研究目的
比较氢氧化钙作为根管内药物与抗菌光动力疗法(aPDT)对根尖周病变患牙中粪肠球菌和白色念珠菌的抗菌效果。
研究成果
光动力疗法(aPDT)与氢氧化钙治疗均能显著降低根尖周病变患牙中粪肠球菌和白色念珠菌的菌落计数,两种方法间无显著差异。采用二极管激光与亚甲蓝的光动力疗法可作为单次就诊治疗中氢氧化钙的合适替代方案,有望减少椅旁操作时间与复诊次数。
研究不足
该研究受限于样本量(20名患者)且仅关注粪肠球菌和白色念珠菌。微生物分析仅采用培养法而未结合PCR技术可能影响准确性。根管的复杂解剖结构仍可能导致难以触及的区域清洁不彻底。
1:实验设计与方法选择:
本项体内临床试验比较了两种抗菌干预措施(光动力疗法和氢氧化钙治疗)在既往根管治疗失败且存在根尖周病变患者中的效果。研究采用随机对照设计,在干预前后进行微生物采样。
2:样本选择与数据来源:
选取20例下颌单根前磨牙经初次根管治疗后2年仍存在根尖周病变的患者。纳入标准:一般健康状况良好、根尖周病变可见、无临床症状。排除标准:牙齿折裂、台阶形成、超填、根管偏移、根吸收或穿孔。
3:实验设备与材料清单:
半导体激光器(810nm,0.2W)、亚甲蓝(50mg/mL)、氢氧化钙糊剂、Protaper镍钛旋转器械、Gates Glidden钻、H锉手用器械、无菌纸尖、巯基乙酸盐溶液、次氯酸钠(2.5%)、生理盐水、选择性培养基(用于粪肠球菌的胆汁七叶苷叠氮琼脂、用于白色念珠菌的沙氏葡萄糖琼脂)。
4:2W)、亚甲蓝(50mg/mL)、氢氧化钙糊剂、Protaper镍钛旋转器械、Gates Glidden钻、H锉手用器械、无菌纸尖、巯基乙酸盐溶液、次氯酸钠(5%)、生理盐水、选择性培养基(用于粪肠球菌的胆汁七叶苷叠氮琼脂、用于白色念珠菌的沙氏葡萄糖琼脂)。 实验流程与操作步骤:
4. 实验流程与操作步骤:完成化学机械预备后采集初始微生物样本。第1组接受亚甲蓝涂抹联合激光照射的光动力治疗;第2组使用氢氧化钙糊剂处理1周。干预后采集最终微生物样本。样本经培养、系列稀释后计数菌落形成单位。
5:数据分析方法:
采用SPSS 18.0软件分析数据,以P<0.05为显著性水平,使用Mann-Whitney U检验和Wilcoxon符号秩检验进行统计分析。
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Apex locator
Rapex 5
VDW
Used to determine the working length of the root canal.
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Diode laser
810 nm
Dr. Smite, Lambda Scientifica
Used for photodynamic therapy to irradiate the root canal and activate the photosensitizer to produce antimicrobial effects.
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Protaper NiTi rotary instruments
F3
Dentsply Maillefer
Used for root canal preparation and finishing, and for collecting bacterial biofilm samples.
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Gates Glidden drills
#2 and #3
Dentsply Maillefer
Used to remove coronal gutta percha during endodontic re-treatment.
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H file hand instruments
Dentsply Maillefer
Used for root canal preparation and removal of remaining gutta percha.
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Vortex
VTX-3000L
Harmony
Used to mix samples in the microbiology laboratory for serial dilution and culturing.
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Sodium hypochlorite
2.5%
ChlorCid, Ultradent Products, Inc
Used as an irrigant during root canal preparation to disinfect the canal.
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Methylene blue
50 mg/mL
Used as a photosensitizer in photodynamic therapy to enhance antimicrobial effects when activated by laser.
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Calcium hydroxide paste
Used as an intracanal medicament to disinfect the root canal over a 1-week period.
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Sterile paper points
#30
Ariadent
Used to collect microbiological samples from the root canal before and after interventions.
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Bile esculin azide agar
Liofilchem
Used as a selective culture medium for Enterococcus faecalis in microbiological analysis.
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Sabouraud dextrose agar
Merck
Used as a selective culture medium for Candida albicans in microbiological analysis.
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Coltosol
Ariadent
Used for temporary restoration of access cavity after calcium hydroxide placement.
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Gutta percha
Ariadent
Used for root canal filling after disinfection procedures.
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AH26 sealer
Dentsply Maillefer
Used as a sealer in root canal filling with gutta percha.
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