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Abstract: Objective: To compare the cuspal strain in Class II restorations made with bulk‐fill and conventional composite resins. Materials and methods: Fifty extracted maxillary premolars were mounted into phenolic rings and divided into five groups (n = 10). Specimens received standardized MOD preparations. A two‐step self‐etch adhesive was applied and the preparations were restored using a custom matrix as follows: Filtek Supreme Ultra in eight 2‐mm increments (FSUI); Filtek Supreme Ultra in bulk (FSUB); SonicFill in bulk (SF); SureFil SDR flow in bulk, covered with a 2‐mm occlusal layer of Filtek Supreme Ultra (SDR/FSU); Tetric EvoCeram Bulk Fill in bulk (TEBF). Strain gages bonded to the buccal and lingual cusps recorded cuspal strain during restorations. End strain values were determined and data were subjected to Kruskal‐Wallis testing, followed by one‐way ANOVA and Tukey´s post hoc test. Results: Combined strain values and standard deviations (in µɛ) were: FSUI: 723 ± 102.8, FSUB: 929.2 ± 571.9, SF: 519.1 ± 80.2, SDR‐FSU: 497.4 ± 67.6 and TEBF: 604.5 ± 127.1. A significant difference was found between group FSUI and groups SF, SDR‐FSU, and TEBF. Group FSUB showed significantly higher mean strain and greater standard deviation than all other groups due to cuspal fractures, and was thus excluded from the statistical analysis. Conclusions: The tested bulk‐fill composite resins exerted less strain onto tooth structure than the incrementally placed conventional composite resin, although the magnitude of generated strain was product‐dependent. Bulk‐filling with conventional composite resins is contraindicated. Clinical significance: Bulk‐fill composite resins exerted less strain onto adjacent tooth structure than a traditional composite, even when that composite is was placed incrementally. Bulk‐filling with traditional composite resins is unpredictable and contraindicated. [ABSTRACT FROM AUTHOR]

The author discusses the result of a study which evaluates the vertical positions of anterior teeth on smile esthetics determined by the Japanese and Korean orthodontists and orthodontic patients. The author states that the anterior teeth's vertical positions were assessed after digital modification in 1-millimeter (mm) increments, from 5mm upper lip coverage to 5mm gingival exposure. He notes that orthodontists and the female patients shared the same preference in the smile evaluation.

The article presents the author's views on a case report concerning anterior crossbite correction of a 28-year-old Korean female using orthodontic clear aligner. In the case report, the authors have mentioned esthetics, quickness, comfort, low cost and availability to change plans during treatment as some of the advantages of clear aligner. According to the author, the clear aligner is an effective alternative for patients who are reluctant to wear fixed appliances.