https://www.arabsciencepedia.org/w/index.php?action=history&feed=atom&title=Lewis_offset 2026-05-14T09:52:20Z تاريخ التعديل لهذه الصفحة في الويكي MediaWiki 1.43.6 https://www.arabsciencepedia.org/w/index.php?title=Lewis_offset&diff=38034&oldid=prev 2016-11-14T04:09:02Z

<p>مراجعة واحدة</p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <tr class="diff-title" lang="ar"> <td colspan="1" style="background-color: #fff; color: #202122; text-align: center;">→ مراجعة أقدم</td> <td colspan="1" style="background-color: #fff; color: #202122; text-align: center;">مراجعة 04:09، 14 نوفمبر 2016</td> </tr><tr><td colspan="2" class="diff-notice" lang="ar"><div class="mw-diff-empty">(لا فرق)</div> </td></tr></table>

إدارة الموسوعة 1 https://www.arabsciencepedia.org/w/index.php?title=Lewis_offset&diff=38033&oldid=prev 2016-09-24T01:52:49Z

<p></p> <p><b>صفحة جديدة</b></p><div>{{Multiple issues|<br /> {{expert-subject|date=January 2011}}<br /> {{lead rewrite|date=January 2011}}<br /> }}<br /> [[File:Mandibular 1st Molar.svg|thumbnail|right|Mandibular first molar.]]<br /> The &#039;&#039;&#039;Lewis offset&#039;&#039;&#039; is a term for the portion of the central groove on a permanent [[mandibular first molar]] which lies between the two central pits. It lies at an angle to the mesio-distal axis of the tooth, and causes the [[mesial]] portion of the central groove to be located further [[Anatomical terms of location#Teeth|buccally]] than the [[Anatomical terms of location#Proximal and distal|distal]] portion. This [[Anatomical terms of location#Teeth|buccolingual]] shift correlates with a relative difference in size between the mesial and distal cusps on these teeth - the [[Anatomical terms of location#Teeth|mesiolingual]] cusp is larger than the [[Anatomical terms of location#Teeth|mesiobuccal]] cusp, but the [[Anatomical terms of location#Teeth|distobuccal]] cusp is larger than the [[Anatomical terms of location#Teeth|distolingual]] cusp. It also allows for the buccal groove to be located mesial to the lingual groove which is mandatory to accommodate the relative sizes of the three cusps on the buccal and two cusps on the lingual of the [[Anatomical terms of location#Teeth|occlusal]] surface of the tooth.<br /> <br /> The offset is named for long time dental anatomy instructor Dr. Christopher S. Lewis, a Mercer Island, WA dentist.<br /> ==References==<br /> <br /> {{reflist}}<br /> *Ash, Major M. and Stanley J. Nelson, 2003. &#039;&#039;Wheeler’s Dental Anatomy, Physiology, and Occlusion.&#039;&#039; 8th edition.<br /> <br /> {{Tooth anatomy}}<br /> <br /> {{DEFAULTSORT:Lewis Offset}}<br /> [[Category:Teeth]]<br /> <br /> <br /> {{dentistry-stub}}<br /> <br /> [[nl:Eerste molaar]]<br /> [[pt:Primeiro molar inferior]]</div>

2601:600:9300:F36:695C:D8BC:61AE:2371