The effect of polymerization and preparation techniques on the microleakage of composite laminate veneers

Abstract

Background:Marginal leakage is the important factor influencing the maintenance of dental esthetic.Aim:The purpose of this study was to evaluate the relationship between the preparation techniques and type of polymerization techniques on microleakage of composite laminate veneers.Materials and Methods:Ninety-one same sized, caries-free human maxillary central incisors were randomly assigned to 13 groups (n = 7) and were designed with four different preparation techniques (window type, feather type, bevel type, and incisal overlap type). One group determined as control group and any preparation was applied. Nanohybrid resin composite was used for restoration. Composite laminate veneers polymerized with three different techniques (direct light curing, indirect polymerization with a combination of pressure, light and heat using a light cup and heat cup, direct polymerization, and additionally heat cured in an oven). The specimens were thermocycled, and then immersed in 5% basic fuchsine solution. Following 24 h, all specimens were immersed in 65% nitric acid solutions for volumetric dye extraction test. Samples diluted with distilled water and centrifuged and microleakage determined by a spectrophotometer.Statistical Analysis Used:Data were analyzed with two-way ANOVA and Tukey honest significant difference post hoc multiple comparisons test (P < 0.05).Results:For comparing the microleakage value of preparation and polymerization techniques, Window type preparation showed a significant difference in direct polymerization + additional cured group (P < 0.05). Control group was statistically different from the other groups (P < 0.05).Conclusions:Window type laminate preparation can be preferred in indirect polymerization technique because it caused less leakage in this present study.

Minimally invasive approach to diastema closure using lithium disilicate porcelain veneers: clinical report

“…However, the prevention of micro infiltrations is a very important factor for the longevity of the restoration. An in vitro study by Celik et al [12] showed that preparation and polymerization techniques have demonstrated different effects on microleakage in ceramic laminates. Restorations that involve problems in sealing margins can allow for bacterial penetration and as a result may cause marginal staining, postoperative sensitivity, and recurrent caries.…”

“…Restorations that involve problems in sealing margins can allow for bacterial penetration and as a result may cause marginal staining, postoperative sensitivity, and recurrent caries. [12] Considering the various factors involved in the longevity of ceramics, studies have shown that patients who have good hygiene and yearly followup have an excellent rate of indirect restoration permanence. According to Olley et al [13], in a follow-up of 50 years of clinical cases, the survival rate of indirect restorations in anterior teeth made in feldspathic ceramics is better than in posterior teeth (95%).…”

Noninvasive Temperature Measurement in Dental Materials Using Nd3+, Yb3+ Doped Nanoparticles Emitting in the Near Infrared Region

“…It is critical to control the increase of temperature, as heating of pulp tissue even for 5.5 °C was reported to cause irreversible damage . Other problems caused by higher temperature of polymerization are the microleakage, staining, and poor marginal sealing, that could short the life of the restorative materials in the mouth . In our work, temperature rise in RENPs doped dental adhesive material under veneer was monitored upon photopolymerization with blue (≈480 nm) light.…”

“…[10] Other problems caused by higher temperature of polymerization are the microleakage, staining, and poor marginal sealing, that could short the life of the restorative materials in the mouth. [11] In our work, temperature rise in RENPs doped dental adhesive material under veneer was monitored upon photopolymerization with blue (≈480 nm) light. Furthermore, NIR emission of RENPs was used for imaging of adhesive distribution under the veneer, performed with SWIR camera.…”

Customized composite veneers from a totally digital workflow: A case report

“…For the front teeth, direct aesthetic restoration, requiring minimal preparation of the tooth, is a widely used therapy, is easily applicable, and is affordable. However, these types of restorations are more subject to wear, microinfiltration, and fractures, and, in some clinical situations, the indirect technique with composite veneers is an excellent treatment option to counter those phenomena thanks to their greater resistance 2‐4 . Composite veneers can also be considered a valid therapeutic alternative for treatment of front teeth aesthetic abnormalities, as well as those in ceramic material 5,6 due to the improved properties of the materials.…”