Comparative Evaluation of Shear Bond Strength of Four Different Light Cure Orthodontic Adhesives used in Fixed Appliance Therapy: An In vivo study

Anu Bharathy, M (2020) Comparative Evaluation of Shear Bond Strength of Four Different Light Cure Orthodontic Adhesives used in Fixed Appliance Therapy: An In vivo study. Masters thesis, Adhiparasakthi Dental College and Hospital, Melmaruvathur.


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INTRODUCTION: Bond strength is an important criteria that determines the amount of force delivered and treatment duration in Orthodontics. Many adhesive systems are available but we need to select the most efficient one with desired bond strength and a system that reduces the chair side time. OBJECTIVES: 1. To determine and compare the shear bond strength of four different adhesive systems. 2. To compare between single and two component adhesive systems. 3. To evaluate the site of bond failure. METHODS: 15 patients reporting to the department of orthodontics, APDC&H, with Angles class I malocclusion bimaxillary protrusion and satisfying the inclusion criteria were included in the study.Oral prophylaxis will be done with polishing.Brackets(MBT 0.022 ORMCO mini series) were bonded to the test samples 14, 24,34 and 44 with Orthofix(regular adhesive-dual component), Heliosit, Fix and Orthofix on a same day randomly in an unbiased manner.Patients were instructed to maintain meticulous oral hygiene. Post bonding instructions were given. As we are performing in vivo study,the therapeutic extraction of all first premolars will be done. On 28th day extraction of 14 and 44 will be done and specimens were collected in a saline. They were sent to the laboratory for the evaluation of Bond Strength, Adhesive Remnent Index as early as possible to avoid any bias.On 30th day, extraction of 24 and 34 will be done and the abovesaid procedure was repeated. Total samples extracted from the patients were 60. Group 1: Premolars bonded with regular dual component adhesive (Orthofix). Group 2: Premolars bonded with Heliosit. Group 3: Premolars bonded with fix. Group 4: Premolars bonded with Orthofix SPS (single paste system). All the groups were sent in the separate container to the laboratory labelling only the groups. The specimens were mounted in metallic ring with acrylic. An Instron universal testing machine was used to apply a shear force directly to the enamel bracket- interface. A computer connected to the machine recorded the results of each test in Mpa. The Adhesive Remnant Index (ARI) was used to describe the quantity of resin remaining on the tooth surface. Results: The mean shear bond strength and standard deviation for the groups were statistically significant among the groups Group1: 13.44 ± 2.2Mpa, Group 2: 9.74 ±1.5Mpa, Group 3: 10.54± 2.7Mpa and Group 4: 12.67± 1.9Mpa. CONCLUSION: All the four adhesive systems has acceptable bond strength of about 8 Mpa. Based upon the results achieved Orthofix Regular has highest bond strength followed by Orthofix SPS, Fix, Heliosit respectively. So appropriate selection of adhesive systems should be done based on particular clinical condition.

Item Type: Thesis (Masters)
Additional Information: 241719451
Uncontrolled Keywords: Shear bond strength, acid etching Instron Machine.
Subjects: DENTAL > Orthodontics and Dentofacial Orthopedics
Depositing User: Subramani R
Date Deposited: 24 Feb 2021 03:42
Last Modified: 24 Feb 2021 03:42

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