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<p class="tableOfContents"><strong>Table of Contents: <a href="/pubs/techbull/so21/so21_issue_cover.html">2021 SEPTEMBER&#8211;OCTOBER No. 442</a></strong></p>
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<h1 class="articleH1">NLM Classification 2021 Summer Edition Now Available</h1>
<p class="tbyearmonth">Willis, S. NLM Classification 2021 Summer Edition Now Available. NLM Tech Bull. 2021 Sep-Oct;(442):e1.</p>
<div class="articleactions">2021 September 21 <span class="status">[posted]</span>
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<div class="articleParagraph">
<h1>70<sup>th</sup> Anniversary of the NLM Classification</h1>
<p>2021 marks the 70<sup>th</sup> anniversary of the <a href="https://classification.nlm.nih.gov/"><em>NLM Classification</em></a>. The first edition of the classification was published in 1951 as the <a href="https://collections.nlm.nih.gov/catalog/nlm:nlmuid-101587919-bk"><em>U.S. Army Medical Library Classification</em></a>. The name changed to the <em>National Library of Medicine Classification</em> with the second edition in 1956 to coincide with the library's name change. It is still recognized as a standard classification system for the arrangement of library materials in the field of medicine and related sciences used by health and medical libraries all over the world.</p>
<p></p>
<h1>Systematic Reviews for the 2021 Summer Edition</h1>
<p>The classification has been steadily built for over 70 years based on the scientific knowledge and current events of the time. A major restructuring of the entire classification is not feasible, but an annual systematic review of selected schedules is conducted.</p>
<p>The major focus of the 2021 summer edition was the systematic review of the following schedules: WU (Dentistry. Oral Surgery) and WV (Otolaryngology).</p>
<h2>Statistics from the WU (Dentistry. Oral Surgery) Systematic Review</h2><ul>
<li><strong>23 WU class numbers added</strong></li>
</ul>
<table style="height: 252px; width: 80%;">
<tbody>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;"><strong>New Class Number</strong></td>
<td style="width: 86.636%; height: 18px;"><strong>Caption</strong></td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 29.1</td>
<td style="width: 86.636%; height: 18px;">General coverage (Not Table-G)</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 29.3</td>
<td style="width: 86.636%; height: 18px;">Medical emergencies during dental care</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 29.5</td>
<td style="width: 86.636%; height: 18px;">Dental infection control</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 115</td>
<td style="width: 86.636%; height: 18px;">Oral hygiene</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 120</td>
<td style="width: 86.636%; height: 18px;">Dental health education</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 140.8</td>
<td style="width: 86.636%; height: 18px;">Mouth diseases</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 192</td>
<td style="width: 86.636%; height: 18px;">Dental cements</td>
</tr>
<tr>
<td style="width: 13.3641%;">WU 194</td>
<td style="width: 86.636%;">Dental porcelain</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 195</td>
<td style="width: 86.636%; height: 18px;">Dental synthetic resins</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 215</td>
<td style="width: 86.636%; height: 18px;">Tooth</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 235</td>
<td style="width: 86.636%; height: 18px;">Tooth root. Root canal therapy</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 240.5</td>
<td style="width: 86.636%; height: 18px;">Gingiva</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 241</td>
<td style="width: 86.636%; height: 18px;"> Periodontal diseases (General and not elsewhere classified)</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 246</td>
<td style="width: 86.636%; height: 18px;">Tooth diseases (General or not elsewhere classified)</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 247</td>
<td style="width: 86.636%; height: 18px;">Tooth injuries</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 260</td>
<td style="width: 86.636%; height: 18px;">Tooth abnormalities</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 272</td>
<td style="width: 86.636%; height: 18px;">Fluoridation. Fluoride treatment</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 355</td>
<td style="width: 86.636%; height: 18px;">Dental restoration</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 510</td>
<td style="width: 86.636%; height: 18px;">Dental prosthesis</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 511</td>
<td style="width: 86.636%; height: 18px;">Crowns</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 512</td>
<td style="width: 86.636%; height: 18px;">Dentures</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 450</td>
<td style="width: 86.636%; height: 18px;">Public health dentistry</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WU 626</td>
<td style="width: 86.636%; height: 18px;">Maxillofacial prosthesis</td>
</tr>
</tbody>
</table>
<ul>
<li><strong>7 WU numbers cancelled</strong></li>
</ul>
<table style="width: 80%; border-collapse: collapse;">
<tbody>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;"><strong>Deleted Class Number</strong></td>
<td style="width: 43.318%; height: 18px;"><strong>Former Caption</strong></td>
<td style="width: 43.318%; height: 18px;"><strong>New Instructions for Classification</strong></td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">[WU 18.5]</td>
<td style="width: 43.318%; height: 18px;">Education of dental assistants, hygienists, and technicians</td>
<td style="width: 43.318%; height: 18px;"> Classify works on education of dental auxiliaries in WU 18.</td>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">[WU 105]</td>
<td style="width: 43.318%; height: 18px;">Dental emergencies (General)</td>
<td style="width: 43.318%; height: 18px;">Classify works on medical emergencies during dental care in WU 29.3.</td>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">[WU 141.5]</td>
<td style="width: 43.318%; height: 18px;">Specific diagnostic methods, A-Z</td>
<td style="width: 43.318%; height: 18px;">Classify specific diagnostic methods in WU 141.</td>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">[WU 141.5.C3]</td>
<td style="width: 43.318%; height: 18px;">Cephalometry</td>
<td style="width: 43.318%; height: 18px;">Classify works on cephalometry used in dentistry in WU 141. </td>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">[WU 141.5.O2]</td>
<td style="width: 43.318%; height: 18px;">Odontometry</td>
<td style="width: 43.318%; height: 18px;">Classify works on odontometry in WU 215.</td>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">[WU 158]</td>
<td style="width: 43.318%; height: 18px;">Oral and dental injuries (General)</td>
<td style="width: 43.318%; height: 18px;">Classify works on tooth injuries in WU 247. Classify works on mouth injuries in WU 140.8.</td>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">[WU 170]</td>
<td style="width: 43.318%; height: 18px;">Dental chemistry (General)</td>
<td style="width: 43.318%; height: 18px;">Classify works on chemistry in LC's QD schedule.</td>
</tbody>
</table>
<ul>
<li>39 WU class number, captions, or notes were modified</li>
<li>4 class numbers captions or notes modified in other schedules related to the WU systematic review</li>
<li>13 index main headings added</li>
<li>148 index entries modified</li>
<li>44 index main headings deleted</li>
</ul>
<h2>Statistics from the WV (Otolaryngology) Systematic Review</h2><ul>
<li><strong>4 WV class numbers added</strong></li>
</ul>
<table style="height: 100px; width: 80%; border-collapse: collapse;">
<tbody>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;"><strong>New Class Number</strong></td>
<td style="width: 86.636%; height: 18px;"><strong>Caption</strong></td></tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WV 257</td>
<td style="width: 86.636%; height: 18px;">Vestibular diseases</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WV 268</td>
<td style="width: 86.636%; height: 18px;">Vestibulocochlear physiological phenomena. Hearing</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WV 480</td>
<td style="width: 86.636%; height: 18px;">Larynx</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">WV 485</td>
<td style="width: 86.636%; height: 18px;">Laryngeal diseases (General or not elsewhere classified)</td>
</tr>
</tbody>
</table>
<ul>
<li><strong>5 WV numbers cancelled</strong></li>
</ul>
<table style="width: 80%; border-collapse: collapse;">
<tbody>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;"> <strong>Deleted Class Number</strong></td>
<td style="width: 43.318%; height: 18px;"><strong>Former Caption</strong></td>
<td style="width: 43.318%; height: 18px;"><strong>New Instructions for Classification</strong></td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">[WV 280]</td>
<td style="width: 43.318%; height: 18px;">Deaf-mutism</td>
<td style="width: 43.318%; height: 18px;">Classify works on mutism associated with deafness in WV 270.</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">[WV 310]</td>
<td style="width: 43.318%; height: 18px;">External nose</td>
<td style="width: 43.318%; height: 18px;">Classify works on the nose in WV 300-WV 301.</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">[WV 400]</td>
<td style="width: 43.318%; height: 18px;">General works</td>
<td style="width: 43.318%; height: 18px;">Classify general works on the pharyngeal region in WV 410.</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">[WV 401]</td>
<td style="width: 43.318%; height: 18px;">Anatomy. Physiology</td>
<td style="width: 43.318%; height: 18px;">Classify works on anatomy and physiology of the pharynx in WV 410.</td>
</tr>
<tr style="height: 18px;">
<td style="width: 13.3641%; height: 18px;">[WV 510]</td>
<td style="width: 43.318%; height: 18px;">Inflammation</td>
<td style="width: 43.318%; height: 18px;">Classify works on laryngitis in WV 485.</td>
</tr>
</tbody>
</table>
<ul>
<li>27 WV class number captions or notes modified</li>
<li>1 class number caption modified in another schedule related to the WV systematic review</li>
<li>4 index main headings added</li>
<li>72 index entries modified</li>
<li>19 index main headings deleted</li>
</ul>
<p></p>
<h1>Next Edition</h1>
<p>The 2022 winter edition will be published in late January 2022. It will encompass the additions and changes from the <a href="https://meshb-prev.nlm.nih.gov/search">2022 MeSH</a> (Medical Subject Headings) vocabulary as evaluated for inclusion in the Classification index. All main index headings will be linked to the 2022 vocabulary in the MeSH Browser at that time.</p>
<p>By Sharon R. Willis<br />Cataloging and Metadata Management Section, Technical Services Division</p>
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