Cossellu Gianguido, Lanteri Valentina, Butera Andrea, Sarcina Michele, Farronato Giampietro
Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, Department of Biomedical, Surgical and Dental Sciences, Unit of Orthodontics and Pediatric Dentistry, School of Dentistry, University of MilanMilanItaly.
Department of Clinical, Surgical, Diagnostic and Pediatric Sciences, University of PaviaPaviaItaly.
Acta Biomater Odontol Scand. 2015 Apr 14;1(1):13-17. doi: 10.3109/23337931.2015.1021351. eCollection 2015 Jan.
: The aim of this study is to evaluate the effect of six different prophylactic agents on shear bond strength (SBS) of orthodontic brackets. : One hundred twenty-six freshly extracted mandibular bovine incisors were used. Teeth were randomly divided into 7 equal groups (18 per group) as follows: group-1 served as control with no pre-treatment; group-2 enamel treated with fluoride varnish (Fluor Protector, Ivoclar Vivadent); group-3 containing casein-phosphopeptide-amorphous calcium-phosphate (CPP-ACP) paste (GC Tooth Mousse, RECALDENT™); group-4 with ozone (HealOzone, Kavo; group-5 with glycine powder (Perio Flow, EMS); group-6 with hydroxyapatite powder 99.5% (Coswell S.p.A.); group-7 with a toothpaste made of hydroxyapatite nanocrystals (BioRepair® Plus, Coswell S.p.A). Brackets were all bonded using the same technique with transbond XT (3 M Unitek, Monrovia, CA). All the bonded specimens were stored for 24 h in deionized water (37 °C) and subjected to thermal cycling for 1000 cycles. The SBS was measured with an Instron Universal Testing machine and the adhesive remnant was assessed with the adhesive remnant index (ARI) using a stereomicroscope at 10× magnification. : Statistical differences (ANOVA) were found among the seven investigated groups ( = 12.226, 0.001). SBS of groups 2, 5 and 6 were significantly lower than the control group ( < 0.05). ARI scores (chi-square test) were correlated with the differences of SBS values. CPP-ACP paste, ozone or BioRepair® did not compromise on bracket bond strength. Fluoride, glycine or hydroxyapatite significantly decreased the SBS; only the fluoride group showed significant clinically low (<6 MPa) SBS values.
本研究的目的是评估六种不同预防剂对正畸托槽剪切粘结强度（SBS）的影响。使用了126颗新鲜拔除的下颌牛切牙。牙齿被随机分为7个相等的组（每组18颗），如下：第1组作为未进行预处理的对照组；第2组用氟化物清漆（氟保护漆，义获嘉伟瓦登特公司）处理牙釉质；第3组含有酪蛋白磷酸肽-无定形磷酸钙（CPP-ACP）糊剂（GC护齿泡沫，瑞尔登™）；第4组用臭氧处理（皓齿臭氧治疗仪，卡瓦公司）；第5组用甘氨酸粉末（牙周护理液，EMS公司）；第6组用99.5%的羟基磷灰石粉末（科斯韦尔股份公司）；第7组用由羟基磷灰石纳米晶体制成的牙膏（生物修复®加强型，科斯韦尔股份公司）。所有托槽均使用相同技术用Transbond XT（3M Unitek公司，加利福尼亚州蒙罗维亚）粘结。所有粘结标本在去离子水中（37℃）储存24小时，并进行1000次热循环。用英斯特朗万能试验机测量SBS，并使用立体显微镜在10倍放大倍数下用粘结剂残留指数（ARI）评估粘结剂残留情况。在七个研究组之间发现了统计学差异（方差分析，F = 12.226，P < 0.001）。第2、5和6组的SBS显著低于对照组（P < 0.05）。ARI评分（卡方检验）与SBS值的差异相关。CPP-ACP糊剂、臭氧或生物修复®对托槽粘结强度没有影响。氟化物、甘氨酸或羟基磷灰石显著降低了SBS；只有氟化物组显示出临床上显著较低（<6 MPa）的SBS值。
