{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,4]],"date-time":"2026-09-04T18:02:44Z","timestamp":1788544964708,"version":"build-2803163510"},"reference-count":33,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2020,11,10]],"date-time":"2020-11-10T00:00:00Z","timestamp":1604966400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Prosthodontics"],"published-print":{"date-parts":[[2021,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>The aim of this study was to investigate the effect of implant screw channel angulation on the fracture resistance of zirconia abutments without artificial aging.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>Ten implant replicas were embedded in a jig of autopolymerizing acrylic resin. Using a surveyor and a metallic platform, the implant replicas were mounted centrally and with an angulation of 30\u00b0. A maxillary left central incisor crown was fabricated from pattern resin and scanned. The digital design of a monolithic zirconia implant abutment\u2010crown was completed using a 3D imaging software. For all specimens of this group (ASC<jats:sub>25<\/jats:sub>), the screw channel was positioned at 25\u00b0 to the lingual. Following fabrication, the samples were attached onto the embedded implant replicas and manually torqued to 35 Ncm as recommended by the manufacturer. The monolithic zirconia implant abutment\u2010crowns were mounted in a metallic platform, positioned perpendicular to the indenter, and subjected to loading until failure. Crosshead speed was set at 0.5 mm\/min for the universal testing machine. Data from a similar in vitro study where straight zirconia custom abutments (ASC<jats:sub>0<\/jats:sub>) were subjected to static load until failure was used as a control group. An unpaired Student's t\u2010test was used to determine if fracture resistance based on load at failure and maximum load in each group were significantly different from each other (ASC<jats:sub>25<\/jats:sub> vs ASC<jats:sub>0<\/jats:sub>). Statistical significance level was inferred at <jats:italic>p<\/jats:italic> \u2264 0.05<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Group ASC<jats:sub>25<\/jats:sub> fractured at a mean (SD) load of 215.49 (47.10) N and a mean (SD) maximum load of 420.50 (17.18) N. Group ASC<jats:sub>0<\/jats:sub> fractured at a mean (SD) load of 534.04 (133.77) N and a mean (SD) maximum load of 762.69 (109.59) N. The difference was statistically significant for both mean load and mean maximum load at failure (<jats:italic>p<\/jats:italic> \u2264 0.05). The survival rate of 0\u00b0 zirconia abutments was significantly higher than that of 25\u00b0 ASC zirconia abutments.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Within the limitations of this in vitro study the mean fracture load was significantly higher in the group with a straight channel angulation.<\/jats:p><\/jats:sec>","DOI":"10.1111\/jopr.13275","type":"journal-article","created":{"date-parts":[[2020,11,10]],"date-time":"2020-11-10T22:20:58Z","timestamp":1605046858000},"page":"329-334","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Influence of Screw Channel Angulation on the Fracture Resistance of Zirconia Abutments: An In Vitro Study"],"prefix":"10.1111","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2657-3731","authenticated-orcid":false,"given":"Sabrina","family":"Garcia\u2010Hammaker","sequence":"first","affiliation":[{"name":"Biologic and Materials 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