Lenin Amritha, Anbarasu Prema, Kumar S Saravana, Narayanan Arun, Dhingra Richa, Ramesh Bharath
Department of Orthodontics and Dentofacial Orthopedics, Chettinad Dental College & Research Institute, Chengalpattu, Tamil Nadu, India.
Department of Orthodontics and Dentofacial Orthopedics, Government Dental College & Hospital, Pudukkottai, Tamil Nadu, India.
Int J Clin Pediatr Dent. 2024 Sep;17(9):999-1003. doi: 10.5005/jp-journals-10005-2921.
The study explores the impact of microleakage on bracket (metal/ceramic) debonding and the occurrence of white spot lesions during orthodontic treatment. Various curing techniques are employed to assess shear bond strength (SBS) and microleakage in both metal and ceramic brackets.
A total of 120 samples were divided into six groups, each consisting of 20 samples. The groups were categorized based on the bracket material (metal or ceramic) and further subdivided according to the light-emitting diode (LED) curing method (traditional, transillumination, or combination). Fifty percent (60 samples) of each group were allocated for SBS evaluation, while the remaining 50% (60 samples) were used for microleakage assessment. The buccal enamel surfaces of all teeth in the six groups were etched and coated with a uniform layer of sealant. Stainless steel and ceramic maxillary premolar brackets were affixed using Transbond XT adhesive and light-cured with an LED unit. SBS was measured using the Instron ElectroPuls E3000 universal testing machine, and microleakage was examined using a stereomicroscope.
One-way analysis of variance (ANOVA) with Bonferroni test revealed significant differences in SBS among the six groups. Group IV exhibited the minimum SBS mean (7.02 MPa), while group VI displayed the maximum SBS mean (21.73 MPa). Microleakage assessment demonstrated that group IV had a maximum depth of 0.26 mm using the transillumination method, whereas group VI showed a minimum depth of 0.14 mm with the combination technique.
Brackets cured with a combination of conventional (5 seconds) and transillumination (5 seconds per bracket) methods exhibited significantly higher SBS. Conversely, group IV, cured solely with the transillumination technique (10 seconds per bracket), demonstrated the lowest strength. In terms of microleakage, group VI, treated with the combination technique, displayed the shallowest depth, while group IV, cured exclusively with transillumination, showed the greatest depth of microleakage. These findings underscore the importance of the curing method in influencing both SBS and microleakage, offering valuable insights for optimizing orthodontic bracket placement techniques.
Lenin A, Anbarasu P, S SK, Comparison of Microleakage and Bond Strength in Metal and Ceramic Brackets Cured by Conventional and Transillumination Methods: An Evaluation. Int J Clin Pediatr Dent 2024;17(9):999-1003.
本研究探讨微渗漏对正畸治疗期间托槽（金属/陶瓷）脱粘及白斑病变发生的影响。采用多种固化技术评估金属和陶瓷托槽的剪切粘结强度（SBS）和微渗漏情况。
总共120个样本分为六组，每组20个样本。这些组根据托槽材料（金属或陶瓷）分类，并根据发光二极管（LED）固化方法（传统、透照或联合）进一步细分。每组的50%（60个样本）用于SBS评估，其余50%（60个样本）用于微渗漏评估。对六组中所有牙齿的颊侧釉质表面进行酸蚀并涂覆均匀的一层封闭剂。使用Transbond XT粘合剂粘贴不锈钢和陶瓷上颌前磨牙托槽，并用LED装置进行光固化。使用Instron ElectroPuls E3000万能试验机测量SBS，并使用体视显微镜检查微渗漏情况。
采用Bonferroni检验的单因素方差分析（ANOVA）显示六组之间的SBS存在显著差异。第四组的SBS均值最低（7.02MPa），而第六组的SBS均值最高（21.73MPa）。微渗漏评估表明，第四组采用透照法时最大深度为0.26mm，而第六组采用联合技术时最小深度为0.14mm。
采用传统（5秒）和透照（每个托槽5秒）相结合方法固化的托槽表现出显著更高的SBS。相反，仅采用透照技术（每个托槽10秒）固化的第四组强度最低。在微渗漏方面，采用联合技术处理的第六组深度最浅，而仅采用透照固化的第四组微渗漏深度最大。这些发现强调了固化方法对SBS和微渗漏的影响，为优化正畸托槽放置技术提供了有价值的见解。
Lenin A, Anbarasu P, S SK, 传统与透照方法固化金属和陶瓷托槽的微渗漏与粘结强度比较：一项评估。《国际临床儿科牙科学杂志》2024；17(9):999 - 1003。
