five months after implant placement by means of a special peri-implant probe. More- over, any post-insertion loss of peri-implant mucosa or height were recorded. Bleeding on probing (0 = absent, 1 = present) was measured at one, three and five months. The insertion length was measured with a conventional plastic probe by one examiner per examination period and six measurements for each implant. The results were presented as means of six measurements. – Statistical analysis: Values were recorded as mean ± standard deviation (SD) and median. The non-parametric Friedman test was applied to compare sample values. The level of significance was set at p < 0.05._ Editorial note: To be continued in implants 3/2017 with results and discussion. This article was first published in EDI Journal No 1/2016. Author details Literature contact José Eduardo Maté Sánchez de Val Plaza de Luceros n. 15, bj. izq. 03004 Alicante, Spain jemate@ucam.edu