Biomaterial Database

Iatrogenic tooth abrasion comparisons among composite materials and finishing techniques. 2002

Christina A Mitchell, and Maria R Pintado, and William H Douglas

The Oral Healthcare Research Centre, School of Clinical Dentistry, Queen's University, Royal Victoria Hospital, Belfast, United Kingdom. c.mitchell@qub.ac.uk

BACKGROUND Many different rotary instruments are available for shaping composite restorations. Whether use of these instruments causes undesirable iatrogenic abrasion of either the tooth surface or the composite restorative material is unknown. Assuming that damage occurs, which technique is least damaging is unknown. OBJECTIVE This in vitro study quantified the loss of surface enamel and dentin surrounding Class V preparations during composite shaping and finishing procedures. The susceptibility of 2 types of composites to tooth abrasion was also examined. METHODS Standardized Class V cavities were prepared at the amelodentinal junction of 36 human molar teeth. The teeth were randomly assigned to 6 groups of 6 teeth each. They were restored with either a low- or high-viscosity composite (Revolution or Prodigy Condensable, respectively) and finished with aluminum oxide disks, tungsten carbide burs, or ultrafine finishing diamond burs. The preparations were profiled before and after restoration. After each finishing procedure, morphological measurements of surface changes in the dentin and enamel were made and reported as volume (in cubic millimeters); maximum depth, mean maximum depth, and mean depth (in micrometers); and surface area (in square millimeters). The results were subjected to a 2-way analysis of variance for restorative material and finishing technique (P<.05). RESULTS Aluminum oxide disks removed significantly less enamel than tungsten carbide burs or ultrafine finishing diamond burs, as measured by volume, maximum depth, mean maximum depth, mean depth, and surface area (P<.05). Conversely, aluminum oxide disks removed significantly greater dentin than either tungsten carbide burs or ultrafine finishing burs as measured by loss of volume, mean depth, and surface area (P<.05). There was no significant difference in the loss of surrounding tooth substance based on resin type (low or high viscosity). CONCLUSIONS Within the limitations of this study, the 3 finishing systems tested resulted in varying degrees of iatrogenic abrasion of enamel and dentin. The composite material used had no significant effect on abrasion of the surrounding enamel or dentin.

UI	MeSH Term	Description	Entries
D007049	Iatrogenic Disease	Any adverse condition in a patient occurring as the result of treatment by a physician, surgeon, or other health professional, especially infections acquired by a patient during the course of treatment.	Hospital-Acquired Condition,Condition, Hospital-Acquired,Conditions, Hospital-Acquired,Disease, Iatrogenic,Diseases, Iatrogenic,Hospital Acquired Condition,Hospital-Acquired Conditions,Iatrogenic Diseases
D008963	Molar	The most posterior teeth on either side of the jaw, totaling eight in the deciduous dentition (2 on each side, upper and lower), and usually 12 in the permanent dentition (three on each side, upper and lower). They are grinding teeth, having large crowns and broad chewing surfaces. (Jablonski, Dictionary of Dentistry, 1992, p821)	Molars
D011897	Random Allocation	A process involving chance used in therapeutic trials or other research endeavor for allocating experimental subjects, human or animal, between treatment and control groups, or among treatment groups. It may also apply to experiments on inanimate objects.	Randomization,Allocation, Random
D003188	Composite Resins	Synthetic resins, containing an inert filler, that are widely used in dentistry.	Composite Resin,Resin, Composite,Resins, Composite
D003755	Dental High-Speed Technique	Dental methods involving the use of DENTAL HIGH-SPEED EQUIPMENT.	Dental High-Speed Technic,Dental High-Speed Technics,Dental High-Speed Techniques,Dental Technic, High-Speed,Dental Technics, High-Speed,Dental Technique, High-Speed,Dental Techniques, High-Speed,High-Speed Dental Technic,High-Speed Dental Technics,High-Speed Dental Technique,High-Speed Dental Techniques,High-Speed Technic, Dental,High-Speed Technics, Dental,High-Speed Technique, Dental,High-Speed Techniques, Dental,Technic, Dental High-Speed,Technic, High-Speed Dental,Technics, Dental High-Speed,Technics, High-Speed Dental,Technique, Dental High-Speed,Technique, High-Speed Dental,Techniques, Dental High-Speed,Techniques, High-Speed Dental,Dental High Speed Technic,Dental High Speed Technics,Dental High Speed Technique,Dental High Speed Techniques,Dental Technic, High Speed,Dental Technics, High Speed,Dental Technique, High Speed,Dental Techniques, High Speed,High Speed Dental Technic,High Speed Dental Technics,High Speed Dental Technique,High Speed Dental Techniques,High Speed Technic, Dental,High Speed Technics, Dental,High Speed Technique, Dental,High Speed Techniques, Dental,Technic, Dental High Speed,Technic, High Speed Dental,Technics, Dental High Speed,Technics, High Speed Dental,Technique, Dental High Speed,Technique, High Speed Dental,Techniques, Dental High Speed,Techniques, High Speed Dental
D003775	Dental Polishing	Creation of a smooth and glossy surface finish on a denture or amalgam.	Dental Burnishing,Dental Finishing,Burnishing, Dental,Finishing, Dental,Polishing, Dental
D003793	Dental Restoration, Permanent	A restoration designed to remain in service for not less than 20 to 30 years, usually made of gold casting, cohesive gold, or amalgam. (Jablonski, Dictionary of Dentistry, 1992)	Dental Fillings, Permanent,Dental Filling, Permanent,Dental Permanent Filling,Dental Permanent Fillings,Dental Restorations, Permanent,Filling, Dental Permanent,Filling, Permanent Dental,Fillings, Dental Permanent,Fillings, Permanent Dental,Permanent Dental Filling,Permanent Dental Fillings,Permanent Dental Restoration,Permanent Dental Restorations,Permanent Filling, Dental,Permanent Fillings, Dental,Restoration, Permanent Dental,Restorations, Permanent Dental
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000537	Aluminum Oxide	An oxide of aluminum, occurring in nature as various minerals such as bauxite, corundum, etc. It is used as an adsorbent, desiccating agent, and catalyst, and in the manufacture of dental cements and refractories.	Alumina,Alumina Ceramic,Aluminum Oxide (Al130O40),Aluminum Oxide (Al2O),Aluminum Oxide (AlO2),Bauxite,Corundum,Sapphire,Ceramic, Alumina,Oxide, Aluminum
D000704	Analysis of Variance	A statistical technique that isolates and assesses the contributions of categorical independent variables to variation in the mean of a continuous dependent variable.	ANOVA,Analysis, Variance,Variance Analysis,Analyses, Variance,Variance Analyses