{'fraction_non_alphanumeric': 0.023351648351648352, 'fraction_numerical': 0.006868131868131868, 'mean_word_length': 5.714285714285714, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Surface texture of modified Polyetheretherketone Compared to Lithium Disilicate Crowns in Anterior Aesthetic Zone (Randomized Controlled Clinical Trial)

Background: Crown surface texture affect final esthetic outcome upon restoring single anterior tooth which poses the greatest esthetic challenge for the clinician. Objectives: The aim was to compare surface texture of modified polyetheretherketone (PEEK) polymer and lithium disilicateceramic crowns in anterior esthetic zone with follow up one year. Materials and Method: Twenty-four Patients were divided randomly into two groups (group=12), each patient received either modified PEEK or lithium disilicate crown. Both materials were fabricated according to the manufacturer’s instructions. Surface texture was evaluated at cementation time and after 3, 6, 9 and 12 months follow up periods by five blinded assessors to ass surface texture change using modified United State of Public Health and Service (USPHS) scores. Results: Chi-square test was used to compare between different tested Groups. There was no statistically significant difference among time between the two groups (P-value = 1.00) regarding the surface texture of the lithium disilicateceramic and modified PEEK polymer restorations. Conclusion: IPS e.max and modified PEEK crowns revealed excellent surface texture after one year follow up and the modified PEEK polymers can be successfully used in aesthetic anterior restorations.