Objectives: Etching of ceramic surfaces with hydrofluoric acid had proven to result in high bond strengths with composite resin. However, its intraoral use is discussed controversially. Therefore, different non-acid treatments of ceramic surfaces were evaluated for suitability of intraoral porcelain repair.

Methods: Leucite-reinforced glass ceramic (Cerana^TM, LR) inserts and Beta-Quartz^TM ceramic (BQ) inserts were ground at their end wall with a diamond bur, and then assigned to four LR ceramic groups (n=20) and four BQ ceramic groups (n=20): (1) control group: no further treatment; (2) special repair kit: grinding with a silicon carbide stone and treatment with Cimara^TM - silane; (3) treatment with the silane E-500 Primer &Activator^TM, and (4) treatment with methacryloxypropyl-trimetoxysilane (Monobond^TM). After the different pretreatments of the ground surfaces, each two inserts were sticked together in a special device to ensure an axial fixation. In all cases a dual-curing hybrid composite (Variolink ultra^TM) was used. After 14 days storage in aqua dest., the samples were thermocycled (5000x, 5°-55°C), and tensile bond strength was measured in an universal testing machine.

Results: Bond strengths [Mpa] were determined for LR , and for BQ, respectively: 7.48 (± 4.50) and 4.74 (± 1.46) in the control group (diamond bur); 17.57 (± 5.19) and 7.27 (± 1.30) in group 2; 26.38 (± 5.03) and 15.82 (± 4.29) in group 3, and 30.08 (± 8.73) and 20.83 (± 3.34) in group 4. Bonding to LR ceramic resulted in significantly higher values than to BQ ceramic (p<0.05). Pairwise comparison showed significant differences for all groups, except for the LR ceramic between group 3 and group 4.

Conclusions: The results indicated that the use of methacryloxypropyl-trimetoxysilane represents a suitable treatment for intraoral repair of glass ceramic.

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