ABSTRACT
This investigation evaluated the effect of laser etching and acid etching techniques on the marginal leakage Vitadur N porcelain laminate veneers bonded either entirely on enamel, or with cervical margin located on root dentine of prepared extracted maxillary central incisors. Two different composite resin luting systems (light cured, or light and chemical cured) were used and compared. The bonded specimens were thermocycled and by employing the Standard dye penetration technique the leakage was scored from cervical and incisal margins. The least marginal leakage was observed beneath laminate veneers bonded entirely on enamel. Laser etching improved the sealing qualities of veneers with cervical margins on root dentine below the CEJ. Statistically insignificant differences were observed with the use of the two different composite resin luting systems.
Subject(s)
Acid Etching, Dental/methods , Aluminum Oxide/radiation effects , Dental Enamel/radiation effects , Dental Leakage/etiology , Dental Marginal Adaptation , Dental Porcelain/radiation effects , Dental Veneers , Dentin/radiation effects , Laser Therapy , Composite Resins/radiation effects , Dental Leakage/diagnosis , Humans , In Vitro Techniques , Incisor , Maxilla , Tooth Cervix/radiation effectsABSTRACT
In this study, thirty extracted maxillary incisors of comparable sizes were used. The teeth were prepared to receive resin-bonded retainers. Each retainer was constructed with a ring on the palatal surface for bond strength testing. The specimens were divided into two groups. The enamel of the palatal surface of each tooth in the first group was etched using the acid gel etching technique. Laser etching was used in the second group. The etched cast metal retainers of both groups were bonded to the corresponding etched teeth using Nimetic-Grip luting composite. The bonding strength was tested using Instron Testing Machine. From this study, the following conclusions were reached: 1. The results of this study proved that, laser was a successful tool for etching of the enamel surfaces. 2. Comparable results of laser etching and acid etching of the enamel were obtained, as they both gave a satisfactory bond strength to the resin-bonded retainers.
Subject(s)
Acid Etching, Dental/methods , Composite Resins/chemistry , Laser Therapy , Orthodontic Retainers , Resin Cements/chemistry , Acid Etching, Dental/statistics & numerical data , Analysis of Variance , Dental Bonding , Dental Impression Technique , Dental Stress Analysis , Humans , In Vitro Techniques , Incisor , MaxillaABSTRACT
Dental porcelains are the materials from which the most esthetic and hygienic restorations are made. The high esthetic quality of porcelain restoration is attributed to its surface texture, which is characterized by reflection and absorption of light rays(1). Another advantage of porcelain restorations is their tissue biocompatibility of all the available restorative materials, the gingiva responds best to restorations made of porcelain(2). This is explained by the ability of porcelain to attain a smooth polished surface(3). Restorations with a smooth surface greatly impede the accumulation of plaque and thus reduce the incidence of gingival inflammation(4,5).
