{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,21]],"date-time":"2026-02-21T11:06:29Z","timestamp":1771671989272,"version":"3.50.1"},"reference-count":38,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2020,10,3]],"date-time":"2020-10-03T00:00:00Z","timestamp":1601683200000},"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":["J Esthet Restor Dent"],"published-print":{"date-parts":[[2022,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objectives<\/jats:title><jats:p>This study examined the in vitro fatigue resistance of maxillary premolars with 2\u2009mm or 3\u2009mm preserved cusp thicknesses restored with lithium disilicate onlays.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>Premolars(N\u00a0=\u00a048) were divided into six groups. Onlays for groups 1 to 4 preserved a 3\u2009mm functional (G1), 2\u2009mm functional (G2), 3\u2009mm nonfunctional (G3), or 2\u2009mm nonfunctional (G4) buccal\u2010lingual cusp width. Onlays for group 5 (G5, control) replaced both cusps. Group 6 (G6) samples were identical to G1 with added retentive boxes. Lithium disilicate onlays were exposed to thermocycling (10\u00a0000\u2009cycles, 5\u00b0C\u201055\u00b0C, 30s\/cycle) and mechanical loading (1.2 million cycles at 1.4\u00a0Hz and 70\u2009N). All samples were examined for onlay debonding or cusp or onlay fracture.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Failure rates were 75%(G1), 0.0%(G2), 12.5%(G3), 0.0%(G4), 0.0%(G5), and 0.0%(G6). The difference in percent failure between the groups preserving the functional cusps (37.5%) and the groups preserving the nonfunctional cusps (6.3%) was statistically significant (<jats:italic>P<\/jats:italic>\u00a0=\u00a0.04; 95%CI:2.11\u201055.66). No cusp or restoration fractures were observed; all failures were due to debonding of the restoration.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Teeth with thin remaining cusps that were restored with bonded lithium disilicate onlay restorations were not prone to fracture. Retentive preparation features that physically eliminated lateral displacement prevented onlay debonding even though the ceramic\u2010enamel margin was directly at the occlusal contact.<\/jats:p><\/jats:sec><jats:sec><jats:title>Clinical significance<\/jats:title><jats:p>The use of adhesively retained lithium disilicate ceramic onlays may be a viable alternative to full coverage restorations and may challenge traditionally accepted principals related to preparation resistance and retention form of ceramic partial coverage restorations.<\/jats:p><\/jats:sec>","DOI":"10.1111\/jerd.12666","type":"journal-article","created":{"date-parts":[[2020,10,3]],"date-time":"2020-10-03T07:41:28Z","timestamp":1601710888000},"page":"512-518","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["<scp>Tooth\u2010cusp<\/scp> preservation with lithium disilicate onlay restorations: A fatigue resistance study"],"prefix":"10.1111","volume":"34","author":[{"given":"Elizabeth","family":"Griffis","sequence":"first","affiliation":[{"name":"LCDR, Dental Corps United States Navy  California USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7293-3112","authenticated-orcid":false,"given":"Islam","family":"Abd Alraheam","sequence":"additional","affiliation":[{"name":"Conservative Dentistry Department University of Jordan  Amman Jordan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lee","family":"Boushell","sequence":"additional","affiliation":[{"name":"Division of Comprehensive Oral Health, Adams School of Dentistry University of Chapel Hill  Chapel Hill North Carolina USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Terrence","family":"Donovan","sequence":"additional","affiliation":[{"name":"Division of Comprehensive Oral Health, Adams School of Dentistry University of Chapel Hill  Chapel Hill North 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