A quantitative study of enamel acid etch patterns on surfaces used for retention of resin-bonded fixed prostheses.
This study investigated the quality of in vivo etch patterns on the bonding surfaces of 46 abutment teeth following acid etching with 37% phosphoric acid for 30 seconds. Two-stage putty and light bodied addition cured silicone impressions of the etched lingual surfaces were used to form replicas that were then viewed using the scanning electron microscope. Over 69% of the lingual bonding surface area of incisors, canine and premolars were unetched, 16% barely etched, 7% etched and less than 2% ideally etched. There was no significant difference in the quality of etch between different tooth types. There was a significantly greater proportion of poorly etched enamel towards the cervical margin in comparison with the occlusal half. This may have implications in retention of resin bonded bridges.
Hobson
R S
RS
School of Dental Sciences, Newcastle upon Tyne, UK. R.S.Hobson@ncl.ac.uk
Crotty
T
T
Thomason
J M
JM
Jepson
N J A
NJ
D000134:Acid Etching, Dental / Q000379:methods*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D000044:Dental Abutments; D003743:Dental Enamel / Q000187:drug effects*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010756:Phosphoric Acids / Q000008:administration & dosage
D010756:Phosphoric Acids; C030242:phosphoric acid