Abstract
Noncarious cervical lesions (NCCLs) are a common clinical finding often linked with dentin hypersensitivity (DH). Aim. The aim of the study was to evaluate the influence of diode laser for the treatment of DH on microleakage of subsequent NCCL restorations. Materials and Methods. Forty-eight extracted human premolars were collected. All teeth received standardized cervical preparation on both the buccal and palatal surfaces and were randomly divided into three groups (n = 16) according to the restorative material used: nanohybrid composite resin (CR), resin-modified glass ionomer (RMGI), and conventional glass ionomer (GIC). The prepared cavities on the palatal surfaces were treated by diode laser using SIROlaser Blue (Sirona Dental Systems, Bensheim, Germany) prior to restoration, while preparations on the buccal surfaces were directly restored. After thermocycling, the teeth were immersed in methylene blue dye for microleakage evaluation under 40x magnification at both occlusal and cervical margins. The Kruskal-Wallis test followed by the Bonferroni tests was conducted to determine inter- and intragroup differences (P < 0.05). Results. All restorative materials tested showed some degree of microleakage with no statistically significantly different scores with or without the use of laser desensitization prior to restorative treatment. Group CR showed the least microleakage, followed by group RMGI, while group GIC showed the highest. Cervical margins showed greater microleakage than the occlusal margins where the difference was statistically significant in the RMGI group without laser pretreatment (P = 0.006) and in both groups CR (P = 0.02) and RMGI (P = 0.006) with the laser pretreatment. Conclusion. Application of diode laser for the treatment of DH prior to the restoration of teeth with NCCL did not affect the microleakage of all the restorative materials tested. All the materials showed some degree of microleakage, which was higher in gingival margins compared to occlusal margins. The resin composite shows the least microleakage among all the tested materials.
Highlights
Noncarious cervical lesions (NCCLs) are defined as tooth structure loss at or near the cementoenamel junction of the teeth that is not associated with the presence of caries [1]
The increased awareness to preserve natural dentition has amplified the prevalence of NCCLs that are often associated with dentin hypersensitivity (DH)
Akarsu et al evaluated the effect of the diode laser used for dentin sensitivity on the clinical success of NCCLs restorations, restored with different adhesive systems [21]. They concluded that diode laser application, prior to the restoration of teeth with NCCL, has reduced hypersensitivity without affecting their retention rates. This finding needed to be confirmed by laboratory investigations; the aim of our study was to evaluate the influence of diode laser, used in treatment of dentin hypersensitivity on microleakage of NCCL restorations restored with different materials
Summary
Noncarious cervical lesions (NCCLs) are defined as tooth structure loss at or near the cementoenamel junction of the teeth that is not associated with the presence of caries [1]. The etiology of NCCLs is considered multifactorial, where the lesions result from the interaction of different mechanisms including biocorrosion, mechanical stress, and friction [2]. The prevalence of these lesions is variable, reaching as high as 85% as reported by certain studies, and was shown to be closely associated with people’s lifestyles [3]. Parafunctional habits, inadequate tooth brushing, high acidic beverage intake [2], and even certain athletic activities are considered among the risk factors [1]. Maxillary posterior teeth especially premolars are the most susceptible teeth [4, 5] possibly due to their smaller crown size and their location in the dental arch, exposing them to excessive lateral forces during mandible excursive movements leading to amplified deformations at the cervical areas [6, 7].
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