{"id":8197,"date":"2025-04-27T07:26:41","date_gmt":"2025-04-27T07:26:41","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=8197"},"modified":"2026-04-28T10:42:53","modified_gmt":"2026-04-28T10:42:53","slug":"why-is-camphor-quinone-commonly-used-as-a-photosensitizer-in-light-curing-composite-resins","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/de\/why-is-camphor-quinone-commonly-used-as-a-photosensitizer-in-light-curing-composite-resins\/","title":{"rendered":"Warum wird Campherchinon h\u00e4ufig als Photosensibilisator in lichth\u00e4rtenden Kompositharzen verwendet?"},"content":{"rendered":"<p>Der weit verbreitete Einsatz von Campherchinon (CQ) als Photosensibilisator (Photoinitiator) in lichth\u00e4rtenden Kompositharzen (insbesondere Zahnrestaurationsmaterialien) steht haupts\u00e4chlich in engem Zusammenhang mit seinen einzigartigen chemischen Eigenschaften und Anwendungsvorteilen. Im Folgenden werden die spezifischen Gr\u00fcnde analysiert:<\/p>\n<p>1. Passende Wellenl\u00e4nge des sichtbaren Lichts, geeignet f\u00fcr die klinische Anwendung<br \/>\nAbsorptionseigenschaften:<br \/>\nDer Absorptionspeak von Campherchinon liegt im blauen Lichtbereich von 468 nm, der sehr gut mit dem blauen Licht (450-490 nm) \u00fcbereinstimmt, das von dentalen Lichth\u00e4rtungsger\u00e4ten (z. B. LED-Lichth\u00e4rtungslampen) abgegeben wird.<\/p>\n<p>Herk\u00f6mmliche UV-H\u00e4rtungsmittel (z. B. Benzoldiphenylether) erfordern zur Anregung ultraviolettes (UV) Licht, das jedoch f\u00fcr menschliches Gewebe sch\u00e4dlich ist, w\u00e4hrend blaues Licht f\u00fcr orale Eingriffe sicherer und durchdringend ist.<\/p>\n<p>Hohe Effizienz der Photoinitiation:<br \/>\nCQ absorbiert unter Blaulichtbestrahlung schnell Energie und erzeugt aktive freie Radikale (durch eine Wasserstoffeinfangreaktion oder einen synergistischen Effekt mit Aminbeschleunigern), die die Polymerisation von Harzmonomeren (z. B. Bis-GMA, UDMA) effizient einleiten.<\/p>\n<p>2. Gute Biokompatibilit\u00e4t und Sicherheit<br \/>\nGeringe Zytotoxizit\u00e4t:<br \/>\nKampferchinon selbst und seine Photolyseprodukte (z. B. Kampferderivate) haben eine geringe Toxizit\u00e4t und erf\u00fcllen die Biokompatibilit\u00e4tsnormen f\u00fcr Dentalmaterialien (z. B. ISO 10993).<\/p>\n<p>Im Vergleich zu anderen Fotoinitiatoren (z. B. TPO) weist CQ geringere R\u00fcckst\u00e4nde nach der Aush\u00e4rtung und eine bessere Langzeitsicherheit auf.<\/p>\n<p>Kein st\u00f6render Geruch:<br \/>\nCQ hat keinen offensichtlichen fl\u00fcchtigen oder irritierenden Geruch und eignet sich daher f\u00fcr die Verwendung in einer geschlossenen oralen Umgebung, um Unannehmlichkeiten f\u00fcr den Patienten zu vermeiden.<\/p>\n<p>3. Kompatibilit\u00e4t mit Harzsystemen<br \/>\nL\u00f6slichkeit und Stabilit\u00e4t:<br \/>\nCQ hat eine hohe L\u00f6slichkeit (ca. 0,1-1 Gew.-%) in der Harzmatrix (z.B. Methacrylatmonomere) und ist bei Raumtemperatur chemisch stabil, nicht leicht zu spontaner Polymerisation oder Abbau, was die Lagerdauer des Materials verl\u00e4ngert.<\/p>\n<p>Farbliche Anpassungsf\u00e4higkeit:<br \/>\nCQ selbst ist hellgelb, aber die Farbe hat nach dem Aush\u00e4rten des Harzes nur noch wenig Einfluss, was sich besonders f\u00fcr Zahnersatzmaterialien mit \u00e4sthetischen Anforderungen eignet (z. B. m\u00fcssen Kompositharze der nat\u00fcrlichen Zahnfarbe entsprechen).<\/p>\n<p>4. Synergie und Flexibilit\u00e4t bei der Formulierung<br \/>\nSynergie mit Aminbeschleunigern:<br \/>\nIn klinischen Formulierungen wird CQ h\u00e4ufig in Kombination mit terti\u00e4ren Aminbeschleunigern (wie DMABEE, 4-EDMAB) verwendet, um ein Redoxsystem zu bilden:<\/p>\n<p>Blaulichtanregung von CQ \u2192 Abspaltung von CQ aus den Aminwasserstoffatomen \u2192 Erzeugung freier Radikale \u2192 Ausl\u00f6sung der Harzpolymerisation.<\/p>\n<p>Diese synergetische Wirkung verbessert die Effizienz der Initiierung erheblich und erm\u00f6glicht eine schnelle Aush\u00e4rtung bei geringer Lichtintensit\u00e4t.<\/p>\n<p>Einstellbare Aush\u00e4rtungstiefe:<br \/>\nDurch Anpassung der CQ-Konzentration und der Lichtintensit\u00e4t kann die Aush\u00e4rtungstiefe des Harzes gesteuert werden (in der Regel 2 bis 4 mm), um der Forderung nach schichtweiser Aush\u00e4rtung von Zahnrestaurationen gerecht zu werden.<\/p>\n<p>5. Bew\u00e4hrte Technologie und regulatorische Unterst\u00fctzung<br \/>\n\u00dcberpr\u00fcfung historischer Anwendungen:<br \/>\nCQ wird seit den 1970er Jahren f\u00fcr Dentalkunststoffe verwendet. Es hat eine gro\u00dfe Menge an klinischen Daten angesammelt und seine Leistung und Sicherheit sind weithin anerkannt.<\/p>\n<p>Sowohl die American Dental Association (ADA) als auch die ISO-Normen empfehlen CQ als Hauptinitiator f\u00fcr lichth\u00e4rtende Harze.<\/p>\n<p>Beschr\u00e4nkungen der Alternativen:<br \/>\nAndere Initiatoren mit sichtbarem Licht (z. B. TPO, Ivocerin) weisen eine h\u00f6here Initiierungseffizienz auf, haben aber mit den folgenden Problemen zu k\u00e4mpfen:<\/p>\n<p>Farbinterferenzen (z. B. TPO ist gelb, was die \u00c4sthetik beeintr\u00e4chtigt);<\/p>\n<p>Umstrittene Toxizit\u00e4t (Metaboliten einiger neuer Initiatoren k\u00f6nnen potenzielle Risiken bergen);<\/p>\n<p>Kosten und Prozesskomplexit\u00e4t (Harzformulierungen und Anlagen m\u00fcssen angepasst werden).<\/p>\n<p><!-- lc-commercial-start --><\/p>\n<h2>A practical selection route for photoinitiator-related projects<\/h2>\n<p>When technical buyers or formulators screen photoinitiators, the most useful decision frame is usually cure quality plus application fit: which package cures reliably, keeps appearance acceptable, and still works under the lamp, film thickness, and substrate conditions of the actual process.<\/p>\n<ul>\n<li><strong>Match the package to the lamp first:<\/strong> mercury lamps, UV LEDs, and visible-light systems can rank the same photoinitiators very differently.<\/li>\n<li><strong>Check depth cure and surface cure separately:<\/strong> a film that feels dry on top can still be weak underneath.<\/li>\n<li><strong>Balance yellowing with reactivity:<\/strong> the strongest deep-cure route is not always the best commercial choice if color or migration risk becomes unacceptable.<\/li>\n<li><strong>Use the final formula as the benchmark:<\/strong> pigment load, monomer package, and film thickness can all change the apparent ranking of the same initiator.<\/li>\n<\/ul>\n<h3>Recommended product references<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-tpo-l-cas-84434-11-7\/\">CHLUMINIT TPO-L<\/a>:<\/strong> A strong low-yellowing reference for LED-oriented UV systems.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/de\/product\/cas-270586-78-2\/\">CHLUMINIT TMO<\/a>:<\/strong> A valuable comparison point when lower yellowing or TPO-replacement discussions matter.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-819-irgacure-819-cas-162881-26-7\/\">CHLUMINIT 819<\/a>:<\/strong> Useful when a formulation needs stronger absorption and deeper cure support.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/de\/product\/irgacure-1173-cas-7473-98-5\/\">CHLUMINIT 1173<\/a>:<\/strong> A practical comparison point for classic short-wave UV initiation.<\/li>\n<\/ul>\n<h3>FAQ for buyers and formulators<\/h3>\n<p><strong>Why are blended photoinitiator packages so common?<\/strong><br \/>Because one product may control yellowing or lamp fit well while another improves cure depth or line-speed performance, so the full package is often stronger than any single grade.<\/p>\n<p><strong>Should incomplete cure always be solved by adding more initiator?<\/strong><br \/>Not automatically. The real limitation may be the lamp, film thickness, pigment shading, or the rest of the reactive system rather than simple under-dosage.<\/p>\n<p><!-- lc-commercial-end --><\/p>\n<h2><strong><b>Kontaktieren Sie uns jetzt!<\/b><\/strong><\/h2>\n<p><!-- lc-qa-start --><\/p>\n<p><strong>Quick answer:<\/strong> For practical formulation work, photoinitiator screening starts with the light source and film build, then checks yellowing, adhesion, and cure completeness under real production conditions.<\/p>\n<p><!-- lc-qa-end --><\/p>\n<h4><strong><b>Wenn Sie einen Preis oder eine Probe ben\u00f6tigen, tragen Sie bitte Ihre Kontaktdaten in das unten stehende Formular ein. Wir werden uns in der Regel innerhalb von 24 Stunden mit Ihnen in Verbindung setzen. Sie k\u00f6nnen mir auch eine E-Mail schicken <a href=\"mailto:info@longchangchemical.com\"><span style=\"color: #00ccff;\">info@longchangchemical.com<\/span><\/a>\u00a0w\u00e4hrend der Gesch\u00e4ftszeiten ( 8:30 bis 18:00 Uhr UTC+8 Mo.~Sa. ) oder nutzen Sie den Live-Chat auf der Website, um eine schnelle Antwort zu erhalten.<\/b><\/strong><\/h4>\n<p>&nbsp;<\/p>\n<table style=\"border-collapse: collapse; width: 435.77pt;\" border=\"0\" width=\"581\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt; width: 215.25pt;\" width=\"287\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-tpo-cas-75980-60-8\/\"><span style=\"color: #00ccff;\">Fotoinitiator TPO<\/span><\/a><\/td>\n<td style=\"width: 220.50pt;\" width=\"294\">CAS 75980-60-8<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/cas-270586-78-2\/\"><span style=\"color: #00ccff;\">Fotoinitiator TMO<\/span><\/a><\/td>\n<td>CAS 270586-78-2<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-pd-01-cas-579-07-7\/\"><span style=\"color: #00ccff;\">Fotoinitiator PD-01<\/span><\/a><\/td>\n<td>CAS 579-07-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-pbz-cas-2128-93-0\/\"><span style=\"color: #00ccff;\">Photoinitiator PBZ<\/span><\/a><\/td>\n<td>CAS 2128-93-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-oxe-02-cas-478556-66-0\/\"><span style=\"color: #00ccff;\">Fotoinitiator OXE-02<\/span><\/a><\/td>\n<td>CAS 478556-66-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-ombb\/\"><span style=\"color: #00ccff;\">Photoinitiator OMBB<\/span><\/a><\/td>\n<td>CAS 606-28-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-mpbz-6012\/\"><span style=\"color: #00ccff;\">Photoinitiator MPBZ (6012)<\/span><\/a><\/td>\n<td>CAS 86428-83-3<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-mbp-cas-134-84-9\/\"><span style=\"color: #00ccff;\">Fotoinitiator MBP<\/span><\/a><\/td>\n<td>CAS-NR. 134-84-9<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-mbf-cas-15206-55-0\/\"><span style=\"color: #00ccff;\">Fotoinitiator MBF<\/span><\/a><\/td>\n<td>CAS 15206-55-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-lap-cas-85073-19-4\/\"><span style=\"color: #00ccff;\">Fotoinitiator LAP<\/span><\/a><\/td>\n<td>CAS 85073-19-4<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-itx-cas-5495-84-1\/\"><span style=\"color: #00ccff;\">Fotoinitiator ITX<\/span><\/a><\/td>\n<td>CAS 5495-84-1<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-emk\/\"><span style=\"color: #00ccff;\">Photoinitiator EMK<\/span><\/a><\/td>\n<td>CAS 90-93-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-eha-cas-21245-02-3\/\"><span style=\"color: #00ccff;\">Photoinitiator EHA<\/span><\/a><\/td>\n<td>CAS 21245-02-3<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-edb-cas-10287-53-3\/\"><span style=\"color: #00ccff;\">Fotoinitiator EDB<\/span><\/a><\/td>\n<td>CAS 10287-53-3<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-detx-cas-82799-44-8\/\"><span style=\"color: #00ccff;\">Fotoinitiator DETX<\/span><\/a><\/td>\n<td>CAS 82799-44-8<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-cq\/\"><span style=\"color: #00ccff;\">Photoinitiator CQ \/ Campherchinon<\/span><\/a><\/td>\n<td>CAS 10373-78-1<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-cbp-cas-134-85-0\/\"><span style=\"color: #00ccff;\">Fotoinitiator CBP<\/span><\/a><\/td>\n<td>CAS-NR. 134-85-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-bp-cas-119-61-9\/\"><span style=\"color: #00ccff;\">Photoinitiator BP \/ Benzophenon<\/span><\/a><\/td>\n<td>CAS 119-61-9<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-bms\/\"><span style=\"color: #00ccff;\">Fotoinitiator BMS<\/span><\/a><\/td>\n<td>CAS 83846-85-9<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-938\/\"><span style=\"color: #00ccff;\">Photoinitiator 938<\/span><\/a><\/td>\n<td>CAS 61358-25-6<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-937-cas-71786-70-4\/\"><span style=\"color: #00ccff;\">Photoinitiator 937<\/span><\/a><\/td>\n<td>CAS 71786-70-4<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-819-dw\/\"><span style=\"color: #00ccff;\">Fotoinitiator 819 DW<\/span><\/a><\/td>\n<td>CAS 162881-26-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-819-irgacure-819-cas-162881-26-7\/\"><span style=\"color: #00ccff;\">Photoinitiator 819<\/span><\/a><\/td>\n<td>CAS 162881-26-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-784-cas-125051-32-3\/\"><span style=\"color: #00ccff;\">Photoinitiator 784<\/span><\/a><\/td>\n<td>CAS 125051-32-3<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-754-cas-211510-16-6-442536-99-4\/\"><span style=\"color: #00ccff;\">Photoinitiator 754<\/span><\/a><\/td>\n<td>CAS 211510-16-6 442536-99-4<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-6993-cas-71449-78-0\/\"><span style=\"color: #00ccff;\">Photoinitiator 6993<\/span><\/a><\/td>\n<td>CAS 71449-78-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-6976\/\"><span style=\"color: #00ccff;\">Fotoinitiator 6976<\/span><\/a><\/td>\n<td>CAS 71449-78-0 89452-37-9 108-32-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-379-cas-119344-86-4\/\"><span style=\"color: #00ccff;\">Photoinitiator 379<\/span><\/a><\/td>\n<td>CAS 119344-86-4<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-369-cas-119313-12-1\/\"><span style=\"color: #00ccff;\">Photoinitiator 369<\/span><\/a><\/td>\n<td>CAS 119313-12-1<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><span style=\"color: #00ccff;\"><a style=\"color: #00ccff;\" href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-160\/\">Photoinitiator 160<\/a><\/span><\/td>\n<td>CAS 71868-15-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-1206\/\"><span style=\"color: #00ccff;\">Photoinitiator 1206<\/span><\/a><\/td>\n<td><\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/de\/product\/irgacure-1173-cas-7473-98-5\/\"><span style=\"color: #00ccff;\">Photoinitiator 1173<\/span><\/a><\/td>\n<td>CAS-NR. 7473-98-5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>The widespread use of camphorquinone (CQ) as a photosensitizer (photoinitiator) in light-curing composite resins (especially dental restorative materials) is mainly closely related to its unique chemical properties and application advantages.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[143],"tags":[],"class_list":["post-8197","post","type-post","status-publish","format-standard","hentry","category-uv-light-curing-series"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Why is camphor quinone commonly used as a photosensitizer in light-curing composite resins? - Longchang Chemical<\/title>\n<meta name=\"description\" content=\"The widespread use of camphorquinone (CQ) as a photosensitizer (photoinitiator) in light-curing composite resins (especially dental restorative material...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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