{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,12]],"date-time":"2026-03-12T02:04:57Z","timestamp":1773281097381,"version":"3.50.1"},"reference-count":0,"publisher":"Wiley","issue":"11","license":[{"start":{"date-parts":[[1998,11,1]],"date-time":"1998-11-01T00:00:00Z","timestamp":909878400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Periodontology"],"published-print":{"date-parts":[[1998,11]]},"abstract":"<jats:p>U<jats:sc>se of<\/jats:sc> E<jats:sc>r<\/jats:sc>:YAG <jats:sc>laser has been proposed<\/jats:sc> for the removal of microbial deposits and calculus present on teeth affected by periodontal disease. However, the influence of Er:YAG laser irradiation on root surfaces has not yet been fully investigated. The aim of the present study was to evaluate the effects of Er:YAG laser irradiation on root cementum by scanning electron microscopy (SEM). Specimens were obtained from extracted human periodontally\u2010diseased teeth using a water\u2010cooled high\u2010speed bur. An Er:YAG laser beam was then applied at various powers ranging from 25 to 100 mJ\/pulse\/sec. The laser irradiation was performed under water irrigation, with the tip held perpendicular to the root surface in the contact mode. Following laser exposure, specimens were fixed, dehydrated, and dried at critical\u2010point in liquid CO<jats:sub>2<\/jats:sub>. After mounting on SEM plates and sputter\u2010coating with gold, the cementum surface was examined by SEM. Observations of the root surface showed a relatively flat surface in control specimens. In Er: YAG exposed specimens, the laser beam created a circular, notchededge, crater\u2010like defect on the root. The bottom of the lesion showed an irregular and sharp\u2010pointed surface. Subsequently, the specimens were fractured with a sharp scalpel perpendicularly to the surface. SEM observations of these specimens showed a 15 pm layer of damaged tissue within the laser\u2010irradiated cementum. The tissue presented an amorphous appearance and the Sharpey's and matrix fiber bundles were not clearly distinguishable. These observations indicate that cementum tissue could be damaged by Er:YAG laser irradiation. <jats:italic>J Periodontol 1998;69:1283\u20131290<\/jats:italic>.<\/jats:p>","DOI":"10.1902\/jop.1998.69.11.1283","type":"journal-article","created":{"date-parts":[[2012,3,20]],"date-time":"2012-03-20T12:44:33Z","timestamp":1332247473000},"page":"1283-1290","source":"Crossref","is-referenced-by-count":37,"title":["Scanning Electron Microscopic Study of the Effects of Er:YAG Laser on Root Cementum"],"prefix":"10.1002","volume":"69","author":[{"given":"Takeo","family":"Fujii","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pierre C.","family":"Baehni","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Osamu","family":"Kawai","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tomofumi","family":"Kawakami","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Koichi","family":"Matsuda","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yusuke","family":"Kowashi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[1998,11]]},"container-title":["Journal of Periodontology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/aap.onlinelibrary.wiley.com\/doi\/pdf\/10.1902\/jop.1998.69.11.1283","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,19]],"date-time":"2025-10-19T13:24:22Z","timestamp":1760880262000},"score":1,"resource":{"primary":{"URL":"https:\/\/aap.onlinelibrary.wiley.com\/doi\/10.1902\/jop.1998.69.11.1283"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1998,11]]},"references-count":0,"journal-issue":{"issue":"11","published-print":{"date-parts":[[1998,11]]}},"alternative-id":["10.1902\/jop.1998.69.11.1283"],"URL":"https:\/\/doi.org\/10.1902\/jop.1998.69.11.1283","archive":["Portico"],"relation":{},"ISSN":["0022-3492","1943-3670"],"issn-type":[{"value":"0022-3492","type":"print"},{"value":"1943-3670","type":"electronic"}],"subject":[],"published":{"date-parts":[[1998,11]]}}}