A randomized controlled 30 years follow up of three conventional resin composites in Class II restorations.

Research output: Contribution to journalJournal articleResearchpeer-review

Ulla Pallesen, Jan WV van Dijken

Objective.
The aim of this 30 year randomized controlled study was to evaluate, by intrain-dividual comparisons, the durability of three conventional resin composites in Class IIrestorations.
Methods.
Each of 30 participants, 21 female and 9 male (mean age 30 years, range 20–43),received at least three (one set) as similar as possible Class II restorations of moderate size.After cavity preparation, the three cavities were chosen at random to be restored with twochemical-cured (P10, Miradapt) and one light-cured resin composite (P30). A chemical-curedenamel bonding agent was applied after etching of the enamel. The chemical-cured resincomposites were placed in bulk and the light-cured in increments. One operator placed 99restorations (33 sets). The restorations were evaluated with slightly modified USPHS crite-ria at baseline, 2, 3, 5, 10, 15, 20 and 30 years. Statistical analyses were performed by theKaplan–Meier, log-rank test and Cox regression analyses.
Results.
After 30 years, 5 participants with 15 restorations (15%) could not be evaluated duringthe whole evaluation. Seven participants were considered as caries risk and eight partici-pants as having active parafunctional habits. Postoperative sensitivity was observed in 24teeth. In total 28 restorations, 9 P10, 12 P30 and 7 Miradapt restorations failed during the 30 years. The main reasons for failure were secondary caries (39.2%) and material fracture(35.7%). Sixty-four percent of the secondary caries lesions were found in high caries riskparticipants and 70% of the material fractures occurred in participants with active para-functional habits. The overall success rate at 30 years was 63%, with an annual failure rateof 1.1%. 68–81% of the restorations showed non-acceptable color match. No statistical sig-nificant difference in survival rate was found between the three resin composites (p = 0.45).The variables tooth type, cavity size, age, and gender of the participants did not significantlyaffect the probability of failure.
Significance.
The three conventional resin composites showed good clinical performance dur-ing the 30 year evaluation. The chemical cured resin composites showed better performancethan the light-cured composite.
Original languageEnglish
JournalDental Materials
Volume31
Issue number10
Pages (from-to)1232-1244
Number of pages13
DOIs
Publication statusPublished - 2015

ID: 142268059