The Benefits of Composite Resin in Direct Dental Restorations





By Rebecca Stone October 1, 2018

The advent of adhesive dentistry in the 1950s was a boon to the dental profession. The availability of composite resin formulations, often coupled with bonding agents, enables clinicians to place tooth-colored fillings, which by most esthetic standards, beat the heck out of silver fillings. In addition, their placement is less invasive than that of amalgam, which requires the removal of enough tooth structure to allow mechanical retention.

Composite dental materials are typically based on a resin matrix — such as bisphenol A-glycidyl methacrylate or urethane dimethacrylate — with the addition of inorganic fillers. Fillers may range from silica and glass to ceramics and crystalline quartz. Since their debut on the dental scene, composite products — which may be light-cured, self-curing or both — have featured numerous variations in filler particle densities, shapes and sizes. All of these factors influence material characteristics from esthetics to polymerization shrinkage.

Steady Progression

But nailing down the best characteristics in one formulation has been challenging. For instance, early macrofills featured large filler particles that not only lacked good polishability, but also exhibited a tendency toward “plucking,” or having particles pop out, leaving a rough, pitted surface. Not a therapeutically desirable outcome, and also not a good look for most people.

Subsequently, microfills boasted a low-filler content composed of fine particles. Unfortunately, they lacked the ability to withstand posterior compressive forces, although top-drawer polishability and stain resistance earned them favor in anterior applications.

The Nanohybrid Composite Resin

Nanohybrid composite resin incorporates nanoparticles (usually under 100 nm) of materials such as silica and zirconia — even diamonds — into more conventional fillers. Alternately, nanofilled composites are highly filled with all nanoparticles and nanoclusters of varying sizes and shapes.1Sachdeva S, Kapoor P, Tamrakar AK, Noor R. Nano-composite dental resins: an overview. Ann Dent. 2015;3:52–55. 2Pocket Dentistry. Introduction to Composite Restorations. Available at: https://pocketdentistry.com/8-introduction-to-composite-restorations/. Accessed September 10, 2018.

Bioactivity

Joining today’s product lineup are nanohybrid composites endowed with bioactive properties. These not only are designed to deliver excellent esthetics, but also help protect teeth against caries, and foster remineralization, allowing minimally invasive treatment of early-stage caries. In fact, dental materials endowed with antibacterial properties are currently in the works.3Dental Equipment. New Dental Materials Resists Plaque and Kills Microbes. Available at: http://www.identfoshan.com/index.php?c=article&a=detail&id=20. Accessed September 10, 2018.

Numerous key opinion leaders see such materials that prevent plaque formation and help teeth rebuild themselves as the wave of the future.4Stone R. Hole truths. Mentor. 2017;8(10): 32-34.

There is still disagreement about the precise definition of “bioactive” when it comes to dental materials. Some believe that glass ionomer materials, which release fluoride ions fall into this category. Others contend that in order to earn that classification, a material must precipitate apatite through not just the release of fluoride, but also calcium and phosphate. 5Stone R. Hole truths. Mentor. 2017;8(10): 32-34.

Composite Placement

But after several generations of composite resin materials, there’s little disagreement that when viewed through a broad lens, composite materials, placed with care, offer a wealth of patient-pleasing riches.

Speaking of care, when it comes to adhesive dentistry, following manufacturer directions is key, in addition to isolation and moisture control. In fact, many composite materials can be seriously compromised by exposure to moisture. Of course, dental dams can be of great help in this respect. But comprehensive systems, such as the Isolite 3, furnish not only moisture control and isolation of the field of operation via a comfortable yet transparent mouthpiece, but also continuous suction, illumination and retraction of oral tissues, all while preventing aspiration of dental materials by the patient. It’s almost like having an extra assistant.

Of course, each practitioner must choose the composite resin material that works best in his or her hands. But it’s easy to see that, when viewed through a broad lens, composite materials, placed with care, offer a wealth of patient benefits. Thanks to improved characteristics, they not only blend into natural dentition, but help protect it from the ravages of bacteria and time.

[gravityform id=2 title=false description=false ajax=true tabindex=49]
<div class='gf_browser_unknown gform_wrapper' id='gform_wrapper_2' ><div id='gf_2' class='gform_anchor' tabindex='-1'></div><form method='post' enctype='multipart/form-data' target='gform_ajax_frame_2' id='gform_2' action='/benefits-composite-resin/#gf_2'> <div class='gform_body'><ul id='gform_fields_2' class='gform_fields left_label form_sublabel_below description_below'><li id='field_2_6' class='gfield gravityFormEmail gfield_contains_required field_sublabel_below field_description_below gfield_visibility_visible' ><label class='gfield_label' for='input_2_6' >First Name<span class='gfield_required'>*</span></label><div class='ginput_container ginput_container_text'><input name='input_6' id='input_2_6' type='text' value='' class='large' tabindex='49' aria-required="true" aria-invalid="false" /></div></li><li id='field_2_7' class='gfield gravityFormEmail gfield_contains_required field_sublabel_below field_description_below gfield_visibility_visible' ><label class='gfield_label' for='input_2_7' >Last Name<span class='gfield_required'>*</span></label><div class='ginput_container ginput_container_text'><input name='input_7' id='input_2_7' type='text' value='' class='large' tabindex='50' aria-required="true" aria-invalid="false" /></div></li><li id='field_2_8' class='gfield gravityFormEmail gfield_contains_required field_sublabel_below field_description_below gfield_visibility_visible' ><label class='gfield_label' for='input_2_8' >Practice Name<span class='gfield_required'>*</span></label><div class='ginput_container ginput_container_text'><input name='input_8' id='input_2_8' type='text' value='' class='large' tabindex='51' aria-required="true" aria-invalid="false" /></div></li><li id='field_2_11' class='gfield gravityFormEmail gfield_contains_required field_sublabel_below field_description_below gfield_visibility_visible' ><label class='gfield_label' for='input_2_11' >Phone<span class='gfield_required'>*</span></label><div class='ginput_container ginput_container_phone'><input name='input_11' id='input_2_11' type='text' value='' class='large' tabindex='52' aria-required="true" aria-invalid="false" /></div></li><li id='field_2_1' class='gfield gravityFormEmail gfield_contains_required field_sublabel_below field_description_below gfield_visibility_visible' ><label class='gfield_label' for='input_2_1' >Email address:<span class='gfield_required'>*</span></label><div class='ginput_container ginput_container_email'> <input name='input_1' id='input_2_1' type='text' value='' class='large' tabindex='53' aria-required="true" aria-invalid="false" /> </div></li><li id='field_2_2' class='gfield field_sublabel_below field_description_below gfield_visibility_hidden' ><label class='gfield_label' for='input_2_2' >utm_campaign</label><div class='ginput_container ginput_container_text'><input name='input_2' id='input_2_2' type='text' value='' class='medium' tabindex='54' aria-invalid="false" /></div></li><li id='field_2_3' class='gfield field_sublabel_below field_description_below gfield_visibility_hidden' ><label class='gfield_label' for='input_2_3' >utm_source</label><div class='ginput_container ginput_container_text'><input name='input_3' id='input_2_3' type='text' value='' class='medium' tabindex='55' aria-invalid="false" /></div></li><li id='field_2_4' class='gfield field_sublabel_below field_description_below gfield_visibility_hidden' ><label class='gfield_label' for='input_2_4' >utm_content</label><div class='ginput_container ginput_container_text'><input name='input_4' id='input_2_4' type='text' value='' class='medium' tabindex='56' aria-invalid="false" /></div></li><li id='field_2_5' class='gfield field_sublabel_below field_description_below gfield_visibility_hidden' ><label class='gfield_label' for='input_2_5' >utm_medium</label><div class='ginput_container ginput_container_text'><input name='input_5' id='input_2_5' type='text' value='' class='medium' tabindex='57' aria-invalid="false" /></div></li><li id='field_2_12' class='gfield gform_validation_container field_sublabel_below field_description_below gfield_visibility_visible' ><label class='gfield_label' for='input_2_12' >Name</label><div class='ginput_container'><input name='input_12' id='input_2_12' type='text' value='' /></div><div class='gfield_description' id='gfield_description__12'>This field is for validation purposes and should be left unchanged.</div></li> </ul></div> <div class='gform_footer left_label'> <input type="image" src="https://www.zyris.com/wp-content/uploads/2019/10/submit-button-17.png" id="gform_submit_button_2" class="gform_button gform_image_button om-trigger-conversion" alt="Submit" tabindex="58" onclick='if(window["gf_submitting_2"]){return false;} window["gf_submitting_2"]=true; ' onkeypress='if( event.keyCode == 13 ){ if(window["gf_submitting_2"]){return false;} window["gf_submitting_2"]=true; jQuery("#gform_2").trigger("submit",[true]); }'> <input type='hidden' name='gform_ajax' value='form_id=2&amp;title=&amp;description=&amp;tabindex=49' /> <input type='hidden' class='gform_hidden' name='is_submit_2' value='1' /> <input type='hidden' class='gform_hidden' name='gform_submit' value='2' /> <input type='hidden' class='gform_hidden' name='gform_unique_id' value='' /> <input type='hidden' class='gform_hidden' name='state_2' value='WyJbXSIsImQyMTNiNWE3MmNhZTQ4NWEwYWU2MGI4YjVhZjQ3YThjIl0=' /> <input type='hidden' class='gform_hidden' name='gform_target_page_number_2' id='gform_target_page_number_2' value='0' /> <input type='hidden' class='gform_hidden' name='gform_source_page_number_2' id='gform_source_page_number_2' value='1' /> <input type='hidden' name='gform_field_values' value='' /> </div> </form> </div> <iframe style='display:none;width:0px;height:0px;' src='about:blank' name='gform_ajax_frame_2' id='gform_ajax_frame_2' title='This iframe contains the logic required to handle Ajax powered Gravity Forms.'></iframe> <script type='text/javascript'>jQuery(document).ready(function($){gformInitSpinner( 2, 'https://www.zyris.com/wp-content/plugins/gravityforms/images/spinner.gif' );jQuery('#gform_ajax_frame_2').on('load',function(){var contents = jQuery(this).contents().find('*').html();var is_postback = contents.indexOf('GF_AJAX_POSTBACK') >= 0;if(!is_postback){return;}var form_content = jQuery(this).contents().find('#gform_wrapper_2');var is_confirmation = jQuery(this).contents().find('#gform_confirmation_wrapper_2').length > 0;var is_redirect = contents.indexOf('gformRedirect(){') >= 0;var is_form = form_content.length > 0 && ! is_redirect && ! is_confirmation;var mt = parseInt(jQuery('html').css('margin-top'), 10) + parseInt(jQuery('body').css('margin-top'), 10) + 100;if(is_form){jQuery('#gform_wrapper_2').html(form_content.html());if(form_content.hasClass('gform_validation_error')){jQuery('#gform_wrapper_2').addClass('gform_validation_error');} else {jQuery('#gform_wrapper_2').removeClass('gform_validation_error');}setTimeout( function() { /* delay the scroll by 50 milliseconds to fix a bug in chrome */ jQuery(document).scrollTop(jQuery('#gform_wrapper_2').offset().top - mt); }, 50 );if(window['gformInitDatepicker']) {gformInitDatepicker();}if(window['gformInitPriceFields']) {gformInitPriceFields();}var current_page = jQuery('#gform_source_page_number_2').val();gformInitSpinner( 2, 'https://www.zyris.com/wp-content/plugins/gravityforms/images/spinner.gif' );jQuery(document).trigger('gform_page_loaded', [2, current_page]);window['gf_submitting_2'] = false;}else if(!is_redirect){var confirmation_content = jQuery(this).contents().find('.GF_AJAX_POSTBACK').html();if(!confirmation_content){confirmation_content = contents;}setTimeout(function(){jQuery('#gform_wrapper_2').replaceWith(confirmation_content);jQuery(document).scrollTop(jQuery('#gf_2').offset().top - mt);jQuery(document).trigger('gform_confirmation_loaded', [2]);window['gf_submitting_2'] = false;}, 50);}else{jQuery('#gform_2').append(contents);if(window['gformRedirect']) {gformRedirect();}}jQuery(document).trigger('gform_post_render', [2, current_page]);} );} );</script><script type='text/javascript'> jQuery(document).bind('gform_post_render', function(event, formId, currentPage){if(formId == 2) {jQuery('#input_2_11').mask('(999) 999-9999').bind('keypress', function(e){if(e.which == 13){jQuery(this).blur();} } );} } );jQuery(document).bind('gform_post_conditional_logic', function(event, formId, fields, isInit){} );</script><script type='text/javascript'> jQuery(document).ready(function(){jQuery(document).trigger('gform_post_render', [2, 1]) } ); </script>
[if lte IE 8]
[if lte IE 8]