{"id":2097,"date":"2026-05-07T18:31:40","date_gmt":"2026-05-07T10:31:40","guid":{"rendered":"https:\/\/www.own-smile.com\/uncategorized\/\/"},"modified":"2026-06-22T16:26:30","modified_gmt":"2026-06-22T08:26:30","slug":"zirconia-crack-after-sintering","status":"publish","type":"post","link":"https:\/\/www.own-smile.com\/es\/dental-knowledge\/zirconia-crack-after-sintering\/","title":{"rendered":"Why Does Zirconia Crack After Sintering?"},"content":{"rendered":"\n<!-- ZIRCONIA CRACKING BLOG START -->\n<style>\n.os_article,\n.os_meta,\n.os_author_block {\n  font-family: \"Roboto\", sans-serif;\n  max-width: 900px;\n  margin: 0 auto;\n  color: #3f3f3f;\n  line-height: 1.8;\n}\n\n.os_meta,\n.os_article,\n.os_author_block {\n  padding: 20px;\n}\n\n.os_article h2 {\n  font-size: 26px;\n  color: #1260a0;\n  margin: 42px 0 16px;\n  border-bottom: 2px solid #e2e6ea;\n  padding-bottom: 8px;\n}\n\n.os_article h3 {\n  font-size: 20px;\n  color: #3f3f3f;\n  margin: 28px 0 12px;\n}\n\n.os_article 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{\n  margin: 0 0 6px;\n  font-size: 16px;\n  color: #3f3f3f;\n}\n\n.os_author_info p {\n  margin: 0 0 10px;\n  font-size: 14px;\n  color: #606060;\n  line-height: 1.6;\n}\n\n.os_author_review {\n  margin-top: 8px;\n  font-size: 13px;\n  color: #888;\n}\n\n.os_disclaimer_bottom {\n  margin-top: 16px;\n  background: #f5f7f9;\n  border-radius: 10px;\n  padding: 16px 18px;\n  font-size: 13px;\n  color: #606060;\n  line-height: 1.6;\n  border: 1px solid #e2e6ea;\n}\n\n@media (max-width: 768px) {\n  .os_article h1 {\n    font-size: 28px;\n  }\n\n  .os_article h2 {\n    font-size: 23px;\n  }\n\n  .os_diag_head {\n    display: none;\n  }\n\n  .os_diag_row {\n    grid-template-columns: 1fr;\n    padding: 14px 16px;\n  }\n\n  .os_diag_cell {\n    padding: 4px 0;\n  }\n\n  .os_diag_cell::before {\n    display: block;\n    font-size: 12px;\n    font-weight: 700;\n    color: #888;\n    text-transform: uppercase;\n    letter-spacing: 0.03em;\n    margin-bottom: 2px;\n  }\n\n  .os_diag_symptom::before {\n    content: \"What you see\";\n  }\n\n  .os_diag_cause_wrap::before {\n    content: \"Most likely cause\";\n  }\n\n  .os_diag_check::before {\n    content: \"Check first\";\n  }\n\n  .os_author_card {\n    align-items: flex-start;\n  }\n}\n<\/style>\n\n<div class=\"os_meta\">\n\n  <div class=\"os_top_author\">\n    <div class=\"os_avatar\">AX<\/div>\n    <div class=\"os_top_text\">\n      <strong>Written by Amanda Xie<\/strong>, Digital Marketing Manager, Ownsmile<br>\n      <a href=\"https:\/\/www.linkedin.com\/in\/amanda-xie-260964150\/\" target=\"_blank\" rel=\"noopener\">LinkedIn<\/a>\n      \u00b7 Technical review by <a href=\"https:\/\/www.linkedin.com\/in\/eric-liu-ba680034a\/\" target=\"_blank\" rel=\"noopener\">Eric Liu<\/a>, CEO, Ownsmile\n      <span class=\"os_updated\"> \u00b7 Last Updated: May 2026<\/span>\n    <\/div>\n  <\/div>\n\n  <div class=\"os_disclosure\">\n    <strong>Disclosure:<\/strong> Ownsmile manufactures zirconia blocks. This article provides educational information based on published peer-reviewed research. All clinical data is independently sourced and cited.\n  <\/div>\n\n  <div class=\"os_toc\">\n    <h3>Table of contents<\/h3>\n    <ol>\n      <li><a href=\"#intro\">Introduction<\/a><\/li>\n      <li><a href=\"#causes\">Common causes of zirconia cracking after sintering<\/a><\/li>\n      <li><a href=\"#troubleshoot\">How we troubleshoot zirconia cracking in the lab<\/a><\/li>\n      <li><a href=\"#diagnosis\">Quick diagnosis: what we actually look for<\/a><\/li>\n      <li><a href=\"#fast-sintering\">Does fast sintering increase crack risk?<\/a><\/li>\n      <li><a href=\"#prevention\">How to reduce zirconia cracking in daily lab work<\/a><\/li>\n      <li><a href=\"#final-thought\">Final thought<\/a><\/li>\n      <li><a href=\"#references\">References<\/a><\/li>\n    <\/ol>\n  <\/div>\n\n<\/div>\n\n<article class=\"os_article\">\n\n<p id=\"intro\">Zirconia cracking after sintering isn\u2019t something you see every day. But when it does, it usually means one thing \u2014 the case is going back to remake.<\/p>\n\n<p>In most situations, it\u2019s not the zirconia block itself. The problem usually starts earlier, somewhere between design, milling, and sintering. The crack just shows up after firing.<\/p>\n\n<p>So before changing everything, it\u2019s worth stepping back and figuring out where things actually went wrong.<\/p>\n\n<h2 id=\"causes\">Common Causes of Zirconia Cracking After Sintering<\/h2>\n\n<div class=\"os_card\">\n  <h3>1. Uneven Thickness in Design<\/h3>\n\n  <p>This is probably the most common issue we see in the lab. If one area is thin and another is bulky, they don\u2019t shrink the same way during sintering. That difference builds internal stress, and the weak spot usually fails. When thickness varies too much, stress tends to build up during sintering<sup><a href=\"#ref-1\">[1]<\/a><\/sup>.<\/p>\n\n  <p>In real cases, cracks often show up in a few predictable areas:<\/p>\n  <ul>\n    <li>at connectors<\/li>\n    <li>along margins<\/li>\n    <li>near thin occlusal areas<\/li>\n  <\/ul>\n\n  <p>Sometimes it cracks during cooling, sometimes right after sintering. If the crack shows up in a predictable structural area, design is usually the first place to check.<\/p>\n\n  <p>Most guidelines suggest keeping wall thickness around 0.5\u20131.0 mm, depending on the indication.<\/p>\n\n  <div class=\"os_check\">\n    <strong>What we usually do:<\/strong>\n    <ul>\n      <li>Keep thickness as consistent as possible<\/li>\n      <li>Avoid sudden thick\u2013thin transitions<\/li>\n      <li>Reinforce connectors in bridges<\/li>\n      <li>Stay within minimum thickness, around 0.5\u20131.0 mm<\/li>\n    <\/ul>\n  <\/div>\n<\/div>\n\n<div class=\"os_card\">\n  <h3>2. Incorrect Sintering Temperature<\/h3>\n\n  <p>Sintering temperature does matter, but honestly, it\u2019s usually not the first thing we look at. If the furnace isn\u2019t stable, or the program is off, it can affect grain structure and how the material shrinks during firing<sup><a href=\"#ref-2\">[2]<\/a><\/sup>.<\/p>\n\n  <p>In practice, this tends to show up as:<\/p>\n  <ul>\n    <li>no clear crack pattern<\/li>\n    <li>strength feels inconsistent<\/li>\n    <li>multiple cases affected<\/li>\n  <\/ul>\n\n  <p>Because of that, temperature is usually something we check after design and milling have been ruled out.<\/p>\n\n  <div class=\"os_check\">\n    <strong>What to verify:<\/strong>\n    <ul>\n      <li>correct sintering curve, around 1450\u20131530\u00b0C depending on material<\/li>\n      <li>match program to zirconia type, such as 3Y \/ 4Y \/ 5Y<\/li>\n      <li>furnace calibration<\/li>\n    <\/ul>\n  <\/div>\n<\/div>\n\n<div class=\"os_card\">\n  <h3>3. Cooling Too Fast<\/h3>\n\n  <p>Problems with cooling usually come from trying to save time during the process. Zirconia doesn\u2019t like uneven cooling. If the outside cools faster than the inside, stress builds up.<\/p>\n\n  <p>We\u2019ve seen this happen in situations like:<\/p>\n  <ul>\n    <li>opening the furnace too early<\/li>\n    <li>taking restorations out while still hot<\/li>\n    <li>placing them on a cold surface immediately<\/li>\n  <\/ul>\n\n  <p>In real cases, cracks don\u2019t always appear immediately. They might appear:<\/p>\n  <ul>\n    <li>after sintering cycle is done<\/li>\n    <li>during handling<\/li>\n    <li>or even a few hours later<\/li>\n  <\/ul>\n\n  <p>If a case looked fine at first but cracked later, cooling is one of the first things worth checking. Cooling rate has a real impact on zirconia reliability. Faster cooling can introduce internal stress, especially in more translucent materials<sup><a href=\"#ref-3\">[3]<\/a><\/sup>.<\/p>\n\n  <div class=\"os_check\">\n    <strong>What usually works better:<\/strong>\n    <ul>\n      <li>letting restorations cool naturally inside the furnace<\/li>\n      <li>avoiding opening the furnace above roughly 200\u2013300\u00b0C<\/li>\n    <\/ul>\n    <p>No big trick here, just don\u2019t rush this step.<\/p>\n  <\/div>\n<\/div>\n\n<div class=\"os_card\">\n  <h3>4. Contamination Before Sintering<\/h3>\n\n  <p>Easy to overlook, but it happens more often than people expect.<\/p>\n\n  <p>Pre-sintered zirconia can easily pick up contamination from things like:<\/p>\n  <ul>\n    <li>oil from hands<\/li>\n    <li>dust or powder in the lab<\/li>\n    <li>moisture in the environment<\/li>\n  <\/ul>\n\n  <p>Once that happens, it can affect how the material densifies during sintering<sup><a href=\"#ref-4\">[4]<\/a><\/sup>.<\/p>\n\n  <p>In real cases, you might see:<\/p>\n  <ul>\n    <li>cracks appear randomly<\/li>\n    <li>sometimes with discoloration<\/li>\n    <li>differences between cases in the same batch<\/li>\n  <\/ul>\n\n  <p>If failures feel random, think contamination.<\/p>\n\n  <div class=\"os_check\">\n    <strong>What we usually do:<\/strong>\n    <ul>\n      <li>handle with clean gloves<\/li>\n      <li>avoid touching critical surfaces<\/li>\n      <li>keep restorations clean and dry<\/li>\n      <li>don\u2019t leave them exposed on the bench<\/li>\n    <\/ul>\n  <\/div>\n<\/div>\n\n<div class=\"os_card\">\n  <h3>5. Milling-Induced Stress<\/h3>\n\n  <p>A lot of cracks actually start before sintering \u2014 you just don\u2019t see them yet. Worn burs or overly aggressive cutting can introduce small microcracks in pre-sintered zirconia. They\u2019re not visible at this stage, so everything looks fine right after milling.<\/p>\n\n  <p>After sintering, those small defects can open up and turn into visible cracks<sup><a href=\"#ref-5\">[5]<\/a><\/sup>. This is why some cases look fine after milling but fail after firing, without any obvious pattern.<\/p>\n\n  <p>If multiple cases start failing like this, milling is usually one of the first things worth checking.<\/p>\n\n  <div class=\"os_check\">\n    <strong>What we usually look at:<\/strong>\n    <ul>\n      <li>bur condition, often needs replacing sooner than expected<\/li>\n      <li>feed rate and spindle speed<\/li>\n      <li>whether the cutting path is too aggressive<\/li>\n    <\/ul>\n  <\/div>\n<\/div>\n\n<h2 id=\"troubleshoot\">How We Troubleshoot Zirconia Cracking in the Lab<\/h2>\n\n<div class=\"os_steps\">\n  <div class=\"os_step\">Step 1: Check where the crack appears<\/div>\n  <div class=\"os_step\">Step 2: Look at thickness consistency<\/div>\n  <div class=\"os_step\">Step 3: Review the sintering program<\/div>\n  <div class=\"os_step\">Step 4: Check how the case was cooled<\/div>\n  <div class=\"os_step\">Step 5: Look at milling condition<\/div>\n<\/div>\n\n<h2 id=\"diagnosis\">Quick Diagnosis: What We Actually Look For<\/h2>\n\n<p>If you&#8217;re trying to figure out where the problem comes from, start with this quick check.<\/p>\n\n<div class=\"os_diag\">\n  <div class=\"os_diag_head\">\n    <div>What you see<\/div>\n    <div>Most likely cause<\/div>\n    <div>Check first<\/div>\n  <\/div>\n\n  <div class=\"os_diag_row\">\n    <div class=\"os_diag_cell os_diag_symptom\">Crack at connector<\/div>\n    <div class=\"os_diag_cell os_diag_cause_wrap\">\n      <span class=\"os_diag_cause\">Design issue<\/span>\n    <\/div>\n    <div class=\"os_diag_cell os_diag_check\">\n      <strong>Check:<\/strong> connector size and thickness consistency\n    <\/div>\n  <\/div>\n\n  <div class=\"os_diag_row\">\n    <div class=\"os_diag_cell os_diag_symptom\">Cracks after cooling<\/div>\n    <div class=\"os_diag_cell os_diag_cause_wrap\">\n      <span class=\"os_diag_cause\">Cooling problem<\/span>\n    <\/div>\n    <div class=\"os_diag_cell os_diag_check\">\n      <strong>Check:<\/strong> cooling process and furnace opening timing\n    <\/div>\n  <\/div>\n\n  <div class=\"os_diag_row\">\n    <div class=\"os_diag_cell os_diag_symptom\">Random cracks<\/div>\n    <div class=\"os_diag_cell os_diag_cause_wrap\">\n      <span class=\"os_diag_cause\">Contamination<\/span>\n    <\/div>\n    <div class=\"os_diag_cell os_diag_check\">\n      <strong>Check:<\/strong> handling, dust, moisture\n    <\/div>\n  <\/div>\n\n  <div class=\"os_diag_row\">\n    <div class=\"os_diag_cell os_diag_symptom\">Cracks after milling<\/div>\n    <div class=\"os_diag_cell os_diag_cause_wrap\">\n      <span class=\"os_diag_cause\">Milling stress<\/span>\n    <\/div>\n    <div class=\"os_diag_cell os_diag_check\">\n      <strong>Check:<\/strong> bur wear, toolpath, cutting parameters\n    <\/div>\n  <\/div>\n<\/div>\n\n<h2 id=\"fast-sintering\">Does Fast Sintering Increase Crack Risk?<\/h2>\n\n<p>Not really. Fast sintering doesn\u2019t directly cause cracks. What it does is reduce your margin for error.<\/p>\n\n<p>If the workflow is stable, both fast and conventional sintering can work without issues. But if something is slightly off \u2014 thickness, temperature, or milling \u2014 fast sintering tends to expose those problems much faster.<\/p>\n\n<p>In other words, it doesn\u2019t create new issues, but it makes existing ones easier to see. That\u2019s why getting the earlier steps right becomes more important when using fast programs<sup><a href=\"#ref-6\">[6]<\/a><\/sup>. For a deeper comparison, see our guide on <a href=\"https:\/\/www.own-smile.com\/dental-knowledge\/fast-vs-conventional-zirconia-sintering\/\" target=\"_blank\" rel=\"noopener\" style=\"color:#1260a0;text-decoration:underline;\">fast sintering vs conventional sintering<\/a>.<\/p>\n\n<h2 id=\"prevention\">How to Reduce Zirconia Cracking in Daily Lab Work<\/h2>\n\n<p>From lab experience, it\u2019s rarely one big mistake. More often, it\u2019s small things adding up over time.<\/p>\n\n<div class=\"os_check\">\n  <strong>What usually makes the biggest difference:<\/strong>\n  <ul>\n    <li>keeping thickness consistent<\/li>\n    <li>reinforcing connectors where needed<\/li>\n    <li>not rushing the cooling stage<\/li>\n    <li>keeping zirconia clean before sintering<\/li>\n    <li>maintaining milling tools properly<\/li>\n    <li>using stable, well-tested sintering programs<\/li>\n  <\/ul>\n<\/div>\n\n<h2 id=\"final-thought\">Final Thought<\/h2>\n\n<p>In most cases, zirconia cracking comes from small issues across different steps. They build up quietly during the workflow and only show up after sintering. Once those are under control, failures drop noticeably and results become much more predictable.<\/p>\n\n<p>And in the lab, that kind of predictability is what everything really comes down to.<\/p>\n\n<h2 id=\"references\">References<\/h2>\n\n<ol class=\"os_refs\">\n  <li id=\"ref-1\">Nakamura, K., et al. (2015). Influence of thickness and cooling rate on the flexural strength of full-contour zirconia. <em>Dental Materials Journal<\/em>, 34(6), 882\u2013889.<\/li>\n  <li id=\"ref-2\">Stawarczyk, B., \u00d6zcan, M., Hallmann, L., et al. (2013). The effect of zirconia sintering temperature on flexural strength, grain size, and contrast ratio. <em>Clinical Oral Investigations<\/em>, 17(1), 269\u2013274.<\/li>\n  <li id=\"ref-3\">Kim, H. K., &#038; Kim, S. H. (2021). Effect of cooling rate during glazing on the mechanical and optical properties of monolithic zirconia with 3 mol% yttria content. <em>Materials<\/em>, 14(23), 7474.<\/li>\n  <li id=\"ref-4\">Okuda, Y., Noda, M., Tsuruki, J., &#038; Ban, S. (2013). Contamination of dental zirconia before final firing: Effects on mechanical properties. <em>Dental Materials Journal<\/em>, 32(6), 940\u2013946.<\/li>\n  <li id=\"ref-5\">Luthardt, H. O., et al. (2004). Machining effects on zirconia. <em>Journal of Dental Research<\/em>, 83(10), 800\u2013804.<\/li>\n  <li id=\"ref-6\">Stawarczyk, B., et al. (2023). Sintering strategies for dental zirconia ceramics: slow versus rapid? <em>Current Oral Health Reports<\/em>, 10, 22\u201330.<\/li>\n<\/ol>\n\n<\/article>\n\n<div class=\"os_author_block\" id=\"author\">\n\n  <div class=\"os_author_card\">\n    <div class=\"os_author_avatar\">AX<\/div>\n\n    <div class=\"os_author_info\">\n      <h4>Amanda Xie<\/h4>\n\n      <p>\n        Digital Marketing Manager at OwnSmile, based in Shenzhen, China.\n        She covers dental materials and product selection for dental professionals.\n      <\/p>\n\n      <a href=\"https:\/\/www.linkedin.com\/in\/amanda-xie-260964150\/\" target=\"_blank\" rel=\"noopener\">\n        Connect on LinkedIn \u2192\n      <\/a>\n\n      <div class=\"os_author_review\">\n        Technical review by\n        <a href=\"https:\/\/www.linkedin.com\/in\/eric-liu-ba680034a\/\" target=\"_blank\" rel=\"noopener\">\n          Eric Liu\n        <\/a>, CEO, Ownsmile.\n      <\/div>\n    <\/div>\n  <\/div>\n\n  <div class=\"os_disclaimer_bottom\" id=\"disclaimer\">\n    <strong>Disclaimer:<\/strong>\n    This content is for informational purposes only and does not constitute professional dental advice, diagnosis, or treatment. \n    Always consult a qualified dental professional for clinical decisions. Ownsmile manufactures zirconia blocks referenced in this article. \n    All clinical data and recommendations are based on independently published peer-reviewed research.\n  <\/div>\n\n<\/div>\n\n<script>\n(function(){\n  document.querySelectorAll('.os_toc a').forEach(function(link){\n    link.addEventListener('click', function(e){\n      var targetId = this.getAttribute('href').slice(1);\n      var target = document.getElementById(targetId);\n      if(target){\n        e.preventDefault();\n        target.scrollIntoView({behavior:'smooth', block:'start'});\n      }\n    });\n  });\n})();\n<\/script>\n<!-- ZIRCONIA CRACKING BLOG END -->\n","protected":false},"excerpt":{"rendered":"<p>AX Written by Amanda Xie, Digital Marketing Manager, Ownsmile LinkedIn \u00b7 Technical review by Eric Liu, CEO, Ownsmile \u00b7 Last Updated: May 2026 Disclosure: Ownsmile manufactures zirconia blocks. This article provides educational information based on published peer-reviewed research. All clinical data is independently sourced and cited. Table of contents Introduction Common causes of zirconia cracking [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":2108,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[101],"tags":[],"projects":[39],"fairs_location":[],"class_list":["post-2097","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dental-knowledge"],"_links":{"self":[{"href":"https:\/\/www.own-smile.com\/es\/wp-json\/wp\/v2\/posts\/2097","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.own-smile.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.own-smile.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.own-smile.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.own-smile.com\/es\/wp-json\/wp\/v2\/comments?post=2097"}],"version-history":[{"count":0,"href":"https:\/\/www.own-smile.com\/es\/wp-json\/wp\/v2\/posts\/2097\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.own-smile.com\/es\/wp-json\/wp\/v2\/media\/2108"}],"wp:attachment":[{"href":"https:\/\/www.own-smile.com\/es\/wp-json\/wp\/v2\/media?parent=2097"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.own-smile.com\/es\/wp-json\/wp\/v2\/categories?post=2097"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.own-smile.com\/es\/wp-json\/wp\/v2\/tags?post=2097"},{"taxonomy":"projects","embeddable":true,"href":"https:\/\/www.own-smile.com\/es\/wp-json\/wp\/v2\/projects?post=2097"},{"taxonomy":"fairs_location","embeddable":true,"href":"https:\/\/www.own-smile.com\/es\/wp-json\/wp\/v2\/fairs_location?post=2097"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}