JP7543026B2 - 歯科用硬化性組成物 - Google Patents
歯科用硬化性組成物 Download PDFInfo
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- JP7543026B2 JP7543026B2 JP2020137643A JP2020137643A JP7543026B2 JP 7543026 B2 JP7543026 B2 JP 7543026B2 JP 2020137643 A JP2020137643 A JP 2020137643A JP 2020137643 A JP2020137643 A JP 2020137643A JP 7543026 B2 JP7543026 B2 JP 7543026B2
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- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
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- GQIUQDDJKHLHTB-UHFFFAOYSA-N trichloro(ethenyl)silane Chemical compound Cl[Si](Cl)(Cl)C=C GQIUQDDJKHLHTB-UHFFFAOYSA-N 0.000 description 1
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- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- UIYCHXAGWOYNNA-UHFFFAOYSA-N vinyl sulfide Chemical group C=CSC=C UIYCHXAGWOYNNA-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
- Dental Preparations (AREA)
Description
[1]脂環式アミノ基(a)を含有する(メタ)アクリルアミド(A)、光重合開始剤(B)、及びヒンダードフェノール化合物(C)を含有し、
前記脂環式アミノ基(a)は、ヘテロ原子として環構造内に1個の窒素原子のみを有し、かつ、前記脂環式アミノ基(a)が有する窒素原子に(メタ)アクリロイル基が直接結合しており、
前記ヒンダードフェノール化合物(C)の含有量が、前記光重合開始剤(B)の含有量100質量部に対して0.1~200質量部である、歯科用硬化性組成物;
[2]前記ヒンダードフェノール化合物(C)が、下記一般式[I]で表される化合物及び/又は下記一般式[III]で表される化合物を含有する、[1]に記載の歯科用硬化性組成物;
[3]前記ヒンダードフェノール化合物(C)が、一般式[III]で表される化合物を含有する、[1]又は[2]に記載の歯科用硬化性組成物;
[4]厚さが2.0mm±0.2mmである硬化物の24時間後の応力保持率が、50%以上である、[1]~[3]のいずれかに記載の歯科用硬化性組成物;
[5](メタ)アクリルアミド(A)以外のα,β-不飽和二重結合基含有化合物(D)を含有する、[1]~[4]のいずれかに記載の歯科用硬化性組成物;
[6]前記(メタ)アクリルアミド(A)以外のα,β-不飽和二重結合基含有化合物(D)が、常圧換算沸点が250℃以上である、[5]に記載の歯科用硬化性組成物;
[7]前記(メタ)アクリルアミド(A)以外のα,β-不飽和二重結合基含有化合物(D)が、ウレタン化(メタ)アクリル化合物(D)-1を含有する、[5]又は[6]に記載の歯科用硬化性組成物;
[8]前記ウレタン化(メタ)アクリル化合物(D)-1が、1分子内に、ポリエステル、ポリカーボネート、ポリウレタン、及びポリエーテルからなる群より選ばれる少なくとも1種の構造、並びにウレタン結合を含有する(メタ)アクリレートである、[7]に記載の歯科用硬化性組成物;
[9]前記(メタ)アクリルアミド(A)以外のα,β-不飽和二重結合基含有化合物(D)が、ウレタン結合を有しない(メタ)アクリル酸エステル化合物(D)-2を含有する、[5]~[7]のいずれかに記載の歯科用硬化性組成物;
[10]ウレタン結合を有しない単官能性の(メタ)アクリル酸エステル化合物(D)-2-1を実質的に含有しない、[1]~[9]のいずれかに記載の歯科用硬化性組成物;
[11]前記光重合開始剤(B)が、(ビス)アシルホスフィンオキシド類である、[1]~[10]のいずれかに記載の歯科用硬化性組成物;
[12][1]~[11]のいずれかに記載の歯科用硬化性組成物の硬化物からなる、歯科用マウスピース。
[13][1]~[11]のいずれかに記載の歯科用硬化性組成物の硬化物からなる、義歯床材料;
[14][1]~[11]のいずれかに記載の歯科用硬化性組成物の硬化物からなる、睡眠障害治療材料;
[15][1]~[11]のいずれかに記載の歯科用硬化性組成物からなる、光造形用材料;
[16][1]~[11]のいずれかに記載の歯科用硬化性組成物を用いて、光学的立体造形法によって立体造形物を製造する方法。
本発明の歯科用硬化性組成物は、脂環式アミノ基(a)を含有する(メタ)アクリルアミド(A)(以下、単に「(メタ)アクリルアミド(A)」と称することがある)を含有し、前記脂環式アミノ基(a)は、ヘテロ原子として環構造内に1個の窒素原子のみを有し、かつ、前記脂環式アミノ基(a)が有する窒素原子に(メタ)アクリロイル基が直接結合しているものであることにより、光照射後の立体造形物の融点(Tm)又はガラス転移温度(Tg)が向上することから、内部凝集力の向上がさらに図られるため、応力保持性及び靭性の良好な立体造形物を形成することが可能となる。
本発明に用いられる光重合開始剤(B)としては、一般工業界で使用されている重合開始剤から選択して使用でき、中でも歯科用途に用いられる重合開始剤が好ましく用いられる。
本発明の歯科用硬化性組成物は、ヒンダードフェノール化合物(C)を含有する。ヒンダードフェノール化合物(C)は、本発明の歯科用硬化性組成物において、歯科用硬化性組成物の硬化物の着色及び保管後の変色を抑制するために用いられる。また、光重合開始剤(B)に対し、ヒンダードフェノール化合物(C)を特定の比率で配合することによって、(メタ)アクリルアミド(A)と組み合わせた際に、硬化物の応力保持性、耐水性、及び靭性にも優れる。
本発明の歯科用硬化性組成物は、(メタ)アクリルアミド(A)以外のα,β-不飽和二重結合基含有化合物(D)(以下、単に「α,β-不飽和二重結合基含有化合物(D)」と称することがある)を含有することが好ましい。α,β-不飽和二重結合基含有化合物(D)は、本発明の歯科用硬化性組成物において、歯科用硬化性組成物の硬化物の曲げ弾性率を調製するために用いられる。また、本発明の歯科用硬化性組成物は、α,β-不飽和二重結合基含有化合物(D)を含むことで、硬化物の靭性及び耐水性により優れる。
PRAA:N-アクリロイルピロリジン(Merch KGaA社製、分子量125)
PPAA:N-アクリロイルピペリジン(Merch KGaA社製、分子量139)
TPO:2,4,6-トリメチルベンゾイルジフェニルホスフィンオキシド
BAPO:ビス(2,4,6-トリメチルベンゾイル)フェニルホスフィンオキシド
BHT:3,5-ジ-t-ブチル-4-ヒドロキシトルエン
PETBHPP:ペンタエリスリトールテトラキス[3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオネート]
[ウレタン化(メタ)アクリル化合物(D)-1]
後述の合成例1及び2により製造したウレタン化(メタ)アクリル化合物(D)-1-1及び(D)-1-2を用いた。
POBA:m-フェノキシベンジルメタクリレート(共栄社化学株式会社製、常圧換算沸点300℃以上)
TCDDMA:トリシクロデカンジメタノールジメタクリレート(共栄社化学株式会社製、常圧換算沸点300℃以上)
(1)撹拌機、温度調節器、温度計及び凝縮器を備えた内容積5Lの四つ口フラスコに、イソホロンジイソシアネート250g、及びジラウリル酸ジ-n-ブチルスズ0.15gを添加して、撹拌下に70℃に加熱した。
(2)一方、ポリエステルポリオール(株式会社クラレ製「クラレポリオール(登録商標) P-2030」;イソフタル酸と3-メチル-1,5-ペンタンジオールからなるポリオール、重量平均分子量Mw2000)2500gを側管付きの滴下漏斗に添加し、この滴下漏斗の液を、上記(1)のフラスコ中に滴下した。なお、上記(1)のフラスコ中の溶液を撹拌しつつ、フラスコの内温を65~75℃に保持しながら4時間かけて等速で滴下した。さらに、滴下終了後、同温度で2時間撹拌して反応させた。
(3)次いで、別の滴下漏斗に添加した2-ヒドロキシエチルアクリレート150gとヒドロキノンモノメチルエーテル0.4gとを均一に溶解させた液をフラスコの内温を55~65℃に保持しながら2時間かけて等速で滴下した後、フラスコ内の溶液の温度を70~80℃に保持しながら4時間反応させることにより、ウレタン化(メタ)アクリル化合物(D)-1-1を得た。GPC分析によるウレタン化(メタ)アクリル化合物(D)-1-1の重量平均分子量Mwは2700、常圧換算沸点は300℃以上であった。
(1)撹拌機、温度調節器、温度計及び凝縮器を備えた内容積5Lの四つ口フラスコに、イソホロンジイソシアネート250g、及びジラウリル酸ジ-n-ブチルスズ0.15gを添加して、撹拌下に70℃に加熱した。
(2)一方、ポリエステルポリオール(株式会社クラレ製「クラレポリオール(登録商標) P-2050」;セバシン酸と3-メチル-1,5-ペンタンジオールからなるポリオール、重量平均分子量Mw2000)2500gを側管付きの滴下漏斗に添加し、この滴下漏斗の液を、上記(1)のフラスコ中に滴下した。なお、上記(1)のフラスコ中の溶液を撹拌しつつ、フラスコの内温を65~75℃に保持しながら4時間かけて等速で滴下した。さらに、滴下終了後、同温度で2時間撹拌して反応させた。
(3)次いで、別の滴下漏斗に添加した2-ヒドロキシエチルアクリレート150gとヒドロキノンモノメチルエーテル0.4gとを均一に溶解させた液をフラスコの内温を55~65℃に保持しながら2時間かけて等速で滴下した後、フラスコ内の溶液の温度を70~80℃に保持しながら4時間反応させることにより、ウレタン化(メタ)アクリル化合物(D)-1-2を得た。GPC分析によるウレタン化(メタ)アクリル化合物(D)-1-2の重量平均分子量Mwは2600、常圧換算沸点は300℃以上であった。
表1及び表2に示す分量で各成分を常温(20℃±15℃、JIS(日本工業規格) Z 8703:1983)下で混合して、実施例1~7及び比較例1~8に係る歯科用硬化性組成物としてのペーストを調製した。
各実施例及び各比較例に係る歯科用硬化性組成物について、10人のパネラーで臭気を評価した(n=1)。10人のパネラーのうち、不快な臭気を感じた人が2人未満であったものを「○」、不快な臭気を感じた人が2人以上5人未満であったものを「△」、不快な臭気を感じた人が5人以上であったものを「×」とした。「○」を臭気について合格とした。
各実施例及び各比較例に係る歯科用硬化性組成物について、光造形機(DWS社製 DIGITALWAX(登録商標) 020D)を用いて、厚さ3.3mm×幅10.0mm×長さ64mmの試験片の造形を行った(n=5)。寸法通りの直方体が造形可能であった場合を造形可能「○」とし、1回でも立体造形物が得られなかった場合を造形不可「×」とした。なお、造形された試験片を用いて後述の評価を行った。
各実施例及び各比較例に係る歯科用硬化性組成物の硬化物について、光造形機(DWS社製 DIGITALWAX(登録商標) 020D)を用いて、長さ60mm、幅20mm、厚さ1.0mmのシート状の硬化物を作製した。硬化で得られた造形物を、エタノールで洗浄し、未重合の重合性単量体を除去した後、光照射機(EnvisionTEC社製 Otoflash(登録商標)G171)を用いてさらに重合し、JIS K 6251:2010(加硫ゴム及び熱可塑性ゴム-引張特性の求め方)に記載されるダンベル状8号形(平行部分の厚さ:2.0mm、平行部分の最大厚さ:2.5mm)の打抜き刃形で打ち抜き、引張試験片を作製した(n=5)。得られた試験片を用いて、応力保持性を評価した。具体的には、万能試験機(株式会社島津製作所製、EZ Test EZ-SX 500N)を用いて、治具間距離10mmでクロスヘッドスピード20mm/minで0.5mm引張った後、そのまま24時間保持し、応力(所定伸び引張応力)の減衰挙動を観察し、以下の式で算出した。平均値を表1、2に示す。初期の応力は0.5mm引張った直後の測定値を意味する。この試験で、初期の応力に対する24時間後の応力が、50%以上であることが好ましく、55%以上であることがより好ましく、60%以上であることがさらに好ましい。
応力保持率(%)=24時間後の応力/初期の応力×100
各実施例及び各比較例に係る歯科用硬化性組成物の硬化物につい、光造形機(DWS社製 DIGITALWAX(登録商標) 020D)を用いて、JIS T 6501:2012(義歯床用アクリル系レジン)に記載されている長さ64.0mm、幅10.0mm、厚さ3.3mmの試験片を作製した。得られた造形物を、エタノールで洗浄し、未重合の重合性単量体を除去した後、光照射機(EnvisionTEC社製 Otoflash(登録商標)G171)を用いてさらに重合し硬化物を得た。得られた硬化物を空気中で1日保管後、曲げ強さ試験を行って評価し、これを初期値とした。すなわち、万能試験機(株式会社島津製作所製、オートグラフAG-I 100kN)を用いて、クロスヘッドスピード5mm/minで曲げ強さ試験を実施した(n=5)。測定結果の平均値を表1、2に示す。試験片の曲げ弾性率としては、0.4~3.0GPaの範囲が好ましく、0.6~2.5GPaの範囲がより好ましく、0.8~2.0GPaの範囲がさらに好ましい。曲げ強さ(3点曲げ強さ)としては、30MPa以上が好ましく、40MPa以上がより好ましく、50MPa以上がさらに好ましい。破断点変位としては、破断しないことが好ましい。最後まで破断しない、又は変位20mm以上で破断した場合を柔軟性が良好「○」とし、変位10mm超20mm未満で破断した場合を柔軟性が中程度「△」とし、変位10mm以下で破断した場合を柔軟性が悪い「×」とした。靭性としては、破断点変位の評価が「△」又は「○」であり、曲げ弾性率が0.4~3.0GPaの範囲であり、かつ曲げ強さが30MPa以上であるものを合格とした。
靭性の測定で作製した硬化物と同様にして作製した、各実施例及び各比較例に係る歯科用硬化性組成物の硬化物について、37℃水中浸漬168時間後、上記曲げ強さ試験と同様に、曲げ強さを測定した(n=5)。上記靭性における曲げ強さの測定結果を初期の曲げ強さとし、初期の曲げ強さに対する、37℃水中浸漬168時間後の曲げ強さの変化率(低下率)を以下の式で算出した。算出した値の平均値を表1、2に示す。低下率が10%以下であれば耐水性に優れ、7%以下であればより耐水性に優れる。37℃水中浸漬168時間後の曲げ強さを表1、2では、「浸漬後の曲げ強さ」として示す。
曲げ強さの変化率(低下率)(%)=〔{初期の曲げ強さ(MPa)-37℃水中浸漬168時間後の曲げ強さ(MPa)}/初期の曲げ強さ(MPa)〕×100
各実施例及び比較例の歯科用硬化性組成物について、上記と同様の光造形機を用いて、直径15.0mm×厚さ1.0mmのディスク状の造形物を作製した。得られた造形物を、エタノールで洗浄し、未重合の重合性単量体を除去した後、光照射機(EnvisionTEC社製 Otoflash(登録商標)G171)を用いて追い込み重合し、硬化物を得た。得られた硬化物をシリコンカーバイド紙1000番で研磨し、続いて歯科用ラッピングフィルム(3M社製)で研磨した後、分光測色計(コニカミノルタ株式会社製、SPECTROPHOTOMETER CM-3610A、JIS Z 8722:2009、条件cに準拠、D65光源)を用いて、黄色度b*値、及び黄変度Δb*値を測定し、平均値を得た(n=5)。前記平均値を表1、2に示す。また、黄変度Δb*値は以下の式で定義される。
Δb*=b* (7d)-b* (0d)
(式中、b* (7d)は造形及び二次重合後7日後に測定されるJIS Z 8781-4:2013のL*a*b*表色系における黄色度b*値の平均値を表し、b* (0d)は造形及び二次重合直後に測定されるL*a*b*表色系における黄色度b*値の平均値を表す。)
該黄色度b*値が10.0以下である場合、歯科用補綴物を作製した場合に目視で無色と認識されやすい。また、該黄変度Δb*値が5.0以下である場合、歯科用補綴物を作製した場合に目視で黄変がないと認識されやすい。
Claims (14)
- 脂環式アミノ基(a)を含有する(メタ)アクリルアミド(A)、光重合開始剤(B)、及びヒンダードフェノール化合物(C)を含有し、
前記脂環式アミノ基(a)は、ヘテロ原子として環構造内に1個の窒素原子のみを有し、かつ、前記脂環式アミノ基(a)が有する窒素原子に(メタ)アクリロイル基が直接結合しており、
前記脂環式アミノ基(a)の環構造を形成している炭化水素鎖の炭素数が、4~5であり、
前記光重合開始剤(B)が、(ビス)アシルホスフィンオキシド類を含み、
前記ヒンダードフェノール化合物(C)が、下記一般式[I]で表される化合物及び/又は下記一般式[III]で表される化合物を含有し、
前記ヒンダードフェノール化合物(C)の含有量が、前記光重合開始剤(B)の含有量100質量部に対して0.1~200質量部である、歯科用硬化性組成物。
- 前記ヒンダードフェノール化合物(C)が、一般式[III]で表される化合物を含有する、請求項1に記載の歯科用硬化性組成物。
- 厚さが2.0mm±0.2mmである硬化物の24時間後の応力保持率が、50%以上である、請求項1又は2に記載の歯科用硬化性組成物。
- (メタ)アクリルアミド(A)以外のα,β-不飽和二重結合基含有化合物(D)を含有する、請求項1~3のいずれか1項に記載の歯科用硬化性組成物。
- 前記(メタ)アクリルアミド(A)以外のα,β-不飽和二重結合基含有化合物(D)が、常圧換算沸点が250℃以上である、請求項4に記載の歯科用硬化性組成物。
- 前記(メタ)アクリルアミド(A)以外のα,β-不飽和二重結合基含有化合物(D)が、ウレタン化(メタ)アクリル化合物(D)-1を含有する、請求項4又は5に記載の歯科用硬化性組成物。
- 前記ウレタン化(メタ)アクリル化合物(D)-1が、1分子内に、ポリエステル、ポリカーボネート、ポリウレタン、及びポリエーテルからなる群より選ばれる少なくとも1種の構造、並びにウレタン結合を含有する(メタ)アクリレートである、請求項6に記載の歯科用硬化性組成物。
- 前記(メタ)アクリルアミド(A)以外のα,β-不飽和二重結合基含有化合物(D)が、ウレタン結合を有しない(メタ)アクリル酸エステル化合物(D)-2を含有する、請求項4~6のいずれか1項に記載の歯科用硬化性組成物。
- ウレタン結合を有しない単官能性の(メタ)アクリル酸エステル化合物(D)-2-1を実質的に含有しない、請求項1~8のいずれか1項に記載の歯科用硬化性組成物。
- 請求項1~9のいずれか1項に記載の歯科用硬化性組成物の硬化物からなる、歯科用マウスピース。
- 請求項1~9のいずれか1項に記載の歯科用硬化性組成物の硬化物からなる、義歯床材料。
- 請求項1~9のいずれか1項に記載の歯科用硬化性組成物の硬化物からなる、睡眠障害治療材料。
- 請求項1~9のいずれか1項に記載の歯科用硬化性組成物からなる、光造形用材料。
- 請求項1~9のいずれか1項に記載の歯科用硬化性組成物を用いて、光学的立体造形法によって立体造形物を製造する方法。
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