This study aims to demonstrate the histological differences in the connective tissue surrounding laser-treated abutments and untreated abutments in humans.

Working hypothesis: There are differences in the adhesion of collagen fibres around implant abutments with laser-produced microgrooves and standard abutments.

All patients will receive both abutment systems. The assignment of the abutments to each of the implants will be made randomly using SPSS 15.0 (SPSS Inc., Chicago, Il, United States) software.

Inclusion Criteria:

• patient must have partial edentulism of at least 2 teeth
• patients that have scheduled treatment for the placement of at least 2 implants
• patients with favourable attached gingiva
• patients without systemic diseases that would prevent the emplacement of implants
• patient must accept participation in the study by signing an informed consent form

Exclusion Criteria:

• smokers of 1 or more cigarettes per day
• patients who suffer from any known condition that could be an absolute or relative contraindication to dental implant placement
• patients requiring any additional surgical technique for bone or gum graft in order to insert the dental implant
• patients who refuse to be included in the study or do not sign the informed consent form