Study of masking ability of laminate veneers for discolored teeth / 北京大学学报(医学版)

OBJECTIVE@#To select the most effective method among different masking treatments, such as different thickness and transparence, tissue surface's opaque coating, and opaque resin cement to restore discolored teeth esthetically by porcelain veneer.@*METHODS@#Four extracted intact maxillary central incisors were prepared for porcelain veneer restoration and each three heat pressed porcelain veneers from three thicknesses (0.8 mm, 1.0 mm, 1.2 mm) and two transparency(high transparence, HT and low transparence, LT))in Vita shade A2 were fabricated for each tooth, in total of 72 pieces. The surfaces of three prepared teeth were then painted to mimic situations of severe dental fluorosis, severe tetracycline teeth, and necrotic teeth. Each of the veneers was temporarily cemented to the corresponding tooth surface using try-in cements with three different colors (transparent, opaque, and yellow), then used the shade guide (3D master) and electronic colorimeter (easy shade) to record the shade of each porcelain veneer through hue, lightness, and chroma reading. After that, high-transparence porcelain veneers in thickness of 0.8 mm was fused with a layer of opaque porcelain in tissue surface, and were shade matched again after cementation. Statistic treatments were performed to analyze the difference in each masking method.@*RESULTS@#For each 0.2 mm increase in the veneer thickness of porcelain, the average lightness was reduced by 1 unit, while the chroma was not changed which was independent of the type of the resin cements. When the thickness of the porcelain veneer was decreased to 0.8 mm, the opacity effect was not remarkable even if a low-transparence porcelain veneer was used. Transparent and yellow resin cements had poor opaque performance, while opaque resin cement could reduce the lightness by 2 units and the chroma was also reduced. The opaque layer of the tissue surface could be applied uniformly, and the lightness and chroma could be reduced to Vita 2M1 to 2M1.5 levels regardless of the color of resin cements, which suggested a stable opacity effect for different discolored teeth in this study.@*CONCLUSION@#For porcelain veneer restoration of discolored teeth, thickened veneers are the most effective means to display a natural transmittance and color. Tissue surface's opacity coatings and opaque resin cements can also be used to reduce grayscale and increase lightness.

Clinical comparative study between resin restoration and porcelain veneers in the treatment of anterior teeth gap / 中国生化药物杂志

Objective To investigate the clinical effect of resin restoration and porcelain veneer in the treatment of anterior teeth gap, in order to improve the level of clinical treatment.Methods120 cases of anterior teeth gap patients from June 2015 to December 2016 were divided into two groups, the control group was treated with resin restoration, the observation group was treated with porcelain veneers, the effect of the two groups was compared.ResultsThere was no significant difference in recovery body integrity and color satisfaction between the two groups at three months after operation;While the edge suitability satisfaction rate of patients in the observation group was 100.0%, postoperative sensitivity satisfaction rate was 98.3%,gingival inflammation satisfaction rate was 100.0%, which was significantly higher than that of the control group(90.0%, 83.3%, 86.6%), the difference between the two groups were statistically significant (P<0.05);After 12 months later,the recovery body integrity satisfaction rate in the observation group was 100.0%, 90.0% in the control group, the color satisfaction was 100.0% in the observation group and 90.0% in the control group, and the difference was statistically significant (P<0.05), There was no significant difference between the two groups were at the edge of the suitability of satisfaction, satisfaction rate of postoperative sensitivity, gingival inflammation satisfaction rate.ConclusionThe porcelain veneer teeth gap before significant clinical effect, but to make individual tooth preparation.

Use of Feldspathic Porcelain Veneers to Improve Smile Harmony: A 3-Year Follow-up Report

Abstract This case report describes an esthetic treatment to improve the shape and alignment of the anterior teeth, reestablishing smile harmony, using feldspathic porcelain veneers. Results of clinical follow up after 36 months are also presented. The advantages, disadvantages and limitations of the technique are detailed with reference to the relevant literature. This suggests that the success of treatment depends on adequate conditions of bonding between the veneers and the tooth complex, which involves parameters such as the strength and durability of the bond interface. Therefore, the clinical success of feldspathic porcelain veneers depends on the accurate selection of cases and correct execution of clinical and laboratory procedures. The rehabilitation involved from first right premolar to the left with feldspathic porcelain veneers made on refractory dies. After the 3-year follow up, excellent clinical results and patient satisfaction were achieved.

Resumo Este relato de caso descreve um tratamento estético para melhorar a forma e alinhamento dos dentes anteriores, restabelecendo a harmonia do sorriso por meio de laminados de porcelana feldspática. Resultados de acompanhamento clínico longitudinal de 36 meses também são apresentados. As vantagens, desvantagens e limitações da técnica são detalhadas com referência na literatura. Isto sugere que o sucesso do tratamento depende de adequadas condições de união entre o laminado e o complexo dental, o qual envolve parâmetros tais como resistência e durabilidade na interface de união. Assim, o sucesso clínico de laminados de porcelana feldspática depende de uma precisa seleção do caso e correta execução dos procedimentos clínicos e laboratoriais. A reabilitação envolveu de primeiro pré-molar direito a esquerdo com laminado de porcelana feldspática confeccionada em matriz refratária. Após 3 anos de acompanhamento, excelentes resultados clínicos e satisfação do paciente foram verificados.