The Effect of Crown-to-Implant Ratio on the Clinical Outcomes of Dental Implants: A Systematic Review

[fusion_builder_container gradient_top_color=”” gradient_bottom_color=”” gradient_type=”vertical” gradient_direction=”0deg” gradient_force=”yes” hundred_percent=”no” hundred_percent_height=”no” hundred_percent_height_scroll=”no” hundred_percent_height_center_content=”yes” equal_height_columns=”no” menu_anchor=”” hide_on_mobile=”small-visibility,medium-visibility,large-visibility” status=”published” publish_date=”” class=”” id=”” background_color=”” background_image=”” background_position=”center center” background_repeat=”no-repeat” fade=”no” background_parallax=”none” enable_mobile=”no” parallax_speed=”0.3″ video_mp4=”” video_webm=”” video_ogv=”” video_url=”” video_aspect_ratio=”16:9″ video_loop=”yes” video_mute=”yes” video_preview_image=”” border_color=”” border_style=”solid” margin_top=”” margin_bottom=”” padding_top=”” padding_right=”” padding_bottom=”” padding_left=”” type=”legacy”][fusion_builder_row][fusion_builder_column type=”1_1″ layout=”1_1″ gradient_top_color=”” gradient_bottom_color=”” gradient_type=”vertical” gradient_direction=”0deg” gradient_force=”yes” spacing=”” center_content=”no” link=”” target=”_self” min_height=”” hide_on_mobile=”small-visibility,medium-visibility,large-visibility” class=”” id=”” background_color=”” background_image=”” background_image_id=”” background_position=”left top” background_repeat=”no-repeat” hover_type=”none” border_color=”” border_style=”solid” border_position=”all” border_radius=”” box_shadow=”no” dimension_box_shadow=”” box_shadow_blur=”0″ box_shadow_spread=”0″ box_shadow_color=”” box_shadow_style=”” padding_top=”” padding_right=”” padding_bottom=”” padding_left=”” margin_top=”” margin_bottom=”” animation_type=”” animation_direction=”left” animation_speed=”0.3″ animation_offset=”” last=”true” border_sizes_top=”0″ border_sizes_bottom=”0″ border_sizes_left=”0″ border_sizes_right=”0″ type=”1_1″ first=”true”][fusion_checklist icon=”fa-check-circle fas” iconcolor=”#44526d” circle=”no” circlecolor=”” size=”16px” divider=”” divider_color=”” hide_on_mobile=”small-visibility,medium-visibility,large-visibility” class=”” id=””][fusion_li_item icon=””]Purpose: To analyze the effect of crown-to-implant (C/I) ratio over survival rate, marginal bone loss, and prosthetic complications of dental implants.[/fusion_li_item][fusion_li_item icon=””]Materials and Methods: Electronic (PubMed [MEDLINE], Embase, and Cochrane Central) and manual searches for clinical trials with a minimum follow-up of 1 year were performed. Clinical and anatomical C/I ratios were obtained. Regression models were created to assess for potential correlation between C/I ratio (anatomical and clinical) and survival rate, marginal bone loss, or prosthetic complications. A subgroup analysis of 6-mm implants and a comparison of C/I ratios of > 1.5 vs ≤ 1.5 were also performed. The Newcastle-Ottawa Scale and Cochrane Risk of Bias Tool For Randomized Controlled Trials were used to evaluate the risk of bias.[/fusion_li_item][fusion_li_item icon=””]Results: An overall moderate risk of bias was assessed among the selected articles. Linear regression analysis did not reveal a significant correlation between anatomical C/I ratios and survival rate (P = .905), marginal bone loss (P = .33), or prosthetic complications (P = .67). Similarly, no significant correlation to survival rate and marginal bone loss (P = .42, P = .84) was observed in the articles providing the clinical C/I ratios.[/fusion_li_item][fusion_li_item icon=””]Conclusion: ncreased C/I ratio does not seem to be directly related with increased marginal bone loss and does not represent a biomechanical risk factor for the stability of the prosthesis and for the survival of dental implants.[/fusion_li_item][/fusion_checklist][/fusion_builder_column][/fusion_builder_row][/fusion_builder_container]