JP6711540B2 - 口腔用組成物 - Google Patents
口腔用組成物 Download PDFInfo
- Publication number
- JP6711540B2 JP6711540B2 JP2016073118A JP2016073118A JP6711540B2 JP 6711540 B2 JP6711540 B2 JP 6711540B2 JP 2016073118 A JP2016073118 A JP 2016073118A JP 2016073118 A JP2016073118 A JP 2016073118A JP 6711540 B2 JP6711540 B2 JP 6711540B2
- Authority
- JP
- Japan
- Prior art keywords
- oral composition
- calcium phosphate
- oral
- composition
- present
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 67
- 239000001506 calcium phosphate Substances 0.000 claims description 60
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 60
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Landscapes
- Cosmetics (AREA)
Description
以上のことから、10μm未満の小さな粒子径のリン酸カルシウムを配合した口腔用組成物の性状が経時的に変化することなく、長期的に安定な状態を維持できる成分的な観点からの技術確立が大きな課題であった。
前記口腔用組成物において、リン酸カルシウム(A)の平均粒子径は10均粒未満であることが好ましい。
また、前期口腔用組成物において、リン酸カルシウム(A):5〜20wt%及び増粘性シリカ微粒子(B):3〜9wt%の範囲で配合されていることが好ましい。
さらに前記口腔用組成物において、リン酸カルシウム(A)がハイドロキシアパタイト、リン酸三カルシウムもしくはリン酸八カルシウムのいずれかであることが好ましい。
また、これらリン酸カルシウムは単独だけでなく、複数を組み合わせて用いることができる。これらのリン酸カルシウムの中でも、高い再石灰化誘導を期待する観点から、ハイドロキシアパタイト、リン酸三カルシウム、リン酸八カルシウムを用いることが好ましい。
なお、水に分散させた増粘性シリカ微粒子のpHを以下の方法によって確認することで、本発明の口腔用組成物として用いることができる増粘性シリカ微粒子か否かを判断することができる。
水48gと増粘性シリカ微粒子2gを混合後、超音波洗浄機を用いて5分間均一分散させて、pHメーターを用いてそのスラリーのpHを測定した時、そのpHが6〜11の範囲内でなければならない。
水48gに対して各種増粘性シリカ微粒子2gを超音波洗浄機「ウルトラソニッククリーナー SUC−110(松風製)」にて5分間分散させたスラリーのpHをpHメーターLAQUAtwinB−712(堀場製作所製)を用いて測定した。各種増粘性シリカ微粒子の種類及びpHの測定結果を表1に示す。
<保存安定性の評価>
調製したペースト状の口腔用組成物5gをPPフィルム上にφ20mm以内の円錐になるように乗せる。その上に、さらにフィルムと板とおもりを乗せ1分間放置する。この時、上に乗せるフィルムと板とおもりの総重量は100gとする。 1分間放置後、円状に広がった口腔用組成物の直径を5箇所計測し、その平均値をフロー値(初期値)とする。また、調製後、50℃2ヶ月間保存した口腔用組成物についても同様にフロー値(保存値)を測定する。初期値に対する保存値の変化率を求め、以下に示した3段階の基準により評価を行う。
初期値に対する保存後値の変化率が11%未満:○
初期値に対する保存後値の変化率が11~14%:△
初期値に対する保存後値の変化率が14%以上:×
<液分離の評価>
ラミネートチューブ(口径φ8mm)に充填した口腔用組成物(ペースト状)を練板紙に1cm押し出し、目視にて液分離の有無を確認し、以下に示した3段階の基準により評価を行う。
液分離が観察されない:○
表面にやや液浮きが観察される:△
液分離が観察される:×
<ペーストの押出性の評価>
ラミネートチューブ(口径φ8mm)に充填した口腔用組成物(ペースト状)を押し出す際の押し出し感を以下に示した3段階の基準により評価を行う。
自然に押し出せる場合:○
使用上問題ないがやや力がいる場合:△
強い力を入れてしか押し出せない場合:×
実施例1〜11の口腔用組成物はリン酸カルシウムと水に分散させた際のpHが6〜11を示す増粘性シリカ微粒子を組み合わせて配合したものであるため、いずれも保存安定性は良好であり、ペースト分離も無く、ペーストの押出感も非常に優れていた。
参考例12、15のように増粘性シリカ微粒子の配合量が2wt%と少ない場合、増粘性シリカ微粒子の沈降防止効果が乏しく、ペースト表面にやや液分離が発生していることが確認された。また、参考例13、14、16、17のように増粘性シリカ微粒子の配合量が10wt%を上回る場合、増粘効果が強く、ペーストの保存安定性及び押出性が若干低下し、上手く排出できないことが確認された。これらの参考例は既述のとおり、参考例1〜11と比較すると劣っていたが、使用上は問題ない範囲であった。
参考例18のようにリン酸カルシウムの配合量が4wt%と少ない場合は、組成中のフィラー成分の割合が不足してペースト表面にやや液分離が発生していることが確認された。また、参考例19のようにリン酸カルシウムの配合量が21wt%を上回る場合、ペーストの流動性が低下する影響により押出性が低下しペーストが排出しにくくなった。これらの参考例は既述のとおり、参考例1〜11と比較すると劣っていたが、使用上は問題ない範囲であった。
増粘性シリカ微粒子のpHが低い比較例1、3、5および比較例2、4、6は口腔用組成物の保存安定性が低下した。これは配合したリン酸カルシウムと増粘性シリカ微粒子が相互作用することで、徐々に粘性が増加した結果と考えられる。
Claims (2)
- 平均粒子径が10μm未満のリン酸カルシウム(A):5〜20wt%、水に分散させた際のpHが6〜11を示す増粘性シリカ微粒子(B):3〜9wt%、水(C)を含むことを特徴とする口腔用組成物。
- 請求項1の口腔用組成物において、リン酸カルシウム(A)がハイドロキシアパタイト、リン酸三カルシウムもしくはリン酸八カルシウムのいずれかであることを特徴とする口腔用組成物。
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